KUHN GMD240 Operator's Manual
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KUHN GMD240 Operator's Manual

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Operator's manual
KN204BGB_G
Read carefully before starting the machine
Disc mower
Original instructions
- English - 04-2019
KN204BGB_G

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Stanley Bowen
April 30, 2025

I did not recieve an operators manual with my purchase.

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Summary of Contents for KUHN GMD240

  • Page 1 Operator's manual KN204BGB_G Read carefully before starting the machine Disc mower Original instructions - English - 04-2019 KN204BGB_G...

  • Page 3: Dear Owner

    1. 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.

  • Page 4: Table Of Contents

    Disc mower GMD240 - 280 - 310 2. Contents Dear Owner ........................3 Contents ..........................4 Identification of the machine..................8 Front view ............................8 Rear view ............................8 Model identification plate ......................... 9 Optional equipment........................10 Safety..........................11 Description of symbols used in this document................11 Safety instructions .........................
  • Page 5 Disc mower GMD240 - 280 - 310 Machine specifications....................33 Description and glossary ....................... 33 Technical specifications ......................... 34 Required equipment ........................36 5.3.1 Primary PTO shaft ......................36 5.3.2 Mechanical safety release....................36 5.3.3 Cutter bar ......................... 37 Sound levels ..........................38 Putting into service......................
  • Page 6 Disc mower GMD240 - 280 - 310 Optional equipment......................65 1 3/8’’ - 6 spline pto shaft ....................... 65 32 x 38 - 8 spline pto shaft......................65 High cone disc kit........................... 65 Inner swath disc ..........................66 Inner swath shield .......................... 66 Raised skid shoes..........................
  • Page 7 Disc mower GMD240 - 280 - 310 11. Troubleshooting guide ....................104 12. Appendix........................106 12.1 Calculating the load on an axle ....................106 13. Limited Warranty......................113 2. - Contents KN204BGB_G...

  • Page 8: Identification Of The Machine

    Disc mower GMD240 - 280 - 310 3. Identification of the machine Front view Rear view 3. - Identification of the machine KN204BGB_G...

  • Page 9: Model Identification Plate

    KUHN S.A. 67700 SAVERNE - FRANCE TYPE N° MASSE MADE IN FRANCE Kuhn authorized dealer for any spare parts order or warranty claim. • (1) The manufacturer: • (2) Type : • (3) Serial Number: • (4) Weight: KUHN S.A.

  • Page 10: Optional Equipment

    Disc mower GMD240 - 280 - 310 Optional equipment - Tick box corresponding to the equipment fitted on your machine:  GMD240-280  Inner swath disc.  Inner swath shield.  GMD280  High cone disc kit.  GMD240-280-310 ...

  • Page 11: Safety

    Disc mower GMD240 - 280 - 310 4. Safety Description of symbols used in this document This symbol indicates a potentially hazardous situation that if not avoided, could result in serious bodily injury. This symbol is used to identify special instructions or procedures which, if not followed strictly, could result in machinery damage.

  • Page 12: Safety Instructions

    It is too late to learn once work has been started! Never let anyone operate the machine who is not trained to do so. Should you have any difficulties in understanding any parts of this manual, please contact your KUHN dealer. 4. - Safety KN204BGB_G...

  • Page 13: Precautions To Be Taken Before Carrying Out Any Operations On The Machine

    Disc mower GMD240 - 280 - 310 4.2.3 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.

  • Page 14: Precautions When Driving

    Disc mower GMD240 - 280 - 310 4.2.5 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.
  • Page 15 Disc mower GMD240 - 280 - 310  Lights and indicators - Before transporting the machine on public roads, 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.
  • Page 16 Disc mower GMD240 - 280 - 310 Description of symbols Description Units Description Tractor unladen weight PTAC Gross Combined Weight Rating Unladen load on tractor front axle Empty load on tractor rear axle Axle loads (Tractor + machine) Load on front axle (Tractor + machine)
  • Page 17 Disc mower GMD240 - 280 - 310 • Stage 2: - Couple the machine to the tractor. To measure: - Load on front axle (t1): • Tractor + machine (transport position). To do: - If the front axle load (t1) is below 20% of the tractor tare (T), add ballast weights (M1) to exceed the minimum load on the front axle.

  • Page 18: Maximum Speed

    Disc mower GMD240 - 280 - 310 • Stage 4: To measure: - Load on rear axle (t2): kg kg • Tractor + machine (transport position). • Ballast weights. Checking: - Check in the tractor's operator's manual that the value measured is below the maximum allowed tractor rear axle load.

  • Page 19: Hydraulic Circuit

    Disc mower GMD240 - 280 - 310 4.2.9 Hydraulic circuit Caution! The hydraulic circuit is under high pressure. Maximum pressure at work: 200 bar (2901 psi). - Before connecting hoses to the tractor hydraulics, ensure that tractor and machine circuits are not under pressure.Before disconnecting a hose,...

  • Page 20: Pto Shaft

    Disc mower GMD240 - 280 - 310 4.3.1 PTO shaft - Use only PTO shafts supplied with the machine or recommended by the machine manufacturer. - The protective shield of the tractor PTO stub, the PTO shaft guards and the protective shield of the machine input shaft must always be in place and in good condition.

  • Page 21: Remote Controlled Components

    Disc mower GMD240 - 280 - 310 PTO type Diameter X splines A ±5 mm (0.20’’) 35 mm (1.378’’) 85 mm (3.35’’) 36 mm (1.42’’) 85 mm (3.35’’) 35 mm (1.378’’) 85 mm (3.35’’) 45 mm (1.772’’) 100 mm (4.00’’) 44 mm (1.732’’)

  • Page 22: Waste Disposal

    Disc mower GMD240 - 280 - 310 4.3.4 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.

  • Page 23: Incorrect Use Of The Machine By The User

    Disc mower GMD240 - 280 - 310 4.3.7 Incorrect use of the machine by the user 133996: Specific requirements for countries member of the Eurasian Economic Community (EAC marking): • 133998: Specific requirements for countries member of the Eurasian Economic Community (EAC marking).

  • Page 24: Precautions For Maintenance And Repair Work

    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 (nuts, bolts, etc.).

  • Page 25: Precautions For Machine Use

    Disc mower GMD240 - 280 - 310 4.3.10 Precautions for machine use After each use, check the cutting tools (discs, knives) their attachment hardware 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.

  • Page 26: Location And Description Of Safety Decals On The Machine

    Disc mower GMD240 - 280 - 310 Location and description of safety decals on the machine 4.4.1 Location of safety decals 4. - Safety KN204BGB_G...
  • Page 27 Disc mower GMD240 - 280 - 310 4.4.2 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.
  • Page 28 Disc mower GMD240 - 280 - 310  Rotating cutting tools (3) - 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.
  • Page 29 Disc mower GMD240 - 280 - 310  Manoeuvring area (5) - Stay a safe distance from the machine. Crushing hazard.  Cutting tools (6) The cutting tools and their attachment hardware meet safety and reliability criteria set by standards and by the manufacturer.
  • Page 30 Disc mower GMD240 - 280 - 310  Do not step on the machine (7) - Do not step on the machine : Risk of falling or damaging the protection device.  Projections (8) - Stones and other debris projected by the moving parts can travel a long distance.

  • Page 31: Road Safety Equipment And Recommendations

    Road safety equipment and recommendations The road safety equipment is mounted in the factory or by your authorized Kuhn dealer according to current safety regulations. - Always keep to the legal speed limit for driving a tractor-machine assembly on public roads.
  • Page 32 Disc mower GMD240 - 280 - 310 Likely critical failures • 133993: Specific requirements for countries member of the Eurasian Economic Community (EAC marking). • 133994: Specific requirements for countries member of the Eurasian Economic Community (EAC marking). • 133995: Specific requirements for countries member of the Eurasian Economic Community (EAC marking).

  • Page 33: Machine Specifications

    Disc mower GMD240 - 280 - 310 5. Machine specifications Description and glossary Cutterbar Disk Cutter bar guard Release cord Hitch pin Gearbox Lift cylinder Compensating spring Upper coupling yoke 10 : Parking stand 5. - Machine specifications KN204BGB_G...

  • Page 34: Technical Specifications

    Designated use of the machine The GMD240 - 280 - 310 mowers must only be used for the purpose for which they were manufactured: mowing on the ground of arable meadows, seeded grassland and permanent meadows for the purpose of harvesting fodder for feeding livestock.
  • Page 35 Disc mower GMD240 - 280 - 310 Technical specifications GMD240 GMD280 GMD310 Coupling device 3 613 kg (1351 lb) 668 kg (1473 lb) 711 kg (1567 lb) • Mechanical safety release • Fast fit knives Coupling device 4 624 kg (1376 lb)

  • Page 36: Required Equipment

    Disc mower GMD240 - 280 - 310 Required equipment The machine is factory fitted with the following equipment: 5.3.1 Primary PTO shaft The machines are factory fitted with one of the following PTO shafts: • 1 3/8’’ - 6 spline pto shaft.

  • Page 37: Cutter Bar

    Disc mower GMD240 - 280 - 310 • Mechanical safety release + Hydraulic pivot + Lighting and signalling. 5.3.3 Cutter bar Knife attachment per bolt and nut: • Standard. 5. - Machine specifications KN204BGB_G...

  • Page 38: Sound Levels

    Disc mower GMD240 - 280 - 310 • "HD" discs. • Fast fit knives. Sound levels Sound levels have been measured in accordance with the measuring methods as defined in: • NF EN ISO 4254-1 «Agricultural machinery - Safety - Part 1: General requirements».

  • Page 39: Putting Into Service

    Disc mower GMD240 - 280 - 310 6. Putting into service Description of control elements The machine is fitted with a release cord operated from the tractor cab. The machine is supplied with an 18 mm box wrench (1) to carry out certain adjustment and maintenance tasks.

  • Page 40: Coupling And Uncoupling

    Disc mower GMD240 - 280 - 310 Coupling and uncoupling The machine adapts to tractors fitted with a 3 point linkage category 2. 6.2.1 Description of coupling elements • A PTO shaft (1). • A release cord (2). • 1 hydraulic hose controlling the machine transport/work position cylinder (3).
  • Page 41 Disc mower GMD240 - 280 - 310 Machines fitted with a 540 min-1 central gearbox must be driven by a power-take-off rotating at 540 min-1. - Select the speed of 540 min-1 inside the tractor. When the following equipment is fitted: •...

  • Page 42: Preparing The Machine

    Disc mower GMD240 - 280 - 310  Lateral adjustment of the lower links - Distribute the play on each side of the lift linkage. - Check that the stabilisers function properly (Adjustment, Locking / Unlocking). 6.2.3 Preparing the machine ...
  • Page 43 Disc mower GMD240 - 280 - 310 If measure A is comprised between 2.10 mm (6’11") ad 2.25 mm (7’04"): - Place lower links in position b. Adjust the hitch pins: - Loosen the 8 screws (3). - Centre hitch pin (1) with regards to the mounting plate.

  • Page 44: Coupling The Machine

    Disc mower GMD240 - 280 - 310  Positioning of lower links - Measure dimension E. - Adjust the side stabilizers of the tractor's lower links to obtain a measure E of 50 mm (2"). 6.2.4 Coupling the machine - Lower the tractor three-point linkage.

  • Page 45: Hydraulic Connections

    Disc mower GMD240 - 280 - 310 When optional equipment is used, follow specific procedures mentioned in the related section: • Optional equipment / Chain stroke limiter. - Place release cord handle in the tractor cab. - Lift machine using tractor hydraulic lift linkage.

  • Page 46: Electrical Connection

    Disc mower GMD240 - 280 - 310 When the following equipment is fitted: Mechanical safety release + Hydraulic pivot + Lighting and signalling - Connect the hydraulic hoses for the mechanical safety release with hydraulic pivot to the additional double acting valve.
  • Page 47 Disc mower GMD240 - 280 - 310 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.

  • Page 48: Adjusting The Machine

    Disc mower GMD240 - 280 - 310 6.2.8 Adjusting the machine  Frame height - Proceed with adjustment on flat and even ground. Tractor fitted with a hydraulic position control function: - Lower mowing unit on the ground. - Lower tractor lift linkage in order to engage lift stop (1) in its housing.
  • Page 49 Disc mower GMD240 - 280 - 310 - Place the cutterbar in horizontal position. - Release parking lock (1). - Engage parking latch behind the bevel gearbox mounting plate (2). - Make sure no foreign material is located on the bevel gearbox.
  • Page 50 Disc mower GMD240 - 280 - 310 - Uncouple the PTO shaft. - Place PTO shaft in holder (1). - Disconnect and store hydraulic hose in holder (2). - Remove cord from tractor and store it in its holder on the machine.

  • Page 51: Instructions For Transport

    Disc mower GMD240 - 280 - 310 7. Instructions for transport Before placing the machine into transport position: - Wait until the rotating parts have come to a complete stop. - Check that nobody is located in the machine pivoting area. If there is someone, make sure the person moves away.
  • Page 52 Disc mower GMD240 - 280 - 310 When the following equipment is fitted: Mechanical safety release + Hydraulic pivot + Lighting and signalling - Pull release cord until lift stop (1) is free. - Lift the machine using the tractor's lift linkage.
  • Page 53 Disc mower GMD240 - 280 - 310 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.

  • Page 54: Instructions For Work

    Disc mower GMD240 - 280 - 310 8. 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. Putting the machine into work...
  • Page 55 Disc mower GMD240 - 280 - 310 When the following equipment is fitted: Mechanical safety release - Place the single acting valve of the mowing unit lift cylinder in floating position to fully lower the mowing unit. - Lower the tractor lift linkage in working position.

  • Page 56: Putting The Machine In Headland Turn Position

    Disc mower GMD240 - 280 - 310 - Coordinate manoeuvres to prevent any interference between the tractor and the guard front flap. When working, the mowing unit must also be fully pivoted frontwards. During work, only use the mowing unit lift cylinder to place the machine in headland turn position.

  • Page 57: Adjustment

    Disc mower GMD240 - 280 - 310 8.2.1 Adjustment - Activate single acting valve of the transport/work positioning cylinder in the transport position direction. - Measure dimension X: • The measure X must equal 4 mm(0.16’’) +/- 2 mm(0.08’’). If size X is not correct:...

  • Page 58: Cutting Height

    Disc mower GMD240 - 280 - 310 8.3.1 Cutting height The desired cutting height is obtained directly by adjusting the top link length. The height can be adjusted between 30 and 50 mm (1.1" - 1.9"). To obtain a different cutting height: - Place the machine in working position.

  • Page 59: Compensating Spring Tension

    Disc mower GMD240 - 280 - 310 - Check that there is a minimum clearance (J) of 15 mm (0.59’’) between the cone rib and the swath wheel. 8.3.3 Compensating spring tension The mowing unit is suspensed by means of compensating spring (1).

  • Page 60: Machine Use

    Disc mower GMD240 - 280 - 310 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.

  • Page 61: Headland Turn Maneuvers

    Disc mower GMD240 - 280 - 310 8.4.1 Headland turn maneuvers - Manoeuvre the cutterbar using the setting into transport/work position cylinder. - Activate single acting valve of the transport/work positioning cylinder in the transport position direction: • Prompted by the limiter adjustment screw (1), the headland turn valve (2) shuts off the supply to the transport/work positioning cylinder.

  • Page 62: Machine Safety

    Disc mower GMD240 - 280 - 310 8.4.3 Machine safety When hitting an obstacle: - Before carrying out any maintenance or repairs on the machine, switch off the tractor engine, remove ignition key, wait until all moving parts have come to a standstill and apply park brake.
  • Page 63 Disc mower GMD240 - 280 - 310 The break-away latch allows the cutter bar to pivot to the rear when hitting an obstacle. - In case an obstacle has been struck, check that the mowing unit has not been damaged.
  • Page 64 Disc mower GMD240 - 280 - 310 In case of clogging: - Before carrying out any maintenance or repairs on the machine, switch off the tractor engine, remove ignition key, wait until all moving parts have come to a standstill and apply park brake.

  • Page 65: Optional Equipment

    Disc mower GMD240 - 280 - 310 9. Optional equipment 1 3/8’’ - 6 spline pto shaft GMD240-280-310: A specific pto shaft is available as option for tractors equipped with a 1 3/8’’ - 6 spline pto stub. 32 x 38 - 8 spline pto shaft...

  • Page 66: Inner Swath Disc

    Disc mower GMD240 - 280 - 310 Inner swath disc GMD240-280: The swath width equals 1.80 m (5’10’’) depending on the forage density. GMD280: Use this kit in combination with the high cone disc kit. Inner swath shield GMD240-280: The inner swath shield allows reducing the swath width to approximately 1.20 m (3’11") depending on...

  • Page 67: Raised Skid Shoes

    Disc mower GMD240 - 280 - 310 Raised skid shoes GMD240-280-310: The raised skid shoes allow mowing higher, between 35 mm (1.4’’) and 90 mm (3.5’’). Replace the end disc skids by the 2 raised skid shoes. raised skid shoes also recommended on sticky grounds.

  • Page 68: Side Deflector With High Cone Disk

    Disc mower GMD240 - 280 - 310 Side deflector with high cone disk GMD240-280-310: Large cone discs allow mowing dense or down crops with long stems. The side deflector prevents crop from wrapping around the outer large cone disk when mowing in dense or down crops with long stems.

  • Page 69: Chain Stroke Limiter

    Disc mower GMD240 - 280 - 310  Linkage adjustment - Measure dimension A. If measure A exceeds 2.40 m (7’10"): - Position lower links: Adjust the hitch pins: - Loosen the 8 screws (3). - Position hitch pin (2) at a distance of H = 10 mm ((0.4")).

  • Page 70: Adjusting The Machine

    Disc mower GMD240 - 280 - 310  Frame height adjustment - Lower tractor lift linkage to obtain a distance (H) slightly exceeding 450 mm ((1’5’’)) between the hitch pins and the ground. - Attach hook of check chain supplied with the machine in one of the upper holes of the tractor top link yoke.

  • Page 71: Lighting And Signalling

    Disc mower GMD240 - 280 - 310 9.12 Lighting and signalling GMD240-280-310: The machine can be fitted with specific signalling lights to comply with the road regulations. 9.12.1 Electrical connection - Connect machine 7-pin plug on the tractor 7-pin socket.

  • Page 72: Lighting And Signalling (Only For Usa)

    Disc mower GMD240 - 280 - 310 9.14 Lighting and signalling (Only for USA) GMD240-280-310: The machine can be fitted with specific signalling lights to comply with the road regulations. 9.15 Quick hitch connector GMD240-280-310: This equipment enables coupling the machine to a tractor fitted with a U (Quick Hitch) frame connector.

  • Page 73: Wear Skids

    Disc mower GMD240 - 280 - 310 9.17 Wear skids GMD240-280-310: Wear skids can be welded underneath the disk guard to improve its resistance to wear in difficult working conditions. 9. - Optional equipment KN204BGB_G...

  • Page 74: Maintenance And Storage

    Disc mower GMD240 - 280 - 310 10. Maintenance and storage - Before carrying out any maintenance or repairs on the machine, switch off the tractor engine, remove ignition key, wait until all moving parts have come to a standstill and apply park brake.

  • Page 75: Lubrication

    Disc mower GMD240 - 280 - 310 Lubrication Grease • The release sheath.  • The leg pin. • The 3-point hitch frame vertical pivot point.  - The moving parts and pivot points. Oil change   - The cutterbar.

  • Page 76: Pto Shaft

    Disc mower GMD240 - 280 - 310 The pictorials show the points to be greased. - Clean grease nipples before greasing. - Lubricate with multi-purpose grease grade NLGI 2. 10.2.1 PTO shaft - Place the machine in working position. - Stop the tractor engine and remove ignition key.

  • Page 77: Grease

    Disc mower GMD240 - 280 - 310 10.2.2 Grease • The release sheath. When the following equipment is fitted: Mechanical safety release - Loosen nut (1) to release lock (2). - a: Remove tie-rod (1). - Grease the release sheath inside.
  • Page 78 Disc mower GMD240 - 280 - 310 • The release sheath. When the following equipment is fitted: Mechanical safety release + Hydraulic pivot + Lighting and signalling - Loosen nut (1) to release lock (2). - a: Extend cylinder (1).

  • Page 79: Draining

    Disc mower GMD240 - 280 - 310 • The leg pin. • The 3-point hitch frame vertical pivot point. 10.2.3 Draining  The cutterbar Before draining oil, operate the machine for a few minutes so that the oil warms up.
  • Page 80 Disc mower GMD240 - 280 - 310 GMD240 GMD280 GMD310 Oil volume 2-L(0.53 US gal) 2.25-L(0.59 US gal) Type of oil Gear oil When draining and refilling, it is recommended to use a synthetic base oil, type PAO (Poly-Alpha-Olefins) with a viscosity grade equivalent to SAE 80W90.
  • Page 81 Disc mower GMD240 - 280 - 310 Checking cutterbar oil level: - The oil must reach the lower edge of the filling hole (1). - Clean and reinstall filler plug (1) and its washer. Replace if necessary.  The angle gearbox - Before draining oil, operate the machine for a few minutes so that the oil warms up.

  • Page 82: Maintenance

    Disc mower GMD240 - 280 - 310 From the transport position: - Remove filler plug (1) and its washer. - Place a container of sufficient capacity under drain plug (2). - Remove drain plug (2) and its washer. - Allow oil to drain completely.

  • Page 83: Belt Tension

    Disc mower GMD240 - 280 - 310 10.3.1 Belt tension 0 - 1 mm - Regularly check belt tension and in particular during the first hours of use. - Never replace belts individually. - Replace belts in full sets. 59950100 ...
  • Page 84 Disc mower GMD240 - 280 - 310 - Place cutter bar in vertical position. - Wait one hour for the oil to accumulate in the lower part of the cutter bar. - Remove filler plug (1) and its washer. - Check the oil level: The oil must reach the lower edge of the filling hole (1).

  • Page 85: Check Angle Gearbox Oil Level

    Disc mower GMD240 - 280 - 310 10.3.3 Check angle gearbox oil level - Regularly check the oil level: - Place the cutterbar in horizontal position. - Remove drain plug (1) and its washer. - Check the oil level: The oil level must reach the lower edge of the emptying hole (1).

  • Page 86: Inspection Of Knives And Securing Elements

    Disc mower GMD240 - 280 - 310 10.3.5 Inspection of knives and securing elements - Immediately replace worn or damaged parts with genuine KUHN parts. When the following equipment is fitted: • Knife attachment per bolt and nut.  Knives...
  • Page 87 Disc mower GMD240 - 280 - 310 GMD240 GMD280 GMD310  Securing elements - Check the securing elements: • After hitting an obstacle. • When replacing knives. • At the beginning of each season. 10. - Maintenance and storage KN204BGB_G...
  • Page 88 Disc mower GMD240 - 280 - 310 - The fixing bolts should be changed in the following cases (2): • 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.
  • Page 89 Disc mower GMD240 - 280 - 310 Removal: - 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.
  • Page 90 Disc mower GMD240 - 280 - 310  Disc replacement - Place a wooden wedge (2) between two discs to stop them from moving. - Remove 2 bolts (1) and their spring washers using the box spanner supplied with the machine.
  • Page 91 Disc mower GMD240 - 280 - 310 - Check if there is still a minimum gap X = 1 mm (0.04’’) between the disk lower part and the cutter bar wear plates. - If this is not the case, fit one (maximum two) spacer(s) between the disc and the mounting hub.
  • Page 92 Disc mower GMD240 - 280 - 310  Knives - Inspect systematically all knives before the machine is operated to: • ensure the cutting quality. • ensure safety in use. • Prevent cutterbar damage risks. - Replace knives in the following cases: •...
  • Page 93 Disc mower GMD240 - 280 - 310 GMD240 GMD280 GMD310  Securing elements - Check the securing elements: • After hitting an obstacle. • When replacing knives. • At the beginning of each season. 10. - Maintenance and storage KN204BGB_G...
  • Page 94 Disc mower GMD240 - 280 - 310 - 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.
  • Page 95 Disc mower GMD240 - 280 - 310 - Replace spring plate in the following cases: • When there is visible distortion. • When you have noticed substantial wear on a spring plate: Width B of a spring plate, measured at A = 20 mm (0.8’’), must exceed 60 mm (2.4’’).
  • Page 96 Disc mower GMD240 - 280 - 310 Removal: - Clean the top side of the disk guard. - Clean cavities between disc and spring plate. - Slightly hit all ground residues between the knife and the screw with a mallet to remove them.
  • Page 97 Disc mower GMD240 - 280 - 310 Fitting 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. Fast fit knives: • Knife for disk rotating to the left (a).
  • Page 98 Disc mower GMD240 - 280 - 310 • Checking the full locking and free rotation of the knife on the screw head. - Check that screw head (2) is free to slide in spring plate hole (3). - Remove special tool.
  • Page 99 Disc mower GMD240 - 280 - 310  Disc replacement - Place a wooden wedge (2) between two discs to stop them from moving. - Remove 2 bolts (1) and their spring washers using the box spanner supplied with the machine.

  • Page 100: Spring Plate Replacement

    Disc mower GMD240 - 280 - 310 - Position conical centre of spring washer at the top. - Tighten screws: • Torque: 12.3 daNm (91 lbf ft). 10.3.6 Spring plate replacement - Remove the disc: - See section: Maintenance and storage / Maintenance / Disc replacement.

  • Page 101: Outer And Inner Cones

    Disc mower GMD240 - 280 - 310 10.3.7 Outer and inner cones - Check torque of attachment bolts (1) of outer and inner cone covers (2) and (3): • Torque: 6 daNm (44 lbf ft). Cover: • (2): Outside. • (3): Inside.

  • Page 102: At The Start Of Each Season

    Disc mower GMD240 - 280 - 310 10.4.2 At the start of each season - Re-read the operators' manual. - Wipe off grease on cylinder rods. - Inspect and replace worn knives and bolts. - Check that all nuts and bolts are sufficiently tightened.

  • Page 103: Storage

    Disc mower GMD240 - 280 - 310 10.5.1 Storage • 139884: Specific requirements for countries member of the Eurasian Economic Community (EAC marking). • 139885: Specific requirements for countries member of the Eurasian Economic Community (EAC marking). • 139886: Specific requirements for countries member of the Eurasian Economic Community (EAC marking).

  • Page 104: Troubleshooting Guide

    Disc mower GMD240 - 280 - 310 11. Troubleshooting guide    Problem Cause Remedy Uneven stubble. Dull or broken knives. - Replace knives. Knives not installed - Make sure the arrow on correctly. the knife upper face is pointing in the disc's direction of rotation.
  • Page 105 Disc mower GMD240 - 280 - 310 Stubble too long. Incorrect cutter bar pitch - Modify pitch angle using angle. top link. Machine too light. - Adjust compensating spring tension. - Check frame position. Too frequent safety Insufficient spring washer - Increase spring washer breakback release.

  • Page 106: Appendix

    Disc mower GMD240 - 280 - 310 12. Appendix 12.1 Calculating the load on an axle When coupling a tool to the front and/or rear 3-point lift linkage, the maximum authorized payload must not be exceeded. When coupling tools to the front and/or rear 3-point lift linkages, the maximum load on tractor's tires must not be exceeded.
  • Page 107 Disc mower GMD240 - 280 - 310 Obtained Description Units Description Tractor unladen weight Unladen load on tractor front axle Empty load on tractor rear axle Axle loads (Tractor + machine) Load on front axle (Tractor + machine) Load on rear axle (Tractor + machine)
  • Page 108 Disc mower GMD240 - 280 - 310  Front tool: 2) Calculation of the minimum front ballast weight M2 minimum      M1 a T2 b – 0 45 ---------------------------------------------------------------------------- - M2minimum minimum - Write the minimal additional weight in the chart.
  • Page 109 Disc mower GMD240 - 280 - 310  Table: Actual value obtained Value authorized Double value of the by calculation according to operator's authorized capacity manual per tyre (2 tyres) Minimum front/rear ballasting Total weight < Load on front axle <...
  • Page 110 Disc mower GMD240 - 280 - 310  Determining the machine weight (M2) and the position of its centre of gravity (d) If the data required to calculate the total weight, axle loads and minimum ballasting are not supplied, use the following method.
  • Page 111 Disc mower GMD240 - 280 - 310 T2: Load on rear axle. • Tractor only. T2 = _____kg T2 = ________ kg  Rear tool or front-rear combination: If the total unit weight exceeds the tractor Gross Combined Weight Rating accordance with the countrie's legislation, empty the hopper to travel on public roads.
  • Page 112 Disc mower GMD240 - 280 - 310 - t: Axle loads. • Tractor + machine. • Hopper empty. t = _____kg t = ________ kg Calculating the rear tool weight (M2): • M2 = T - t Calculating the distance (d): •...

  • Page 113: Limited Warranty

    KUHN equipment from an authorized KUHN dealer, that such equipment is, at the time of delivery to such purchaser, free from defects in material and workmanship, and that such equipment is covered under this Limited Warranty providing the machine is used and serviced in accordance with the recommendations in the Operator's manual.
  • Page 114 - The warranty claim is completed on line via extranet - www.kuhn.com or submitted on a KUHN warranty claim form and returned to the Company within one month after the date of failure or the date of problem becoming apparent.
  • Page 115 $Specimen of the "Declaration of conformity" EC Declaration of conformity (European directive 2006/42/CE) The manufacturer: Manufacturer name and address declares that the product described hereafter: Brand Brand Machine Machine Type / Model : Type / Model Serial no. Serial no. - conforms to the requirements of the European directive 2006/42/CE.
  • Page 116 KUHN S.A. - B.P. 50060 - F - 67706 SAVERNE CEDEX (FRANCE) KUHN-AUDUREAU SAS - B.P. 19 - F - 85260 LA COPECHAGNIERE (FRANCE) KUHN-BLANCHARD SAS - 24, route de Nantes - F - 44680 CHEMERE (FRANCE) KUHN-HUARD SAS - B.P. 49 - F - 44142 CHATEAUBRIANT CEDEX (FRANCE) KUHN-GELDROP B.V.

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