Spearhead
Multi-Cut
420
17
420 Slip Clutch Maintenance & Settings
Check the condition of the friction discs before use and following periods of storage.
Release the tension from the springs and turn the clutch body while holding the inner
P.T.O hub stationary, if unable to turn freely strip down clutch and free off seized
parts ensuring to remove all traces of rust. Rebuild and adjust the spring
compression to the original setting.
Following seasonal use, unload the spring tension and store clutch assembly in a dry
place. Check condition of friction linings and reset spring compression to original
height before use.
Should the assembly overheat due to frequent or prolonged clutch slipping, dismantle
for inspection. The original thickness of the lining is 3.0 mm, replace them when worn
to 2.0 mm. Clean up all contact surfaces and replace any damaged components
before assembly.
Fig 12 (h)
Fig 12 (f)
Position
Setting
Machine
Part no
33.2 mm
7mm
Centre
1000Nm
420
5770409
33.2 mm
7mm
Wing
1000Nm
420
5770410
Warning
The slip clutch is there to protect the gearbox. If the
blades strike a large obstacle they may get damaged or
break - avoid these conditions.
Fig 12
