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Scheduled Maintenance
5.6 High Pressure Pump
UNI-VALVE Service
The UNI-VALVE cartridges will require service
every 100 hours or if the following conditions are
present:
• Water leakage appears at weep holes in the
top of the manifold.
• Pump discharge is pulsating or erratic with
charge water pressure in the normal operat-
ing range.
• The valves are suspected as the cause of other
poor pump performance symptoms.
NOTICE:
ALWAYS CHECK FOR WATER DRIPPING FROM THE UHP
PUMP WEEP HOLES DURING HIGH PRESSURE TEST. WATER
DRIPPING FROM THE SQUARE HOLES INDICATES THE FACE
SEALS ARE LEAKING. WATER LEAKING FROM THE ROUND
HOLES INDICATES THE HIGH PRESSURE VALVE SEALS
ARE LEAKING.
Removing UNI-VALVES:
1. Make sure the waterblasting system is shut-
down with the truck in the service position.
2. Remove the valves using a 2 lb hammer and
7/8” Allen wrench (Jetstream tool) to loosen
the 8 head bolts in an “X” pattern. Finish re-
moving by hand or with an impact wrench.
3. Rotate the hinged UHP pump manifold until it
is resting on the support.
4. There is a groove machined into each
UNI-VALVE. Use two at screwdrivers placed at
opposite sides of the valve to extract each one.
5. Cover the manifold with a clean rag to protect
the sockets from dirt and other contamination.
Installing UNI-VALVES:
1. Clean the valve sockets to make sure no dirt
and debris enters the UHP pump.
2. Lubricate the sockets and UNI-VALVE cartridges
with the grease provided in the Mobile Spare
Parts System.
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