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TROUBLESHOOTING
Symptom
Fluid discharged from exhaust outlet
Air bubbles in fluid discharge.
Motor blows air out main exhaust when stalled
on either stroke.
Low fluid output volume.
Possible Cause
Ruptured Diaphragm (10)
Diaphragm Nut loose (11)
Leak in suction side plumbing
Leak at Inlet Manifold / Fluid Cap connection
Leak at Diaphragm Nut (11)
U-cups inserted incorrectly, damaged, or
missing.
Ceramic valves damaged or contaminated with
debris (4).
Pilot valve not correctly oriented.
Low or blocked incoming air supply.
Outlet plumbing blockage.
Pump not primed.
Suction pipe too small or suction hose not rigid
(kinks or collapses).
Leak in inlet suction plumbing.
Pump blocked internally with debris
*Add a medium grade thread locking compound to the diaphragm rod threads.
10
Repair
Replace Diaphragm (10)
Tighten loose Diaphragm Nut (11)*
Check connections of suction plumbing.
Check torque of Inlet manifold bolts (21)
Check torque of Diaphragm Nut (11)
Check (2B & 2D) U-cups on major valve spool.
Check (4) ceramic valves for debris or damage.
Be certain to load the pilot valve in the proper
orientation per diagram found within the center-
body.
Check air supply.
Check for any obstruction in the outlet plumbing.
The pump must be mounted vertically for checks
to properly work.
Check for pump cavitation - the suction pipe
should be sized at least as large as the inlet
thread diameter. The suction hose must be rigid
or non-collapsible.
Check all inlet plumbing for possible suction
leaks.
Inspect the pump for debris that could block
internal flow or foul checks.
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