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Troubleshooting
Pump indications
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 weep hole
in body (7)
Product leakage visible at bottom of
body (7)
Air leakage at weep hole in body (7)
Product leakage visible at weep hole
and/or bottom of pump tube (26)
Product leakage at bottom of
cylinder (36)
Internal leaks
Pump does not prime or cycles
continuously, or slowly (once or twice/
hour)
Possible problems
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
Damaged seal (17)
Damaged air motor piston rod
Pump tube (26) not sufficiently tight to body (7)
Damaged gasket(s) (20)
Damaged seal (15)
Cylinder (36) not sufficiently tight to pump tube (26)
Damaged gasket(s) (27)
Lower valve seat (39) not sufficiently tight to
cylinder (36)
Damaged o-ring (38)
Foreign material between ball (33) and upper valve
seat (35)
Foreign material between ball (37) and lower valve
seat (38)
Worn or damaged ball (33)
Worn or damaged upper valve seat (35)
Worn or damaged ball (37)
Worn or damaged lower valve seat (39)
Worn or damaged seal (28)
Worn or damaged piston rod (30)
16
Solution
Inspect air motor and rebuild or replace as
necessary
Rebuild pump tube
Increase air pressure
Reduce air pressure
See Internal leaks
Replenish product
See Internal leaks
See External leaks
Correct leak
Separate pump tube from air motor and replace
seal (17)
Inspect piston rod and replace as necessary
Tighten pump tube (26) to body (7)
Separate pump tube from air motor and replace
gaskets (20)
Separate pump tube from air motor and replace
seal (15)
Tighten cylinder (36) to pump tube (26)
Disassemble pump tube and replace
gaskets (27)
Tighten lower valve seat (39) to cylinder (36)
Replace o-ring (38)
Locate and eliminate source of foreign material
Disassemble pump tube, clean, inspect and
replace worn or damaged components
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