Johnston VM502, Maintenance Manual

Page: 127 / 220

MA4:11
V Range 502
l
652
l
802 Maintenance Manual
Johnston Sweepers Limited
Chapter - Water System
18. Replace the three
spacer sleeves (26a) over
the plunger (24a) with the
flanged side toward the
valve casing (29)
19. Install the pressure
rings (30) over the plungers
(24a). Make sure that the
small o ring (49) is in place
in the intermediate casing
(49)
20. Secure the intermediate
casing (48) to the valve
casing (29) with the inner
hexagon screws (46).
Torque to 12 NM.
21. Place the valve casing
(29) over the plungers
(24a). Secure with inner
hexagon screws (45) Torque
evenly to 45 NM
22. Install the high pressure
valve assemblies with o
rings (34 – 38) Ensuring
the fingers of the spring
tensioning cap (34) DO
NOT obstruct the cross bore
in the head (29).
23. Replace the high
pressure plugs (43) and
torque to 70 NM.