Fig. 27 - Disassembling the anti-shock valve.
AAnti-shock valve
BFitting
Fig. 28 - Oil discharging valve pushrod.
AFront case
BNonreturn valve pushrod
CRear case
DNonreturn valve
EBall
FShim
GNon return valve piston
Fig. 29 - Load sensing element.
ABolt
BCover
Inspection and checks
1 - Carefully clean all hydraulic distributor parts.
2 - Check that the valve spool, the various pistons located inter-
nally of the valve body and the relative seats are not scored or
unduly worn.
3 - Check that the main valve spool and the pistons of the various
circuit valves slide freely in their bores.
4 - Using a comparator, measure the projection Y of the push rod
B in relation to the valve body C; this dimension must be 18,5 mm
measured with the valve D seated. Check that the seats of valves
D and E are completely fluid tight; if there is any leakage due to
the presence of foreign matter, clean thoroughly or, if in doubt,
replace the valve.
Important: Test the check valve E for leakage by blasting with
compressed air.
5 - Verify that the calibration of the various springs is as indicated
on page 280.
Reassembling the lift
Proceed to refit the various parts removed, reversing the order of
the steps described above and observing the following directions.
Degrease the threads of plugs and fitting with a suitable solvent.
Replace all copper gaskets and O-rings.
Smear the threads of plugs with the specified sealant.
When securing the shock valve to the control valve housing,
torque to 78 ± 5 Nm (8 ± 0,5 kgm).
59
5
vehicle
rear hydraulic power-lift
276
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