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TROUBLESHOOTING - PNEUMATIC SECTION
Symptom: Pump cannot be operated at low air pressure.
Cause:
Excessive friction of O-rings on spool valve
Remedy: Relubricate or replace the O-rings
Symptom: Pump can only be actuated at high air pressure.
Cause:
Air escapes through the piston guide in the top air cap.
Remedy: Replace O-ring on the piston extension.
Symptom: Pump runs slowly or not at all.
Cause:
Exhaust or spool valve is "icy."
Remedy: Stop pump for a short while and, if necessary, clear air line and supply of
moisture.
Symptom: Pump will not run and air escapes through the exhaust muffler.
Cause:
Pilot valve tappet is not sealing in top cap.
Remedy: Clean and grease tappet, check for wear and replace if necessary.
Symptom: Pump will not run and air escapes through small holes in the spool valve
housing.
Cause:
Spool valve fails.
Remedy: Clean spool valve and sleeve, check O-rings and sleeve, lubricate and/or
replace.
Symptom: Pump will not run and escapes through the small holes in the bottom cap.
Cause:
Pilot valve tappet is not sealing in the bottom cap.
Remedy: Clean and grease tappet, check for wear and replace if necessary.
Symptom: Pump operates at a high frequency and short strokes.
Cause:
Pilot valve defective.
Remedy: Clean, check and lubricate pilot valve parts or replace if necessary.
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