GP90135
OPERATOR’S MANUAL
WHEELBARROW
AIR
COMPRESSOR
!
WARNING
Read and follow all Safety Rules
before first use of this product.
IN610400AV
Printed in U.S.A.
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16. Fast moving air will stir up dust and
debris which may be harmful.
Release air slowly when draining
moisture or depressurizing the com-
pressor system.
repairing or inspecting, make certain all
moving parts have stopped. Disconnect
the spark plug wire and keep the wire
away from the plug to prevent acciden-
tal starting.
Safety Instructions (continued)
10. Keep fingers away from a running
repair in or near a flammable
compressor; fast moving and hot
parts will cause injury and/or burns.
gas or vapor. Never store flam-
mable liquids or gases in the
vicinity of the compressor.
17. STOP the engine whenever leaving the 18. Allow engine to cool before storing.
work area, before cleaning, making
11. If the equipment should start to
vibrate abnormally, STOP the
engine/motor and check immediately
for the cause. Vibration is generally a
warning of trouble.
repairs or inspections. When cleaning,
!
WARNING
Spraying Precautions
Carbon monoxide can
cause severe nausea,
fainting or death. Do
not operate unit
inside a closed building or a
poorly ventilated area.
ed area to prevent health and fire
hazards.
!
WARNING
!
WARNING
NEVER refuel a run-
ning or hot engine.
Explosive fuel can cause fires
and severe burns. Avoid over-
filling fuel tank.
21. Do not direct paint or other sprayed
material at the compressor. Locate
compressor as far away from the
spraying area as possible to mini-
mize overspray accumulation on the
compressor.
Do not spray flam-
mable materials in
vicinity of open
flame or near ignition sources
including the compressor unit.
13. To reduce fire hazard, keep
engine/motor exterior free of oil, sol-
vent, or excessive grease.
12. Check fuel level before starting the
engine. Do not fill the gas tank
indoors. Wipe off any spilled gas
before starting the engine.
22. When spraying or cleaning with sol-
vents or toxic chemicals, follow the
instructions provided by the chemi-
cal manufacturer.
19. Do not smoke when spraying paint,
insecticides, or other flammable sub-
stances.
!
WARNING
20. Use a face mask/respirator when
spraying and spray in a well ventilat-
Never remove or attempt to
adjust safety valve. Keep safety
valve free from paint and other
accumulations.
!
DANGER
Gasoline vapor is highly flam-
mable. Refill outdoors or only in
well ventilated areas. Do not
store, spill or use gasoline near
an open flame or heat devices
such as a stove, furnace, or
water heater, which utilize a
pilot light, or any device that
can create a spark. If gasoline
is accidentally spilled, move
unit away from the spill area
and avoid creating any source
of ignition until gasoline vapors
have dissipated.
!
DANGER
14. Do not tamper with governor setting
on engine. Overspeeding the unit
severely shortens engine life and may
also be very hazardous.
Breathable Air Warning
This compressor/pump is not equipped and should not be used “as
is” to supply breathing quality air. For any application of air for
human consumption, the air compressor/pump will need to be fitted
with suitable in-line safety and alarm equipment. This additional
equipment is necessary to properly filter and purify the air to meet
minimal specifications for Grade D breathing as described in
Compressed Gas Association Commodity Specification G 7.1 - 1966,
OSHA 29 CFR 1910. 134, and/or Canadian Standards Associations
(CSA).
!
DANGER
Never attempt to
repair or modify a
tank! Welding, drilling
or any other modification will
weaken the tank resulting in
damage from rupture or explo-
sion. Always replace worn or
damaged tanks.
DISCLAIMER OF WARRANTIES
In the event the compressor is used for the purpose of breathing air
application and proper in-line safety and alarm equipment is not
simultaneously used, existing warranties shall be voided, and
Campbell Hausfeld disclaims any liability whatsoever for any loss,
personal injury or damage.
!
WARNING
Motors, electrical
equipment and con-
trols can cause electrical arcs
that will ignite a flammable gas
or vapor. Never operate or
15. Tanks rust from moisture build-up,
which weakens the tank. Make sure to
drain tank daily and inspect periodical-
ly for unsafe conditions such as rust
formation and corrosion
.
4
5
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Safety Instructions (continued)
Glossary of Terms
ASME Safety Valve
Amps or Amperage
Warning Labels
A safety valve that automatically releases A measure of the electrical force minus
the air if the air receiver (tank) pressure
exceeds the preset maximum.
Find and read all warning labels found on
the air compressor shown below
the resistance on an electrical line.
Ridgid air compressors require 15 amps
for operation. Be sure the compressor
will operate on an electrical line with the
proper amps. If other appliances operate
on the same line, they will reduce the
available amps. If the amperage is not
adequate, the result will be blown fuses
or tripped circuits.
PSI (Pounds per Square Inch)
Measurement of the pressure exerted by
the force of the air. The actual psi output
is measured by a pressure gauge on the
compressor
SCFM (Standard Cubic Feet per
Minute)
Sometimes called CFM (Cubic Feet per
Minute). Measurement of air volume
delivered by the compressor.
Regulator
A control that adjusts the line pressure to
the proper amount needed to operate
spray guns and air tools.
Air Delivery
Tank Pressure Gauge
Indicates tank pressure in psi.
A combination of psi and SCFM. The air
delivery required by a tool is stated as
(number) SCFM at (number) psi. The
combination of these figures determines
what size unit is needed.
Line Pressure Gauge
Displays the current line pressures. It is
regulated by the regulator knob.
Air Tank Capacity
Cut-in/Cut-off Pressure
The volume of air stored in the tank and
Specific psi at which a compressor starts
available for immediate use. A large tank and stops while refilling the air tank.
allows the intermittent use of an air tool
with an air requirement higher than the
compressor’s rated delivery.
Volts or Voltage
A measurement of the force of an electri-
cal current.
DK724100AV 10
Figure 1
6
7
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1. Air Filter. The air filter keeps dirt and
debris from entering the compressor
pump.
Unpacking and Checking Contents
1. Remove the air compressor from the
Dipstick
Add Oil
carton.
Max
Low
!
WARNING
2. Dipstick. The dipstick measures the
oil level in the compressor pump (See
Figure 3).
Fill
Line
2. Place the compressor on a secure,
stationary work surface and look it
over carefully.
For your own safety, never
operate unit until all assembly
steps are complete and until
you have read and understood
the entire operator’s manual.
3. ASME Safety Valve. This valve auto-
matically releases air if the tank pres-
sure exceeds the preset maximum.
!
WARNING
4. Regulator Knob. This knob controls
air pressure to an air operated tool or
paint spray gun. Turning the knob
clockwise increases air pressure at
the outlet. Turning counterclockwise
will lower air pressure at the outlet.
Fully counterclockwise will shut off
the flow of air completely (See Figure
4).
Figure 3
Do not operate unit if damaged
during shipping, handling or
use. Damage may result in
bursting and cause injury or
property damage.
!
WARNING
To reduce the risk of injury, if
any parts are missing, do not
attempt to assemble the air
compressor until the missing
parts are obtained and installed
correctly.
Close
Open
5. Tank Drain Valve. The tank drain
valve allows moisture to be removed
from the tank. Note that each tank
has its own tank drain valve.
Attach
Hose
Getting to Know Your Air Compressor
Figure 4
6. Unloader. The unloader controls the
engine rpm. When loaded, the engine
will run at maximum operating speed
and air will enter the tank. When
7 Beltguard
1 Filter
2 Dipstick
unloaded, the engine will slow to an
idle and air will vent to atmosphere.
3 Safety Valve
4 Regulator
7. Belt Guard. The belt guard encloses
the pulleys and drive belt. It protects
the user from moving parts and
directs cooling air to the compressor
pump
5 Tank
Drain
6 Unloader
Figure 2
8
9
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Lubrication
Operating Your Air Compressor
Dipstick
Add Oil
Max
Low
!
NOTICE
CAUTION
NOTICE
Fill
Line
THIS UNIT CONTAINS NO OIL!
Follow lubrication instructions
before operating compressor.
Before starting the compressor,
thoroughly read all component
instruction manuals, especially
the engine manual.
Drain liquid from tank daily.
Remove the dipstick/ breather and fill
pump with 12 ounces of oil. Use single vis-
cosity, ISO 100 (SAE 30), non-detergent
compressor oil; or Mobil 1® 5W30 or
10W30 synthetic oil may also be used.
Proper oil fill is illustrated in Figure 5.
!
CAUTION
All lubricated compressor pumps dis-
charge some condensed water and oil
with the compressed air. Install appropri-
ate water/oil removal equipment and con-
trols as necessary for the intended appli-
cation.
Do not attach air tools to open
end of the hose until start-up is
completed and unit checks OK.
Figure 5
Start-Up
NOTICE
1. Fill engine with oil and gasoline per
instructions furnished with engine.
Failure to install appropriate
water/oil removal equipment
may result in damage to
machinery or workpiece.
2. Remove the compressor dipstick
breather and fill pump to the proper oil
level.
3. Turn regulator knob counterclockwise
to open air flow.
4. Turn manual unloader lever up to a
horizontal position to allow the com-
pressor pump to run without com-
pressing air. (See Figure 6).
Moisture in Compressed Air
Moisture in compressed air will form into IMPORTANT: This condensation will
droplets as it comes from an air compres- cause water spots in a paint job, especial-
sor pump. When humidity is high or when ly when spraying other than water based
a compressor is in continuous use for an paints. If sandblasting, it will cause the
extended period of time, this moisture will sand to cake and clog the gun, rendering
collect in the tank. When using a paint it ineffective.
Figure 6 - Manual Lever Unloaded Position
spray or sandblast gun, this water will be A filter in the air line, located as near to the
carried from the tank through the hose, gun as possible, will help eliminate this
and out of the gun as droplets mixed with moisture.
the spray material.
10
11
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Operating Your Air Compressor
(continued)
Maintenance
To Start Gasoline Engine
!
WARNING
!
DANGER
Release all pressure from the
system before attempting to
install, service, relocate or per-
form any maintenance.
5. Move the choke lever to the CHOKE
position, turn the fuel lever ON, and
turn the engine stop switch to the ON
position.
Do not attempt to tamper with
the ASME safety valve!
6. Pull start grip lightly until resistance is
felt, and then pull briskly.
In order to maintain efficient operation of
the compressor system, check the air fil-
ter weekly (per maintenance schedule),
oil level and gasoline level before each
use. The ASME safety valve should also
be checked weekly. Pull ring on safety
valve and allow the ring to snap back to
normal position. This valve automatically
releases air if the tank pressure exceeds
the preset maximum. If air leaks after the
ring has been released, or the valve is
stuck and cannot be actuated by the ring,
the ASME safety valve MUST be
7. As the engine warms up, gradually
move the choke lever to the open posi-
tion. See gas engine manual for more
details.
8. Run the compressor unloaded for
approximately 30 minutes to break in
the pump.
9. After approximately 30 minutes, move
the unloader lever down to the loaded
position and turn the regulator knob
clockwise (See Figures 7 and 8). The
compressor will begin to pump air into
the tank.
Figure 7 - Manual Lever Loaded Position
Figure 9
Open
Close
replaced.
When maximum tank pressure is
reached, the compressor automatically
unloads, bringing the engine to idle. The
engine remains at idle until tank pressure
falls to a preset level. The engine then
accelerates and the compressor pumps
additional air into the tank.
With engine OFF, clean debris from
engine, flywheel, tank, air lines and
pump cooling fins.
Figure 8 -Regulator Knob
Maintenance Schedule
Operation
Daily
Weekly Monthly 3 Months
Check Oil Level
Drain Tank
G
G
Check Air Filter
Check Safety Valve
Blow Dirt From Unit
Check Belt Tightness
Change Oil
G
G
G
G
G
12
13
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Drive Belt
Maintenance (continued)
Belt stretch is a result of normal use.
When properly adjusted, the belt deflects
about 1/2” with five pounds of pressure
applied midway between the engine pul-
ley and pump (See Figure 12).
Tank
1/2” Deflection
!
DANGER
Never attempt to repair or modi-
fy a tank! Welding, drilling or
any other modification will
weaken the tank resulting in
damage from rupture or explo-
sion. Always replace worn,
cracked or damaged tanks.
To adjust drive belt tension:
1. Remove belt guard and loosen
engine brace.
2. Loosen the four fasteners holding the
engine to the baseplate.
3. Shift the engine in the proper direc-
tion. The belt must be properly
aligned when adjustment is made.
4. To align belt, lay a straight edge
against the face of the flywheel,
touching the rim at two places (See
Figure 13).
5. Adjust flywheel or engine pulley so
that the belt runs parallel to the
straight edge.
Figure 12
Tank Drain
Figure 10
NOTICE
Drain liquid from tank daily.
The tank should be carefully inspected at
a minimum of once a year. Look for
cracks forming near the welds. If a crack
is detected, remove pressure from tank
immediately and replace.
Straight Edge
Parallel With Belt
Touch Rim in
Two Places
6. Use a gear puller to move the pulley
on the shaft and tighten fasteners.
7. Adjust brace and reinstall.
Figure 13
Figure 11
Storage
Filter Removal, Inspection and Replacement
1. When not in use, hose and compres-
sor should be stored in a cool, dry
place.
To change a filter, pull off the filter housing
cover. If filter element is dirty, replace ele-
ment or entire filter.
2. Tanks should be drained of moisture.
Hose should be disconnected and
hung with open ends down to allow
any moisture to drain.
14
15
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Troubleshooting
TROUBLE
PROBABLE CAUSE
REMEDY
Overheating
1. Poor ventilation
1. Relocate the compressor
to an area where an ample
supply of cool, clean, dry
and well-circulated air is
available
!
WARNING
For your own safety do not try
and run the air compressor
while troubleshooting.
2. Dirty cooling surfaces
2. Clean the cooling surfaces
of pump and motor/engine
Excessive belt wear
1. Pulley out of alignment
2. Belt too loose or too tight
3. Belt slipping
1. Realign engine pulley with
compressor pulley
2. Adjust tension (See Drive
Belt Section)
TROUBLE
PROBABLE CAUSE
REMEDY
Low discharge pres-
sure
1. Air leaks
1. Listen for escaping air.
Apply soap solution to all
fittings and connections.
Bubbles will appear at
points of leakage. Tighten
or replace leaking fittings
or connections
2. Remove head and inspect
for valve breakage, weak
valves, scored valve seats,
etc. Replace defective
parts and reassemble
3. Adjust tension or replace
belt (See Drive Belt
Section)
4. Check for worn crankshaft,
keyway or pulley bore
resulting from running the
compressor or motor with
loose pulleys. Check for
bent pulleys or bent crank-
shaft
4. Pulley wobbles
2. Leaking valves
!
CAUTION
Unit stalls
1. Low engine idle
1. Increase idle, refer to
engine manual for details
2. See LUBRICATION, under
Assembly
3. Check oil level. Fill if nec-
essary
Be sure that the old head
gasket is replaced with a
new one each time the
head is removed
2. Improper lubrication
3. Low oil level
3. Restricted air intake
4. Slipping belts
3. Clean the air filter element
4. Loosen engine clamping
bolts and move the engine
in a direction away from
the compressor, being sure
that the engine pulley is
perfectly aligned with the
flywheel. Tighten engine
clamping bolts. The belt
should deflect about 1/2”
under 5-lbs of force. Do
not “roll” belts over pulleys
5. Replace any gaskets
proven faulty on inspection
6. Low pressure can be due
to worn rings and cylinder
walls. Correction is made
by replacing the rings,
4. Defective unloader valve
4. Replace
Excessive noise
(knocking)
1. Loose engine or com-
pressor pulley
1. Loose engine or compres-
sor pulleys are a very com-
mon cause of compressors
knocking. Tighten pulley
clamp bolts and set-screws
2. Check for proper oil level; if
low, check for possible
damage to bearings. Dirty
oil can cause excessive
wear
3. Replace connecting rod
4. Remove piston assemblies
from the compressor and
inspect for excess wear.
Replace excessively worn
piston pin or pistons, as
required
2. Lack of oil in crankcase
5. Blown gaskets
3. Worn connecting rod
4. Worn piston pin bushing
6. Low compression
cylinders, and pistons as
required
16
17
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Troubleshooting
Notes
TROUBLE
PROBABLE CAUSE
REMEDY
Excessive noise
(knocking)
5. Worn bearings
5. Replace worn bearings
and change oil
Continued
6. Piston hitting the valve
plate
6. Remove the compressor
head and valve plate and
inspect for carbon deposits
or other foreign matter on
top of piston. Replace
head and valve plate using
new gasket
7. Noisy check valve
7. Replace
Oil in the discharge
air
1. Worn piston rings
2. Compressor air intake
restricted
1. Replace with new rings
2. Clean filter. Check for other
restrictions in the intake
system
3. Restricted breather
3. Clean and check breather
for free operation
4. Excessive oil in compres-
sor
4. Drain down to full level
5. Wrong oil viscosity
5. Use SAE 30 (ISO 100)
non-detergent compressor
oil
6. Connecting rod out of
alignment
6. Replace rod
18
19
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Repair Parts
Repair Parts
For Repair Parts, Call 1-800-4-RIDGID
Please provide following information:
-Model number
-Serial number (if any)
1
-Part description and number as shown in parts list
Key Part
No Number
Key Part
No Number
26 ST083800AV
32
Descriptons
Belt guard
assembly
Qty
Descriptons
Oil drain
Qty
33
1
BG220900AJ
1
1
2
extension
31
30
2
3
4
5
6
7
ST026200AV
BT023100AV
ST073915AV
ST073916AV
ST070827AV
V-215100AV
Setscrew
Belt
1
1
1
1
4
1
27 VT470000KB
28 ST159001AJ
Pump
1
1
29
28
Compression
assembly
3
Filter assembly
Filter element
Screw
34
20
4
29 VT046300AP
30 PU015900AV
31 PU015400AV
32 KE000900AV
33 ST012200AV
Discharge tube
Flywheel
1
1
1
1
1
35
36
27
Pulley
ASME Safety
valve
5
3/16" Key
26
25
6
8
9
ST183700AV
HF002401AV
Tee fitting
Nipple
1
1
2
2
2
1
4
4
1
Square head
set screw
37
24
23
38
34 BG208800AJ
35 NG002502AV
36 ST70625AV
37 ST011200AV
38 AL014000AJ
Brace assembly
Engine
1
1
4
8
4
10 ST119704AV
11 ST160000AV
12 D-1403
Elbow fitting
Handle grip
Drain valve
Tank
20
19
7
Hex head screw
Washer
8
22
10
21
13 AR052200CG
14 ST158300AV
15 ST116400AV
16 WA005500AV
9
Locknut
Rubber foot
Screw
16
18
10" Pneumatic
wheel
12
11
17 AA021800AV
18 ST073613AV
19 ST128407AV
Axle rod
Plug
1
2
1
13
14
17
Throttle
unloader
15
12
20 CV006404AV
21 GA016705AV
22 WL017600AV
23 GA016709AV
24 HF203300AV
25 ST150100AV
Throttle control
Gauge, left
Regulator
1
1
1
1
2
1
Gauge, right
Coupler
Oil drain cap
20
21
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Notes
Notes
22
23
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RIDGID® AIR COMPRESSOR LIMITED THREE YEAR WARRANTY AND 90-
DAY SATISFACTION GUARANTEE POLICY
This product is manufactured by The Campbell Group under a trademark license from Ridgid, Inc.
All warranty communications should be directed to The Campbell Group, attn: RIDGID air compres-
sor technical service at (toll free) 1-800-4-RIDGID.
90-DAY SATISFACTION GUARANTEE POLICY
During the first 90 days after the date of purchase, if you are dissatisfied with the performance of
this RIDGID air compressor for any reason you may return the air compressor to the dealer from
which it was purchased for a full refund or exchange. To receive a replacement air compressor you
must present proof of purchase and return all original equipment packaged with the original prod-
uct. The replacement air compressor will be covered by the limited warrant for the balance of the
three-year warranty period.
WHAT IS COVERED UNDER THE LIMITED THREEYEAR WARRANTY
This warranty covers all defects in workmanship or materials in this RIDGID air compressor for the
three-year period from the date of purchase. This warranty is specific to this air compressor.
Warranties for other RIDGID products may vary.
HOW TO OBTAIN SERVICE
To obtain service for this RIDGID air compressor you must return it, freight prepaid, to a service
center authorized to repair RIDGID air compressors. You may obtain the location of the service cen-
ter nearest you by calling (toll free) 1-800-4-RIDGID or by logging on to the RIDGID website at
mentation, which includes a date of purchase. The authorized service center will repair any faulty
workmanship, and either repair or replace any defective part, at our option at no charge to you.
WHAT IS NOT COVERED
A. Implied warranties, including those of merchantability and FITNESS FOR A PARTICULAR PUR-
POSE ARE LIMITED FROM THE DATE OF ORIGINAL PURCHASE AS STATED IN THE DURATION. If
this compressor is used for commercial, industrial or rental purposes, the warranty will apply for
ninety (90) days from the date of purchase. Extreme Duty Contractor Compressors are not limited
to a ninety (90) day warranty when used in contractor applications. Four cylinder single-stage and
two-stage compressors are not limited to a ninety (90) day warranty when used in commercial or
industrial applications. Some States do not allow limitations on how long an implied warranty
lasts, so the above limitations may not apply to you.
B. ANY INCIDENTAL, INDIRECT, OR CONSEQUENTIAL LOSS, DAMAGE, OR EXPENSE THAT MAY
RESULT FROM ANY DEFECT, FAILURE, OR MALFUNCTION OF THE CAMPBELL HAUSFELD PROD-
UCT. Some States do not allow the exclusion or limitations of incidental or consequential dam-
ages, so the above limitation or exclusion may not apply to you.
C. Any failure that results from an accident, purchaser’s abuse, neglect or failure to operate products
in accordance with instructions provided in the owner’s manual(s) supplied with compressor.
D. Pre-delivery service, i.e. assembly, oil or lubricants, and adjustment.
E. Items or service that are normally required to maintain the product, i.e. lubricants, filters and gas-
kets, etc.
F. Gasoline engines and components are expressly excluded from coverage under this limited war-
ranty. The Purchaser must comply with the warranty given by the engine manufacturer which is
supplied with the product.
G. Additional items not covered under this warranty:
1. All Compressors
• Any component damaged in shipment or any failure caused by installing or operating unit
under conditions not in accordance with installation and operation guidelines or damaged by
contact with tools or surroundings. • Pump or valve failure caused by rain, excessive humidi-
ty, corrosive environments or other contaminants. • Cosmetic defects that do not interfere
with compressor functionality. • Rusted tanks, including but not limited to rust due to
improper drainage or corrosive environments. • Electric motors, check valves and pressure
switches after the first year of ownership. • Drain cocks. • Damage due to incorrect voltage
or improper wiring. • Other items not listed but considered general wear parts. • Pressure
switches, air governors and safety valves modified from factory settings.
2. Lubricated Compressors
• Pump wear or valve damage caused by using oil not specified. • Pump wear or valve dam-
age caused by any oil contamination or by failure to follow proper oil maintenance guidelines.
3. Belt Drive / Direct Drive / Gas Driven Compressors
• Belts. • Ring wear or valve damage from inadequate filter maintenance. • Manually adjust-
ed load/unload and throttle control devices.
ADDITIONAL LIMITATIONS
To the extent permitted by applicable law, all implied warranties, including warranties of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE, are disclaimed. Any implied warranties, including warranties of merchantability or fitness
for a particular purpose, that cannot be disclaimed under state law are limited to three years from the date of purchase.
The Campbell Group is not responsible for direct, indirect, incidental or consequential damages. Some states do not allow
limitations on how long an implied warranty lasts and/or do not allow the exclusion or limitation of incidental or conse-
quential damages, so the above limitations 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.
QUESTIONS OR COMMENTS
CALL 1-800-4-RIDGID
Please have your Model Number and Serial Number on hand when calling.
© 2003 RIDGID, INC.
Part No. ###
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Printed in U.S.A. 12/03
Form No. ###
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