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Scheduled Maintenance
12. Inspect the sealing surfaces on both pieces
very carefully to determine whether to stop or
to complete another cycle. The shiny places
are evidence of damage and/or wear. Consult
the legend to determine the cause and indica-
tions of typical wear patterns
13. If additional cycles are required, apply 1/8
teaspoon of 150 grit lapping compound to the
suction valve, then repeat steps 3-12 until the
shiny spots are no longer visible and the sur-
face is perfectly smooth with a consistent color.
14. Alternate grit sizes every 3 or 4 cycles until
lapping is complete. The nal cycle should
always be completed with 600 grit compound.
15. Follow the same procedure for the discharge
valve on the other side of the UNI-VALVE car-
tridge.
16. Reassemble the UNI-VALVE with new O-rings
and seals.
17. Lubricate the O-rings and seals with the grease
provided in Mobile Spare Parts System box
# 2.
18. Reinstall the UNI-VALVE cartridges into the
manifold.
NOTICE:
NEVER USE DRY COMPOUND WHEN LAPPING UNI-VALVES.
KEEP 3 FULLY LAPPED UNI-VALVES ON HAND TO AVOID
DOWNTIME. NEVER USE UNAPPROVED MACHINERY SUCH
AS DRILLS TO SPEED UP THE LAPPING PROCESS.
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