Johnston VT551 Maintenance Section page 58

18. Replace the three
spacer sleeves (26a) over
the plunger (24a) with the
f anged side toward the
valve casing (29)
21. Place the valve casing
(29) over the plungers
(24a). Secure with inner
hexagon screws (45) Torque
evenly to 45 NM
Chapter - Water System
10:12
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)
22. Install the high pressure
valve assemblies with o
rings (34 – 38) Ensuring
the f ngers of the spring
tensioning cap (34) DO
NOT obstruct the cross bore
in the head (29).
VT550 - Maintenance
20. Secure the intermediate
casing (48) to the valve
casing (29) with the inner
hexagon screws (46).
Torque to 12 NM.
23. Replace the high
pressure plugs (43) and
torque to 70 NM.
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