Graco Reactor A-20 Repair Parts

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

Graco Reactor A-20 Specifications

General

Brand	Graco
Model	Reactor A-20
Category	Paint Sprayer
Language	English