MASSEY FERGUSON 5400 - Page 310

Massey Ferguson 5400 - Issue 1.a
06E01.10
GPA20 differential
Hydraulic test
If servicing has been carried out on piston (5), seals (3)
(8), or flange (9), it is necessary to check the tightness
of the assembly.
20. Fit a pressure gauge that has been previously
tested for air tightness to the supply union (39)
(Fig. 9).
21. Supply the circuit with compressed air at approxi-
mately 5 bar so as to correctly place the piston and
O'rings in the left-hand flange (9).
Redue the pressure to 0.3 bar and carry out the
tightness test.
22. Close the valve. For approximately 1 minute, no
drop in pressure must be observed on the pres-
sure gauge.
23. Disconnect the pressure gauge and reconnect the
supply pipe (2) (Fig. 3).
If removed, reconnect the 4-speed LSPTO control
(Fig. 3) and set the control (see section 7).
24. Refit the brake piston and left-hand trumpet
housing (see section 6).
25. Start the engine.
Check the oil tightness of the supply pipe (2)
(Fig. 3) and the correct operation of the differential
lock.
Fig. 9