Pressurepac Series Miniaturized Air Driven Hydraulic Power Units • OM-7S
5
Maintenance
Air Drive Section
Air drive and air valve sections are pre-lubricated at time of assembly at the factory with Haskel 50866
Lubricant and require no other means of lubrication. To lubricate the spool or air piston, or to inspect and
repair or replace any parts, disassemble and assemble parts in the sequence shown on assembly
drawings. Note the small air inlet screen. Inspect periodically. See assembly drawing for appropriate
torques on fittings on tie rods.
NOTE: The most common cause of air drive malfunction will be o-ring 568011 on the end of spool 17517.
Inspect here first, replace if necessary and retest before further disassembly of air drive.
Hydraulic Section
To inspect, clean and/or replace any parts, disassemble and assemble the pump parts as shown on
individual assembly drawing. Note small screen on pump fluid inlet port. Inspect periodically.
Troubleshooting Guide
Symptom Cause Remedy
Inadequate air supply.
See “Air System” under
“Installation”.
Pump will not cycle.
Contaminated air system.
Inspect and clean all air system
parts. Relubricate spool and air
piston with Haskel Silicone Lube
p/n 50866. Recheck suitability of
air line filter.
False or double cycling.
Leakage of pump air drive pilot
system.
Install new air section seal kit in
pump.
Check valve(s) malfunction.
Clean, inspect and replace
check valve(s) if necessary.
Release valve malfunction.
Clean and inspect ball, seat and
internal oil pilot passage.
Relief valve malfunction.
Increase setting. Inspect ball
and seat for damage.
Pump cycles without pumping or
does not dead-head.
Tank fluid low.
Add fluid per fill procedure.
