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Troubleshooting
Condition
Pump does not cycle.
Pump will not prime.
Pump cycles rapidly.
Pump cycles continuously, or slowly
(once or twice/hour).
External leaks
Product leakage visible at top of adapter (5).
Product leakage at sections of pump tube,
requiring removal of follower tube (35).
Internal leaks
Pump does not prime or cycles continuously,
or slowly (once or twice/hour).
Possible cause
Air motor not operating properly.
Pump tube jammed and/or contains
loose components.
Insufficient air pressure.
Excessive cycling speed.
Pump leaking internally.
Product source empty.
Pump leaking internally.
Pump leaking externally.
Distribution system leaking.
Initial tightening of adapter (5) to air motor
assembly (3) not sufficient.
Damaged o-ring (4).
Initial tightening of tube (18) to adapter (5)
not sufficient.
Initial tightening of tube (18) to retainer (20)
not sufficient.
Initial tightening of extension (24) to retainer (20)
not sufficient.
Initial tightening of extension (24) to
primer body (36) not sufficient.
Gasket(s) (6) worn or improperly crushed.
Gasket (23) worn or improperly crushed.
Foreign material between ball (15) and seat
in piston (17).
Foreign material between valve body (27) and
valve seat (28).
Worn or damaged component(s):
• Ball (15)
• Piston (17)
• Spring (14)
• Valve body (27)
• Valve seat (28)
• Seal (21)
• Seal (26)
• Rod (30)
13
Solution
Inspect air motor and rebuild or replace
as necessary.
Rebuild pump tube.
Increase air pressure.
Reduce air pressure.
→ Internal leaks.
Replenish product.
→ Internal leaks.
→ External leaks.
Correct leak.
Tighten adapter (5) into air motor
assembly (19).
Replace o-ring (4).
Tighten tube (18) into adapter (5).
Tighten tube (18) into retainer (20).
Tighten extension (24) into retainer (20).
Tighten extension (24) into primer body (36).
Replace gasket(s) (6).
Replace gasket (23).
Locate and eliminate source of
foreign material.
Disassemble pump tube, clean, inspect, and
replace worn or damaged components.
Table 6
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