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OPERATOR'S MANUAL
KN095AGB F
Disc mower
GMD55 SELECT
KN095AGB F
- English - 11-2009
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Disc mower
GMD55 SELECT
$Dear Owner
In buying a Kuhn machine you have chosen wisely. Into it have gone years of thought, research and
improvement. You will find, as have thousands of owners all over the world, that you have the best that
engineering skill and actual field testing can produce. You have purchased a dependable machine, but only
through proper care and operation can you expect to receive the performance and long service built into it.
This manual contains all the necessary information for you to receive full efficiency from your machine. The
performance you get from this machine is largely dependent on how well you read and understand th is manual
and apply this knowledge. Please DO NOT ASSUME YOU KNOW HOW TO OPERATE AND MAINTAIN YOUR
MACHINE before reading this manual carefully. KEEP THIS MANUAL AVAILABLE FOR REFERENCE. Pass
it on to the next owner if you re-sell the machine.
Your KUHN dealer can offer a complete line of genuine KUHN service parts. These parts ar e manufactured and
carefully inspected in the same factory that builds the machine to assure high quality and accurate fitting of any
necessary replacements.
About improvements
We are continually striving to improve our products. It therefore reserves the right to make improvements or
changes when it becomes practical to do so, without incurring any obligations to make changes or additions to
the equipment sold previously.
Designated use of the machine
The GMD55 SELECT mower must only be used for the purpose for which it was manufactured: mowing on the
ground of hay fields, grass silage fields and improved past ures for the purp ose of harve sting fodd er fo r feeding
livestock.
Dear Owner
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Disc mower
GMD55 SELECT
$Contents
Dear Owner.....................................................................................................................1
Contents..........................................................................................................................2
Identification of the machine.........................................................................................4
Front view..........................................................................................................................................4
Rear view.. .......................................... ... .... ... ... .......................................... ... ... .... ... ... ........................4
Model identification plate ................................................................................................................5
Optional equipment..........................................................................................................................5
Safety...............................................................................................................................6
Description of symbols used in this document.............................................................................6
Safety instructions...........................................................................................................................7
Location and description of safety decals on the machine .......................................................15
Road safety equipment and recommendations...........................................................................18
Machine specifications................................................................................................19
Description and glossary...............................................................................................................19
Technical specifications................................................................................................................20
Sound levels ......... ... ... .... ... ... ... .... ............................................. ......................................................20
Putting into service......................................................................................................21
Description of control elements....................................................................................................21
Coupling and uncoupling..............................................................................................................21
Instructions for transport............................................................................................32
2
Putting the machine into transport position................................................................................32
Conformity with the road regulations...........................................................................................34
Contents
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Disc mower
GMD55 SELECT
Instructions for work...................................................................................................35
Putting the machine into work position............. ..........................................................................35
Adjustments in working position..................................................................................................37
Machine use....................................................................................................................................40
Optional equipment.....................................................................................................41
Raised skid shoes..........................................................................................................................45
Signalling........................................................................................................................................46
Inner swath shield..........................................................................................................................45
Wear plate.......................................................................................................................................46
Maintenance and storage............................................................................................ 47
Frequency chart .............................................................................................................................47
Lubrication............................................................................................ ..........................................48
Maintenance....................................................................................................................................51
Storage............................................................................................................................................58
T rouble shooting guide...............................................................................................59
Limited warranty.......................................................................................................... 60
Contents
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1. Front view
Disc mower
GMD55 SELECT
$Identification of the machine
2. Rear view
4
Identification of the machine
Page 7
3. Model identification plate
Please write below the type and serial number of the
machine. This information is to be indicated to the dealer
for all spare parts orders.
Type: GMD55 SEL
Disc mower
GMD55 SELECT
Serial no.:
4. Optional equipment
Tick box corresponding to the equipment fitted on your
machine:
Kit no. 4500560: Reinforced PTO shaft.
Kit no. 1026000: "HD" discs.
Kit no. 1016400: Raised skid shoes.
Kit no. 1046050: High cone disc.
Kit no. 1036000: Inner swath shield.
Kit no. 1026100: Signalling.
Part no. 56330210: Wear plate.
Identification of the machine
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$Safety
1. Description of symbols used in this document
This symbol indicates a potentially hazardous situation
that if not avoided, could result in serious bodily injury.
Disc mower
GMD55 SELECT
This symbol is used to identify special instructions or
procedures which, if not followed strictly, could result in
machinery damage.
This symbol is used to communicate technical
information of particular interest.
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Safety
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Disc mower
GMD55 SELECT
2. Safety instructions
Introduction
The machine must only be operated, maintained and repaired by competent persons who are familiar with
machines' specifications and operation and aware of safety regulations fo r preventing accidents.
The operator must imperatively respect safety instructions in this manual and in the warnings posted on the
machine. The operator is also obliged to respect current le gislation concerning accident prevention, wo rk safety
and public traffic circulation.
Designated use of the machine also means following operation, maintenance and repair recommendations
given by the manufacturer, and using only genuine spare parts, equipment a nd acce sso ries, as r ecom mended
by the manufacturer.
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.
The manufacturer is not held liable for any damage or accident re sulting from machine modifications carried out
by the operator himself or by a third party without previous written agreement from the manufacturer.
Read and follow the safety instructions
Before using the machine, carefully read all the safety
instructions in this manual and the warnings placed on
the machine.
Before starting work, the operator must be familiar with
all machine controls, handling devices and their
functions. It is too late to learn once work has been
started!
Never let anyone operate the machine who is not traine d
to do so.
Should you have any difficulties in understanding certain
parts in this manual, please contact your KUHN dealer.
Precautions to be taken before carrying out
any operations on the machine
Before leaving the tractor or before adjusting,
maintaining or repairing the machine, disengage the
PTO drive, turn off the engine, remove ignition key and
wait until all moving parts have come to a complete stop
and apply park brake.
Safety
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Precautions to take before using the
machine
Do not wear loose clothing which could become caught
up in moving parts.
Wear the appropriate protective clothing for the work in
hand (gloves, shoes, goggles, helmet, ear defenders,
etc.).
Ensure that all operating controls (ropes, cables, rods,
etc) are placed so as they cannot be operated
unintentionally and cause damage or injury.
Before operating the machine, check tightness of nuts
and bolts, particularly on fixing elements (tines, forks,
blades, knives, etc). Retighten if necessary.
Before operating the machine, ensure that all the safety
guards are firmly in place and in good condition.
Immediately replace any worn or damaged guard.
Disc mower
GMD55 SELECT
Precautions when driving
Tractor handling, stability, performance and braking
efficiency are all affected by weight distribution, trailed or
mounted implements, additional ballast and driving
conditions. It is therefore of great importance that the
operator exercises caution in every given situation.
Groundspeed must be adapted to ground conditions as
well as to roads and paths. Always avoid abrupt change s
of direction.
Be particularly cautious when turning corners, paying
attention to machine overhang, length, height and
weight.
Never use a narrow track tractor on very uneven or
steeply sloping ground.
Never leave the tractor seat while the machine is
operating.
Carrying people or animals on the machine when
working or in transport is strictly forbidden.
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Safety
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Precautions when driving on public roads
Dimensions
Depending on the dimensions of the machine, contact
the relevant authorities to ensure that it can be legally
transported on public roads.
If the machine is over the maximum legal size, follow the
local regulations for special transportation of oversize
equipment.
Gross weight and weight per axle
Check that the tractor's authorized gross weigh t as well
as its lift capacity and maximum weight per axle are not
exceeded.
The front axle load (1) must never, under any
circumstances, be less than 20% of the tractor's unladen
weight. If necessary, add ballast weights to the front or
to the rear to preserve the steering and braking
efficiency.
Disc mower
GMD55 SELECT
Transport position
Before transporting the machine on public roads, place
the machine into its transport position, according to the
instructions in this manual.
Lights and indicators
Before transporting the machine on public road s, ensure
that all legally required lightings and signallings are in
place.
Ensure that lightings and signallings are clean and in
good working order. Replace any missing or broken
equipment.
Always obey current regulations for driving
on roads.
Maximum speed
Always keep to the legal speed limit for driving a tractormachine assembly on public roads.
Safety
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Precautions when coupling
Before attaching the machine, make sure that it cannot
accidentally start moving (chock the wheels) and that the
parking stand is in the right position.
The machine must only be attached to the hitch points
provided for this purpose.
Never stand between the tractor and the machine when
operating the three point linkage.
Do not stand between the tractor and the machine
without ensuring that the parking brake is applied.
Hydraulic circuit
Disc mower
GMD55 SELECT
Caution! The hydraulic circuit is under high pressure.
Maximum pressure at work: 200 bar (2900 psi).
Before connecting hoses to the tractor hydraulics,
ensure that tractor and machine circuits are not under
pressure. Before disconnecting a hose, depressurize the
hydraulic circuit.
To avoid making incorrect connections, mark hydraulic
couplers and corresponding hoses with colors.
WARNING! Functions could be reversed (for example:
lift/lower) and cause accidents.
Regularly check the hydraulic hoses. In case of normal
wear, replace the hydraulic hoses every 5 years.
Damaged or worn hoses must immediately be replaced.
When replacing the hydraulic hoses, only use hoses with
the specification recommended by the manufacturer of
the machine.
To locate a leak, use appropr iate means. Protect body
and hands from liquid under pressure.
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.
Before any adjustments, maintenance or repairs are
carried out, lower the machine to the ground,
depressurize the hydraulics, turn off the engine, remove
ignition key and wait until all moving parts have come to
a complete stop.
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Safety
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PTO shaft
Use only PTO shafts supplied with the machine or
recommended by the manufacturer.
The protective shield of the tractor PTO stub, the PTO
shaft guards and the protective covering of the machine
input shaft must always be in place and in good
condition.
Make sure that the PTO shaft guards are se cured with
the safety chains provided.
Any worn or damaged guards must be replaced
immediately. A worn guard or an unprotected PTO shaft
can cause a serious or even a lethal accident.
Do not wear loose clothing that could be caught in the
rotating PTO shaft.
Before attaching or removing a PTO shaft, or before
doing any work on the machine, disengage the PTO
drive, turn off the engine, remove ignition key and wait
for all moving parts have come to a complete stop.
If the primary PTO shaft is equipped with a slip clutch or
a free wheel, these must be fitted on the machine side.
Ensure that the PTO shaft is always correctly fitted and
locked into place.
Before connecting the PTO shaft, ensure that the PTO
speed (rotational frequency) and directions of rotation
are in line with manufacturer's recommendations.
Before engaging the PTO drive, make sure all people
and animals are clear from the machine. Never engage
the PTO drive when the tractor engine is stopped.
When uncoupling the machine, rest the PTO shaft on the
support specially provided, and replace protective cover
on the PTO stub of the tractor.
Read and follow the instructions in the operator's ma nual
provided with the PTO shaft.
Disc mower
GMD55 SELECT
Safety
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Precautions during manoeuvres
When moving the machine from the transport positio n to
the working position and vice versa, make sure that
nobody is within the machine pivoting area.
Remote controlled components
Danger of crushing and shearing can exist when
components are operated by hydraulic or pneumatic
controls. Keep away from these danger zones.
Safety decals
Safety warning decals are placed in pictorial form on
various parts of the machine. They are ther e to warn you
of potential dangers and to tell you how to avoid
accidents.
Always keep the safety decals clea n and readable, and
replace them when they are worn, damaged, missing or
illegible.
Disc mower
GMD55 SELECT
Waste disposal
Respect the environment! Never spill pollutants (oil,
grease, filters, etc.) on the ground, never pour them
down the drain and never discard them in any other
place where they could pollute the environment. Never
throw away or burn a tyre. Always take waste to
specialized recycling or waste disposal centers.
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Safety
Page 15
Precautions for maintenance and repair work
Before leaving the tractor or before adjusting,
maintaining or repairing the machine, disengage the
PTO drive, turn off the engine, remove ignition key and
wait until all moving parts have come to a complete stop
and apply park brake.
Rest the machine on the ground, release the pressure
from the hydraulic circuit and leave the machine to cool
down.
Make sure that the parts of the machine that need to be
lifted for maintenance or repair work are firmly propped
up.
Before any work is done on the electric circuit or before
any electric welding is carried out on the attached
machine, disconnect the machine from the tractor
electrical circuit. Also disconnect alternator and battery
terminals.
Repairs on elements under pressure or tension (springs,
pressure accumulators, etc.) must only be carried out by
competent persons with regulation equipment.
Wear the appropriate protective clothing for the work in
hand (gloves, shoes, goggles, helmet, ear defenders,
etc.).
Do not solder, weld or use a blow torch near fluids under
pressure or inflammable products.
For your own safety and for correct machine operation,
only use original manufacturer parts.
It is strongly recommended to have your machine
checked by your Kuhn dealer after each season,
especially tools and their attaching hardware.
Disc mower
GMD55 SELECT
Projection of stones and foreign objects
For driver safety, always use a tractor equipped with a
cab. Keep the ground to mow free of foreign bodies.
Avoid mowing on stony or rocky grounds. If this is not
possible, take extra safety precautions, such as:
- Fit polycarbonate screens inside the tractor cab's side
and rear windows, or install narrow mesh guards on
their exterior.
- Increase the cutting height to avoid contact with
stones or rocks.
Never start a mower conditioner when other people are
close.
Safety
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Even when the machine is used in accordance with its
purpose, objects may be projected. Stones and other
foreign objects projected by the moving parts can travel
a considerable distance. Keep all persons and animals
away from the danger zone.
The protection covers help reducing risks of projections.
Therefore, make sure that all mower protection devices
are in place and good condition prior to using the
machine.
Regularly check the condition of the protection covers.
Immediatly replace any worn, damaged or missing
cover.
Precautions for machine use
After each use, check the cutting tools (discs, knives)
and their attachment hardwa re in accordance with the
instructions given in the present manual. Immediately
replace any worn, damaged or missing cutting tool or
element. To do this, use the tool outfit supplied with the
machine. For your safety, only use genuine parts !
Regularly check the condition of the protection covers.
Immediatly replace any worn, damaged or missing
cover. Before engaging the PTO, rest the cutterbar on
the ground. Make sure all the guards are in place. Keep
all persons and animals away from the danger zone.
Stay a safe distance from the machine when the cutting
tools are in movement.
Never work in reverse.
After disengaging the PTO drive, cuttings tools can
continue rotating for some time. Stay away from the
machine until all moving parts have come to a complete
standstill.
If the machine hits an obstacle, disengage the PTO
drive, stop the tractor engine, remove the ignition key
and wait for all moving parts to come to a complete
standstill. Check the entire machine for any damage
before resuming work.
Disc mower
GMD55 SELECT
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Safety
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3. Location and description of safety decals on the machine
Location of safety decals
Disc mower
GMD55 SELECT
Safety
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Page 18
Description of safety decals
Operating instructions (1)
The operators' manual contains all the information
necessary for using the machine safely. It is imperative
to read and comply with all instructions.
Disc mower
GMD55 SELECT
Working on the machine (2)
Before leaving the tractor or before adjusting,
maintaining or repairing the machine, disengage the
PTO drive, turn off the engine, remove ignition key and
wait until all moving parts have come to a complete stop
and apply park brake.
Projections (3)
Stones and other debris pro jected by the moving parts
can travel a long distance. The protection covers must
always be in position and in good condition. Always sta y
at a safe distance from the machine.
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Safety
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Rotating cutting tools (4)
Keep away from the mower knives all the time the engine
is running, the PTO drive engaged and the moving parts
have not come to a complete stop.
Body crushing (5)
Stay a safe distance from the machine.
Crushing hazard.
Disc mower
GMD55 SELECT
Cutting tools (6)
The cutting tools and their attachment hardware meet
safety and reliability criteria set by standards and by the
manufacturer. For your own safety and for correct
machine operation, only use original manufacturer parts.
Do not step on the machine (7)
Do not step on the machine : Risk of falling or damaging
the protection device.
Safety
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Uncoupling the machine (8)
Always park the machine with the cutterbar in horizontal
position.
4. Road safety equipment and recommendations
Disc mower
GMD55 SELECT
The road safety equipment is mounted in the factory or
by your authorized Kuhn dealer according to current
safety regulations.
The device is composed of:
- A reflector (1).
Always keep to the legal speed limit for driving a tractormachine assembly on public roads.
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Safety
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$Machine specifications
1. Description and glossary
0
Disc mower
GMD55 SELECT
1 : Check chain 2 : Three-point hitch coupler
3 : Safety breakback 4 : Parking stand
5 : Work/transport cylinder 6 : Compensating spring
7 : Belt guard 8 : Front guard
9 : Cutterbar 10 : Swath shield
Machine specifications
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Page 22
GMD55 SELECT
2. Technical specifications
Attachment type 3 point linkage category 1 and 2
Number of discs 5
Working width 2.00 m (6’7’’)
Width in working position 3.92 m (12’1’’)
Height in working position 1.15 m (3’9’’)
Length in working position 2.35 m (7’9’’)
Width in transport position 1.72 m (5’8’’)
Disc mower
Height in transport position 2.57 m (8’5’’)
Length in transport position 2.00 m (6’7’’)
Disc rotational speed 3030 min
PTO speed 540 min
Weight 405kg(893lb)
Minimum PTO power requirement 25 kW (35 hp)
-1
-1
3. Sound levels
Sound levels have been measured in accordance with the measuring methods as defined in:
NF EN 1553
"Agricultural machinery - Self-propelled, mounted, semi-mounted and trailed - Common safety
recommendations"
Weighted equivalent continuous acoustic pressure level at the driver's seat (closed cabin) L (A) eq:
Tractor only: 81.1 dB(A)
Tractor + machine: 81.9 dB(A)
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Machine specifications
Page 23
$Putting into service
1. Description of control elements
The machine is supplied with an 16 mm box wrench (1)
to carry out certain adjustment and maintenance tasks.
Disc mower
GMD55 SELECT
2. Coupling and uncoupling
The machine adapts to tractors fitted with a 3-point hitch
coupler category 1 or 2.
Description of coupling elements
- A PTO shaft 1 3/8’’ - 6 splines.
- A check chain.
- One hydraulic hose which controls the machine
transport/work position setting.
Putting into service
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Preparing the tractor
Check that the tractor's authorized gross
weight as well as its lift capacity and
maximum weight per axle are not exceeded.
The front axle load (1) must never, under any
circumstances, be less than 20% of the
tractor's unladen weight. If necessary, add
ballast weights to the front or to the rear to
preserve the steering and braking efficiency.
The tractor must be fitted with lower link
stabilizers.
The tractor PTO stub must rotate at a speed of 540 min-1.
The tractor must be equipped with a single-acting
hydraulic outlet.
Disc mower
GMD55 SELECT
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Putting into service
Page 25
Preparing the machine
Linkage adjustment
The machine adapts to tractors fitted with a 3-point hitch
coupler category 1 or 2.
3 point, Category 1:
- Place lower links in position (a):
Disc mower
GMD55 SELECT
3 point, Category 2:
- Place lower links in position (b):
Putting into service
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Coupling the machine
- Lower the tractor three-point linkage.
- Attach lower links to the hitc h pins on either sides of
the machine (a).
- Secure each hitch pin with lynch pin (b).
Disc mower
GMD55 SELECT
- Attach top link.
- Lift the machine using the tractor lift linkage until the
parking stand no longer rests on the ground.
- Press push-button (1) and retract parking stand (2)
until push-button engages in position (3).
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Putting into service
Page 27
Hydraulic connections
-
Connect the mowing unit lift cylinder to a sin gle acting
valve.
Check chain
Fit check chain
See section "Frame height adjustment" to position the
check chain.
Disc mower
GMD55 SELECT
Putting into service
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Page 28
Primary PTO shaft
Make sure that the PTO shaft is correctly
adjusted, to avoid premature wear and tear.
The tractor PTO stub must rotate at a speed of 540 min-1.
Separate the two half PTO shafts and connect them to
the machine's input shaft and to the tractor PTO stub.
Check the length of the PTO shaft:
- When the PTO shaft is in its maximum overlap
position (retracted), tubes should not butt against the
yokes. As a safety measure, a clearance (L) of at least
25 mm (1’’) must be maintained.
- When the PTO shaft is in its maximum extended
position, the tube overlap must be more than
250 mm (10’’).
Disc mower
GMD55 SELECT
If this is not the case:
• Mark length (H) to cut when the transmission is the
maximum overlap position.
• Shorten the guard tubes and the transmission tubes
by the same length.
• Bevel and clean the tubes.
• Grease the inside of the outer tube.
Never operate the PTO shaft at an angle X exceeding
30°.
To avoid serious accidents, the PTO drive
shaft guards must be properly in place and
fixed with the chains provided.
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Putting into service
Page 29
-
Attach PTO shaft guard using chain provided in order to
prevent it from rotating.
Immediately replace any worn or damaged
guard.
Adjusting the machine
Positioning of lower links
- Measure dimension A.
- Adjust tractor lower link stabilizers to measure A =
50 mm (2’’).
Disc mower
GMD55 SELECT
Hitch pin parallelism.
From the headland turn position:
Measure and adjust the height of the hitch pins until the
same measure is obtained on each side:
- Note the difference in height between the two hitch
pins.
Place the machine in working position:
Adjust the tractor left levelling rod according to the
difference in height.
Place the machine in headland turn position.
Check the difference in height between the 2 hitch pins.
Proceed the same way to obtain identical (A) and (B)
heights.
Putting into service
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Page 30
Frame height and check chains.
- Tractor fitted with a hydraulic position control function:
• Lower the tractor lift linkage so that hitch pins ar e at
a distance H = 400 mm / 1’4’’ from the ground.
• Note the corresponding lever position in the tractor
cab.
It is not necessary to use the check chain
supplied with the machine.
Refer to the decal fitted on the machine to check
the distance between the hitch pins and the
ground.
Disc mower
GMD55 SELECT
Tractor not fitted with a hydraulic position control
function:
• Lower tractor lift linkage until hitch pins are at a
distance (H) slightly over H = 400 mm (1’4’’) from
the ground.
• Insert hook (1) in check chain link corresponding to
the required frame height and lock using roll pin (2 ).
• Attach each check chain with its hook supplied with
the machine to one of the upper free holes at the
tractor's top link attachment clevis.
• Lower the machine until the check chain is under
tension.
The tractor lift linkage is in working position.
The height is correct when:
• The cutterbar is resting on the ground.
• The check chain is under tension.
• The distance H = 400 mm (1’4’’).
• The 2 hitch pins are parallel to the ground.
28
Putting into service
Page 31
Safety breakback
On hitting an obstacle, the safety breakback causes the
cutterbar to pivot rearwards.
If the machine hits an obstacle, disengage
the PTO drive, stop the tractor engine,
remove the ignition key and wait for all
moving parts to come to a complete
standstill.
In case an obstacle has been struck, check
that the mowing unit has not been damaged.
Disc mower
GMD55 SELECT
The safety breakback is reset by reversing (a).
If the safety breakback releases after reset, tighten
screw 1 to increase spring washer compression.
Basic adjustments:
L= 96 mm (3.8’’)
A= 20 times 2 washers.
Putting into service
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Page 32
Uncoupling the machine
For tractors not fitted with a hydraulic
position control function, unhook check
chain.
The machine must be uncoupled in working
position.
From the transport position:
- Remove lynch pin (1) and pin (2).
- Put compensation system in working position using
pin (2) and lynch pin (1).
Disc mower
GMD55 SELECT
- Remove R-clip (2).
- Remove transport lock (1).
- Install lock (1) on frame.
- Secure using R-clip (2).
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Putting into service
Page 33
- Activate the transport/work cylinder control valve in
the "pivot into work" position.
- Lift the machine with the tractor's three point linkage.
- Press push-button (1) and lower parking stand (2)
until push-button engages in position (3).
- Lower the tractor three-point linkage to rest the
machine on the ground.
Disc mower
GMD55 SELECT
- Detach the top link from the machine end.
- Uncouple the PTO shaft.
- Support PTO shaft with check chain attach ed around
the hitch pin (1).
- Disconnect hydraulic hose from tractor.
- Release the lower links.
- Lower the tractor three-point linkage.
The machine is uncoupled.
Putting into service
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Page 34
$Instructions for transport
Before placing the machine into transport
position:
- Check that nobody is within the machine
pivoting area.
- If there is someone, make sure the
person moves away.
1. Putting the machine into transport position
Disc mower
GMD55 SELECT
From the working position:
- Lift the machine with the tractor's three point linkage.
- Remove lynch pin (1) and pin (2).
- Lock compensation system in transport position using
pin (2) and lynch pin (1).
- Unlock and lift front guard using 16mm box spanner
supplied with the machine.
- The guard locks automatically.
32
Instructions for transport
Page 35
- Activate the transport/work cylinder to bring the
mowing unit in transport position.
- Remove R-clip (2).
- Remove transport lock (1).
Disc mower
GMD55 SELECT
- Install transport lock (1).
- Secure using R-clip (2) .
The machine is in transport position.
Never engage the tractor PTO drive when t he
machine is in transport position.
Instructions for transport
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2. Conformity with the road regulations
Before driving the machine on public roads,
ensure that the machine complies with
current highway code regulations.
Check that the retroreflective signalling equipment is
clean before going on public roads.
Replace worn or damaged reflectors.
Disc mower
GMD55 SELECT
34
Instructions for transport
Page 37
$Instructions for work
Before placing the machine in working
position:
- Check that nobody is within the machine
pivoting area.
- If there is someone, make sure the
person moves away.
1. Putting the machine into work position
Disc mower
GMD55 SELECT
From the transport position:
- Lift the machine with the tractor's three point linkage.
- Remove lynch pin (1) and pin (2).
- Put compensation system in working position using
pin (2) and lynch pin (1).
- Remove R-clip (2).
- Remove transport lock (1).
Instructions for work
35
Page 38
- Install lock (1) on frame.
- Secure using R-clip (2).
- Activate the transport/work cylinder control valve in
the "pivot into work" position.
Disc mower
GMD55 SELECT
- Press lock (1) and lower front guard (2).
- The guard locks automatically.
The machine is in working position.
During work, only use the tractor lift linkage
to place the machine in headland turn
position.
36
Instructions for work
Page 39
2. Adjustments in working position
Cutting height
The desired cutting height is obtained directly by
adjusting the top link length. The height can be adjusted
between 30 and 80 mm (1.1’’ - 3.1’’) depending on the
tractors.
To obtain a different cutting height:
- Place the machine in working position.
- Lower the machine on the ground to remove weight
from the top link.
- Modify the top link length to alter the machine tilt
angle.
- Check cutting height.
Disc mower
GMD55 SELECT
Too low a cutting height can lead to:
Excessive disc and knife wear.
Crop being contaminated by soil.
Delay in regrowth.
-
Instructions for work
37
Page 40
Swathing system
The swathing system comprises:
- A swath shield.
- A swath stick.
The swath stick fitted on the swath shield can be
adjusted in 6 positions according to the working
conditions:
Adjust stick angle according to the crop density
and length.
Disc mower
GMD55 SELECT
38
Instructions for work
Page 41
On slopes
For mowing on slopes exceed ing 10° below horizontal,
lengthen cylinder rod.
Coupling device (a):Work on flat grounds.
Coupling device (b):On slopes (X).
To switch from configuration (a) to configuration (b):
- Remove bolts (1) and nuts (2).
- Offset rod (3) to the required position.
- Reinstall bolts (1) and nuts (2).
- Tightening torque: 4.9 daN m (36 lbf ft).
Disc mower
GMD55 SELECT
Instructions for work
39
Page 42
3. Machine use
Before mowing and to reduce risks of
projections, lower the front guard.
Keep all persons and animals away from the
machine danger zone.
Never lean or step on the protection cover.
Before the machine engages the crop:
- Engage the tractor PTO and slowly increase the
speed up to 540 min
During work, only use the tractor lift linkage to place the
machine in headland turn position.
-1
.
Disc mower
GMD55 SELECT
Groundspeed
Adapt the forward speed to the working
conditions.
40
Instructions for work
Page 43
$Optional equipment
1. Reinforced PTO shaft
Part no. 4500560
In the following cases, the machine can be fitted with a
longer, reinforced PTO shaft with a free wheel
- Too short standard PTO shaft.
- Tractor fitted with a hydraulic PTO.
- PTO shaft angle exceeds X = 25 degrees at work.
Disc mower
GMD55 SELECT
2. "HD" discs
Part no. 1026000
The machine can be fitted with heavy discs and
reinforced knives to work in extreme conditions.
Inspection of knives and securing elements
Immediately replace worn or damaged parts with
genuine KUHN parts.
Knives
Inspect systematically all knives before the machine is
operated to:
• guarantee the cutting quality.
• guarantee safety in use.
• Prevent cutterbar damage risks.
Replace knives in the following cases:
Optional equipment
41
Page 44
- Damaged knives. Very rough conditions can cause
knives to crack and become deformed.
- Worn knives
Knife length C must exceed 80 mm (3.15’’).
Knife width B, measured at a distance A of 10 mm (0.4’’)
from the disc edge must exceed 20 mm (0.8’’).
The hole L for the securing bolt must not become oval by
more than 20 mm (0.8’’).
Always replace both knives per disc to avoid creating an
out-of-balance force.
Disc mower
GMD55 SELECT
42
Optional equipment
Page 45
Fixing elements
Check the fixing elements:
- After hitting an obstacle.
- When replacing knives.
- At the beginning of each season.
The fixing bolts should be changed in the following
cases:
- When there is visible distortion.
- When the locking compound is worn or inoperational.
- When the bolt head wear reaches the center line of
the bolt.
- When diameter D of the bolt shoulder is less than
15 mm (0.6’’).
- After having been removed 5 times.
Disc mower
GMD55 SELECT
Replace nuts in the following cases:
- When the contact washer has lost its elasticity.
- When the contact washer loosens itself from the nut.
- When nut wear reaches a = 5 mm (0.2’’).
- After having been removed 5 times.
Check the condition of the fixing elements
regularly and also the torque of the knife-fixing
bolt: 12 daN m (89 lbf ft).
-
Optional equipment
43
Page 46
Knife replacement
Replace knife lock-nuts and bolts when they
have been removed 5 times.
Replace immediately all worn or distorted
knives. Never straighten a bent knife.
Always replace both knives per disc.
Clean the nut case.
Place a wooden wedge between two discs to stop them
from rotating.
Loosen nut using box spanner supplied with the
machine.
Remove bolt through opening located at the front of the
disc guard.
Knives can be turned over on the same disc to use the
other cutting edge or replaced. On each knife , an arrow
indicates the disc's direction of rotation.
Make sure that the securing nut and bolt are in good
condition and if necessary, replace them.
Torque knife locknut to 7.5 daN m (55 lbf ft).
Dull knives require more horse power and have a
negative effect on the cut quality.
Disc mower
GMD55 SELECT
Disc replacement
Place a wooden wedge (2) between two discs to stop
them from moving.
Remove nut (1).
Remove the disc.
When remounting:
Position their largest diameters at right angles to each
other.
Position conical centre of spring washer at the top.
Tigthen nut (1).
Torque: 18 daN m (133 lbf ft)
44
Optional equipment
Page 47
When replacing outer and inner cones, make
sure to reinstall caps.
Disc mower
GMD55 SELECT
3. Raised skid shoes
Kit no. 1016400
The raised skid shoes enable mowing higher, between
60 and 120 mm (2.4’’ - 4.8’’).
Replace the end disc skids by the 2 raised skid shoes.
The use of raised skid shoes is also
recommended on sticky grounds.
4. Inner swath shield
Kit no. 1036000
The inner swath shield enables reducing the swath width
by approximately 300 mm (1’) depending on the crop
density.
Optional equipment
45
Page 48
5. High cone disc
Kit no. 1046050
Replace first disk with the high cone disk to reduce the
swath width by approximately 300 mm (1’) according to
the forage density.
Disc mower
GMD55 SELECT
6. Signalling
Kit no. 1026100
The machine can be fitted with specific signalling lights
to comply with the road regulations.
7. Wear plate
Part no. 56330210
Wear plates can be welded underneath the disc guard to
improve its resistance to wear in difficult working
conditions.
46
Optional equipment
Page 49
Before adjusting, maintaining or repairing
the machine, turn off ignition key and wait
until all moving parts have come to a
complete stop.
1. Frequency chart
Disc mower
GMD55 SELECT
$Maintenance and storage
Lubrication
Oil change:
- Cutterbar.
- Side gearbox.
Maintenance
- Breather plug checking and
cleaning.
After the first 10 hours of
use
33
33
Every 200 hours or at the
end of the season
Maintenance and storage
47
Page 50
2. Lubrication
Clean grease nipples before greasing.
Lubricate with SHELL multi-purpose grease
grade NLGI 2.
PTO shaft
Primary PTO shaft
Disc mower
GMD55 SELECT
- Every 8 hours:
• universal joints (1).
- Every 20 hours:
• transmission tube (2).
- Every 40 hours:
• guide rings (3).
48
Maintenance and storage
Page 51
Oil change
The cutterbar
Before draining oil, operate the machine for a
few minutes so that the oil warms up.
The cutterbar is lubricated with 2.00 L (0.52 US gal) of SHELL SPIRAX extreme-pressure gear oil with
viscosity grade SAE 80W90 and API grade GL5.
When draining and refilling, it is recommended to use either a mineral base oil with viscosity grade SAE
80W90 and API grade GL5, or a synthetic base oil, type PAO (Poly-Alpha-Olefins) with a viscosity grade
equivalent to SAE 80W90.
Never use an oil of viscosity SAE 90 in the
cutterbar.
Disc mower
GMD55 SELECT
From the transport position:
- Place a container of sufficient capacity under drain
plug.
- Remove filler plug (1) and its washer.
- Remove drain plug (2) and its washer.
- Allow oil to drain completely.
- Wait for dripping to stop.
- Clean and reinstall drain plug (2) and its
washer. Replace if necessary.
- Pour the correct oil quantity and quality through the
opening of the filler plug.
- Clean and reinstall filler plug (1) and its
washer. Replace if necessary.
Maintenance and storage
49
Page 52
Disc mower
GMD55 SELECT
The side angle gearbox
Before draining oil, operate the machine for a
few minutes so that the oil warms up.
The angle gearbox is lubricated with 0.25 L (0.5 US pints) of SHELL SPIRAX extreme-pressure oil for
mechanical transmissions with viscosity grade SAE 80W90 and API grade GL5.
When draining and refilling, it is recommended to use either a mineral base oil with viscosity grade SAE
80W90 and API grade GL5, or a synthetic base oil, type PAO (Poly-Alpha-Olefins) with a viscosity grade
equivalent to SAE 80W90.
From the transport position:
- Remove filler plug (1) and its washer.
- Place a container of sufficient capacity under drain
plug.
- Remove drain plug (2) and its washer.
- Allow oil to drain completely.
- Wait for dripping to stop.
- Place the machine in working position.(See
chapter: Putting the machine into work position).
- Pour the correct oil quantity and quality through the
opening of the filler plug (1).
- Check angle gearbox oil level:
• The oil level must reach the lower edge of the
emptying hole.
- Clean and reinstall drain plug (2) and its washer.
- Clean and reinstall filler plug (1) and its washer.
50
Maintenance and storage
Page 53
3. Maintenance
Before adjusting, maintaining or repairing
the machine, turn off ignition key and wait
until all moving parts have come to a
complete stop.
Belt tension
Regularly check belt tension and in particular
during the first hours of use.
Never replace belts individually.
Replace belts in full sets.
Disc mower
GMD55 SELECT
Checking the tension:
Apply a force of 3.5 kg (6.6 lb) on the belt: the belt should
not deflect more than 10 mm (0.39’’) (H).
Maintenance and storage
51
Page 54
Adjusting the tension:
- Unscrew the 2 nuts (1).
- Tighten screw (2) to tension belts.
- Check belt tension.
- Tighten the 2 nuts (1).
- Torque: 13 daN m (96 lbf ft).
Disc mower
GMD55 SELECT
Breather plug checking and cleaning
From the working position:
Remove breather plug (1).
Clean and check breather plug for good functioning (1).
Reinstall breather plug (1).
52
Maintenance and storage
Page 55
Check
Cutterbar oil level
Regularly check the cutterbar oil level:
From the transport position:
• Remove filler plug (1).
• The oil must reach the lower edge of the filling hole.
• Top up if necessary.
• Clean and reinstall filler plug (1) and its
washer. (Replace if necessary).
Disc mower
GMD55 SELECT
If it is found that the transmission case is very hot
to touch by hand, there is no cause of alarm
provided:
- Lubrication recommendations have been
respected.
- Discs can be rotated freely by hand when the
machine is hot.
Before checking that the discs rotate freely
by hand:
- Turn off the engine, remove ignition key
and wait until all moving parts have
come to a complete stop.
Maintenance and storage
53
Page 56
Knifes and their fasteners
Immediately replace worn or damaged parts with
genuine KUHN parts.
Knives
Inspect systematically all knives before the machine is
operated to:
• guarantee the cutting quality.
• guarantee safety in use.
• Prevent cutterbar damage risks.
Replace knives in the following cases:
- Damaged knives. Very rough conditions can cause
knives to crack and become deformed.
- Worn knives
Knife length C must exceed 80 mm (3.15’’).
Knife width B, measured at a distance A of 10 mm (0.4’’)
from the disc edge must exceed 20 mm (0.8’’).
The hole L for the securing bolt must not become oval by
more than 20 mm (0.8’’).
Always replace both knives per disc to avoid creating an
out-of-balance force.
Disc mower
GMD55 SELECT
54
Maintenance and storage
Page 57
Fixing elements
Check the fixing elements:
- After hitting an obstacle.
- When replacing knives.
- At the beginning of each season.
The fixing bolts should be changed in the following
cases:
- When there is visible distortion.
- When the locking compound is worn or inoperational.
- When the bolt head wear reaches the center line of
the bolt.
- When diameter D of the bolt shoulder is less than
15 mm (0.6’’).
- After having been removed 5 times.
Disc mower
GMD55 SELECT
Replace nuts in the following cases:
- When the contact washer has lost its elasticity.
- When the contact washer loosens itself from the nut.
- When nut wear reaches a = 5 mm (0.2’’).
- After having been removed 5 times.
Check the condition of the fixing elements
regularly and also the torque of the knife-fixing
bolt: 12 daN m (89 lbf ft).
-
Maintenance and storage
55
Page 58
Knife replacement
Replace knife lock-nuts and bolts when they
have been removed 5 times.
Replace immediately all worn or distorted
knives. Never straighten a bent knife.
Always replace both knives per disc.
Clean the nut case.
Place a wooden wedge between two discs to stop them
from rotating.
Loosen nut using box spanner supplied with the
machine.
Remove bolt through opening located at the front of the
disc guard.
Knives can be turned over on the same disc to use the
other cutting edge or replaced. On each knife , an arrow
indicates the disc's direction of rotation.
Make sure that the securing nut and bolt are in good
condition and if necessary, replace them.
Torque knife locknut to 7.5 daN m (55 lbf ft).
Dull knives require more horse power and have a
negative effect on the cut quality.
Disc mower
GMD55 SELECT
Disc replacement
Place a wooden wedge (2) between two discs to stop
them from moving.
Remove nut (1).
Remove the disc.
When remounting:
Position their largest diameters at right angles to each
other.
Position conical centre of spring washer at the top.
Tigthen nut (1).
Torque: 18 daN m (133 lbf ft)
56
Maintenance and storage
Page 59
When replacing outer and inner cones, make
sure to reinstall caps.
Disc mower
GMD55 SELECT
Maintenance and storage
57
Page 60
4. Storage
At the end of each season
- Clean the machine thoroughly.
- Drain all gearboxes and cutterbar and refill with new
oil (see "Lubrication" chapter).
- Touch up any areas of damaged paintwork.
- Put the machine under cover in a dry place.
- Inspect and replace worn knives and bolts (See
section "Inspection of knives and securing elements").
- Slacken V-belts and check their condition.
- Fully lubricate the machine.
At the start of each season
Disc mower
GMD55 SELECT
- Check that all nuts and bolts are sufficiently tightened.
- Retension belts.
- Check that safety breakback system functions.
- Re-read the operators' manual.
- Make sure all the guards are in place.
58
Maintenance and storage
Page 61
$Trouble shooting guide
-
Problem Cause Remedy
Dull or broken knives. Replace knives.
Make sure the arrow on the
Uneven stubble.
Soil build up in front of the
cutterbar.
Bad ground contour
adaptation.
Insufficient cutterbar ground
clearance in "headland turn"
position.
Considerable vibrations. Nylon plug missing.
Too frequent safety breakback
release.
Poor division between cut and
uncut crop.
Knives not installed correctly.
Too low PTO speed (rotational
frequency).
Very wet working conditions.
Incorrect main frame setting.
Excessive ground speed. Reduce ground speed.
Incorrect tractor lift linkage
setting.
Too long levelling rod
adjustment on tractor 3-point
lift.
Lengthened cylinder rod. Shorten cylinder rod.
Insufficient spring washer
compression.
Tangled and down crops.
knife upper face is pointing in
the disc's direction of rotation.
Increase speed to 540 min
Adjust main frame height with
regards to the ground.
Adjust main frame height with
regards to the ground.
See machine attachment.
Shorten levelling rods on
tractor 3-point lift.
Immediately replace missing
cap.
Increase spring washer
compression.
Check swath shield retaining
spring tension.
Disc mower
GMD55 SELECT
-1
.
Trouble shooting guide
59
Page 62
$Limited warranty
Disc mower
GMD55 SELECT
60
Limited warranty
Page 63
Disc mower
GMD55 SELECT
Limited warranty
61
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