MF - Dual Clutch - Technical Advice
MF Dual Clutch - Technical Advice
TECHNICAL ADVICE
SPARE PARTS:

During the 40 year production run, LUK (Laycock) upgraded the linkages, top cover, main and PTO pressure plates by changing component thickness.

If you replace (mix) these items you may well have to do the job again.

New clutches are much cheaper than major repair. Minor repairs should be confined to the components on the next page ... Dual Clutch Components.
PROBLEMS:
P.T.O will not release
  • Normally caused by the PTO plate hub being damaged when the tractor is pushed together. If you find the PTO plate distorted, it will have happened during tractor assembly.
  • If the PTO will not release, try reducing the PTO clutch clearance (through bottom inspection cover).
  • Reducing clearance from .085" to around .060" may eliminate the problem without splitting the tractor.

Clutch Slipping Or Excessive Pedal Travel

  • Did you remove the transport bolts?
  • Has the flywheel been machined without machining the step to correct dimension?
  • Correct pedal clearance (free play)?
  • Did you fit the correct amount of clutch to flywheel shims?
  • Very early gold/grey MF35 may req. extra flywheel shims.
    Confirm pedal clearance during assembly
FLYWHEEL POT DEPTH
12" MF Coil Spring Dual Clutches 39.75mm

11" MF Coil Spring Dual Clutches 44.5mm (45.5mm with clutch shim)

13" MF Spring or Diaphragm Split Torque Clutches 3mm
WARNING !
  • Some late tractors (MF2640 etc) with split torque clutches now have revised flywheel depth to eliminate shims.

  • Very old MF35 (4 cylinder) with Belleville Spring Clutch had non-standard flywheel depth.
    If fitting a new clutch you will probably require two sets of shims.
    Test pedal travel before full assembly.