Inspecting the clutch
Check the friction surfaces of the clutch discs for signs of wear or distress, and replace if necessary.
The actuator piston must be replaced if scoring is evident.
The hub must be replaced if any depressions are discernible along the tips of the splines enabling the sliding movement
of the clutch discs.
Test the operational efficiency of the piston return spring, which must perform to the specifications given in the table;
replace if necessary.
Check that the control valve spool is not scored.
The seals of the clutch actuator piston and the brake apply piston must be replaced if significantly worn, likewise the
brake disc.
Whenever the unit is reassembled, make certain that the oil ducts of the clutch housing are cleaned thoroughly, using
compressed air if need be.
Checking the clearance between discs
When new discs are installed, check that the clearance A (fig 13) is between 0.5 and 2 mm.
If the clearance is greater that the maximum permissible value, add one shim p/n 2.1599.499.0 at the position arrowed.
Caution: it is recommended that the operating pressure of the P.T.O. clutch circuit be tested only when the unit is
being fully overhauled. The test is made by connecting a pressure gauge directly to the clutch assembly in place of
the damper.
Fig. 13 - Checking the disc clearance.
A - If clearance is greater than prescribed, add 1 x shim 2.1599.499.0.
transmission
power take-off
36
3
174
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