MASSEY FERGUSON 5400 - Page 586

Massey Ferguson 5400 - Issue 1.a
09I02.14
Assisted brake master cylinders
Pedals uncoupled (Fig. 10)
When force is applied to only one brake pedal, the oil
under pressure coming from the master cylinders to
the port (B) moves the spool (1) and presses the
ball (2) against the spool to block the connection (D)
and (A). Therefore, there is only one possible way for
oil to flow from (B) to (D).
Pedals coupled (Fig. 11)
When force is applied to both pedals simultaneously,
the spools (1) are thrust against each other and
compress spring (4). The plunger (3) then forces the
balls (2) apart lifting them from their seats in the spool.
In this way all the ports are directly connected, i.e.
there is a braking pressure supplied to tractor
brakes (D) and (E) and to the braking valve (A).
MA-09-05082A
A
DE
B
C
4
3
1
2
Fig. 10
MA-09-05083A
A
DE
B
C
3
2
1
4
Fig. 11