Massey Ferguson 5400 - Issue 1.b
09E01.15
Auxiliary spool valve
Neutral position (Fig. 12)
Oil is not available from outlets (A) or (B). Oil is directed
via the continuity channel (N) to the lift control valve
and passes directly to the suction manifold of the
pump when the linkage is in neutral position.
Channels (N) and (P) are linked in the intermediate
block (7) (Fig. 7) to supply the subsequent spool
valves.
Inlet - outlet position (Fig. 12)
When the spool (2) is moved upwards or downwards,
the continuity channel is cut, the pressure increases
and raises the valve (1).
The oil is then directed to the internal channels via
grooves located on the spool. Depending on the spool
position, outlets (A) or (B) are supplied.
Simultaneously, the oil returning from the ram is
directed depending on the position of the spool, to
outlets (A) or (B) to reach the return channel (R).
Single / double acting change-over
(Fig. 12)
To obtain the single acting position, unscrew the
valve (4). The outlet (A) then opens into the
channel (R), and the outlet (B) supplies the hydraulic
slave device.
To obtain the double acting position, screw in the
valve (4).
Fig. 12
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