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Troubleshooting
Problem
Air bubbles in fluid
Poor finish or irregular
spray pattern
Driver does not turn over
and LED is off
Driver does not turn over
and LED is on
Oil is leaking
* To determine if fluid hose or gun is obstructed, follow Pressure Relief Procedure, page 10. Disconnect fluid hose
and place a container at pump fluid outlet to catch any fluid. Turn pressure adjustment knob just enough
to start pump. If pump starts, the obstruction is in fluid hose or gun.
16
Cause
Loosen suction line.
Agitator/mixer is not submerged.
Agitator/mixer RPM is too high.
Incorrect fluid pressure at gun.
Fluid is too thin or too thick.
Dirty, worn, or damaged spray gun.
Over voltage (greater than 300 V)
No power to control board
Encoder fault
Oil was over-filled
Drain plug not tightened properly
Seal cartridge o-ring missing or
damaged.
Solution
Tighten suction line connections. Use
compatible liquid thread sealant or PTFE
tape on connections.
Submerge agitator/mixer.
Lower RPM.
See spray gun manual. Read fluid
manufacturer's recommendations.
Adjust fluid viscosity. Read fluid
manufacturer's recommendations.
Service spray gun. See spray gun manual.
Check power supply
Contact your Graco distributor or Tech
Service for more information.
Cycle power.
Recalibrate the encoder following the
procedure listed in the Electric Driver Manual
(333233).
Contact your Graco distributor or Tech
Service for more information.
Drain and refill as stated in Check Oil Level,
page 13.
Torque to 18-23 ft-lb (25-30 N•m).
Replace shaft bearing assembly.
333208F
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