HP Hewlett Packard Remote Starter 18 26 User Manual

OWNER'S MANUAL  
COMMAND 18-26 HP  
HORIZONTAL CRANKSHAFT  
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Safety Precautions (Cont.)  
WARNING  
WARNING  
WARNING  
Explosive Gas can cause fires and  
severe acid burns.  
Accidental Starts can cause  
severe injury or death.  
Carbon Monoxide can cause  
severe nausea, fainting or death.  
Charge battery only in a well  
ventilated area. Keep sources of  
ignition away.  
Disconnect and ground spark plug  
leads before servicing.  
Do not operate engine in closed or  
confined area.  
Accidental Starts!  
Lethal Exhaust Gases!  
Explosive Gas!  
Disabling engine. Accidental  
starting can cause severe injury or poisonous carbon monoxide.  
death. Before working on the engine Carbon monoxide is odorless,  
or equipment, disable the engine as  
follows: 1) Disconnect the spark  
plug lead(s). 2) Disconnect negative  
(-) battery cable from battery.  
Engine exhaust gases contain  
Batteries produce explosive  
hydrogen gas while being charged.  
To prevent a fire or explosion,  
charge batteries only in well  
ventilated areas. Keep sparks, open  
flames, and other sources of  
ignition away from the battery at all  
times. Keep batteries out of the  
reach of children. Remove all  
jewelry when servicing batteries.  
colorless, and can cause death if  
inhaled. Avoid inhaling exhaust  
fumes, and never run the engine in  
a closed building or confined area.  
Before disconnecting the negative  
(–) ground cable, make sure all  
switches are OFF. If ON, a spark  
will occur at the ground cable  
terminal which could cause an  
explosion if hydrogen gas or  
gasoline vapors are present.  
Congratulations – You have selected a fine four-cycle, twin cylinder, air-cooled engine. Kohler designs long life  
strength and on-the-job durability into each engine...making a Kohler engine dependable...dependability you can  
count on. Here are some reasons why:  
• Efficient overhead valve design and full pressure lubrication provide maximum power, torque, and reliability  
under all operating conditions.  
• Dependable, maintenance free electronic ignition ensures fast, easy starts time after time.  
• Kohler engines are easy to service. All routine service areas like the dipstick, oil fill, air cleaner, and spark  
plugs are easily and quickly accessible.  
• Parts subject to the most wear and tear (like the cylinder liner* and camshaft) are made from precision  
formulated cast iron. Because the cylinder liner* can be rebored, these engines can last even longer.  
*CH25/26 engines have POWER-BORE™ Cylinders. These cylinders are plated with nickel-silicon to give  
increased power, virtually permanent cylinder life, superior oil control, and reduced exhaust emissions. These  
cylinders cannot be rebored.  
• Every Kohler engine is backed by a worldwide network of over 10,000 distributors and dealers. Service  
support is just a phone call away. Call 1-800-544-2444 (U.S. & Canada) for Sales & Service assistance.  
To keep your engine in top operating condition, follow the maintenance procedures in this manual.  
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Air Cleaner  
Dipstick  
Oil Fill  
Fuel  
Pump  
Oil Filter  
Oil Cooler  
Electric  
Starter  
Rectifier-Regulator  
Side Oil Drain Plugs  
Figure 1. Typical Command Horizontal Shaft Engine (CH18-25).  
Throttle Body Intake Manifold  
Ignition Coil  
Fuel Injectors  
Ignition Coil  
Oil Filter  
Oil Cooler  
Rectifier-Regulator  
Figure 2. CH26 Command Horizontal Shaft Engine.  
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Oil Recommendations  
Fuel Recommendations  
Using the proper type and weight of oil in the crankcase  
is extremely important. So is checking oil daily and  
changing oil regularly. Failure to use the correct oil, or  
using dirty oil, causes premature engine wear and  
failure.  
WARNING: Explosive Fuel!  
Gasoline is extremely flammable and its vapors can  
explode if ignited. Store gasoline only in approved  
containers, in well ventilated, unoccupied buildings, away  
from sparks or flames. Do not fill the fuel tank while the  
engine is hot or running, since spilled fuel could ignite if  
it comes in contact with hot parts or sparks from  
ignition. Do not start the engine near spilled fuel. Never  
use gasoline as a cleaning agent.  
Oil Type  
Use high quality detergent oil of API (American  
Petroleum Institute) service class SG, SH, SJ or  
higher. Select the viscosity based on the air  
temperature at the time of operation as shown in the  
following table.  
General Recommendations  
Purchase gasoline in small quantities and store in clean,  
approved containers. A container with a capacity of 2  
gallons or less with a pouring spout is recommended.  
Such a container is easier to handle and helps eliminate  
spillage during refueling.  
**  
*
Do not use gasoline left over from the previous season,  
to minimize gum deposits in fuel system and to insure  
easy starting.  
Do not add oil to the gasoline.  
*Use of synthetic oil having 5W-20 or 5W-30 rating is  
acceptable, up to 40°F.  
**Synthetic oils will provide better starting in extreme  
cold (below -10°F).  
Do not overfill the fuel tank. Leave room for the fuel to  
expand.  
Figure 3. Viscosity Grades Table.  
Fuel Type  
For best results use only clean, fresh, unleaded  
gasoline with a pump sticker octane rating of 87 or  
higher. In countries using the Research method, it  
should be 90 octane minimum.  
NOTE: Using other than service class SG, SH, SJ or  
higher oil or extending oil change intervals  
longer than recommended can cause engine  
damage.  
Unleaded gasoline is recommended as it leaves less  
combustion chamber deposits and reduces harmful  
exhaust emissions. Leaded gasoline is not  
A logo or symbol on oil containers identifies the API  
service class and SAE viscosity grade. See Figure 4.  
recommended and must not be used on CH26 engines.  
Gasoline/Alcohol blends  
Gasohol (up to 10% ethyl alcohol, 90% unleaded  
gasoline by volume) is approved as a fuel for Kohler  
engines. Other gasoline/alcohol blends are not approved.  
Gasoline/Ether blends  
Methyl Tertiary Butyl Ether (MTBE) and unleaded  
gasoline blends (up to a maximum of 15% MTBE by  
volume) are approved as a fuel for Kohler engines. Other  
gasoline/ether blends are not approved.  
Figure 4. Oil Container Logo.  
Refer to “Maintenance Instructions” beginning on  
page 8 for detailed oil check, oil change, and oil  
filter change procedures.  
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Engine Identification Numbers  
Operating Instructions  
Also read the operating instructions of the equipment  
this engine powers.  
When ordering parts, or in any communication involving  
an engine, always give the Model, Specification, and  
Serial Numbers of the engine.  
Pre-Start Checklist  
• Check oil level. Add oil if low. Do not overfill.  
The engine identification numbers appear on a decal (or  
decals) affixed to the engine shrouding. Include letter  
suffixes, if there are any.  
• Check fuel level. Add fuel if low.  
Record your engine identification numbers on the  
identification label below (Figure 5) for future reference.  
• Check cooling air intake areas and external  
surfaces of engine. Make sure they are clean and  
unobstructed.  
MODEL NO.  
SPEC. NO.  
DISPL (CC)  
• Check that the air cleaner components and all  
shrouds, equipment covers, and guards are in  
place and securely fastened.  
SERIAL NO.  
REFER TO OWNER'S MANUAL FOR  
SAFETY, MAINTENANCE SPECS AND  
ADJUSTMENTS. FOR SALES AND  
SERVICE IN US/CANADA CALL:  
1-800-544-2444  
• Check that any clutches or transmissions are  
disengaged or placed in neutral. This is especially  
important on equipment with hydrostatic drive. The  
shift lever must be exactly in neutral to prevent  
resistance which could keep the engine from  
starting.  
KOHLER CO. KOHLER, WI USA  
WARNING: Lethal Exhaust Gases!  
Engine exhaust gases contain poisonous carbon  
monoxide. Carbon monoxide is odorless, colorless,  
and can cause death if inhaled. Avoid inhaling exhaust  
fumes, and never run the engine in a closed building  
or confined area.  
IMPORTANT ENGINE INFORMATION  
THIS ENGINE MEETS U.S. EPA  
PHASE 1 AND 1995-1999  
CALIFORNIA EMISSION CONTROL  
REGULATIONS FOR SORE*  
FAMILY  
MODEL NO.  
SPEC. NO.  
Cold Weather Starting Hints  
1. Be sure to use the proper oil for the temperature  
expected. See Figure 3 on page 5.  
DISPL (CC)  
SERIAL NO.  
REFER TO OWNER'S MANUAL FOR  
SAFETY, MAINTENANCE SPECS AND  
ADJUSTMENTS. FOR SALES AND  
SERVICE IN US/CANADA CALL:  
1-800-544-2444  
2. Disengage all possible external loads.  
3. Set speed control at part throttle position.  
4. Be sure the battery is in good condition. A warm  
battery has much more starting capacity than a  
cold battery.  
KOHLER CO. KOHLER, WI USA  
5. Use fresh winter grade fuel. NOTE: Winter grade  
gasoline has a higher volatility to improve starting.  
Do not use gasoline left over from summer.  
If your engine has this identification label, it is  
certified to meet EPA/CARB standards.  
*Small Off-Road Engines  
Figure 5. Engine Identification Labels.  
Starting  
CH18-26 Engines:  
1. Place the throttle control midway between the  
‘‘slow’’ and ‘‘fast’’ positions. Place the choke  
control (CH18-25 engines only) into the ‘‘on’’  
position. See Figure 6.  
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4. For a Warm Engine – Return choke to “off”  
position as soon as engine starts.  
Stopping  
1. Remove the load by disengaging all PTO driven  
Choke  
Control  
Throttle  
Control  
attachments.  
2. For CH18-25 Engines Without A Shutdown  
Solenoid: Move the throttle to the “slow” or  
“low” idle position. Allow the engine to run at idle  
for 30-60 seconds; then stop the engine.  
Figure 6. Optional Engine Mounted Throttle and  
Choke Controls (CH18-25).  
2. Start the engine by activating the key switch.  
Release the switch as soon as the engine starts.  
For CH18-25 Engines Equipped With A  
Shutdown Solenoid: Position the throttle control  
somewhere between half and full throttle; then stop  
the engine.  
NOTE: Do not crank the engine continuously for  
more than 10 seconds at a time. If the  
engine does not start, allow a 60 second  
cool down period between starting  
attempts. Failure to follow these  
For CH26 Engines: Turn key ‘‘off’’ to stop  
engine.  
guidelines can burn out, or permanently  
damage, the starter motor.  
Battery  
A 12 volt battery is normally used. Refer to the  
operating instructions of the equipment this engine  
powers for specific battery requirements.  
NOTE: Upon start up, a metallic ticking may  
occur. This is caused by the hydraulic  
lifter leakdown during storage. Run the  
engine for 5 minutes. The noise will  
normally cease in the first minute. If noise  
continues, run the engine at mid-throttle  
for 20 minutes. If noise persists, take the  
engine to your local authorized Kohler  
Engine Service Dealer.  
If the battery charge is not sufficient to crank the  
engine, recharge the battery (see page 12).  
Operating  
Angle of Operation  
This engine will operate continuously at angles up to  
25°. Check oil level to assure crankcase oil level is at  
the “F” mark on the dipstick.  
If the engine develops sufficient speed to  
disengage the starter but does not keep running (a  
false start), the engine rotation must be allowed to  
come to a complete stop before atttempting to  
restart the engine. If the starter is engaged while  
the flywheel is rotating, the starter pinion and  
flywheel ring gear may clash resulting in damage to  
the starter.  
Refer to the operating instructions of the equipment this  
engine powers. Because of equipment design or  
application, there may be more stringent restrictions  
regarding the angle of operation.  
NOTE: Do not operate this engine continuously at  
angles exceeding 25° in any direction. Engine  
damage could result from insufficient  
lubrication.  
If the starter does not turn the engine over, shut off  
starter immediately. Do not make further attempts  
to start the engine until the condition is corrected.  
Do not jump start using another battery (refer to  
“Battery” on this page). See your Kohler Engine  
Service Dealer for service assistance.  
Cooling  
NOTE: If debris builds up on the grass screen or other  
cooling air intake areas, stop the engine  
immediately and clean. Operating the engine  
with blocked or dirty air intake and cooling  
areas can cause extensive damage due to  
overheating.  
CH18-25 Engines Only:  
3. For a Cold Engine – Gradually return the choke  
control to the “off” position after the engine starts  
and warms up.  
The engine/equipment may be operated during the  
warm up period, but it may be necessary to leave  
the choke partially on until the engine warms up.  
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Engine Speed  
WARNING: Hot Parts!  
NOTE: Do not tamper with the governor setting to  
increase the maximum engine speed.  
Overspeed is hazardous and will void the  
engine warranty. The maximum allowable high  
idle speed for these engines is 3750 RPM, no  
load.  
Engine components can get extremely hot from  
operation. To prevent severe burns, do not touch these  
areas while the engine is running–or immediately after it  
is turned off. Never operate the engine with heat shields  
or guards removed.  
Maintenance Instructions  
Maintenance, repair, or replacement of the emission control devices and systems, which are being done  
at the customers expense, may be performed by any non-road engine repair establishment or individual.  
Warranty repairs must be performed by an authorized Kohler service outlet.  
WARNING: Accidental Starts!  
Disabling engine. Accidental starting can cause severe injury or death. Before working on the engine or  
equipment, disable the engine as follows: 1) Disconnect the spark plug lead(s). 2) Disconnect negative (-) battery  
cable from battery.  
Maintenance Schedule  
These required maintenance procedures should be performed at the frequency stated in the table. They should also  
be included as part of any seasonal tune-up.  
Frequency  
Maintenance Required  
• Fill fuel tank.  
• Check oil level.  
Daily or Before  
Starting Engine  
• Check air cleaner for dirty1, loose, or damaged parts.  
• Check air intake and cooling areas, clean as necessary1.  
• Service precleaner element1.  
• Replace air cleaner element1.  
• Change oil. (More frequently under severe conditions.)  
• Remove cooling shrouds and clean cooling areas1,3.  
• Check oil cooler fins, clean as necessary (if equipped).  
Every 25 Hours  
Every 100 Hours  
• Check spark plug condition and gap.  
• Change oil filter.  
Every 200 Hours  
• Have bendix starter drive serviced2.  
Annually or  
Every 500 Hours  
• Have solenoid shift starter disassembled and cleaned2.  
Every 1500 Hours  
• Replace fuel filter1 (CH26 engines).  
1Perform these maintenance procedures more frequently under extremely dusty, dirty conditions.  
2Have a Kohler Engine Service Dealer perform this service.  
3Cleanout Kits 25 755 20 (black) or 25 755 21 (gold) allow cooling areas to be cleaned without removing shrouds.  
3. Remove the dipstick; wipe oil off. Reinsert the  
dipstick into the tube and press all the way down.  
Check Oil Level  
The importance of checking and maintaining the proper  
oil level in the crankcase cannot be overemphasized.  
Check oil BEFORE EACH USE as follows:  
4. Remove the dipstick and check the oil level.  
The oil level should be up to, but not over, the “F”  
mark on the dipstick. See Figure 7.  
1. Make sure the engine is stopped, level, and is cool  
so the oil has had time to drain into the sump.  
2. To keep dirt, debris, etc., out of the engine, clean  
the area around the dipstick before removing it.  
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2. Remove one of the oil drain plugs, oil fill cap, and  
dipstick. Be sure to allow ample time for complete  
drainage.  
“F” Mark  
3. Reinstall the drain plug. Make sure it is tightened  
to 13.6 N·m (10 ft. lb.) torque.  
Operating  
Range  
4. Fill the crankcase, with new oil of the proper type,  
to the “F” mark on the dipstick. Refer to “Oil Type”  
on page 5. Always check the level with the dipstick  
before adding more oil.  
5. Reinstall the oil fill cap and tighten securely.  
Reinstall dipstick.  
Figure 7. Oil Level Dipstick.  
5. If the level is low, add oil of the proper type, up to  
the “F” mark on the dipstick. (Refer to “Oil Type” on  
page 5.) Always check the level with the dipstick  
before adding more oil.  
NOTE: To prevent extensive engine wear or  
damage, always maintain the proper oil  
level in the crankcase. Never operate the  
engine with the oil level below the “L” mark  
or over the “F” mark on the dipstick.  
NOTE: To prevent extensive engine wear or  
damage, always maintain the proper oil  
level in the crankcase. Never operate the  
engine with the oil level below the “L” mark  
or over the “F” mark on the dipstick.  
Oil Sentry™  
Some engines are equipped with an optional Oil  
Sentry™ oil pressure switch monitor. If the oil pressure  
decreases below an acceptable level, the Oil Sentry™  
will either shut off the engine or activate a warning  
signal, depending on the application.  
Oil Filter  
NOTE: Make sure the oil level is checked BEFORE  
EACH USE and is maintained up to the “F”  
mark on the dipstick. This includes engines  
equipped with Oil Sentry™.  
Oil Drain Plug  
Oil Cooler  
Figure 8. Oil Drain Plugs, Oil Filter, and Oil Cooler  
(CH25 shown).  
Change Oil and Filter, Service Oil Cooler  
Change Oil  
Change oil after every 100 hours of operation (more  
frequently under severe conditions). Refill with service  
class SG, SH, SJ or higher oil as specified in the  
‘‘Viscosity Grades’’ table (Figure 3) on page 5.  
Change the oil while the engine is still warm. The oil will  
flow freely and carry away more impurities. Make sure  
the engine is level when filling, checking, and changing  
the oil.  
Oil Filter  
Change the oil as follows (see Figures 8 and 9):  
Oil Cooler  
Oil Drain Plug  
Figure 9. Oil Drain Plugs, Oil Filter, and Oil Cooler  
(CH26 shown).  
1. To keep dirt, debris, etc., out of the engine, clean  
the area around the oil fill cap/dipstick before  
removing it.  
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Change Oil Filter  
Service Precleaner and Air Cleaner Element  
This engine is equipped with a replaceable, high density  
paper air cleaner element. Some engines are also  
equipped with an oiled, foam precleaner which  
surrounds the paper element. See Figure 10.  
Replace the oil filter at least every other oil change  
(every 200 hours of operation). Always use a genuine  
Kohler oil filter, Part No. 12 050 01.  
Replace the oil filter as follows:  
Cover Knob  
Air Cleaner  
1. Drain the oil from the engine crankcase.  
2. Allow the oil filter to drain.  
Cover  
Element  
Cover Nut  
Element Cover  
3. Before removing the oil filter, clean the area  
around the oil filter to keep dirt and debris out of  
the engine. Remove the old filter. Wipe off the  
surface where the oil filter mounts.  
Element  
Precleaner  
4. Place a new replacement filter in a shallow pan  
with the open end up. Pour new oil, of the proper  
type, in through the threaded center hole. Stop  
pouring when the oil reaches the bottom of the  
threads. Allow a minute or two for the oil to be  
absorbed by the filter material.  
Figure 10. Air Cleaner System Components.  
Check the air cleaner daily or before starting the  
engine. Check for a buildup of dirt and debris around  
the air cleaner system. Keep this area clean. Also  
check for loose or damaged components. Replace all  
bent or damaged air cleaner components.  
5. Put a drop of oil on your fingertip and wipe it on the  
rubber gasket.  
6. Install the replacement oil filter to the filter adapter  
or oil cooler. Turn the oil filter clockwise until the  
rubber gasket contacts the filter adapter or oil  
cooler, then tighten the filter an additional  
1/2 turn.  
NOTE: Operating the engine with loose or damaged  
air cleaner components could allow unfiltered  
air into the engine causing premature wear  
and failure.  
Service Precleaner  
7. Reinstall the drain plug. Make sure it is tightened  
If so equipped, wash and reoil the precleaner every 25  
hours of operation (more often under extremely dusty  
or dirty conditions).  
to 13.6 N·m (10 ft. lb.) torque.  
8. Fill the crankcase with new oil of the proper type to  
the “F” mark on the dipstick. Add 0.24 L (1/2 pint)  
of oil for the filter capacity.  
1. Loosen the cover retaining knob and remove the  
cover.  
9. Start the engine and check for oil leaks. Correct  
any leaks before placing the engine into service.  
Check oil level to be sure it is up to but not over the  
“F” mark.  
2. Remove the precleaner from the paper element.  
3. Wash the precleaner in warm water with detergent.  
Rinse the precleaner thoroughly until all traces of  
detergent are eliminated. Squeeze out excess  
water (do not wring). Allow the precleaner to air  
dry.  
Service Oil Cooler  
Some engines are equipped with an oil cooler. Inspect  
and clean the oil cooler every 100 hours of operation  
(more frequently under severe conditions). Oil cooler  
must be kept free of debris.  
4. Saturate the precleaner with new engine oil.  
Squeeze out all excess oil.  
To service the oil cooler, clean off the outside fins with a  
brush or with compressed air.  
5. Reinstall the precleaner over the paper element.  
6. Reinstall the air cleaner cover. Secure cover with  
the cover retaining knob.  
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7. When precleaner replacement is necessary, order  
genuine Kohler parts.  
Clean Air Intake/Cooling Areas  
To ensure proper cooling, make sure the grass screen,  
cooling fins, and other external surfaces of the engine  
are kept clean at all times.  
24 083 02 61 mm deep x 173 mm O.D.  
24 083 05 71 mm deep x 173 mm O.D.  
Every 100 hours of operation (more often under  
extremely dusty, dirty conditions), remove the blower  
housing and other cooling shrouds.* Clean the cooling  
fins and external surfaces as necessary. Make sure the  
cooling shrouds are reinstalled.  
Service Paper Element  
Every 100 hours of operation (more often under  
extremely dusty or dirty conditions) replace the paper  
element.  
1. Loosen the cover retaining knob and remove the  
cover.  
NOTE: Operating the engine with a blocked grass  
screen, dirty or plugged cooling fins, and/or  
cooling shrouds removed, will cause engine  
damage due to overheating.  
2. Remove the element cover nut, element cover, and  
paper element with precleaner.  
*Cleanout kits 25 755 20 (black) or 25 755 21 (gold)  
allow inspection and cleanout of the cooling fins.  
3. Remove the precleaner (if so equipped) from the  
paper element.  
Ignition System  
4. Do not wash the paper element or use  
pressurized air, as this will damage the element.  
Replace a dirty, bent, or damaged element with a  
genuine Kohler element. Handle new elements  
carefully; do not use if the sealing surfaces are  
bent or damaged.  
CH18-25 Engines - Use an electronic Capacitive  
Discharge (CD) ignition system. Other than  
periodically checking/replacing the spark plugs, no  
maintenance, timing, or adjustments are necessary or  
possible with this system.  
5. When servicing the air cleaner, check the air  
cleaner base. Make sure it is secured and not bent  
or damaged. Also check the element cover for  
damage or improper fit. Replace all damaged air  
cleaner components.  
CH26 Engines - Incorporate a computer controlled and  
monitored ignition system with individual coils. Other  
than periodically checking/replacing the spark plugs, no  
maintenance, timing, or adjustments are necessary or  
possible with this system.  
NOTE: If any loose dirt or debris fell on the air  
cleaner base when the element was  
removed, carefully remove it and wipe the  
base clean. Be careful that none of it  
drops into the intake throat. Check the  
condition of the rubber seal on the air  
cleaner stud. If the condition is  
Check Spark Plugs  
Every 200 hours of operation, remove the spark plugs,  
check condition, and reset the gap or replace with new  
plugs as necessary. The standard spark plug is a  
Champion® RC12YC (Kohler Part No. 12 132 02). A  
high-performance spark plug, Champion® Premium  
Gold 2071 (used on Pro Series engines, Kohler Part  
No. 12 132 06) is also available. Equivalent alternate  
brand plugs can also be used.  
questionable in any way, replace it with  
the new seal packaged with the  
replacement element.  
1. Before removing the spark plug, clean the area  
around the base of the plug to keep dirt and debris  
out of the engine.  
6. Reinstall the paper element, precleaner, element  
cover, element cover nut, and air cleaner cover.  
Secure cover with the cover retaining knob.  
2. Remove the plug and check its condition. Replace  
the plug if worn or reuse is questionable.  
7. When element replacement is necessary, order  
genuine Kohler parts.  
NOTE: Do not clean the spark plug in a machine  
using abrasive grit. Some grit could  
remain in the spark plug and enter the  
engine causing extensive wear and  
damage.  
47 083 03 65 mm deep x 178 mm O.D.  
24 083 03 74 mm deep x 178 mm O.D.  
11  
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3. Check the gap using a wire feeler gauge. Adjust  
the gap to 0.76 mm (0.030 in.) by carefully  
bending the ground electrode. See Figure 11.  
Fuel System  
WARNING: Fuel System Under Pressure!  
The CH26 fuel system operates under high pressure,  
and the fuel filter and fuel line used must be approved  
system components only. Use of substitute parts can  
result in system failure, gasoline leakage and possible  
explosion.  
Wire Gauge  
Spark Plug  
Fuel Filter  
CH18-25 Engines: Some engines are equipped with  
an in-line fuel filter. Periodically inspect the filter and  
replace when dirty. Always use genuine Kohler parts.  
CH26 Engines: A special, high volume, high pressure  
filter with greater filtration capabilities and internal  
surface area is used. See Figure 12.  
0.76 mm  
(0.030 in.) Gap  
Fuel Filter  
Figure 11. Servicing Spark Plug.  
4. Reinstall the spark plug into the cylinder head.  
Torque the spark plug to 24.4/29.8 N·m  
(18/22 ft. lb.).  
Fuel Line  
Figure 12. CH26 Fuel Filter and Line.  
Battery Charging  
Replacement is recommended every 1500 hours, or  
more frequently under extremely dusty or dirty  
conditions. When replacement is necessary, always  
use genuine Kohler parts.  
WARNING: Explosive Gas!  
Batteries produce explosive hydrogen gas while being  
charged. To prevent a fire or explosion, charge batteries  
only in well ventilated areas. Keep sparks, open flames,  
and other sources of ignition away from the battery at  
all times. Keep batteries out of the reach of children.  
Remove all jewelry when servicing batteries.  
Fuel Line  
CH26 Engines: A special fuel line capable of  
withstanding the high pressure of the EFI fuel system is  
used (must meet SAE R9 specifications). See Figure  
12. If fuel line must be replaced, see your Kohler Engine  
Service Dealer.  
Before disconnecting the negative (–) ground cable,  
make sure all switches are OFF. If ON, a spark will  
occur at the ground cable terminal which could cause  
an explosion if hydrogen gas or gasoline vapors are  
present.  
NOTE: Do not apply 12 volt DC to kill terminal of  
ignition module.  
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• Make sure the air cleaner element is clean and all  
air cleaner element components are fastened  
securely.  
CH18-25 Carburetor Troubleshooting and  
Adjustments  
NOTE: Carburetor adjustments should be made only  
after the engine has warmed up.  
If, after checking the items listed above, the engine is  
hard to start, runs roughly, or stalls at low idle speed, it  
may be necessary to adjust or service the carburetor.  
The carburetor is designed to deliver the correct  
fuel-to-air mixture to the engine under all operating  
conditions. The high idle is set at the factory and cannot  
be adjusted. The low idle fuel adjusting needle is also  
set at the factory and normally does not need  
adjustment.  
Adjust Carburetor  
NOTE: Certified engines may have a fixed idle or  
limiter cap on the idle fuel adjusting needle. Do  
not attempt steps 1 and 2 below. Proceed  
directly to step 3. Step 4 can only be  
performed within the limits allowed by the cap.  
If the engine is hard to start, runs roughly, or stalls at  
low idle speed, it may be necessary to adjust or service  
the carburetor.  
1. With the engine stopped, turn the low idle fuel  
adjusting needle in (clockwise) until it bottoms  
lightly.  
NOTE: The tip of the low idle fuel adjusting  
needle is tapered to critical dimensions.  
Damage to the needle and the seat in  
carburetor body will result if the needle is  
forced.  
Low Idle  
Fuel Adj.  
Needle &  
Low Idle  
Speed Adj.  
Screw  
Spring  
2. Preliminary Low Idle Fuel Needle Setting: Turn  
the adjusting needle out (counterclockwise) from  
lightly bottomed position 1-5/8 turns.  
Fixed Main Jet  
(under optional  
solenoid)  
3. Start the engine and run at half throttle for 5 to 10  
minutes to warm up. The engine must be warm  
before making final settings (steps 4 and 5).  
Figure 13. Carburetor (CH18-25).  
4. Low Idle Fuel Needle Setting: Place the throttle  
into the “idle” or “slow” position. Turn the low  
idle fuel adjusting needle in (slowly) from the  
preliminary setting until engine speed decreases  
and then back out approximately 3/4 to 1 turn to  
obtain the best low-speed performance.  
Troubleshooting  
If engine troubles are experienced that appear to be  
fuel system related, check the following areas before  
adjusting the carburetor.  
• Make sure the fuel tank is filled with clean, fresh  
gasoline.  
5. Low Idle Speed Setting: Place the throttle  
control into the “idle” or “slow” position. Set the  
low idle speed to 1200 RPM* (± 75 RPM) by  
turning the low idle speed adjusting screw in or  
out. Check the speed using a tachometer.  
• Make sure the fuel tank cap vent is not blocked  
and that it is operating properly.  
• If the fuel tank is equipped with a shut-off valve,  
make sure it is open.  
*NOTE: The actual low idle speed depends on the  
application – refer to equipment  
• If the engine is equipped with an in-line fuel filter,  
make sure it is clean and unobstructed. Replace  
the filter if necessary.  
manufacturer’s recommendations. The  
recommended low idle speed for basic  
engines is 1200 RPM. To ensure best  
results when setting the low idle fuel  
needle, the low idle speed must not  
exceed 1200 RPM (± 75 RPM).  
• Make sure fuel is reaching the carburetor. This  
includes checking the fuel lines and fuel pump for  
restrictions or faulty components, replace as  
necessary.  
13  
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CH26 Electronic Fuel Injection (EFI)  
Adjustment – EFI Throttle Body  
System  
Low Idle Speed (RPM) is the only adjustment that can  
be made. All other fuel calibrations are permanently  
preset and controlled by the ECU. The standard low idle  
speed is 1500 RPM* (+ 75 RPM).  
The EFI system is a complete, electronically controlled  
fuel management system, designed to deliver a  
precisely controlled fuel flow under all operating  
conditions. The electronic control unit (ECU), the  
‘‘brain’’ of the system, automatically adjusts fuel  
delivery and ignition timing based upon load, speed,  
operating temperature, and exhaust emission levels.  
The low idle speed is the only manual adjustment  
possible.  
*NOTE: The actual low idle speed depends on the  
application -- refer to equipment manufacturer's  
recommendations.  
When an EFI engine is started cold, the ECU will briefly  
set a higher (200-400 RPM) low idle speed, similar to a  
fast idle. Do not attempt to perform any readjustment  
during this ‘‘warm-up’’ period.  
The ECU continuously monitors operation of the EFI  
system. If it detects a problem or fault within the  
system, it will illuminate the malfunction indicator light  
(MIL), which is mounted in view of the operator. This is a  
signal that normal, programmed operation has been  
affected, and service by an authorized Kohler Engine  
Dealer is required.  
If adjustment is to be made, the engine must be at  
operating temperature, air cleaner in place, and check  
engine light must be off (no fault codes present).  
1. Start the engine and run at half throttle for 5 to 10  
minutes to warm up.  
Troubleshooting  
If the MIL comes on, or the engine becomes hard to  
start, runs roughly, or stalls at low idle speed, initial  
checks should be made in the following areas:  
2. Place the throttle control into the ‘‘idle’’ or  
‘‘slow’’ position.  
• Make sure the fuel tank is filled with clean, fresh  
gasoline, and shut-off valve (if so equipped) is  
opened completely.  
3. Turn the low idle speed adjusting screw in or out  
and check RPM with a tachometer. See Figure 14.  
• Make sure fuel tank vent cap is not blocked and it  
is operating properly.  
Low Idle Speed  
Adjusting Screw  
• Make sure the air cleaner element and precleaner  
are clean and all components are properly  
secured. Clean or replace as necessary.  
Throttle Body  
Intake Manifold  
• Make sure the proper fuel filter is being used, and  
it is clean and unobstructed. Replace filter only  
with genuine Kohler parts.  
Fuel Rail  
• Make sure all connections to sensors, ECU, and  
fuel injectors are properly secured.  
Figure 14.  
• Make sure a good 12 volt battery is being used and  
is fully charged.  
If these checks do not correct the problem, or the MIL  
remains on, further diagnosis and servicing by an  
authorized Kohler Engine Dealer is necessary.  
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Troubleshooting  
When troubles occur, be sure to check the simple causes which, at first, may seem too obvious to be considered.  
For example, a starting problem could be caused by an empty fuel tank. Some common causes of engine troubles  
are listed in the following table.  
Do not attempt to service or replace major engine components, or any items that require special timing or  
adjustment procedures. Have your Kohler Engine Service Dealer do this work.  
Possible Cause No Improper  
Dirt In  
Dirty  
Incorrect  
Engine  
Overloaded  
Dirty Air  
Cleaner  
Faulty  
Spark Plug  
Problem  
Fuel  
Fuel Fuel Line/System Grass Screen Oil Level  
Will Not Start  
Hard Starting  
Stops Suddenly  
Lacks Power  
Operates Erratically  
Knocks or Pings  
Skips or Misfires  
Backfires  
Overheats  
High Fuel Consumption  
Storage  
Parts Ordering  
If the engine will be out of service for two months or  
more, use the following storage procedure:  
The engine Specification, Model, and Serial Numbers  
are required when ordering replacement parts from your  
Kohler Engine Service Dealer. These numbers are found  
on the identification plate which is affixed to the engine  
shrouding. Include letter suffixes if there are any. See  
“Engine Identification Numbers” on page 6.  
1. Clean the exterior surfaces of the engine.  
2. Change the oil and filter while the engine is still  
warm from operation. See “Change Oil and Oil  
Filter” on page 9.  
Always insist on genuine Kohler parts. All genuine  
Kohler parts meet strict standards for fit, reliability, and  
performance.  
3. The fuel system must be completely emptied, or  
the gasoline must be treated with a stabilizer to  
prevent deterioration. If you choose to use a  
stabilizer, follow the manufacturers  
Major Repair  
Major repair information is available in Kohler Engine  
Service Manuals. However, major repair generally  
requires the attention of a trained mechanic and the use  
of special tools and equipment. Your Kohler Engine  
Service Dealer has the facilities, training, and genuine  
Kohler replacement parts necessary to perform this  
service. For Sales & Service assistance call  
1-800-544-2444 (U.S. & Canada) or contact your  
Kohler Engine Dealer or Service Distributor, they're in  
the Yellow Pages under Engines-Gasoline.  
recommendations, and add the correct amount for  
the capacity of the fuel system. Fill the fuel tank  
with clean, fresh gasoline. Run the engine for 2-3  
minutes to get stabilized fuel into the carburetor.  
Close fuel shut-off valve when unit is being stored  
or transported.  
To empty the system, run the engine until the tank  
and system are empty.  
4. Remove the spark plugs. Add one tablespoon of  
engine oil into each spark plug hole. Install the  
Model Designation  
Model CH20S for example: C designates Command  
engine, H designates horizontal crankshaft, and 20  
designates horsepower. A letter suffix designates a  
specific version as follows:  
plugs, but do not connect the plug leads. Crank the  
engine two or three revolutions.  
5. Store the engine in a clean, dry place.  
Suffix  
S
Designates  
Electric Start  
GS  
ST  
QS  
EP  
CS  
Generator Application/Electric Start  
Electric Start/Retractable Start  
Quiet Model/Electric Start  
Electric Plant  
Clutch Model/Electric Start  
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Specifications  
Model: ................................................ CH18 .................. CH20.................. CH22 ................. CH25/CH26  
Bore: ............................... in. (mm) ... 3.03 (77) ............. 3.03 (77) ............ 3.03 (77)#  
...................  
3.27 (83)/3.27 (83)  
Stroke: ............................ in. (mm) ... 2.64 (67) ............. 2.64 (67) ............ 2.64 (67) ............ 2.64 (67)/2.64 (67)  
Displacement:................ in3 (cm3) ... 38.1 (624) ........... 38.1 (624) .......... 38.1 (624)#  
44.0 (725)/44.0 (725)  
...............  
Power (@3600 RPM): ..... HP (kW)... 18* (13.4) ........... 20* (14.9) ........... 22* (16.4)........... 25* (18.4)/26 (19.4 )  
Max. Torque: ........... (ft. lbs. @ RPM) ... 30 (41) @2500 ..... 32 (44) @2500 .... 33 (45) @2500 .... 39.5 (54) @2400/41.6 (56.4) @2200  
Compression Ratio: ......................... 8.5:1.................... 8.5:1 ................... 8.5:1 ................... 9.0:1/9.0:1  
Weight:............................. lbs. (kg) ... 90 (41) ................ 90 (41)................ 90 (41) ............... 94 (43)/94 (43)  
Oil Capacity (w/filter): .. U.S. qt. (L) ... 2.1 (2) ................. 2.1 (2) ................. 2.1 (2) ................ 2.1 (2)/2.1 (2)  
Lubrication: ................................................  
Full Pressure w/full Flow Filter  
*Horsepower ratings are established in accordance with Society of Automotive Engineers – Small Engine Test Code – J1349  
GROSS. Kohler Co. reserves the right to change product specifications, design, and standard equipment without notice and  
without incurring obligation.  
#CH22 engines with Spec. Numbers of 765xx have bore size of 3.15 in. (80 mm) and displacement of 41.1 in3 (674 cm3).  
LIMITED 2 YEAR COMMAND ENGINE WARRANTY  
We warrant to the original consumer that each new COMMAND engine sold by us will be free from manufacturing defects in materials or  
workmanship in normal service for a period of two (2) years from date of purchase, provided it is operated and maintained in accordance with  
Kohler Co.’s instructions and manuals.  
Our obligation under this warranty is expressly limited, at our option, to the replacement or repair at Kohler Co., Kohler, Wisconsin 53044, or  
at a service facility designated by us of such parts as inspection shall disclose to have been defective.  
EXCLUSIONS:  
This warranty does not apply to defects caused by casualty or unreasonable use, including faulty repairs by others and failure to provide  
reasonable and necessary maintenance.  
The following items are not covered by this warranty:  
Engine accessories such as fuel tanks, clutches, transmissions, power-drive assemblies, and batteries, unless supplied or installed by Kohler  
Co. These are subject to the warranties, if any, of their manufacturers.  
WE SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY KIND, including but not  
limited to labor costs or transportation charges in connection with the repair or replacement of defective parts.  
ANY IMPLIED OR STATUARYWARRANTIES, INCLUDING WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR  
PURPOSE, ARE EXPRESSLY LIMITED TO THE DURATION OF THIS WRITTEN WARRANTY. We make no other express warranty, nor is  
any one authorized to make any in our behalf.  
Some states do not allow limitations on how long an implied warranty lasts, or the exclusion or limitation of incidental or consequential  
damages, so the above limitation or exclusion may not apply to you.  
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.  
TO OBTAIN WARRANTY SERVICE:  
Purchaser must bring the engine to an authorized Kohler service facility. For the facility nearest you, consult your Yellow Pages or write  
Kohler Co., Attn: Engine Warranty Service Dept., Kohler, Wisconsin, 53044.  
ENGINE DIVISION, KOHLER CO., KOHLER, WISCONSIN 53044  
16  
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KOHLER CO.  
FEDERAL AND CALIFORNIA EMISSION CONTROL SYSTEMS  
LIMITED WARRANTY  
UTILITY AND LAWN AND GARDEN ENGINES  
The U.S. Environmental Protection Agency (EPA), the California Air Resources Board (CARB), and Kohler Co. are pleased to explain the Federal  
and California Emission Control Systems Warranty on your utility/lawn/garden equipment engine (herein engine). For California, engines  
produced in 1995 and later must be designed, built and equipped to meet the state’s stringent anti-smog standards. In other states, new 1997  
and later model year engines must be designed, built and equipped, at the time of sale, to meet the U.S. EPA regulations for small non-road  
engines. The engine must be free from defects in materials and workmanship which cause it to fail to conform with U.S. EPA standards for the  
first two years of engine use from the date of sale to the ultimate purchaser. Kohler Co. must warrant the emission control system on the engine  
for the period of time listed above, provided there has been no abuse, neglect or improper maintenance.  
The emission control system may include parts such as the carburetor or fuel injection system, the ignition system, and catalytic converter.  
Also included are the hoses, belts and connectors and other emission related assemblies.  
Where a warrantable condition exists, Kohler Co. will repair the engine at no cost, including diagnosis (if the diagnostic work is performed at an  
authorized dealer), parts and labor.  
MANUFACTURER’S WARRANTY COVERAGE  
Engines produced in 1995 or later are warranted for two years in California. In other states, 1997 and later model year engines are warranted for  
two years. If any emission related part on the engine is defective, the part will be repaired or replaced by Kohler Co. free of charge.  
OWNER’S WARRANTY RESPONSIBILITIES  
(a) The engine owner is responsible for the performance of the required maintenance listed in the owner’s manual. Kohler Co. recommends  
that you retain all receipts covering maintenance on the engine, but Kohler Co. cannot deny warranty solely for the lack of receipts or for  
your failure to assure that all scheduled maintenance was performed.  
(b) Be aware, however, that Kohler Co. may deny warranty coverage if the engine or a part has failed due to abuse, neglect, improper  
maintenance or unapproved modifications.  
(c) For warranty repairs, the engine must be presented to a Kohler Co. service center as soon as a problem exists. Call 1-800-544-2444 for  
the names of the nearest service centers. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30  
days.  
If you have any questions regarding warranty rights and responsibilities, you should contact Kohler Co. Engine Service at 1-920-457-4441.  
COVERAGE  
Kohler Co. warrants to the ultimate purchaser and each subsequent purchaser that the engine will be designed, built and equipped, at the time  
of sale, to meet all applicable regulations. Kohler Co. also warrants to the initial purchaser and each subsequent purchaser, that the engine is  
free from defects in materials and workmanship which cause the engine to fail to conform with applicable regulations for a period of two years.  
Engines produced in 1995 or later are warranted for two years in California. For 1997 and later model years, EPA requires manufacturers to  
warrant engines for two years in all other states. These warranty periods will begin on the date the engine is purchased by the initial purchaser.  
If any emission related part on the engine is defective, the part will be replaced by Kohler Co. at no cost to the owner. Kohler Co. is liable for  
damages to other engine components caused by the failure of a warranted part still under warranty.  
Kohler Co. shall remedy warranty defects at any authorized Kohler Co. engine dealer or warranty station. Warranty repair work done at an  
authorized dealer or warranty station shall be free of charge to the owner if such work determines that a warranted part is defective.  
Listed below are the parts covered by the Federal and California Emission Control Systems Warranty. Some parts listed below may require  
scheduled maintenance and are warranted up to the first scheduled replacement point for that part. The warranted parts are:  
Carburetor assembly  
Ignition module(s) with high tension lead  
Throttle body (EFI Systems)  
Catalytic muffler (if equipped)  
Fuel metering valve (if equipped)  
Crankcase breather  
Spark advance module (if equipped)  
Oxygen, speed, throttle position, and temperature sensors (if equipped)  
Electronic control unit (if equipped)  
Fuel injectors (EFI Systems)  
Air filter, fuel filter, and spark plugs (only to first scheduled replacement point)  
Fuel pressure regulator (EFI Systems)  
Continued on next page.  
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LIMITATIONS  
This Emission Control Systems Warranty shall not cover any of the following:  
(a) repair or replacement required because of misuse or neglect, improper maintenance, repairs improperly performed or replacements not  
conforming to Kohler Co. specifications that adversely affect performance and/or durability and alterations or modifications not  
recommended or approved in writing by Kohler Co.,  
(b) replacement of parts and other services and adjustments necessary for required maintenance at and after the first scheduled replacement  
point,  
(c) consequential damages such as loss of time, inconvenience, loss of use of the engine or equipment, etc.,  
(d) diagnosis and inspection fees that do not result in eligible warranty service being performed, and  
(e) any add-on or modified part, or malfunction of authorized parts due to the use of add-on or modified parts.  
MAINTENANCE AND REPAIR REQUIREMENTS  
The owner is responsible for the proper use and maintenance of the engine. Kohler Co. recommends that all receipts and records covering the  
performance of regular maintenance be retained in case questions arise. If the engine is resold during the warranty period, the maintenance  
records should be transferred to each subsequent owner. Kohler Co. reserves the right to deny warranty coverage if the engine has not been  
properly maintained; however, Kohler Co. may not deny warranty repairs solely because of the lack of repair maintenance or failure to keep  
maintenance records.  
Normal maintenance, replacement or repair of emission control devices and systems may be performed by any repair establishment or  
individual; however, warranty repairs must be performed by a Kohler authorized service center. Any replacement part or service that  
is equivalent in performance and durability may be used in non-warranty maintenance or repairs, and shall not reduce the warranty obligations of the  
engine manufacturer.  
18  
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FOR SALES AND SERVICE INFORMATION  
IN U.S. AND CANADA, CALL  
1-800-544-2444  
FORM NO.: TP-2474-E  
ISSUED:  
REVISED:  
MAILED:  
12/94  
5/99  
ENGINE DIVISION, KOHLER CO., KOHLER, WISCONSIN 53044  
LITHO IN U.S.A.  
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