6.3
Pinto BT-POM 1212 - Revision 5
Section 6 Diaphragm Pump Problems
PROBLEM
E Oil being discharged through delivery
line or dis col oured oil in sight glass of
pump.
F Suction hose vibration.
G Pump valves hammering.
H No water fl ow on suction hose.
I Pressure gauge pointer swings vi o lent ly.
J Control valve leaking from spindle.
K Pressure gauge showing correct
working pres sure no pressure at
nozzle.
PROBABLE CAUSE
1 One or more diaphragms split or ruptured.
SUCTION SIDE OF PUMP
1 Air getting into suction.
1 Suction tap partly turned off.
2 Suction strainer(s) blocked.
1 Obstruction in tank or suction line.
DISCHARGE SIDE OF PUMP
1 Pressure control valve spindle doesn’t move
easily.
1 Split diaphragm or O-rings.
1 Burst discharge line.
2 Blocked pressure fi lter where fi tted.
3 O-ring(s) jamming fl ow in discharge line.
4 Ants, wasps build nests in discharge line or
nozzles.
REMEDY
1 Immediately drain oil from pump and fl ush to
remove all spray residues from sump. Remove
pump heads & fi t new diaphragms.
Fill to correct level with motor oil 20W/30.
1 Seal all joints securely with tape or sealant.
Firm up clamps.
1 Turn tap fully on.
2 Clean fi lters.
1 Clean foreign material from tank & suction line.
1 Lubricate with light oil or C.R.C.
1 Remove 4 body set screws, replace
diaphragm and O-rings.
1 Replace discharge line.
2 Clean pressure fi lter.
3 Clean discharge line of foreign materials.
4 Clean nozzles of foreign materials with tooth
brush
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