Johnston VM502, Maintenance Manual

Page: 126 / 220

V Range 502
l
652
l
802 Maintenance Manual
MA4:10
Chapter - Water System
9. Remove and inspect the
low pressure seal (50) and
replace if necessary.
10. Turn over intermediate
casting (48) Remove
and inspect the high
pressure seal (31) and the
support ring (32) replace if
necessary.
11. Remove the seal case
(39) from the valve casing
(29) and inspect both O
Rings (40) for wear.
12. Using needle nose
pliers, remove the spring
tensioning caps (34), valve
spring (35), valve plate (36)
from the valve casing (29)
Using a valve extractor
(99.061) to remove the
valve seat (37) from the
valve casing (29).
13. Inspect the valve seat
(37) and valve seat (36) for
signs of wear or cavitation
and replace as necessary.
14. Install the inlet valve
assembly (34 – 38) back
into the valve casing.
Ensure the “fingers” of the
spring tensioning cap (34)
DO NOT obstruct the cross
bore in the valve casing
(29).
15. Install the seal case (39)
with O Rings (40) into the
valve casing (29)
16. Install the support ring
(32) and the high pressure
seal (31) into the intermedi-
ate plate (48)
17. Lubricate the low
pressure seal (50) and
install into the intermediate
casing (48).