All Copyright and rights are the property of Johnston Sweepers Ltd
V Range 501
l
651
l
801 Maintenance Manual
MA4:4
Chapter - Water System
M02MA-030
A
C
B
M02MA-018
A
C
F
B
D
E
M02MA-013
A
C
B
This valve is factory set and should not normally
be touched, but should it be necessary to make
adjustments, the pressure is set as follows.
Pressure Setting
Remove the cover (
A
) and loosen adjuster
locknut (
B
). Connect a pressure gauge to the
test point located in the systems locker. With
the auxiliary engine running at low idle speed
(750/800), and all water sprays switched off,
turn adjuster screw (
C
) until gauge reads
3.5 bar (50 psi). Tighten locknut and replace
cover.
Solenoid valves control the water spray jets and are
located in the systems locker.
The valve is easily dismantled for inspection or
cleaning by unscrewing the retaining cap (
A
) through
the coil (
B
).
To access the armature, unscrew the four retaining
screws (
C
) and remove the armature cover (
D
). The
armature (
E
) can be removed. When refitting parts
ensure the ‘O’ ring (
F
) is in good condition and located
correctly.
Periodically the hydrant filter (
A
) should be cleaned,
or replaced if damaged. To gain access to the filter,
unscrew the hydrant coupling (
B
) and withdraw the
filter from its housing (
C
).
Solenoid Valves
Relief Valve
Hydrant Filter
Page Issue A
