KUHN GMD33 N User manual

ASSEMBLY / OPERATOR'S MANUAL
GMD 33 N
Multidisc Mower
N° 95005 A.GB - 10.2002

DEAR OWNER,
In buying a KUHN machine you have chosen wisely. Into it have gone years of thought,
researchandimprovements.Youwillfind,ashavethousandsofownersallovertheworld,that
you have the best that engineering skill and actual field testing can produce. You have
purchased a dependable machine, but only by 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.Theperformanceyougetfromthismachineislargelydependantuponhowwellyou
readandunderstandthismanualandapplythisknowledge.PleaseDONOTASSUMETHAT
YOU KNOW HOW TO OPERATE AND MAINTAIN YOUR MACHINE before reading this
manual carefully. KEEP THIS MANUAL AVAILABLE FOR REFERENCE.
YourKUHN dealerwillinstruct youonthegeneral operationofyourmachine. Heisinterested
that you get the best performance possible and will be glad to answer any special questions
that may arise regarding the operation of the KUHN machine.
Your KUHN dealer can offer a complete line of genuine KUHN service parts.
These parts are manufactured and carefully inspected in the same factory that builds the
machine to assure high quality and accurate fitting of any necessary replacements.
When ordering service parts it is important that you indicate the type of machine concerned
and its serial number.
Forthisreasonpleasecompletethemodelidentificationplatediagrambelowwiththerequired
information. This will provide you with an easy reference for future service parts orders.
ABOUT IMPROVEMENTS
KUHN iscontinuallystriving to improveitsproducts and,therefore,reserves the righttomake
improvements or changes when it becomes practical to do so, without incurring any
obligations to make changes or additions to the equipment sold previously.

- 1 -
CONTENTS
Page
Safety 2
Safety decals 8
Assembly instructions 10
Technical specifications 13
Adapting to the tractor 13
P.T.O. shaft 15
Transport position 16
Working position - Adjustments 18
Cutting height 19
Safety breakaway 20
Ground pressure 20
Parking the machine 20
Operating the mower 21
Lubrication 22
Adjustments and maintenance 24
Inspection of knives & securing elements 26
Optional equipment 28
Trouble shooting guide 29
Storing the mower 29
Limited warranty 31
Copyright 2002 KUHN S.A.

- 2 -
SAFETY
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 OFTHE MACHINE
The GMD 33 N Disc Mower must only be used for the work which it has been designed : mowing on the ground
ofhayfields,grasssilagefieldsandimprovedpasturesforthepurposeofharvestingfodderforfeedinglivestock.
Themanufacturerisnotheldliableforanydamageresultingfrommachineapplicationsotherthanthosespecified
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 33 N Disc Mower 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.

- 3 -
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. Inadditiontotherecommendationsgiveninthismanual,legislationonworksafetyandaccidentprevention
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. Once at work, it is too late to do so !
5. Do not wear loose clothing which could become caught up in moving elements.
6. Useatractorequippedwithasafetycab.Keepwindowsandroofhatchclosedforreducedsoundlevelwhile
operating the PTO driven implement.
7. Beforestartingupthemachineandbeginningwork,checkthesurroundingarea(bewareofchildren!).Make
surethereissufficientvisibility.Keepallpeopleandanimalsawayfromthedangerzoneofthemachine(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.
Ballastisto be placed onthesupportsprovidedinaccordancewithinstructionsof 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.
16. All operating controls (cords, cables, rods ...) must be positioned so that they cannot be set off accidently,
risking accident or damage.

- 4 -
17. Beforetransportonpublicroads,locatethemachineintoitstransportpositionasinstructedinthisoperator’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. Beforeoperatingthemachine,ensurethatallsafetyguardsarefirmlyinplaceandingoodcondition.Ifworn
or damaged, replace immediately.
23. Beforeoperatingthemachine,checktightnessofnutsandbolts,particularlyontoolfixingelements(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. Beforeanyadjustments,maintenanceorrepairsarecarriedout,ensurethatthemachinecannotbestarted
up accidentally.

- 5 -
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. Donotstandbetweenthetractorandthemachinewhenoperatingtheoutercontrolleveroftheliftmechanism.
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. Only use PTO shaft supplied with the machine or recommended by the manufacturer.
2. PTO guards must always be in place and in good condition.
3. Check for correct PTO overlap when at work and in transport.
4. Before attaching or removing the PTO shaft, disengage PTO shaft, turn off engine and remove ignition key.
5. If a primary PTO shaft is equipped with a slip clutch or a free wheel, these must be fitted on the machine
PTO.
6. Ensure that PTO 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 PTO, ensure that PTO frequency and direction are in accordance with manufacturers
recommendations.
9. Before engaging PTO, keep all people and animals clear from the machine.
10. Never engage PTO shaft when tractor motor is turned off.

- 6 -
11. Never surpass PTO angle recommended by the manufacturer.
12. WARNING! Rotating elements can continueturning momentarily afterPTO is disengaged.Keep clearuntil
all rotating elements are at a standstill.
13. When removing the machine, locate PTO shaft on the supports provided.
14. Fit safety cap on tractor PTO.
15. Replace any worn or damaged PTO guards immediately.
MAINTENANCE
1. Before checking any machine malfunction and before adjusting, maintaining or repairing the machine,
disengage PTO, 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.

- 7 -
SPECIAL SAFETY RECOMMENDATIONS
1. Stay a safe distance away from the mower when discs are rotating.
2. 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.
3. Eachtimebeforeusingthemower,inspectconditionofcuttingelements(knives,discs).Replaceanymissing,
worn or damaged cutting elements immediately. Use only genuine KUHN spare parts.
4. Toavoidcreatingdangerousoutofbalanceforces,alwaysreplacemissing,damagedorwornknivesinpairs.
5. When replacing knives or discs, systematically inspect their securing elements as per the manufacturer’s
recommendations.
6. Regularly inspect the disc mower’s protection cover. Worn or damaged protection covers must be replaced
immediately.
7. Protectiondevices(suchasguards,shieldsetc.)areintendedtopreventstones,rocksorotherforeignobjects
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.
8. 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.
9. PTOdrivetothemowermustneverbeengagedunlessthecutterbarskidshoesareincontactwiththeground
and the protective cover is folded down.
10.Ground of the pastures to be mown must be free of foreign objects.
11.Even when the machine is used in accordance with it purpose, objects may be projected. It is therefore
imperativethateveryonebekeptawayfromthedangerzone,thatextracareistakenandthatextra precaution
(such as safety indicators) be taken when mowing pastures alongside roads or near public areas (parks,
schools etc.).
12.Never mow in reverse.
13.When disengaging the PTO drive, moving parts continue to rotate for some time. Wait for all moving parts
to come to a complete stop before approaching the machine.
14.Ifanobstructionishit,stopthetractorimmediately,disengagePTOdrive,turnoffengine,removeignitionkey
and wait for all moving parts to come to a complete stop.
Check the entire machine for any damage before resuming work.
15.Itisstronglyrecommendedtohaveyourmachinecheckedbyyourdealeraftereachseason,especiallyblades
and discs and their fixing devices (nuts, bolts etc.).

- 8 -
SAFETY DECALS
THE FOLLOWING SAFETY DECALS HAVE BEEN PLACED ON YOUR MACHINE IN THE AREAS
INDICATED. THEY ARE INTENDED FOR YOUR PERSONAL SAFETY AND FOR THE SAFETY OF
THE PEOPLE WORKING WITH YOU. WITH THIS MANUAL, WALK AROUND YOUR MACHINE AND
NOTE THE CONTENT AND LOCATION OF THESE WARNING SIGNS. REVIEW THESE DECALS
AND THE OPERATING INSTRUCTIONS IN THE MANUAL WITH YOUR MACHINE OPERATORS.
KEEP THE DECALS LEGIBLE. IF THEY ARE NOT, REPLACE THEM.

- 9 -

- 10 -
ASSEMBLY INSTRUCTIONS
The terms right, left, forward and behind apply when standing behind the machine looking in the forward
direction.
It is important to read the following assembly instructions very carefully so that when delivered to the end user,
the machine is assembled correcty.
MACHINES ARE PACKED IN OPEN-BOARDED WOODEN CRATES (for overseas delivery).
The GMD 33 N are shipped two a crate having each cutterbar fixed to a support strut. Non pre-assembled parts
are also packed in this crate.
Photo 1 : Component parts.
1. Basic machine
2. 3-point frame
3. Inside guard
4. PTO shaft
5. Safety frame
6. Guard rails
7. Safety cover
8. Tool box

- 11 -
1. Mounting of 3-point frame
Fix the 3-point frame (A) under the cross strut with 2 U-bolts (B) and 4 nuts (M 14) (torque 13 daNm - 96 ft.lbs)
(photo 2).
Connect the 4 PVC cords (P) with their linch pins to the securing pins of link arms (X and Y) as shown in
photo 2 A.
Fit positioning chain (Q) to the left-hand link (X) taking care to insert washer (R) (16,5 x 35 x 3,5) between the
linch pin and chain (phto 2 A).
FOR YOUR SAFETY, MAKE SURE THAT THE BASIC MACHINE IS STABLE.
2. Mounting the safety frame and inside guard
Fit the safety frame (C) using 4 bolts (D) (M 10 x 25)
(photo 3). (Torque 6 daNm - 43 ft.lbs). Fit the inside guard (E) with 3 bolts (F) (M 10 x 20), 3 washers and 3 self-locking nuts (photo 4).

- 12 -
4. Assembly of safety guard and protec-
tion cover
Fit the front guard rail (G) into the safety frame (C)
and secure using 2 split pins (photo 5 A).
The end of this guard should be fixed to the skid
shoe using one bolt (N) (M 10 x 25) and one self-
locking nut.
Fitthe rear guardrail(H) into thesafety frame hinges
(P) and secure using 2 split pins. Attach securing
strap (I) (photo 5 A).
Attach white (S) and red (O) reflectors using 2
serrated head bolts (M 5 x 25) and 2 self-locking
nuts (M 5) (photo 5 A).
Check the good functioning of the safety guard lock
(V) (photo 5).
Unfold the protection cover (J) and fix :
- to the safety frame using 3 securing straps (K),
- to the front guard rail using 3 securing straps (L),
- to the rear guard rail using 3 securing straps (M).
5A
3. Mounting of the safety guard lock
Mounttherollpin(T)(diameter8) on the plate located
at the end of the safety guard frame (C) (photo 5).
Fix the lock (V) with a self-locking screw (U) (M12 x
35) making sure to place it against the roll pin (T)
(photo 5). Tighten the screw (U) at a torque of 8.5
daNm / 60 ft.lbs.
5
THE SAFETY COVER SHOULD ALWAYS BE IN PLACE WHEN WORKING AND ITS REAR
FLAPS LOWERED. NEVER LEAN AGAINST, SIT OR STAND ON SAFETY COVER.

- 13 -
TECHNICAL SPECIFICATIONS
Number of discs 3
Working width 1.20 m (47")
Width in transport position 1.80 m (70")
Rotational frequency of discs at 540 min-1 on PTO 3 030 min-1
Theoretical power requirement at PTO 14 kW (19 hp)
Weight 210 kg (462 lbs)
Cutterbar oil capacity 1,30 l
[quality SAE 80 W EP (GL4)] (2.75 US pints/2.28 Imp pints)
The GMD 33 N disc mower is designed for tractors having a PTO frequency at 540 min-1 and equipped with
standard 3-point linkage, cat. 0, 1 or 1 N (vineyard).
IF THE TRACTOR POWER IS INSUFFICIENT, QUALITY OF WORK WILL BE AFFECTED.
ADAPTING TO THE TRACTOR
1. Connect the lower links tothelinkpinsandsecure
using linch pins (N).
2. Fix the top link (O) with pin (P). Depending on
the category of linkage, there are 3 adaptation
possibilities for top link.

- 14 -
Standard category 1 linkage:
- Lower links outside the 3-point frame fitted
to 22 mm diameter pins.
- Top link (3rd point) fitted to upper 19 mm
diameter hole.
Standard category O linkage :
- Lower links inside the 3-point frame fitted to
19 mm diameter pins.
- Top link (3rd point) fitted to lower 16 mm
diameter hole.
Standard category 1 N linkage :
- Lower links inside the 3-point frame fitted to
22 mm diameter pins after having fixed the
link arms (R and S) inside the attachment
frame (Q).
- The 22 mm pins should be facing the inside.
Fitting to wide wheelbase tractors :
- In order to have maximum offset of the frame and
maintain distance (X), a frame offset kit can be
used (see optional equiment, page 28).
NOTE : Depending on the type of tractor being used, the distance (X) should be approximately 50 mm (2"). If
necessary, offset frame (Q).

- 15 -
PTO SHAFT
Connect the PTO shaft to the 540 min-1 tractor drive.
Make sure PTO length is correct :
1°When the PTO is in its maximum extended position, a minimum tube overlap of 100 mm (4") must be
maintained.
2°When the PTO is in its maximum overlap position (retracted), tubes should not butt against the yokes. As a
safety measure a clearance of at least 1 cm (0.4") must be maintained (fig. 12). If this is not the case, shorten
the two transmission tubes and the two guard tubes by the same length (fig. 13 and 14). Bevel and clean the
tubes (fig. 15) and grease the inside of the outer tube (fig. 16).
3°Never operate the PTO at too great an angle (30° maximum) (fig. 17).
These recommendations and adjustments must be respected to avoid damage or premature wear
of the PTO.
Never connect the PTO to the 1000 min-1 tractor drive.

- 16 -
To avoid accidents which could be serious, make sure that the guards are always correctly
in place and secured with the safety chains. On machine side the safety chain should be
attached to the 3-point hitch reinforcing plate (photo 17). Damaged guards should be
replaced immediately.
TRANSPORT POSITION
BEFORE TRANSPORTING THE MOWER ON PUBLIC ROADS, THE OPERATOR MUST
ALWAYSMAKESURETHATTHEMACHINECONFORMSTOTHELEGISLATIONGOVERNING
THE USE OF AGRICULTURAL VEHICLES ON THE ROAD.
BEFORE PUTTING THE MACHINE IN ITS TRANSPORT POSITION (photo 18), DISCONNECT
THE PTO SHAFT AND WAIT FOR ALL MOVEMENT TO STOP.
NEVER STAND BETWEEN THE FRAME AND THE CUTTERBAR WHEN IT IS BEING
PIVOTED INTO TRANSPORT POSITION.

- 17 -
When transporting the machine on a public highway or from one field to another proceed as follows :
- disengage PTO shaft and wait until all rotating elements have come to a complete stop,
- raise the machine using the hydraulic 3-point lift,
- lock the pivoting lower left link into place using handle (P) (photo 22),
- fold back the protection cover over the guard (photo 20),
- using a box spanner (A) delivered with the machine exert pressure to free the lock pin (arrow no. 1) and fold
the rear guard flap towards the front (arrow no. 2) (photo 20) over the front guard flap,
- lock the box spanner back into place (photo 22),
- connect the front and rear guard flaps using the strap (L) (photo 21),
- unlock the cutterbar by retracting the pin (V) (photo 19),
- fold the cutterbar towards the rear behind the main frame (photo 21),
- extend the pin (V) (photo 19) to lock the cutterbar in the transport position.

- 18 -
WORKING POSITION AND ADJUSTMENTS
To place the GMD 33 N into the working position proceed as follows :
- unlock the cutterbar by retracting the pin (V) (photo 23),
- pivot the cutterbar into the working position (photo 24) and lock it into this position,
- open the strap (L) (photo 21), fold the rear guard flap (R) upwards and towards the rear (photo 25) until it is
automatically re-engaged in the working position and lower the protection cover around the guard,
- release the lower left link by pulling back the handle (P). Fix handle (P) in one of the unused mounting holes
on the three point frame (photo 26).