Graco T-MAX 506, Operation - Repair - Parts

Page: 42 / 88

Troubleshooting
42 3A6748B
Electrical Short
Motor runs but pump does not
stroke
Pump pin damaged or missing. Replace pump pin if missing. Be
sure retainer spring is fully in groove
all around connecting rod.
Connecting rod assembly is
damage.
Replace connecting rod assembly.
Gears or drive housing. Inspect drive housing assembly and
gears for damage and replace if
necessary.
NOTICE
A short in any part of the motor power circuit will
cause the control circuit to inhibit sprayer
operation. Correctly diagnose and repair all shorts
before checking and replacing control board.
Problem Cause Solution
Building circuit breaker opens as
soon as sprayer switch is turned
on.
All electrical wiring for damaged
insulation, and all terminals for
loose fit or damage. Also wires
between pressure control and
motor.
Repair or replace any damaged
wiring or terminals. Securely
reconnect all wires.
Motor armature for shorts. Inspect
windings for burns
Replace motor.
Motor control board by performing
motor control board diagnostics. If
diagnostics indicate, substitute
with a good board.
Replace with a new motor control
board.
Building circuit breaker opens as
soon as sprayer is plugged into
outlet and sprayer is NOT turned
on.
Basic Electrical Problems on
page 41.
Perform necessary procedures.
For damaged or pinched wires in
pressure
control.
Replace damaged parts.
Sprayer quits after sprayer
operates for 5 to 10 minutes.
Basic Electrical Problems. Perform necessary procedures.
Electrical supply with volt meter.
Meter must read:
210-255 Vac for 220-240 Vac
models;
85-130 Vac for 100-120 Vac
models.
If voltage is too high, do not
operate sprayer until corrected.
Problem Cause Solution