Gearmore GHF90 Guide

HAMMER KNIFE
HEAVY DUTY
SHREDDER
Operation, Service,
& Parts Manual
For Models:
GHF90, 100, & 140
March 2006
FORM: GHFMower.QXD

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Pre-operation Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Shredder Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 6
Roller Height Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Drive Belt Tension Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Deck Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 11
A-frame Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 - 13
Rotor Shaft Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 - 15
Roller Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Gearbox Assembly (540 RPM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 - 19
Gearbox Assembly (1000 RPM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 - 21
Driveline Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 - 23
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
TABLE OF CONTENTS
Date of Purchase:__________________________
Model Number:____________________________
Serial Number:____________________________

INSTALLATION
Page 1
BEFORE ATTACHING THE SHREDDER TO THE TRACTOR
1. Make sure that the shredder is suitable for your tractor's horsepower.
YOUR TRACTOR's
MODELS MAX. H.P.
All Models with 540 RPM gearbox 100 HP
All Models with 1000 RPM gearbox 120 HP
CAUTION: Please note that if these limits are exceeded, it will
invalidate your warranty.
2. Make sure the lower links and top link on the 3-point hitch arms of your tractor are
the correct size (Cat. 2 only), so that they correspond to the size of the hitch on the
shredder you have purchased.
3. Verify that the hitch assembly is mounted in the correct position for the shredder's
application. (front or rear mounted ontractor)
4. P.T.O. Installation:
First, connect the P.T.O. shaft to the tractor. With the shaft in its shortest position,
there should be about a 2" clearance between the end of the gearbox shaft and the
end of the P.T.O. shaft. Should it be necessary to shorten the P.T.O. shaft, shorten
both male and female shafts equally, keeping the protective tube covers 1" shorter
than the steel tubes.
Particular attention should be given to carefully removing all burrs and to clean and
lubricate the steel tubes and protective covers. There must be sufficient telescopic
movement so that the two tubes do not touch the end of the P.T.O. shaft.
It is most important to carefully raise and lower the shredder with the tractor hydraulic
system, making sure that the P.T.O. shaft does not bottom or disengage the telescopic
shaft tubes, otherwise damage may occur.

SAFETY INFORMATION
Page 2
OPERATIONAL SAFETY:
Guards and safety shields are for your
protection. DO NOT operate equipment
unless they are in place.
Always operate tractor PTO (power-take-off)
at recommended RPM (revolutions per
minute).
Disengage tractor PTO and shift into neutral
before attempting to start engine.
Read and observe all safety decals on the
tractor and shredder.
NEVER allow anyone within 25' of
machine while it is in operation.
DO NOT stop or start suddenly when
going uphill or downhill. Avoid operation
on steep slopes.
Be alert for holes in terrain and other hidden
hazards. Always drive slowly over rough
ground.
Reduce speed on slopes and in sharp turns
to prevent tipping or loss of control. Be
careful when changing direction on slopes.
Stop shredder and tractor immediately upon
striking an obstruction. Turn off engine,
inspect shredder and repair any damage
before resuming operation.
Disengage power to shredder and stop
engine before dismounting from tractor,
before making any repairs or adjustments,
transporting or unclogging shredder.
Take all possible precautions when leaving
tractor unattended: Disengage PTO, lower
shredder, shift into neutral, set parking
brake, stop engine and remove key from
ignition.
Front tractor weights or front tire ballast
should be used to enhance front end
stability on small tractors.
Check to make sure PTO is properly
connected and that the driveline is correct
to prevent bottoming out or pulling apart
during the full lift range of the hitch.
This implement is designed for a one-man
operation. It is the responsibility of the
tractor operator to see that no one is in the
proximity of the implement when it is
started. DO NOT operate the implement
with another person within 25' of the
implement.
NEVER operate shredder with hatch in
the wrong working position.
NEVER run shredder with rotorshaft out
of balance.

LUBRICATION
Page 3
Grease all fittings according to the following schedule:
1. ROLLER (Ref. 1): Grease at both ends after 4 hours of operation, until grease is visible..
2. CUTTING SHAFT (Ref. 2): Grease at both ends lightly after 8 hours of operation.
DO NOT overgrease.
4. EXTENSION SHAFT (Ref. 3): Grease extension shaft bearing every 40 hours.
3. P.T.O. SHAFT: The universal joints and overrunning clutch (option) need to be greased
every 8 hours. The telescopic tubes should be greased every 16 hours and the shield
retaining bearing should be greased every 40 hours.
Ref. 3
Ref. 2
Ref. 1

PRE-OPERATION CHECK
Page 4
DCheck tightness of all bolts and nuts.
DCheck gearbox oil level (Grade SAE80W-90 gear oil).
DGrease all points, on all GHF mowers.
DP.T.O. (power take-off) speed should not exceed shredder's rated RPM (revolutions per
minute).
DCheck correct length of P.T.O. shaft. When fitted, there should be 3 3/4" free travel on
male and female tubing (check in fully raised and fully lowered positions).
DThe recommended cutting height, with the hammer or blade in its lowest position, is
between 2" and 4" (Ref. 1). Basically, the fine height adjustment is achieved with the top
link of the 3-point hitch. For a greater height adjustment, it is necessary to raise or lower
the roller (Ref. 2).
DDrive belt should flex 3/8" (1 cm.) when pushed firmly with the finger.
DShredder should be completely cleaned after use and before storage.

SHREDDER ADJUSTMENTS
Page 5
FOR VARIOUS TYPES OF MOWING
There is an adjustable rear hatch (Fig. 3) that can be set in one of seven
positions to control the amount of power needed to do the work.
FOR BEST MOWING OPERATION, OPEN REAR HATCH FULLY
TO ALLOW MATERIAL TO EXIT
1. Adjustment of the rear hatch can be made by removing the
two bolts at the side (Fig. 13, ref. 1). Loosen the nut (Fig.
13, ref. 2) until the hatch can be pivoted around bolt (Fig.
13, ref. 3). To fix the hatch in the desired position, align the
hole in the side of the casing of the machine with the appro-
priate hole in the hatch. Insert the bolt and tighten the self-
locking nut (Fig. 13, ref. 1). Tighten the pivot bolt (Fig. 13,
ref. 3) with the self-locking nut (Fig. 13, ref. 2).
2. The rear hatch should be in a completely closed position
(Fig. 4) when used for mulching of prunings, or pulverizing debris.
3. The hatch is used in position (Fig. 5) to allow the grass clippings to escape above
the roller.
4. The hatch should be in a completely open position when the shredder is used for cutting
grass, vegetables, corn stalk and cotton cutting operations (Fig. 6). An open hatch enables
the clippings to be discharged quickly, thus allowing a faster mowing speed and lower H.P.
requirements.
DANGER: When the hatch is in the fully open position, objects may be thrown
out of the machine. Make sure that NO ONE is in the operation area.

SHREDDER ADJUSTMENTS
Page 6
1. Various roller
adjustments
3 positions
2. Used for mulching
of prunings
3. Used for cutting
grass
4. Used to mulch
cornstalk

ROLLER HEIGHT CONTROL
Page 7
The roller can be adjusted for 2 or 3 cutting heights. By raising the roller, you get a shorter cut, by
lowering it, a longer cut is achieved. You can also fine adjust the cutting height with the top link
arm. By shortening the link arm, your cut is further from the ground.
A suggested cutting height is having the hammer tips about 2" from the ground.
You can control the power needed and the amount of wear on the hammers by this adjustment.
ADJUSTING REAR ROLLER:
To adjust roller, loosen (Fig. 1, ref. 1). Completely remove
(Fig. 1, ref. 2 &3). Align the appropriate hole in the support
bracket with the hole in the deck to achieve roller position
desired.
1. There is also an adjustment that can be made on the roller to control mulch size and
power needed. By moving the roller toward the cutting shaft (Fig. 7), a finer mulch is
produced, requiring less H.P. In this case, we suggest opening the hatch to cut grass,
vegetables, cornstalk, cotton, etc.
2. By moving the roller away from the cutting shaft (Fig. 7), a coarser mulch is produced,
requiring more H.P. In this case, we suggest closing the hatch to mulch prunings.
3. For more precise work and performance, we recommend spending 5 minutes adjusting
your shredder for the job, this can be done according to the previous recommendations.
4. The roller scraper can be removed when cutting grass, because close positioning of the
roller to the cutting shaft permits the hammers to act as a roller cleaning device.

DRIVE BELT TENSION ADJUSTMENT
Page 8
1. Check belt tension before each use (Fig. 8). The tension is correct when you can depress
one belt 1 cm (3/8") between the two pulleys. It is possible for you to insert a tool through
the belt cover (Fig. 9), with shredder stopped, to check the tension.
2. To adjust the belt tension, loosen bolts 1, 2, 3 & 4and locknut 6 (Fig. 9). To adjust tension,
move bolt 5. Do not forget to tighten all bolts after correct belt tension is achieved. If a belt
requires replacement, replace all other belts as well.

TROUBLESHOOTING
Page 9
1. Cutting shaft does not rotate properly:
a. Tighten drive belts to correct tension (see page 8).
b. Replace belts if they no longer can be adjusted properly.
2. Shredder vibrates:
a. Check for loose or missing hammers or bolts.
b. Check for hammers that are unevenly worn. If one or more hammers is badly worn,
replace all the hammers the first time. Keep the hammers that are in good shape for
future replacement in worn series of hammers. For example: when replacing a worn
hammer, replace it with a hammer of similar shape and weight. This will insure a
balanced and vibration free cutting.
3. If the cutting shaft becomes jammed, reverse the rotation of the shaft to loosen and release
the obstruction.
4. If the hammer mounting ears break off, they must be welded back in their exact position,
otherwise the cutting shaft will be unbalanced.
5. If you have any questions or problems, it is always best to contact your dealer immediately.
6. When ordering spare parts, you must contact your authorized Gearmore dealer for original
replacement parts. When doing so, please include the following information:
a. Model Number
b. Serial Number
SAFETY PRECAUTIONS
1. All adjustments, inspections and repairs must be made with tractor and shredder completely
stopped.
a. When the shredder is in operation, make sure that there is no one near the flying
debris from the shredder, to prevent the possibility of serious injuries.
b. ALWAYS keep hands and feet away from a shredder that is in operation.
c. Check that all guards and safety features are in place and in good operating condition.
2. While mowing, take the necessary precautions to insure operator's and others safety.
3. DO NOT make height adjustment using only the top link. This will cause flying debris to
come out the front of the shredder and toward the operator. Use the roller adjustment.
We thank you again for your choice of shredders and we remind you that the safety points outlined in
this manual will help you do your work in a safe and efficient manner.

GHF DECK ASSEMBLY
Page 10

GHF DECK ASSEMBLY
Page 11
REF# QTY. PART NO. DESCRIPTION
1 1 14301033 Deck Frame GHF90
1 1 14301034 Deck Frame GHF100
1 1 14301035 Deck Frame GHF110
1 1 14301036 Deck Frame GHF120
2 1 13008021 Grass Hatch GHF90
2 1 13008022 Grass Hatch GHF100
2 1 13008023 Grass Hatch GHF110
2 1 13008024 Grass Hatch GHF120
3 1 14310001 Belt Cover Plate
4 1 14301040 Plate
5 1 14310003 Plate
6 1 14310007 Support Plate
7 1 14310006 Rubber Shield
8 As Req'd 14310004 Deflector Chain
9 1 19410014 Rod, Deflector Chain
10 5 96607521 Bolt M10 x 20
11 5 97494931 Lock Washer
12 1 96601321 Bolt M10 x 60
13 1 96979671 Lock Nut M1
14 4 96607621 Bolt M10 x 25
15 4 97095111 Washer
16 4 97971821 Lock Nut M10
17 12 96617221 Bolt M20 x 50
18 12 97096011 Washer 21 x 37
19 12 97972821 Lock Nut M20
20 4 96605921 Bolt M8 x 40
21 4 97494831 Lock Washer
22 4 97971721 Lock Nut M8
23 2 96695721 Allen Head Bolt M14 x 40
24 4 97495131 Lock Washer
25 6 97972321 Lock Nut M14
26 4 96612421 Bolt M14 x 40
27 2 97095511 Washer

GHF A-FRAME ASSEMBLY
Page 12

GRF A-FRAME ASSEMBLY
Page 13
REF# QTY. PART NO. DESCRIPTION
1 1 13004088 A-Frame
2 1 19704010 Support, P.T.O.
3 1 96689323 Bolt M6 x 25
4 2 96618421 Bolt M20 x 150
5 2 97096011 Washer
6 2 97972821 Lock Nut
7 1 14311003 Stand
8 1 14311001 Cap, Plastic
9 1 14311010 Pin w/Chain
10 1 97486611 Bolt M6.3 x 19
11 1 14311006 Support
12 1 19404015 Pin w/Chain
13 2 19704013 Lift Pin
14 2 96601821 Bolt M10 x 45
15 2 97971821 Lock Nut
16 2 96619221 Bolt M16 x 45
17 2 97972521 Lock Nut

GHF ROTOR SHAFT ASSEMBLY
Page 14

GHF ROTOR SHAFT ASSEMBLY
Page 15
REF# QTY. PART NO. DESCRIPTION
1 1 14302028 Complete Rotor GHF90
1 1 14302029 Complete Rotor GHF100
1 1 14302030 Complete Rotor GHF110
1 1 14302031 Complete Rotor GHF120
2 As Req'd 48020002 Hammer Knife
3 As Req'd 13002076 Special Lock Nut M16
4 As Req'd 13002075 Bolt M16 x 1.8 x90
5 1 19702057 Bearing Support Assy LH
6 1 19702058 Bearing Support Assy RH
7 2 97036711 Grease Zerk M8
8 1 96868076 Circlip 55 x 2
9 1 19702056 Spacer
10 2 97284280 O-Ring
11 2 80X120X13 Oil Seal 80 x 120 x 13
12 1 96876276 Circlip 120 x 4
13 2 19702054 Support Hub
14 16 96615021 Bolt M16 x 60
15 16 97495231 Lock Washer
16 2 22311 Bearing
17 1 98048716 Spacer 100 x 120 x 3
18 2 65X100X12 Oil Seal
19 1 19702055 Spacer
20 1 14302002 Hex Flail Ear
21 1 14302001 Flail Ear

GHF ROLLER ASSEMBLY
Page 16
REF# QTY. PART NO. DESCRIPTION
1 1 14305002 Complete Roller Assy. GHF90
1 1 14305003 Complete Roller Assy. GHF100
1 1 14305004 Complete Roller Assy. GHF110
1 1 14305005 Complete Roller Assy. GHF120
2 2 13005071 Roller Support
3 2 14305028 Bearing Hub Support
4 2 UK209 Bearing
5 2 14305043 Nut H309
6 2 14310013 Bearing Cover
7 2 14305024 Flange
8 8 96602921 Bolt M18 x 55
' 9 8 97972921 Lock Nut M18
10 8 97095911 Washer
11 2 97036611 Grease Zerk M6

GHF DRIVE ASSEMBLY
Page 17
REF# QTY. PART NO. DESCRIPTION
1 1 19703010 Gearbox Assy, 540 RPM (no ext. shaft)
1 1 19703009 Gearbox Assy, 1000 RPM (no ext. shaft)
2 2 19703017 Support Bracket
3 2 97095511 Washer 15 x 28
4 10 97095711 Washer 17 x 30
5 1 13003015 Pulley SPB250
6 2 13003006 Taper Lock 45 x 80
7 5 19603001 Belt SPBX1600
8 1 13011003 540 RPM Plate
9 1 13103012 Pulley
10 1 13103006 Support, Extension Tube
11 2 96612521 Bolt M14 x 45
12 2 97038721 Lock Nut M14
13 2 97495131 Lock Washer
14 6 96614521 Bolt M16 x 35
15 1 19703016 Support Plate
16 4 96614621 Bolt M16 x 40
17 4 97495231 Lock Washer
18 1 14310012 Safety Cone
19 3 96605321 Bolt M8 x 12
20 3 97094911 Washer
21 1 13010027 Cover, Input Shaft

GHF 540 RPM GEARBOX ASSEMBLY
Page 18