OWNER
6" and 8"
Chipper
OPERATOR’S
MANUAL
Models
74824
8" 24 HP Chipper with
Hydraulic Feed
72620
6" 20 HP Chipper with
Hydraulic Feed
71620
6" 20 HP Chipper
Crary Company
A Division of TerraMarc Industries
237 12th St. NW • P.O. Box 849
West Fargo, ND 58078-0849
(701)282-5520 • FAX: (701)282-9522
Manual P/N 13987-00
Rev. 02/03
Companion to 13988-00
Limited Warranty
Crary Bear Cat chippers are warranted for 1 year from date of sale for consumers , commercial, or rental
operations.
Within the above stated period, Crary Co. will replace any part(s) found to be defective in material and/or
workmanship, after the receipt of the part in our plant. Labor costs to replace these defective parts will be
paid at a Crary established labor rate and time allowed (flat rate) for repair. All transportation charges
incurred in shipping part(s) are the responsibility of the purchaser.
This warranty is void in the case of accidents, failure to perform normal maintenance, or failure to follow
those instructions listed in the service manual. This warranty is also in lieu of all other expressed warranties
and voids any implied warranty as to the merchantability or fitness of the product for a particular purpose
and of any other obligation on the part of Crary Co. Some states do not allow limitations on how long the
implied warranty lasts, so the above limitation may not apply to you.
This warranty applies only to parts or components that are defective, and does not cover necessary repair
due to normal wear, misuse, accidents, or lack of proper maintenance. This includes belts, pulleys, and
chipper blades. Regular routine maintenance of the unit to keep it in proper operating condition is the
responsibility of the owner.
All warranty repair reimbursable under the Crary Co. warranty must be performed by an authorized Bear
Cat service dealer using Bear Cat approved replacement parts. Repair or attempted repair by anyone other
than an authorized Bear Cat service dealer is not reimbursable under the Crary Co. warranty. In addition,
these unauthorized repair attempts may result in additional malfunction, the correction of which is not
covered by warranty.
Crary Co. is not liable for indirect, incidental, or consequential damages in connection with the use of this
product including any cost or expense or providing substitute equipment or service during periods of
malfunction or non-use.
Some states do not allow the exclusion of incidental or consequential damages, so the above exclusion
may not apply to you. This warranty gives you specific legal rights. You may also have other rights that
vary from state to state.
Be sure to note the serial number in any correspondence with Crary Co. or any authorized Bear Cat dealer.
Crary Company
A Division of TerraMarc Industries
237 12th St. NW • P.O. Box 849
WestFargo, ND58078-0849
(701)282-5520•FAX:(701)282-9522
6" & 8" Bear Cat Chipper Operator’s Manual
II
CONTENTS
SAFETY ..........................................................................................................................................................................1
1.1 THE SAFETY ALERT SYMBOL ................................................................................................................................1
1.2 BEFORE OPERATING .............................................................................................................................................. 1
1.3 BEFORE OPERATING .............................................................................................................................................. 2
1.4 OPERATION SAFETY ...............................................................................................................................................2
1.5 MAINTENANCE AND STORAGE SAFETY ............................................................................................................... 3
1.6 TOWING SAFETY.....................................................................................................................................................3
1.7 BATTERY SAFETY ................................................................................................................................................... 3
ASSEMBLY ....................................................................................................................................................................4
2.1 ASSEMBLING THE MACHINE .................................................................................................................................. 4
2.2 INSTALLING THE BATTERY ......................................................................................................................................5
CONTROLS ....................................................................................................................................................................6
3.1 MACHINE CONTROLS.............................................................................................................................................. 6
OPERATION ................................................................................................................................................................... 7
4.1 STARTING THE MACHINE ........................................................................................................................................ 7
4.2 STOPPING THE ENGINE.......................................................................................................................................... 8
4.3 CHIPPING .................................................................................................................................................................8
4.4 ROTATING THE CHIPPER BASE .............................................................................................................................. 8
4.5 HYDRAULIC FEED OPERATION (MODELS 72620 & 74824) .................................................................................... 9
4.6 CONTROLARM OPERATION (MODELS 72620 & 74824) .........................................................................................9
4.7 HYDRAULIC FEED COMPONENT LOCATIONS (MODELS 72620 & 74824) ............................................................ 9
SERVICE & MAINTENANCE ......................................................................................................................................... 10
5.1 SHARPENING CHIPPER BLADES ......................................................................................................................... 10
5.2 SETTING CHIPPER BLADE CLEARANCE.............................................................................................................. 11
5.3ADJUSTING DRIVE BELTS ..................................................................................................................................... 11
5.4 REPLACING DRIVE BELTS .................................................................................................................................... 12
5.5 CLEARING PLUGGED ROTOR ............................................................................................................................... 12
5.6 REPAIRING OR REPLACING ROTOR BEARINGS.................................................................................................. 13
5.7 GREASEABLE BEARINGS AND PIVOTS .............................................................................................................. 13
5.8 OTHER SERVICE TIPS........................................................................................................................................... 13
5.9 TRAILER SERVICE TIPS ........................................................................................................................................ 13
5.10 HYDRAULIC FLUID (MODELS 72620 & 74824) ..................................................................................................... 14
5.11 PUMP COMPONENT LOCATIONS (MODELS 72620 & 74824) ............................................................................. 14
5.12 HYDROSTATIC PUMP STARTUP PROCEDURE (MODELS 72620 & 74824)........................................................ 14
5.13 HYDRAULIC FEED MAINTENANCE (MODELS 72620 & 74824) ........................................................................... 15
5.14 ADDING HYDRAULIC FLUID........................................................................ .................................................... 15
TROUBLESHOOTING .................................................................................................................................................. 16
6.1 GENERAL TROUBLESHOOTING............................................................................................................................ 16
6.2 HYDROSTATIC PUMP TROUBLESHOOTING (MODELS 72620 & 74824) ............................................................... 17
SPECIFICATIONS ........................................................................................................................................................ 18
7.1 SPECIFICATIONS ................................................................................................................................................... 18
7.2 BOLTTORQUE ....................................................................................................................................................... 19
III
6" & 8" Chipper Bear Cat Operator’s Manual
1
Safety
Section
1.1 THE SAFETY ALERT SYMBOL
This is the safety alert symbol. It is used in this Owner / Operator’s Manual and on your machine
to alert you to potential hazards.
Whenever you see this symbol, read and obey the safety message that follows it. Failure to obey
the safety message could result in personal injury, death or property damage.
Indicates an imminently hazardous situation that, if not avoided, will result in
death or serious injury.
DANGER
Indicates a potentially hazardous situation that, if not avoided, could result in
death or serious injury.
WARNING
CAUTION
Indicates a potentially hazardous situation that, if not avoided, may result in
minor or moderate injury.
4. Familiarize yourself with all of the
safety and operating decals on this
equipment and on any of it’s at-
tachments or accessories.
7. Do not run this equipment in an
enclosed area. Do not operate this
equipment in or near buildings,
windows, or air conditioners.
1.2 BEFORE OPERATING
5. Do not allow children or any per-
son unfamiliar with the use of the
unit to use this machine.
8. If needed, always use an approved
fuel container. Keep open flames,
sparks, smoking materials, and
other sources of combustion away
from fuel.
6. Keep the area of operation clear of
all persons, particularly small chil-
dren. Keep bystanders at least
50 feet (15 meters) away from the
area of operation.
1. Read this Owner / Operator’s
manual. Be completely familiar
with the controls and the proper
use of this equipment.
9. Do not operate this machine if you
are under the influence of alcohol,
medications, or substances that
can affect your vision, balance, and
judgement. Do not operate if tired
or ill. You must be in good health
to operate this machine safely.
2. Before inspecting or servicing any
part of the machine, wait for all
parts to stop moving. Be aware that
rotating parts slow down gradually
after power is stopped.
3. Keep safety decals clean and leg-
ible. Replace missing or illegible
safety decals.
6" & 8" Bear Cat Chipper Operator’s Manual
Page 1
Safety
1.3 BEFORE OPERATING
10. Wear safety glasses at all times
while operating this machine.
11. Use only in daylight or good artifi-
cial light.
cured before starting the machine.
Check all screws, nuts, bolts, and
other fasteners for proper tightness
to ensure everything is in proper
working condition once every 10
hours of operation.
12. Never use without proper guards
in place.
13. Avoid wearing loose fitting cloth-
ing. Never operate this machine
wearing clothing with drawstrings
that could wrap around or get
caught in the machine.
15. Keep all guards, deflectors, and
shields in place and in good work-
ing condition.
16. Do not transport or move machine
while the machine is running.
14. Check that all screws, nuts, bolts,
and other fasteners are properly se-
1.4 OPERATION SAFETY
8. Set up your work site so you are
not endangering traffic and the pub-
lic. Take great care to provide ad-
equate warnings.
3. Shut off machine immediately if the
cutting mechanism strikes any for-
eign object or the machine starts
making an unusual noise or vibrat-
ing. Allow the machine to stop
completely. After machine stops:
WARNING
Material can kickup or shift suddenly
and cause serious injury or death.
Wear eye and hearing protection.
9. Ensure debris does not blow into
traffic, parked cars, or pedestrians.
A. Inspect for damage.
B. Replace or repair any
damaged parts.
C. Check for and tighten any
loose parts.
10. Check the bolts for correct torque
every 10 hours of operation.
DANGER
11. Shut off engine and allow machine
to stop completely before clearing
debris if the machine becomes
clogged.
Keep hands, feet and clothing out of
inlets and discharge openings while
machine is operating to avoid seri-
ous personal injury.
4. Stand clear of the discharge area
when operating this machine.
5. Keep your face and body back from
the feed opening.
1. Do not allow hands or any part of
body or clothing near any moving
part.
6. Do not climb on machine when op-
erating. Keep proper balance and
footing at all times.
2. Exclude pieces of metal, rocks,
bottles, cans, and other foreign ob-
jects from entering the machine.
7. Keep the machine clear of debris
and other accumulations.
Page 2
6" & 8" Bear Cat Chipper Operator’s Manual
Safety
1.5 MAINTENANCE AND STORAGE SAFETY
1. Replace any missing or unread-
2. Store the machine out of reach of
children and where potential fuel
vapors will not reach an open flame
or spark.
NOTE
able safety decals. Refer to the
parts manual for part numbers
when ordering safety decals from
an area Bear Cat dealer.
If equipped, see engine owners
manual or contact the engine manu-
facturer for engine safety instruc-
tions and decals.
3. Allow machine to cool before stor-
ing in an enclosure.
1.6 TOWING SAFETY
1. Rotate the discharge tube to face
the opposite direction of the tow-
ing vehicle before towing. This pre-
vents the discharge tube from pro-
jecting over the trailer wheels and
striking foreign objects.
3. Do not exceed maximum towing
speed, indicated on tire sidewall.
Inflate tires to manufacturers specs
as stated on the tire sidewall.
secure it in the DOWN position be-
fore use.
6. Never allow passengers to ride on
the chipper chute while the vehicle
is moving, whether the chipper is
running or not.
4. Check wheel lug bolts periodically
to ensure they are tight and se-
cure.
2. Connect hitch safety chains.
Tighten and secure trailer hitch
bolts. Do not attempt to tow the
trailer if vehicle is not equipped with
a 2” ball.
7. If applicable, shut off fuel supply
when towing.
5. Make sure the jack stand on trailer
is in the UP position to clear the
ground during towing. Place the
jack stand on a level surface and
1.7 BATTERY SAFETY
1. Improper use and care of the bat-
tery on electric start models can
result in serious personal injury or
property damage. Always observe
the following safety precautions:
ANTIDOTE-Eye Contact: Flush
with water for 15 minutes. Get
prompt medical attention.
Neutralize acid spills with a bak-
ing soda and water solution. Prop-
erly dispose of a damaged or worn-
out battery. Check with local au-
thorities for proper disposal meth-
ods.
3. The battery produces explosive
gases. Keep sparks, flame or
cigarettes away. Ventilate area
when charging battery. Always
wear safety goggles when work-
ing near battery.
2. Poison/Danger - Causes Severe
Burns. The battery contains sulfu-
ric acid. Avoid contact with skin,
eyes or clothing. Keep out of
reach of children.
5. Do not short circuit battery. Se-
vere fumes and fire can result.
6. Before working with electrical wires
or components: disconnect bat-
tery ground (negative) cable first.
Disconnect positive cable second.
Reverse this order when reconnect-
ing battery cables.
4. The battery contains toxic materi-
als. Do not damage battery case.
If case is broken or damaged,
avoid contact with battery contents.
ANTIDOTE-External Contact:
Flush immediately with lots of wa-
ter.
ANTIDOTE-Internal: Drink large
quantities of water or milk. Follow
with milk of magnesia, beaten egg
or vegetable oil. Call a physician
immediately.
DANGER / POISON
FLUSH EYES
IMMEDIATELY
WITH WATER
SULFURIC
ACID
CAN CAUSE
BLINDNESS OR
SEVERE BURNS
EYES
EXPLOSIVE GASES
NO
• SPARKS
• FLAMES
GET
MEDICAL
HELP
FAST
CAN CAUSE
BLINDNESS OR
• SMOKING
INJURY
KEEP OUT OF THE REACH OF CHILDREN. DO NOT TIP. KEEP VENT CAPS TIGHT AND LEVEL.
6" & 8" Bear Cat Chipper Operator’s Manual
Page 3
Assembly
2
Section
2.1 ASSEMBLING THE MACHINE
1. Remove from shipping crate.
flange and tighten the bolts to secure it. Install the
second half of the clamp to the tube and flange. Rotate
the tube 360 degrees and lock it in place with the handle
to make sure it is mounted correctly.
2. Support the frame on wood blocks or other support de-
vice.
3. Mount the two tires and rims to the axle assembly with
the lug nuts (supplied).
7. Install battery. (See Section 2.2)
8. Fill the engine with oil (per instructions in supplied Honda
engine manual) and the gas tank with gasoline.
4. Mount the trailer hitch assembly to the frame using three
3/8 X 3-1/2 inch bolts and locknuts (supplied).
9. Fill the hydraulic reservoir. See Section 5.13 for specific
instructions.
5. Fasten the chipper chute to the main frame mounting
bracket using eight 3/8 X 1 inch bolts and locknuts.
Use three bolts on each side and two on the bottom.
10. Your chipper should be ready to use.
6. Attach the blower discharge tube to the mounting flange
on the chipper frame. Half of the mounting clamp is
already attached to the tube. Slide the tube into the
Fig. #1
Page 4
6" & 8" Bear Cat Chipper Operator’s Manual
Assembly
2.2 INSTALLING THE BATTERY
6. After filling, battery should be charged to the specifica-
tions below and put into service immediately.
1. The machine may or may not have been shipped with a
battery depending on your area. If you did not receive a
battery with your machine, you will need to purchase
one.
• Temperature over 60° F
• 3 amperes for 4 Hours.
• Temperature under 60° F
• 3 amperes for 6 Hours.
2. Use a battery that meets or exceeds the following speci-
fications:
Battery, Category, Lawn and Garden
BCI Group Size U1
200-250 CCA
7. Place charged battery in battery box on chipper shred-
der.
7-3/4” X 5-3/16” X 7-5/16”
8. Remove key from engine ignition.
Suggested Source: Exide Cutting Edge, Type GT-H
9. Install the positive (+) battery cable to the positive (+)
battery terminal using a 5/16 X 1” hex head bolt and 5/
16 nylock nut. An insulating boot is loosely installed
on this cable. Slide the insulating boot over the termi-
nal, making sure that the terminal is completely cov-
ered.
3. If you received a battery with your machine, proceed to
the next step.
NOTE
The battery that was shipped with the machine was
shipped dry. The battery will need to be serviced
before installation.
10. Install the negative (-) cable on the negative (-) battery
terminal using a 5/16 X 1” hex head bolt and 5/16 nylock
nut. There is no insulating boot for this terminal.
4. Remove or destroy any sealing device which may have
been used to close or restrict the vent openings.
IMPORTANT
º
5. Remove battery vent caps and fill cells until baffle
plate is covered with 1.25” of electrolyte at 80° F. Bat-
tery and electrolyte must be at a temperature above
60° F, but should not exceed 100° F.
DO NOTATTEMPT TO STARTTHE ENGINEATTHIS
TIME. Wait until you have read the complete starting
instructions in the Operation Section of this Manual.
11. Secure battery box cover.
WARNING
To avoid sparks and a possible explosion or fire due
to a short circuit:
1. Do not touch the positive (+) battery terminal and
any surrounding metal with tools, jewelry or other
metal objects.
2. When installing battery cables, connect positive
(+) cable first and negative (-) cable last.
6" & 8" Bear Cat Chipper Operator’s Manual
Page 5
Controls
3
Section
3.1 MACHINE CONTROLS
6. Rotor Access Cover: Used to remove chipper blades.
7. Engine Battery: Shipped without battery.
For engine controls and maintenance please refer to the
Honda engine owners manual included with the machine.
1. Engine Fuel Tank: Use unleaded fuel—do not mix with
oil.
8. Clutch Foot Pedal: Used to engage rotor assembly drive
belt.
2. Trailer Hitch: Always use 2 inch ball and safety chains.
9. Adjustable Chipping Anvil.
3. Jack Stand: Always have in UP position and clear from
ground when moving. When is use, place in DOWN
position on a level surface.
CAUTION
4. Engine Drive Belts and Shield: Never remove shields
when in use.
The chipper rotor may continue to rotate even with the
engine stopped. Do not attempt any repair or
adjustments until the entire machine has come to a
complete stop and spark plug wire is removed. Never
operate this machine without all safety shields in place.
5. Chipper Chute: Feed materials to be chipped through
the chute.
Fig. #2
Page 6
6" & 8" Bear Cat Chipper Operator’s Manual
Operation
4
Section
3. Depress foot clutch pedal down, this will disengage drive
belts and enable engine to start.
4.1 STARTING THE MACHINE
4. Refer to Honda engine owners manual for engine star-
ing.
CAUTION
Move machine to a clear, level area outdoors before
starting. Do not operate machine on a paved, concrete,
or gravel surface. Do not operate in the vicinity of
bystanders. Make sure cutting chamber is empty
before starting.
5. Once engine is running and no choke is needed, slowly
let foot clutch pedal up. This will engage drive belt and
the rotor will turn.
6. If engine kills when engaging foot clutch pedal, either
use more choke or increase engine RPM.
7. When clutch is engaged, the foot pedal may vibrate or
shake until the engine and rotor have increased to full
running RPM.
CAUTION
Obtain and wear safety glasses at all times when
operating the machine. Do not wear loose fitting
clothing. The operator should always wear heavy
boots, gloves, pants, and shirt. Use common sense
and practice safety to protect yourself from branches,
sharp objects, and other harmful objects.
8. The chipper frame assembly can turn 360 degrees clock-
wise or counterclockwise. Press down on the foot pedal
located underneath the frame near the tow hitch and
the frame will pivot on the trailer to your desired loca-
tion. Let up on the foot pedal and the frame will lock
into place for use. The discharge tube can also turn 360
degrees to your desired location.
1. Before starting, fill engine with oil to the correct level.
See engine manual for operation and maintenance in-
structions.
NOTE
Some oil usage is normal. Check level with each use.
2. Before starting, fill fuel tank with fresh, clean unleaded
regular gasoline. DO NOT MIX OIL WITH GASOLINE.
WARNING
Handle fuel (gasoline) with care. It is highly flammable.
Always use an approved container and fill tank
outdoors. Never add fuel to a running or hot engine.
6" & 8" Bear Cat Chipper Operator’s Manual
Page 7
Operation
4.2 STOPPING THE ENGINE
3. Refer to Honda owners manual for stopping procedures.
CAUTION
4. Allow machine to come to a complete stop. You may
release the foot clutch pedal to help slow the rotor once
the engine has stopped running.
Obtain and wear safety glasses at all times when
operating the machine. Avoid wearing loose fitting
clothing. Always wear heavy boots, gloves, pants, and
shirt. Use common sense and practice safety to protect
yourself from branches, sharp objects, and other
harmful objects.
NOTE
The heavy rotor will continue to turn for some time
after the engine has been shut off. You can tell that
the rotor has stopped when no noise or machine
vibration is present. Inserting a branch into the
chipper chute to contact the blades will slow the rotor
and shorten stopping time.
1. Move throttle to SLOW position.
2. Depress foot clutch pedal.
4.3 CHIPPING
The Bear Cat chipper is designed to chip a variety of materials
into a more readily decomposing or handled condition. The
following guidelines can be used to help you get started.
2. Place limb, butt end first, into the chipper chute until it
contacts the feed roller. The actual feed rate of the limb
into the chipper depends on the type of material fed and
sharpness of the cutting blades. Operate feed roller at a
rate that will not kill the engine.
WARNING
3. Rotate the branch to improve cutting action.
Keep face and body away from the feed opening. Do not
overreach. Keep proper balance and footing at all times.
4. The chipping blades dull with use and require periodic
sharpening. Refer to Service and Maintenance, "Sharp-
ening Chipper Blades" for instructions.
1. Trim side branches that cannot be bent enough to feed
into the chipper chute. Hold small diameter branches
together in a bundle and feed in simultaneously.
4.4 ROTATING THE CHIPPER BASE
1. Disengage the Chipper LiftArm from the Chipper Base
and then realese it by pressing it down.
2. Rotate the Chipper Base to desired position.
3. Once the Chipper Base has been positioned, lift up the
Chipper Arm and lock it in place.
WARNING
The Chipper Base must always be locked in place.
Failure to do so my result in machine vibration, serious
bodily injury or death.
Fig. #3
Page 8
6" & 8" Bear Cat Chipper Operator’s Manual
Operation
4.5 HYDRAULIC FEED OPERATION MODELS 72620 & 74824
1. Start the chipper engine. Bring the chipper up to operat-
ing speed. See "Operation" section for starting, opera-
tion, and stopping instructions.
3. If the chipper jams, reverse the feed by moving the con-
trol arm in the reverse direction. Remove the branch
and rotate it before reinserting it into the chute again.
2. Engage the hydraulic feed by moving the control arm as
shown below. The feed rate increases as the arm is
moved.
WARNING
Please read and follow all safety instructions in this
manual. Failure to operate the chipper in accordance with
the safety instructions MAY RESULT IN PERSONAL IN-
JURY!
4.6 CONTROL ARM OPERATION MODELS 72620 & 74824
Fig. #4
4.7 HYDRAULIC FEED COMPONENT LOCATIONS MODELS 72620 & 74824
Roller Assembly
Hydraulic
Motor
Chipper
Chute
Reservoir
Crossover
Relief
Valve
Hydrostatic
Pump
Fig. #5
6" & 8" Bear Cat Chipper Operator’s Manual
Page 9
Service & Maintenance
5
Section
5.1 SHARPENING CHIPPER BLADES
WARNING
When the Chipper Blades dull, chipping becomes difficult.
It is recommended that the chipper blades are sharpened
every 5-15 hours of chipper operation.
The rotor assembly has a lock mechanism. When
working on the rotor assembly, use the lock
mechanism at all times. Remove plastic bearing cover
under chipper chute. There is a hole in the rotor jack
shaft and a matching hole in the bracket mounted to
the rotor bearing front side. Install a punch through the
rotor shaft and bracket to lock the rotor in place.
The Chipper Blades are two edged. When the first edge
dulls, flip the blade to use the sharp second edge. After
both edges are dull, sharpen the chipper blades.
Follow the procedure below to remove the chipping blades
for sharpening:
rotor so that the bolts holding the chipper blades are
most accessible (See Fig. #6).
WARNING
3. Remove the two hex head bolts holding the blade itself.
Repeat for all four blades. The four chipping blades have
two edges per blade and can be reversed one time each
before sharpening. Reinstall chipping blades and pro-
ceed with chipping.
Before inspecting or servicing any part of the machine,
shut off the power source, disconnect the spark plug
wire from the spark plug, and make sure all moving
parts have come to a complete stop. The chipping
blades are sharp! Use care when working on machine
to avoid injury.
4. If already reversed, the chipping blades will have to be
ground to a 45 degree angle. Be careful when grinding
so that the blade material does not get too hot and
change color–this will remove the blade's special heat
treated properties. Use short grinding times and cool
with water. Try to remove an equal amount off each blade
to maintain balance.
1. Remove the two 3/8 inch retaining bolts holding the ac-
cess cover to main frame assembly.
2. Tilt access cover over to allow rotor access. Rotate the
5. Replace the chipping blades and tighten bolts to 75 ft.
lbs.
Fig. #6
Page 10
6" & 8" Bear Cat Chipper Operator’s Manual
Service and Maintenance
5.3 SETTING CHIPPER BLADE 5.3 ADJUSTING DRIVE BELTS
CLEARANCE
Check the condition of the drive belt annually or after every
30 hours of operation, whichever comes first. If the belt is
The four edged chipping blades should clear the chipping
cracked, frayed, worn, or stretched, replace it. Only
anvil located directly under the chipper chute by 1/16 inch
replace belt with original branded type belt, do not use
to 1/8 inch. The chipping anvil is adjustable and
single type belts. To adjust the belt, proceed as follows:
reversible.
1. Depress foot clutch pedal. Shut engine off and discon-
1. Lift rotor access cover and expose rotor (See Fig. #7).
nect battery cables.
Loosen the three 1/2 inch bolts that hold the chipper
anvil to the frame.
2. Remove large belt guard (three 5/16 inch bolts).
2. Measure the amount of clearance between chipping
3. Adjust the eyebolt that anchors the idler spring to ad-
blade and chipping anvil from inside of housing.
just belt tension. Tighten the eyebolt until the belt de-
flection at the center of the belt is 7/16" when a 20 lb.
load is placed against the belt (See Fig. # 9).
3. Adjust inward or outward to desired measurement.
4. Tighten bolts on chipping anvil to 75 ft. lbs. and resume
4. Replace belt guard.
operation.
5. Start engine and test belt for looseness.
If chipping anvil edge is damaged or worn unevenly,
remove the three bolts holding the anvil and use one of the
other three edges. Adjust for correct measurement.
Fig. #7
6" & 8" Bear Cat Chipper Operator’s Manual
Page 11
Service and Maintenance
5.4 REPLACING DRIVE BELTS
5.5 CLEARING PLUGGED ROTOR
1. Remove large belt guard (three 5/16" bolts).
WARNING
2. Loosen bolts on hydraulic pump and remove belt, if
equipped.
If the machine becomes plugged, depress the foot
clutch pedal, shut off the engine, disconnect the spark
plug wire, and allow the machine to come to a complete
stop before clearing debris. Do not operate the machine
without proper guards and screens in place.
3. Lift belt idler pulley off drive belt and remove drive belt
from pulleys.
4. Install new belt on pulleys and lower belt idler. Check
alignment of pulleys and adjust if needed.
CAUTION
5. Adjust the eyebolt that anchors the idler spring to ad-
just belt tension. Tighten the eyebolt until the belt de-
flection at the center of the belt is 7/16" when a 20 lb
load is place against the belt (See Fig. #9).
Remember to use rotor shaft lock when working on rotor.
Feeding too large or too much chipable material at once
may plug the chipper. To clear plugged rotor, proceed as
follows:
6. Replace hydraulic pump belt, if equipped. Readjust hy-
draulic pump belt tension by sliding the hydraulic pump
in the mounting slots. Tighten bolts.
1. Depress foot clutch pedal and stop engine. Release
foot clutch pedal when engine is stopped.
7. Replace belt guard.
2. Remove the two 3/8" retaining bolts holding the access
cover to the main frame assembly.
8. Depress foot clutch pedal, start engine, release foot
clutch pedal to engage belt, and test unit. Readjust
pulleys and belt tension if needed.
3. Lift up rotor access cover.
4. Clean the debris out the chipper rotor. Turn the rotor by
hand to be sure it is free to rotate.
7/16"Deflection
5. Close rotor access cover and replace bolts.
6. Depress foot clutch pedal, and start engine. Release
foot clutch pedal when engine is running to engage drive
belt. Resume operation.
Fig.#8
Page 12
6" & 8" Bear Cat Chipper Operator’s Manual
Service and Maintenance
5.6 REPAIRING OR REPLACING RO-
TOR BEARINGS
11. Close cover and replace bolts.
12. Replace belt guard and resume operation.
1. Remove the two 3/8 inch retaining bolts holding access
cover to main frame assembly. Tilt access cover over to
allow rotor access.
13. Depress foot clutch pedal, start engine, release foot
clutch pedal to engage belt, and test unit. Readjust
pulleys and belt tension if needed.
2. Remove large belt guard (three 5/16 inch bolts).
14. On hydraulic units remove hydraulic pump and belts
prior to step 3 and replace prior to step 12.
3. Lift belt idler pulley off drive belt and remove belt from
pulleys. Using the push bolts from the bushing, remove
the bushing and pulley from the rotor shaft.
5.7 GREASEABLE BEARINGS AND
PIVOTS
WARNING
The models have five greaseable bearings and pivots that
require grease every 50 hours:
The rotor assembly has a lock mechanism. When work-
ing on the rotor assembly, use the lock mechanism at all
times. To use, remove plastic bearing cover under the
chipper chute. There is a hole in the rotor jack shaft and a
matching hole in the bracket mounted to the rotor bearing
front side. Install a punch through the rotor shaft and
bracket to lock the rotor in place.
1. Two bearings on the rotor shaft.
2. One greaseable bushing on the foot clutch pedal pivot.
3. One grease zerk on idler pivot.
4. If a rotor bearing needs repair, it is best to remove the
complete rotor assembly from chipper frame.
4. One grease zerk on discharge chute.
5. Using an overhead hoist or lifting device, remove the
four 1/2 inch bolts on each rotor bearing and lift the rotor
assembly completely out of the frame. The complete
rotor assembly weighs 275 lbs.
5.8 OTHER SERVICE TIPS
1. Service engine according to the Honda engine manual.
Change engine oil and filter as recommended in manual.
6. Once the rotor assembly is out of the frame, both bear-
ings can be removed by a puller and replaced on the
shaft.
2. Every 10 hours of operation, all bolts and other fasten-
ers should be checked for correct torque.
7. Use the overhead hoist or lifting device to return the
complete rotor assembly to the chipper frame.
5.9 TRAILER SERVICE TIPS
8. Install the four 1/2 inch bolts on each bearing to secure
them to the frame. Tighten bolts to 75 ft. lbs.
1. Check wheel bolt torque every 10 hours of towing use.
9. Replace drive belt on pulleys and lower belt idler. Check
alignment of pulleys and adjust engine if needed.
2. Check air pressure in tires every 10 hours of towing.
Inflate to pressure marked on sidewall of tire.
10. Check belt tension before start-up. Adjust the eyebolt
that anchors the idler spring to adjust the belt tension.
Tighten the eyebolt until the belt deflection at the center
of the belt is 7/16" when a 20 lb. load is placed against
the belt (See Fig. #8).
3. Check and repack wheel bearings with grease every 12
months.
4. When towing, use a 2 inch trailer ball, and always con-
nect the safety chains. Make sure trailer hitch bolts are
tight and secure.
6" & 8" Bear Cat Chipper Operator’s Manual
Page 13
Service and Maintenance
5.12 HYDROSTATIC PUMP START UP
PROCEDURE (MODELS 72620 &
74824)
5.10 HYDRAULIC FLUID (MODELS
72620 & 74824)
Handle pressurized hydraulic fluid carefully. Escaping
pressurized hydraulic fluid can have sufficient force to
penetrate your skin causing serious injury. This fluid may
also be hot enough to burn. Serious infection or reactions
can develop if proper medical treatment is not
administered immediately.
Follow this start-up procedure when starting a new
installation or when restarting an installation in which the
hydrostatic pump has been removed from the system.
1. Before starting the hydrostatic pump, make sure all
system components (reservoir, fittings, etc.) are clean.
Premium hydraulic fluids containing high quality rust,
oxidation, and foam inhibitors are required. These include
premium turbine oils, API CD engine oils per SAE J183,
M2C33F or G automatic transmission fluids meeting
Allison C-3 or Caterpillar TO-2, and certain specialty
agricultural tractor fluids.
2. Fill the reservoir with recommended hydraulic fluid, which
should be filtered before entering the reservoir.
3. The inlet line leading from the reservoir to the charge
pump must be filled before start-up. Loosen the fitting
on this inlet line until oil bleeds out.
WARNING
5.11 PUMP COMPONENT LOCA-
TIONS (MODELS 72620 & 74824)
Do not start engine unless pump is in neutral position on
the cable.
4. Start the engine and run at the lowest possible RPM.
5. As air is purged from the unit, the oil level in the reser-
voir will drop and bubbles may appear in the fluid. Refill
the reservoir as necessary.
6. Run the unit and move the control arm in both direc-
tions for several minutes until any remaining air is purged
from the unit. Refill the reservoir as necessary.
Fig. #9
7. Check to ensure feed roller stops when control arm is in
the neutral position. Adjust the cable clevis or anchor if
the feed roller doesn't stop.
NOTE
A motor fitting may have to be loosened and oil bled to
remove air from the system (use same procedures as
steps 3-5).
8. Shut down the engine, check for and correct any fluid
leaks, and check the reservoir level. Add fluid if neces-
sary. The hydrostatic pump is now ready for operation.
NOTE
Hydrostatic pressure controlled by the crossover relief
valve is factory set at 1750 PSI.
Page 14
6" & 8" Bear Cat Chipper Operator’s Manual
Service and Maintenance
2. Fill the reservoir with recommended hydraulic fluid.
(Note: The hydraulic fluid must be filtered before before
entering the reservoir)
5.13 HYDRAULIC FEED MAINTE-
NANCE (72620 & 74824)
3. The inlet line leading from the reservoir to the charge
pump must be filled before start-up. Loosen the fitting
at the pump on the inlet line until oil bleeds out.
CAUTION
Before servicing or repairing any of the hydrostatic feed
components (pump, motor, and/or relief valve), contact
your dealer or factory service department. Warranty on
these items may be void without prior authorization.
4. Start the engine and run at the lowest possible RPM.
5. Loosen the motor fittings until oil bleeds out to remove
air from the system. Retighten fittings.
6. As air is expelled from the unit, the oil level in the reser-
voir drops down and bubbles may appear in the fluid.
Refill the reservoir as necessary.
CAUTION
Hydraulic systems contain fluid under high pressure.
Never check for leaks with your hands. Relieve pres-
sure before disconnecting any hydraulic lines.
7. Run the feed roller in both directions for several minutes
until any remaining air is completely expelled from the
unit. Refill the reservoir as necessary.
8. Shut down the engine, check and correct any fluid leaks.
check. Check the reservoir level and add fluid if neces-
sary. The hydrostatic pump is now ready for operation.
The hydrostatic pump normally does not require regular
fluid changes. The system filter should be changed at 250
hour or annual intervals. The fluid and filter should be
changed and system cleaned if the fluid becomes
contaminated with foreign matter (water, dirt, grease, etc.)
or if the fluid has been subjected to temperature levels
greater than the maximum recommended.
There is a greaseable bearing on each side of the main
jack shaft on the main hydraulic feed housing. Grease
periodically.
5.14 ADDING HYDRAULIC FLUID
Hydraulic fluid is used to drive the feed roller. The
hydraulic pump is attached to the motor (diesel models)
or connected to the motor with a belt (gasoline models).
Premium hydraulic fluids containing high quality rust,
oxidation, and foam inhibitors are required. These include
premium turbine oils, API CD engine oils per SAE J183,
M2C33F or G automatic transmission fluids meeting
Allison C-3 or Caterpillar TO-2, and certain specialty
agricultural tractor fluids.
Below are the necessary startup procedures:
1. Before starting the hydrostatic pump, make sure all sys-
tem components (reservoir, fittings, etc.) are clean.
6" & 8" Bear Cat Chipper Operator’s Manual
Page 15
Troubleshooting
6
Section
6.1 GENERAL TROUBLESHOOTING
Problem
Probable Cause
Obstructed discharge
Plugged rotor
Suggested Remedies
Use branch or similar object
to clear discharge
Rotor does not turn
Clear rotor
Use branch or similar object
to clear discharge
Obstructed discharge
Hard to feed chipper or
excessive power needed
to chip
Dull chipper blades
Sharpen blades
Adjust clearance
Improper blade clearance
Use branch or similar object
to clear discharge
Obstructed discharge
Plugged rotor
Clear rotor, feed material into
shredder more evenly
Chipper requires
excessive power or stalls
Green material will not
discharge
Alternately feed dry material,
or allow material to dry
Plugged rotor
Clear rotor
Drive belts squealing or
smoking
Adjust belt tension or replace
belts if needed
Loose or worn belts
Check drive belts and pulleys
for bad or worn spots
Drivehead vibration
Inspect rotor for broken or
missing chipper blades and
paddles. Repair if needed.
Check rotor to see if it
wobbles. Check to see if the
rotor is assembled correctly
Vibration while running
Rotor out of balance
Engine problems
Engine dies or runs
poorly
Contact local Honda dealer
Page 16
6" & 8" Bear Cat Chipper Operator’s Manual
Troubleshooting
6.2 HYDROSTATIC PUMP TROUBLESHOOTING MODELS 72620 & 74824
Symptom
Probable Cause
Suggested Remedy
Engine not operating at correct
speed.
Repair engine governor
Control linkage damaged or
binding.
Repair control linkage.
Will not attain normal feed rate
Bypass valve stuck partially
open. (Problem in one direction
only.)
Repair bypass valve. Remove
foreign material from valve.
Control linkage damaged or not Repair or reconnect control
connected
linkage
Repair drive (replace broken
belt, repair sheared key, repair
splined coupling, etc.
Will not feed when control arm
is moved
Drive between engine and
pump damaged
Refill reservoir. Purge air from
transmission.
Pump low on fluid.
Loose belt between engine and Tension drive belt (replace if
pump.
necessary).
Refill reservoir. Purge air from
transmission.
Pump low on fluid.
Feed rate is sluggish under
load
Large amount of water in
hydraulic fluid (evaporates
when hot resulting in low fluid
level).
Drain fluid from reservoir and
unit, replace filter element, and
refill with new fluid.
Check relief pressure in
system with a pressure gauge
rated to 2500 psi. (System set
by factory at 1750 psi.)
Hydraulic feed will not pull in Hydraulic system overloading
logs over 4" in diameter, or
continuously stalls or stops
and causing system to go over
relief.
6" & 8" Bear Cat Chipper Operator’s Manual
Page 17
Specifications
7
Section
7.1 SPECIFICATIONS
Model
Specifications
71620
Model
72620
Model
72824
Overall size
76x80x90" 93x80x90" 93x80x90"
(LxWxH)
Max. Chipper
Capacity
6"
4
6"
4
8"
4
Chipper Blade
Qty.
Reversible Reversible Reversible
Tool Steel Tool Steel Tool Steel
1500 RPM 1500 RPM 1500 RPM
Rotor Speed
Rotor Size
30" Dia. X 30" Dia.x 30" Dia. X
1.25"
1.25"
1.25"
Rotor Weight
Rotor Shaft
Diameter
275 lbs.
275 lbs.
275 lbs.
1.75
1.75
1.75"
Discharge Size
Drive Type
8"
Belt
8"
Belt
8"
Belt
Belt Size
3B83
3D83
3B83
Weight
Wheel Base
Tire Size
1445
66"
1865
66"
1870
66"
5.31-12
5.31-12
5.31-12
Fuel Tank Cap.
(Gal.)
6
6
6
Honda 20 Honda 20 Honda 24
HP HP HP
Engine
Specifications are subject to change because of design
modifications.
Page 18
6" & 8" Bear Cat Chipper Operator’s Manual
Specifications
7.2 BOLT TORQUE
CHECKINGBOLTTORQUE:
The tables shown below give correct torque values for various bolts and capscrews. Tighten all bolts to the torques specified
in chart unless otherwise noted. Replace hardware with the same strength bolt.
SAE - 2
SAE - 5
SAE - 8
A
ENGLISH
TORQUE
Bolt Torque*
Bolt
Diameter
SAE 5
SAE 2
SAE 8
1/4”
5/16”
3/8”
9.5
25
44
7.5
15
27
5.5
11
20
9
18
33
17
35
63
12.5
26
46
7/16”
1/2”
9/16”
5/8”
3/4”
7/8”
1”
1-1/8”
1-1/4”
70
44
67
95
135
240
240
360
510
725
32
50
70
100
175
175
270
375
530
52
80
115
160
280
450
100
150
225
300
550
875
75
110
155
215
375
625
925
1150
1650
115
160
225
400
650
975
675 1300
850 1850 1350
1200 2600 1950
A
METRICTORQUESPECIFICATIONS
Bolt
Diameter
Bolt Torque*
4.8
8.8
10.9
12.9
M3
M4
M5
.5
3
5
.4
2.2
4
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
M6
M8
6
15
29
50
4.5
11
21
37
60
11
28
55
95
150
240
330
475
650
825
1200
8.5
20
40
17
40
80
12
30
60
19
47
95
14.5
35
70
M10
M12
M14
M16
M18
M20
M22
M24
M27
70
140
225
350
475
675
925
1150
1700
105
165
255
350
500
675
850
1250
165
260
400
560
800
1075
1350
2000
120
190
300
410
580
800
1000
1500
80
110
175
250
350
475
600
875
125
175
240
330
425
625
92
125
180
250
310
450
Torque figures indicated above are valid for non-greased or non-oiled threads and heads unless otherwise specified. Therefore, do not grease or
oil bolts or capscrews unless otherwise specified in this manual. When using locking elements, increase torque values by 5%.
*
Torque value for bolts and capscrews are identified by their head markings.
6" & 8" Bear Cat Chipper Operator’s Manual
Page 19
Crary Company
A Division of TerraMarc Industries
237 12th St. NW • P.O. Box 849
WestFargo, ND58078-0849
(701)282-5520•FAX:(701)282-9522
Manufactured in the
United States of America
by Crary Company
Kawasaki
Ride on lawn
mowers
Electric Garden
Shredders
Petrol Garden
shredders
Cheap Garden
Green house
heaters
Gas Greenhouse
heaters
Stainless Steel Patio
Heaters
Christmas Gardening
Patio Heaters with
Covers
Gifts
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