MASSEY FERGUSON 5400 - Page 456

Massey Ferguson 5400 - Issue 1.a
09A01.4
Description of circuit open centre 57 l/mn
Transmission components
The 17 bar circuit supplies, in parallel, the various
transmission functions via flanged solenoid valves on
the clutch / reverse shuttle unit, on the Dynashift
control and in the main channel of the right-hand cover.
None of these functions has priority and they may be
activated simultaneously.
Some of the solenoid valves (4WD, power take-off,
Dynashift and reverse shuttle (proportional solenoid
valves)) are linked to the electronic control system of
the tractor.
The functions supplied by the low flow rate circuit are
as follows:
- the hydrostatic steering;
- the Hare / Tortoise range shifting (Hi / Lo);
- the differential lock (front and rear);
- the 4WD clutch;
- the Speedshift;
- the clutch unit of the reverse shuttle;
- the power take-off system:
-clutch,
-brake,
- front PTO (depending on options).
Cooling and lubrication
When the various components of the transmission are
supplied, the left-hand cover directs oil towards the
radiator when it is hot, or directly towards to the
gearbox and PTO when it is cold.
The lubricating pressure is maintained by a valve (10)
calibrated to 1.5 bar and fitted on the front left-hand
side of the gearbox (Fig. 4).
Booster pressure for brake master cylin-
ders
REMINDER : Only unassisted master cylinders receive
booster pressure from the hose (1) connected
upstream to the 1.5 bar valve (10) (Fig. 4).
Fig. 4