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Troubleshooting
Pump indications
Pump does not cycle
Pump will not prime
Pump cycles rapidly
Pump will not stall (cycles more than
once or twice/hour)
External leaks
Product leakage visible at bottom of body (11)
Product leakage at exhaust port in
air motor assembly (1)
Product leakage between cylinder (19)
and valve body (22)
Internal leaks
Pump does not prime or cycles continuously,
or slowly (more than once or twice/hour)
Possible problems
1 Packings (8) too tight
2 Air motor not operating properly
3 Pump tube jammed and/or contains
loose components
4 Insufficient air pressure
1 Excessive cycling speed
2 Pump leaking internally
1 Product source empty
1 Pump requires break-in period
2 Pump leaking internally
3 Pump leaking externally
4 Distribution system leaking
1 Damaged gasket (18)
2 Cylinder (19) not sufficiently tight
1 Packing rings (8) too loose
2 Worn or damaged packing ring(s) (8)
3 Worn or damaged piston rod (5)
1 Worn or damaged gaskets (18)
2 Valve body (22) not sufficiently tight
1 Foreign material between ball (16)
and seat (17)
2 Foreign material between ball (21)
and valve body (22)
3 Worn or damaged ball (16)
4 Worn or damaged seat (17)
5 Worn or damaged ball (21)
6 Worn or damaged valve body (22)
7 Worn or damaged packing cups (13)
11
Solution
1 Adjust packing screw assembly (6)
2 Inspect air motor and rebuild or
replace as necessary
3 Rebuild pump tube
4 Increase air pressure
1 Reduce air pressure
2 See Internal leaks
1 Replenish product
1 Operate the pump against moderate fluid
pressure for up to one hour
2 See Internal leaks
3 See External leaks
4 Correct leak
1 Use kit 393426-1
2 Tighten cylinder (19) into body (11)
1 Adjust packing screw assembly (6)
2 Use kit 393426-1
3 Replace piston rod (5)
1 Use kit 393426-1
2 Tighten valve body (22) onto cylinder (19)
1 Locate and eliminate source of foreign material
2 Disassemble pump tube, clean, inspect, and
replace worn or damaged components
Table 6
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