Johnston VM502, Руководство по обслуживанию

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V Range 502
l
652
l
802 Maintenance Manual
MA4:8
Chapter - Water System
Water Pump Repair
Water pumps by their very nature are subject to erosion and wear from the process of pumping water.
The life of the pump will depend on the quality of the water being used. The more particles that are in
suspension in the water the sooner the seals and valves in the pump will wear and require replacing and
are therefore considered as consumable items.
The main components in the pump that will require servicing are the suction and discharge valves and the
seals on the plunger pipes.
A pump working correctly will normally not have any water leaks. If the plunger seals wear water will leak
from the underside of the pump as shown below.
A drip ever 5 -10 seconds is an indication that the seals need replacing in the very near future.
A continuous drip from underneath the pump shows the seals are severely worn and require urgent and
prompt replacement. Shown by the arrows in the above picture.
If a steady stream of water leaking from the pump is observed the pump should NOT be used. Should the
pump be used in this condition water will be drawn back into the crankcase by the motion of the plungers.
This water ingress into the crankcase will cause a catastrophic failure of the pump.
When the suction and discharge valves wear the out put of the pump will be reduced and this will be
noticed as reduced output from the spray jets.
SUPAWASH
SUPAWASH PUMP
Pump Repair