Hog Technologies SK5500, Operation Manual

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Section 5 - Scheduled Maintenance
5.9 High Pressure Pump
Univalve Service
The Univalve cartridges will require service every
100 hours or if the following conditions are pres-
ent:
• 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 Univalves:
1. Make sure the water blasting 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 Univalve.
Use two flat 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.