MASSEY FERGUSON 5400 - Removing - Refitting the Control Unit

Massey Ferguson 5400 - Issue 1.a
09J01.10
GBA20 Power Shuttle control unit
F . Removing - Refitting the control
unit
If you work on the 17 bar hydraulic circuit
immediately after stopping the engine,
drop the pressure stored in the accumu-
lator or wait a while before working on the
circuit.
Removal
6. Mark and disconnect the connector on solenoid
valve EV2 of the Speedshift (Fig. 9) as well as
those of the proportional solenoid valves (12) (11)
of the power shuttle forward and reverse clutches
(Fig. 3).
7. Disconnect and remove pipes (2), (3), (4), (5), and
(7) (Fig. 12).
Note: To prevent oil flowing from the gearbox, it is
advised to disconnect the return pipes (2) and (3) at
their higher connections.
8. Unscrew the support (1) from the gearbox.
Remove the “support and unit” assembly by grad-
ually unscrewing the union (10) (Speedshift clutch
supply) (Fig. 12).
Refitting
9. Refit the “support and unit” assembly.
Tighten:
- the screws fixing the support to the gearbox to
50 - 70 Nm,
- the screws fixing the unit to the support to
25 - 35 Nm.
10. Reconnect the pipes and connectors.
Reminder
If it was necessary to replace the control unit or propor-
tional solenoid valves, test:
- the 17 bar pressure of the unit,
- the pressure of the Speedshift clutches;
- the pressure of the reverse shuttle forward and
reverse clutches.
Important: When pressurised, the reverse shuttle
clutches must be calibrated using Wintest.
Final operations
11. Carry out a road test of the hydraulic functions
affected by the repair work.
12. Check the oil tightness of the hydraulic unions.
Fig. 12