Massey Ferguson 5400 - Issue 1.b
09D01.3
Trailer braking - Open centre
A . General
5400 series tractors equipped with an open centre
hydraulic circuit can be fitted with a trailer braking
mechanism comprised of:
- a valve unit (6) (Fig. 1) (spool valve) fitted on the
right-hand side hydraulic cover,
- a pipe linking the spool valve to a connector (1)
(Fig. 1) located at the rear of the tractor,
- a pilot flow pipe connected to the master cylinders.
The valve receives its priority supply from the high
pressure circuit. The oil not used for braking the trailer
is directed to the spool valves (auxiliary and lift control
spool valves).
The valve regulates the flow rate and pressure to the
trailer brakes. It is controlled by the tractor braking
circuit pressure, generated by the master cylinders, so
as to obtain progressive tractor / trailer braking that is
proportional to the force applied to the pedal. The
trailer brake only operates if the two brake pedals are
latched.
Identification of pipes, hoses and ports
(Fig. 1)
Legend
B : Supply to the trailer brake connector
N : Continuity to spool valves (auxiliary and lift control
spool valves)
P : Pressure
R : Return to housing
Y Pilot flow from tractor braking unit (master cylin-
ders)
Fig. 1
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