6.2
Pinto BT-POM 1212 - Revision 5
Trouble Shooting
Diaphragm Pump Problems
PROBLEM
A Pump does not draw or deliver liquid.
Pressure gauge fl uc tu ates badly.
B Liquid fl ow is ir reg u lar
(Also check items un der A)
C Pump delivers in suf fi cient pressure
D Output drops & pump is noisy.
PROBABLE CAUSE
1 One or more valves are not seating prop er ly.
2 The pump is suck ing in air through suction line.
3 Air has not been entirely evacuated from the
pump.
4 Blocked suction fi lter.
5 Damaged or worn suction valves.
1 The air in the air chamber of the pump is
incorrectly set.
2 Diaphragm split.
3 Damaged or worn valves.
4 Foreign matter holding valves open.
1 Regulating valve:
• Sticking open
• Not set for pressure.
• Damaged or worn seat or spring.
2 Cylinder diaphragm ruptured.
3 Pump valves blocked, worn or damaged.
4 Spray nozzles worn, missing or exceed
pump capacity.
1 Oil level is too low.
REMEDY
1 Clean valve seat ing.
2 Examine the suc tion hose and ensure it is
fi rmly secured.
3 Rotate the pump with outlet hose and taps
open.
4 Clean suction fi l ter.
5 Replace suction valves.
1 Check pressure in air chamber of pump. Set
at 210-280Kpa (30-40 psi), or 10% of you average
spraying pressure.
2 Replace diaphragm.
3 Replace valves.
4 Clean valves.
1 Fix the regulator:
• Unstick the valves.
• Set the pressure.
• Replace the spring.
2 Replace diaphragms.
3 Unblock valves and or replace.
4 Replace spray nozzles with appropriate size.
1 Top up with oil to correct level (1/2 way up the
sump sight glass).
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