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PROBLEM
One pressure gauge drops when
pumps are stalled on the upstroke,
but not the downstroke
A side rich; lack of B side
B side rich; lack of A side
Fluid pressures not balanced
between A and B side
Pump does not reverse direction
Unequal fluid pressure between
UP/DOWN stroke
Pumps stop moving, Pump Mode
Function green knob light off
311512A
CAUSE
Piston check ball not sealing
Piston packing not sealing
Loose piston stud in pump
Bad inside sleeve seal
A side gauge is low
B side gauge is low
A side gauge is low
B side gauge is low
Fluid viscosities not equal
Inlet Y-strainer screen plugged on low
pressure side
Gun port or filter plugged on high
pressure side
Pump inlet ball not seating or sticking Clean seating; see pump manual
Drum fluid outlet supply hose too
small
Low side feed pump not working
Obstruction of air motor or pumps
Reversing switch failed
Air solenoid valve failed.
Air regulator pressures not set cor-
rectly. Feed pumps boost pressure on
up stroke.
Over-pressure shutdown from imbal-
anced pressures. Plugging one side
will double the pressure. Starving
one side will double the pressure on
the other side.
Troubleshooting
SOLUTION
Repair pump; see 309577
Repair pump; see 309577
Repair pump; see 309577
Repair o-ring; see 309577
B side restriction downstream of
gauge. Check gun check valve
screen, mix module, or mix manifold
restrictor.
B side material supply problem.
Check B side inlet strainer and pump
intake valve.
A side material supply problem.
Check A side inlet strainer and pump
intake valve.
A side restriction downstream of
gauge. Check gun check valve
screen, mix module, or mix manifold
restrictor.
Sometimes normal if pressure offset
is below 200 psi (14 bar)
Preheat material in drums by recircu-
lating; see Operation manual 311511
Clean inlet filter screen
Clean or replace; see gun manual
Use 3/4 in. (1.9 cm) ID hose with
short length
Turn on or repair feed pump
Check and clear obstruction
Check and service switch assembly;
see page 16.
Check solenoid valve, see page 16.
Adjust UP/DOWN air regulators to
create equal fluid outlet pressures;
see Operation manual 311511.
Check for gun restriction, see Gun
manual
Air pressure set too high; lower air
pressure
Pump cavitating on low pressure
side; check inlet and clean strainer.
Check feed pump.
Heater plugged on low pressure side;
see Repair, page 18.
9
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