KUHN GMD44 User manual

ASSEMBLY / OPERATOR'S MANUAL
GMD 44 / 55 / 66 SELECT
MULTIDISC MOWER
N° 95011 A.GB - 07.98

DEAR OWNER,
In buying a KUHN machine you have chosen wisely. In o i have gone years of hough ,
research and improvemen s. You will find, as have housands of owners all over he world, ha
you have he bes ha engineering skill and ac ual field es ing can produce. You have
purchased a dependable machine, bu only by proper care and opera ion can you expec o
receive he performance and long service buil in o i .
This manual con ains all he necessary informa ion for you o receive full efficiency from your
machine. The performance you ge from his machine is largely dependan upon how well you
read and unders and his manual and apply his knowledge. Please DO NOT ASSUME THAT
YOU KNOW HOW TO OPERATE AND MAINTAIN YOUR MACHINE before reading his
manual carefully. KEEP THIS MANUAL AVAILABLE FOR REFERENCE.
Your KUHN dealer will ins ruc you on he general opera ion of your machine. He is in eres ed
ha you ge he bes performance possible and will be glad o answer any special ques ions
ha may arise regarding he opera ion of he KUHN machine.
Your KUHN dealer can offer a comple e line of genuine KUHN service par s.
These par s are manufac ured and carefully inspec ed in he same fac ory ha builds he
machine o assure high quali y and accura e fi ing of any necessary replacemen s.
When ordering service par s i is impor an ha you indica e he ype of machine concerned
and i s serial number.
For his reason please comple e he model iden ifica ion pla e diagram below wi h he required
informa ion. This will provide you wi h an easy reference for fu ure service par s orders.
ABOUT IMPROVEMENTS
KUHN is con inually s riving o improve i s produc s and, herefore, reserves he righ o make
improvemen s or changes when i becomes prac ical o do so, wi hou incurring any
obliga ions o make changes or addi ions o he equipmen sold previously.

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CONTENTS
Page
Safety _________________________________________________ 2
Safety decals ___________________________________________ 9
Technical specifications __________________________________ 11
General information _____________________________________ 11
Assembly _____________________________________________ 12
Adapting to the tractor ___________________________________ 18
P.T. . shaft ___________________________________________ 20
Transport _____________________________________________ 21
Lowering the cutterbar and adjustments for work ______________ 22
perating the mower ____________________________________ 24
Parking the machine _____________________________________ 25
Lubrication ____________________________________________ 26
Adjustments and maintenance _____________________________ 28
Inspection of knives & securing elements ____________________ 30
ptional equipment _____________________________________ 32
Storing the mower ______________________________________ 35
Service adjustment chart _________________________________ 36
Limited warranty ________________________________________ 37
Copyright 1998 KUHN S.A.

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The symbol above is used throughout this manual every time recommendations are made concerning your
safety, the safety of others, or the good operation of the machine.
These recommendations must be made known to all machine operators.
DESIGNATED USE OF THE MACHINE
The GMD 44 - 55 - 66 SELECT Disc Mowers must only be used for the work which they have been
designed : mowing on the ground of hay fields, grass silage fields and improved pastures for the purpose of
harvesting fodder for feeding livestock.
The manufacturer is not held liable for any damage resulting from machine applications other than those specified
by the manufacturer.
Any use other than the designated operation is at the risk and responsibility of the operator.
Designated use of the machine also means :
- following operation, maintenance and repair recommendations given by the manufacturer ;
- using only genuine spare parts, equipment and accessories as designated by the manufacturer.
The GMD 44 - 55 - 66 SELECT Disc Mowers must only be operated, maintained and repaired by competent
persons who are familiar with machine specifications and operation and are aware of any danger involved.
The operator must imperatively respect current legislation concerning :
- accident prevention,
- work safety,
- public traffic circulation.
All safety advice indicated on the machine must be strictly observed.
The manufacturer is not held liable for any damage resulting from machine modifications carried out by the
operator himself or by a third party without previous written agreement from the manufacturer.
SAFETY

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GENERAL SAFETY RECOMMENDATIONS
Before operating the machine, always ensure that tractor and machine are in accordance with work safety and
road traffic regulations.
BASIC PRINCIPLES
1. In addition to the recommendations given in this manual, legislation on work safety and accident prevention
must also be respected.
2. Advice is indicated on the machine, specifying safety recommendations in order to prevent accidents.
3. Before travelling on public roads, the operator must ensure that the machine conforms to road traffic
regulations.
4. Before starting work, the operator must be familiar with all machine controls, handling devices and their
functions. nce at work, it is too late to do so !
5. Do not wear loose clothing which could become caught up in moving elements.
6. Use a tractor equipped with a safety cab. Keep windows and roof hatch closed for reduced sound level while
operating the PT driven implement.
7. Before starting up the machine and beginning work, check the surrounding area (beware of children !). Make
sure there is sufficient visibility. Keep all people and animals away from the danger zone of the machine (risk
of projection!)
8. Carrying people or animals on the machine when working or in transport is strictly forbidden.
9. Machine must only be attached to tractor using means provided and in accordance with current safety
standards.
10. When attaching or removing the machine, place the parking stand into the corresponding position.
11. Special care should be taken when attaching or removing the machine from the tractor.
12. Before attaching the machine, ensure that the front tractor axle is sufficiently ballasted.
Ballast is to be placed on the supports provided in accordance with instructions of the tractor manufacturer.
13. Do not surpass the maximum axle load or the overall transport weight as prescribed by the tractor
manufacturer.
14. Do not surpass the maximum transport width authorized by road traffic regulations.
15. Before transporting the machine on public roads, ensure that all legally required guards and indicators
(lights, reflectors ...) are in place and in good operation.

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16. All operating controls (cords, cables, rods ...) must be positioned so that they cannot be set off accidently,
risking accident or damage.
17. Before transport on public roads, locate the machine into its transport position as instructed in this operators
manual.
18. Never leave the tractor seat while the machine is operating.
19. Drive speed must be adapted to ground conditions as well as roads and paths.
Always avoid abrupt changes of direction.
20. Precision steering, tractor adherence, road holding and efficient braking are influenced by the type of
implement, weight, ballast of front axle, ground or road conditions. It is therefore of utmost importance to
be cautious in every given situation.
21. Be particularly cautious when turning corners, paying attention to machine overhang, length, height and
weight.
22. Before operating the machine, ensure that all safety guards are firmly in place and in good condition. If worn
or damaged, replace immediately.
23. Before operating the machine, check tightness of nuts and bolts, particularly on tool fixing elements (blades,
tines, knives, spades ...). Retighten if necessary.
24. Keep clear of the machine operating area.
25. WARNING ! Danger of crushing and shearing can exist when components are operated by hydraulic or
pneumatic controls.
26. Before leaving the tractor or before adjusting, maintaining or repairing the machine, turn off the engine,
removeignition key and wait until all moving parts have come to a complete stop.
27. Do not stand between the tractor and the machine unless the hand brake is tight and/or stops have been
placed under the wheels.
28. Before any adjustments, maintenance or repairs are carried out, ensure that the machine cannot be started
up accidentally.

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ATTACHMENT
1. When attaching or removing the machine from the tractor, position hydraulic lift control lever in such a way
that it cannot be set off accidentally.
2. When attaching the machine to tractor 3-point linkage, ensure that diameter of link pins corresponds to
diameter of ball joints.
3. WARNING ! Danger of crushing and shearing can exist in the lifting zone of the 3-point linkage !
4. Do not stand between the tractor and the machine when operating the outer control lever of the lift mechanism.
5. In transport, the machine lift mechanism should be stabilized by tractor tie rods to avoid floatation and side
shifting.
6. When transporting the machine in the raised position, lock the lift control lever in place.
7. Do not operate the machine with narrow wheeltrack tractors when working or transporting on uneven or sloping
terrain.
POWER TAKE-OFF
1. nly use PT shaft supplied with the machine or recommended by the manufacturer.
2. PT guards must always be in place and in good condition.
3. Check for correct PT overlap when at work and in transport.
4. Before attaching or removing the PT shaft, disengage PT shaft, turn off engine and remove ignition key.
5. If a primary PT shaft is equipped with a slip clutch or a free wheel, these must be fitted on the machine
PT .
6. Ensure that PT shaft is always correctly fitted and locked into place.
7. Make sure guards are correctly in place and secured with the safety chains provided.
8. Before engaging PT , ensure that PT speed and direction are in accordance with manufacturers
recommendations.
9. Before engaging PT , keep all people and animals clear from the machine.
10. Never engage PT shaft when tractor motor is turned off.

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11. Never surpass PT angle recommended by the manufacturer.
12. WARNING ! Rotating elements can continue turning momentarily after PT is disengaged. Keep clear until
all rotating elements are at a standstill.
13. When removing the machine, locate PT shaft on the supports provided.
14. Fit safety cap on tractor PT .
15. Replace any worn or damaged PT guards immediately.
HYDRAULIC SYSTEM
1. WARNING ! Hydraulic system is under pressure.
2. When fitting hydraulic motors or cylinders, ensure that connections have been made correctly, as per
manufacturers instructions.
3. Before connecting hoses to the tractor hydraulics, ensure that tractor and machine circuits are not under
pressure.
4. It is strongly recommended that the operator marks the hydraulic connections between tractor and machine
to avoid making a wrong connection. WARNING ! Functions could be reversed (for example : lift/lower).
5. Check hydraulic hoses regularly ! Worn or damaged hoses must be replaced immediately.
Replacement parts must be in accordance with manufacturers recommendations concerning specifications
and quality.
6. Should a leak be found, take all necessary precautions to avoid accidents.
7. Any liquid under pressure (particularly oil from hydraulics) can penetrate the skin and cause severe injury. If
injured, see a doctor immediately, there could be danger of infection.
8. Before any adjustments, maintenance or repairs are carried out, lower the machine, depressurize the circuit,
turn off the engine and remove ignition key.

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MAINTENANCE
1. Before checking any machine malfunction and before adjusting, maintaining or repairing the machine,
disengage PT , turn off engine and remove ignition key.
2. Check tightness of nuts and bolts regularly. Retighten if necessary.
3. If the machine is raised, prop it up in a stable position before carrying out any maintenance work.
4. When replacing a working part, wear protection gloves and only use standardized tools.
5. It is forbidden to discard any oil, grease or filters. These must be given to waste disposal organisations to
protect the environment.
6. Disconnect power source before any work is done on the electric system.
7. Check safety guards regularly, particularly those that are subject to wear. Replace immediately if damaged.
8. Spare parts used must be in accordance with specifications and standards as defined by the manufacturer.
Use only genuine KUHN parts !
9. Before any electric welding is carried out on tractor or attached machine, disconnect generator and battery
terminals.
10.Repairs on elements under pressure or tension (springs, accumulators etc.) must only be carried out by
competent persons with standardized equipment.
SPECIAL SAFETY RECOMMENDATIONS
1. Use a tractor equipped with an enclosed cab with windows made of safety glass and kept closed. It is
recommended to fit polycarbonate screens inside the tractor safety cab's side and rear windows or to install
mesh guards on the exterior of them.
2. Stay a safe distance away from the mower when discs are rotating.
3. For safe machine operation, it is imperative that cutting tools be fitted in accordance with the manufacturers
recommendations. Use only the tool outfit supplied with the machine.
4. Each time before using the mower, inspect condition of cutting elements (knives, discs). Replace any missing,
worn or damaged cutting elements immediately. Use only genuine KUHN spare parts.
5. To avoid creating dangerous out of balance forces, always replace missing, damaged or worn knives in pairs.

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6. When replacing knives or discs, systematically inspect their securing elements as per the manufacturers
recommendations.
7. Regularly inspect the disc mowers protection cover. Worn or damaged protection covers must be replaced
immediately.
8. Protection devices (such as guards, shields etc.) are intended to prevent stones, rocks or other foreign objects
from being projected. They also prevent access to the machines danger zones. Therefore, it is imperative
that protection devices are put in place and properly secured each time before using the machine.
9. Crushing and shearing zones which could cause serious bodily injury when changing the machine from
transport to work position and vice versa may exist. To prevent possible injury, be extra careful when
maneuvering and ensure that everyone is at a safe distance away from the machine.
10.PT drive to the mower must never be engaged unless the cutterbar skid shoes are in contact with the ground
and the protective cover is folded down.
11.Ground of the pastures to be mown must be free of foreign objects.
12.Even when the machine is used in accordance with it purpose, objects may be projected. It is therefore
imperative that everyone be kept away from the danger zone, that extra care is taken and that extra precaution
(such as safety indicators) be taken when mowing pastures alongside roads or near public areas (parks,
schools etc.).
13.Never mow in reverse.
14.When disengaging the PT drive, moving parts continue to rotate for some time. Wait for all moving parts
to come to a complete stop before approaching the machine.
15.If an obstruction is hit, stop the tractor immediately, disengage PT drive, turn off engine, remove ignition key
and wait for all moving parts to come to a complete stop.
Check the entire machine for any damage before resuming work.
16.It is strongly recommended to have your machine checked by your dealer after each season, especially blades
and discs and their fixing devices (nuts, bolts etc.).

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SAFETY DECALS
THE F LL WING SAFETY PICT RIALS HAVE BEEN PLACED N Y UR MACHINE IN THE
AREAS INDICATED. THEY ARE INTENDED F R Y UR PERS NAL SAFETY AND F R THE
SAFETY F THE PE PLE W RKING WITH Y U. THE TEXT SH WN N THEM GIVES THEIR
PRECISE MEANING. KEEP THE PICT RIALS LEGIBLE. IF THEY ARE N T, REPLACE THEM.

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TECHNICAL SPECIFICATIONS
GENERAL INFORMATION
The GMD SELECT multidisc mowers are designed for 540 PT rpm tractors only with standards ASAE or DIN
Category 1 or 2 three-point hitches.
Depending on the size of the tractor and the wheel spacing, it may be necessary to use the bushings supplied
or to turn the linkage pins over for attaching the GMD 44 SELECT, GMD 55 SELECT and GMD 66 SELECT
multidisc mowers.
The tractor should be 30 hp minimum for the GMD 44 SELECT, 40 hp minimum for the GMD 55 SELECT
and 45 hp minimum for the GMD 66 SELECT.
Insufficient tractor horse power may cause stripping and poor cutting.
GMD 44 SELECT GMD 55 SELECT GMD 66 SELECT
Number of discs 4 5 6
Width of cut 1.60 m (5' 3") 2.00 m (6' 7") 2.40 m (7' 10")
PT power requirement 21 kW (28 hp) 25 kW (35 hp) 31 kW (42 hp)
Disc speed (at 540 rpm) 3 030 t/mn 3 030 t/mn 3 030 t/mn
Weight 366 kg (805 lbs) 405 kg (891 lbs) 452 kg (994 lbs)
Width in transport
position 0.25 m (10") wider than tractor width
Lift system of the mechanical or
cutterbar hydraulic hydraulic hydraulic

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ASSEMBLY INSTRUCTIONS
To facilitate shipping of the GMD 44 - 55 and 66 SELECT disc mowers, certain parts or assemblies are partially
disassembled to reduce bulk. To assemble these parts proceed as follows :
1) Mounting the ain fra e on the
cutterbar
Attach main frame to cutterbar by means of 2 self
locking nuts (A) (M 14) as shown on photo 1. Tighten
nuts (A) to 13,5 daN / 100 ft.lbs.
FOR YOUR PERSONAL SAFETY,
BLOCKS SHOULD BE PLACED
UNDER FRAME.
2) Mounting belt shields and belts
- Install inner belt shield (C) (photo 2) and secure with 3 spacer bolts (B) taped on the check chain. Torque to
5 daN / 40 ft.lbs.
- Unscrew nut (E), place plate (F) in proper position, add a washer (dia. 16 x 30 x 3) and refit nut (E) (photo 3).
- Install the belts (D), tighten them by loosening nuts (G) and tightening nut (E) (photo 3). Belt tension is correct
if deflection does not exceed 10 mm (2/5") when a belt is pressed upon with a force of 3.5 kg (8 lbs) at mid
distance between pulleys.
- Make sure that pulley housing guide (H) (photo 4) is against main frame.
Tighten nuts (G) after correct tension is obtained.
- Install outer belt shield (I) and secure with the 3 washers and nuts (J) (photo 5). Torque to 5 daN / 40 ft.lbs.
- Assemble closing plate (F) (photo 3) and outer belt shield with one self-locking screw (K) (M 8 x 12) (photo 5).

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3) Fitting of the safety breakaway
Mount the safety breakaway (L) to the main frame
yoke (M) using the pin (N) and 2 roll pins ( )
(diameter 5 x 36) and to the 3-point frame yoke (P)
using the pin (Q) and 2 roll pins (R) (diameter 6 x
45), as shown in photo 6.
4) Mounting the inner shoe
Attach the inner shoe (S) using the 4 lower positions with 2 self locking bolts (T) (M 10 x 16 mm) and 2 self locking
bolts (U) (M 10 x 20 mm) (photos 7 and 8).
Do not forget to attach brackets (V and W) with bolts (U) (photos 7 and 8).

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5) Mounting the fra e pipe and the lift bracket
- n the GMD 66 SELECT attach the outer end of
the frame pipe on the outer shoe (S) with a self
locking bolt (A) (M 16 x 50) (tighten to a torque of
28 daN - 210 ft.lbs) (photo 10).
Install and tighten the self locking bolt (H) (M12 x
30) and its lock nut (photo 10).
Then tighten the 4 bolts (L) (photo 9) of the frame
pipe to 14 daN / 100 ft.lbs.
- Attach frame pipe (T) to the gearbox with 4 self
locking bolts (L) (M 12 x 35) (tighten to a torque of
14 daN - 100 ft.lbs) (photo 9).
NOTE : Do not yet tighten the 4 bolts (L) on the
GMD 66 SELECT.
- Attach the outer deflector (E) on the frame pipe with
4 carriage bolts (I) (M 10 x 25) and 4 self locking
nuts (M 10) (photo 11).
- Attach the lift bracket (K) on the frame pipe with pin
(N) and split pins (F) (dia. 4 x 32) (photo 12).

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6) Mounting the inner swath board
- Attach the inner swath board (J) with 4 carriage
bolts (M) (M 10 x 20), 4 washers (dia. 11 x 24 x 2)
and 4 self locking nuts (M 10) (photo 13).
7) Mounting the swath board
- Attach the swath board at " " with one carriage bolt
(M 12 x 80), spring, dished washer and lock nut
(photo 14). Tighten nut enough so swath board can
still pivot freely. Attach swath stick (R) on board (U)
with one swath stick point (Y), carriage bolt (V) (M
8 x 30), carriage bolt (W) (M 8 x 50) and 2 self
locking nuts (M 8) (photo 14).

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8) Mounting the safety guard and its locking device
- Attach the front safety bar (B) to its hinges (C) with
the cup square bolts (P) (M 10 x 25), self locking
nuts ( ) (M 10) and washers (Q) (Ø 11 x 24 x 2) (fig.
15).
- Then attach the pre-assembled front safety bar (B)
at "N" with hexagonal screws (M 12 x 75) and self
locking nuts (M 12) (photo 16). Do not tighten these
screws completely, so that the front safety bar can
still pivot.
- Next attach the rear safety bar (A) with cup square
bolts (P) (M 10 x 25), cup square bolts (V) (M 10 x
50) and self-locking nuts ( ) (M 10) (fig. 15). Fit
end-plug (Z) on rear safety bar (A) (photo 16).

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- Install cover (D) as shown in photo 17. Buckle straps around the pipe frame at "E".
Buckle straps (F) around front and rear safety bar.
All these straps are attached to the underneath of the safety cover.
- Punch 3 holes in the safety cover at "G" and use 2 cup square bolts (R) (M 10 x 35) and 1 cup square bolt
(V) (M 10 x 50) with self-locking nuts ( ) (M 10) (fig. 15, photos 17 and 18) and plain washers (Q) (dia. 11 x
24 x 2) to attach the following components on the outside arms of the safety bars : safety guard locking device
(S) ; safety cover (D) ; stop rod (J) on GMD 44 and 55 SELECT (fig. 15).
Note : Make sure that the pivot axis of the safety guard locking device (S) is lined up with the pivot axis
(N) of the front safety bar before tightening self-locking nuts (O).
CAUTION : ALWAYS OPERATE MOWER WITH SAFETY COVER IN PLACE AND THE
FRONT END OF THE COVER LOWERED. NEVER LEAN AGAINST OR STAND ON
SAFETY COVER.
- The safety guard locking device is operated with an
16 mm box spanner (T) to be stored in the support
(U) provided (photo 19).

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FITTING TO THE TRACTOR
Attach ent of lower links and positionning
of link pins :
Follow fig. 1 for category 2 tractors with standard wheel
track (ex-work setting).
Follow fig. 2 for category 1 tractors with standard wheel
track .
After removing the roll pin (E) and the support chain
(R), turn the right lower hitch pin (T) over to adapt the
machine to category 1 tractors (photo 3). Make sure to
reinstall all parts after having turned the hitch pin (T)
over.
NOTE : For an optimum attachment, the distance (A) should be of minimum 5 cm/ 2".