Massey Ferguson 5400 - Issue 1.a
09J01.3
GBA20 Power Shuttle control unit
A . General
The unit (1) fixed to the right-hand side and front of the
gearbox (Fig. 1) carries out two hydraulic functions
quite separate to the input unit.
It controls:
- the Power Shuttle,
- Speedshift.
The channels and ducts machined in the unit allow oil
under pressure to be directed to the reverse shuttle
proportional solenoid valves and the Speedshift sole-
noid valve EV2.
All solenoid valves are controlled respectively by the
tractor electronic system.
A 60 micron filter element (8) (Fig. 1) is located under
the right-hand hydraulic cover, upstream of the control
unit. This additional filter supplies clean oil to the spool
of each solenoid valve.
Fig. 1
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