Massey Ferguson 5400 - Issue 1.b
09E01.16
Auxiliary spool valve
F . 3-position spool valve, SA / DA
with automatic return to neutral
Operation
Neutral position
The operating principle of the 3-position single or
double acting spool valve with automatic return to
neutral, is the same as for the previous 3-position SA /
DA spool valve with spring loaded return to neutral.
Inlet - outlet position (Fig. 13)
Operation is identical to the 3-position SA / DA spool
valve with spring loaded return to neutral, with auto-
matic return to neutral as an added feature.
A system placed in the unit (1) locks when the
spool (2) is activated.
The spool returns automatically when the pressure
reaches 150 - 170 bar.
The pressure passes through bores machined in the
spool. It then releases a system comprised of balls and
springs allowing the automatic return of the spool to
neutral.
The unit (1) is joined to channel (R).
N
OTE: A residual pressure in the unit (greater
than 2 bar) may cause undue return of the spool to
neutral.
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