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17 bar - 5 bar and 1.5 bar valves - Open centre
Operation
(Fig.
4)
A back pressure is generated in the low pressure
circuit, forcing the ball (6) from its seating and thereby
compressing the spring (5). The oil passes into the rear
of the spool (7), creating a pressure which progressi-
vely moves it downwards by compressing the spring
(9) which thrusts against the shims (8).
When one of the low pressure functions is activated,
the momentary drop in pressure returns the ball (6) to
its seating through the action of the spring (5). The oil
contained in the chamber at the front of the plug (4)
flows through a drain port located at the end of the
spool (7).
Leaks return to the housing via port R in the cover
(Fig.
5).
Identification of components and ports
(Fig.
5)
(1)
17 bar low pressure switch
(2)
Plug (provision for outlet).
O
Valve supply via the steering spool valve return
P
Outlet to low pressure parts of the right-hand
hydraulic cover
R
Return port
Legend
17 bar low pressure
09H01.6
P
O
R
R
MA-09-06065A
Massey Ferguson 5400 - Issue 1.a
Fig. 4
1
2
Fig. 5
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