Page Issue 01Chapter - Water System10:10
VT550 - Maintenance
P22/34-100 Johnston Water pump 283701-1
Seal and Valve Maintenance Instructions
The following shows the overhaul procedure for the valves and plunger seals
1. With a 22mm socket,
remove the three discharge
valve plugs (43) from the
top of the manifold.
2. With a pair of needle nose pliers remove the spring
tension cap (34), spring (35) and plate (36)
3. Use a valve extractor
tool (99.061) to remove the
valve seats (37)
4. Inspect the valve seat
(37) and valve seat (36) for
signs of wear or cavitation
and replace as necessary.
5. Using an 8mm Allen key
remove the inner hexagon
screws (45)
6. With a rubber mallet tap
the back of the valve casing
(29) and pull the valve
casing (29) off the plungers
(24a).
7. Using a 6mm Allen
key remove the two inner
hexagon screws (46).
8. Separate the intermediate
casing (48) from the valve
casing (29)
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