Spearhead
Multi-Cut
420
12
Machine Protection
To prevent gearbox damage all rotors are protected by slip clutches fitted to each of
the three rotor gearboxes. When cutting in extreme conditions where stumps, rocks
and other such solid objects are likely to be found it is recommended that the
operator reduces the engine revs to allow the blades to pivot more easily when
striking solid objects, and proceed with caution.
The clutch settings should not be altered without reference to Service and
Maintenance. Never over-tighten the pressure springs on the slip clutches (Fig. 7) as
this could result in severe damage to the gearbox and drive lines, as well as
invalidating the warranty.
If the machine has been laid up for any length of time, there is a risk of the
clutch plates rusting and seizing together. Never operate the machine in this
condition
, as there will be no protection to the driveline and gearboxes against
shock loading. To free the clutch plates first slacken all pressure spring bolts and run
up the machine for a short period, deliberately try to cause the clutch to slip. Finally
re-tighten the tension spring bolts to their original length, taking great care not to
over-tighten. Alternatively refer to page 17.
If in any doubt, consult Spearhead’s Service Department or your local Spearhead
Dealer for further advice.
Fig. 7 Slip Clutch
