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KUHN GMD 400 - User Manual

KUHN GMD 400
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ASSEMBLY / OPERATOR'S MANUAL
GMD 400 - 500
GMD 400 HD - 500 HD
MULTIDISC MOWER
N° 95001 C.GB - 03.2003

Table of Contents

Questions and Answers

  • D
    Donna WilsonAug 3, 2025
    Why is my KUHN Lawn Mower leaving uneven stubble?
    • G
      gregorypaulaAug 3, 2025
      Uneven stubble can occur for several reasons. The cutterbar may have too much tilt, requiring a reduction in tilt. The PTO frequency might be too low; increase the engine frequency to run the PTO at 540 min-1. Ensure knives are installed correctly, with the arrow on the knife's upper face pointing in the disc's rotation direction. Check belts for correct tension if the disc frequency is low. Finally, replace dull or broken knives.
  • C
    cheryladamsAug 9, 2025
    What to do if KUHN GMD 400 Lawn Mower has soil built up in front of the cutterbar?
    • S
      scott54Aug 9, 2025
      If soil builds up in front of the cutterbar, this is likely due to very wet conditions or sticky ground. In wet conditions, adjust the main frame height by shortening the chain as necessary. If the ground is sticky, consider fitting a set of raised skids.
  • D
    Donna TorresAug 15, 2025
    Why is the stubble too long with my KUHN Lawn Mower?
    • J
      Joshua NolanAug 15, 2025
      If the stubble is too long, the cutterbar angle is likely incorrect. You should change the cutterbar angle using the tractor top link.
  • G
    Gary MasseyAug 20, 2025
    What to do if KUHN GMD 400 cutterbar is not floating?
    • D
      David BakerAug 20, 2025
      If the cutterbar is not floating, the main frame setting is likely incorrect. Adjust the main frame.
  • D
    dthompsonAug 27, 2025
    Why is my KUHN GMD 400 breaking back too easily?
    • S
      Sarah BaxterAug 27, 2025
      If the machine is breaking back too easily, there is likely insufficient tension on the breakaway spring washers. Tighten the breakaway spring washers.

Summary

Safety

Designated Use of the Machine

Defines the intended purpose and limitations of the mower.

General Safety Recommendations

Outlines fundamental safety principles for operating the machine.

Precautions Before Operation

Lists essential safety checks and actions before starting the mower.

Special Safety Recommendations

Highlights specific safety advice for operation and maintenance.

Safety Decals

Explains the meaning and importance of safety pictograms on the machine.

Safety Breakaway

Details the function and resetting procedure for the cutterbar breakaway system.

Technical Specifications

Assembly Procedures

Mounting Chassis to Cutterbar

Instructions for attaching the main chassis to the cutterbar assembly.

Belt Shield and Hydraulic Hose Assembly

Steps for installing belt guards, belts, and hydraulic hoses.

Frame Pipe and Lift Bracket Assembly

Procedure for assembling the frame pipe and lift bracket components.

Safety Guard and Locking Device Assembly

Instructions for attaching safety guards and the locking mechanism.

Attaching the Mower to the Tractor

Lower Link Attachment and Pin Positioning

Details on connecting lower links and positioning hitch pins for tractor attachment.

PTO Shaft Operation

Working Position and Adjustments

Chassis Height Adjustment

How to set the machine's chassis height relative to the ground.

Cutting Height Adjustment

Procedures for adjusting the cutterbar tilt angle for optimal cutting height.

Transport and Parking the Machine

Operating the Mower

Lubrication

Bevel Gearbox Lubrication

Guidelines for checking and filling oil in the bevel gearbox.

Cutterbar Lubrication

Procedures for checking and adding oil to the cutterbar.

Grease Fittings

Instructions for lubricating pivot and linkage points.

Adjustments and Maintenance

Knife and Securing Element Inspection

Checks for wear and damage on knives and their securing hardware.

Knife Replacement

Step-by-step guide for replacing mower knives.

Disc Replacement

Procedures for removing and installing mower discs.

Belt Tensioning and Replacement

How to check and adjust belt tension and when to replace belts.

Optional Equipment

Hydraulic Adaptors

Details on available adaptors for hydraulic connectors.

Special PTO Shaft

Information on reinforced PTO shafts and when they are recommended.

Kit for Mowing at 40° Below Horizontal

Description of a kit for operating the mower on steep slopes.

Wear Plates

Information on wear plates for disc guards.

Raised Skids

Details on optional raised skids for adjusted cutting height or sticky ground.

Signalling Elements Kit

Instructions for installing optional signalling elements.

Service Adjustment Chart

Storing the Mower

Sound Levels

Limited Warranty

KUHN GMD 400 Specifications

General IconGeneral
BrandKUHN
ModelGMD 400
CategoryLawn Mower
LanguageEnglish

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