AIRLESSCO 25M232, Operation - Repair - Parts, Page: 54 / 72

Troubleshooting - Drive System
54 3A4637A Operation, Repair, Parts
Fluid Pump Runs Constantly
1. Perform Pressure Relief Procedure , page 8, turn
prime valve forward to SPRAY position, and turn
power switch OFF.
2. Remove control box cover.
ti29061a
Troubleshooting Procedure:
With a pressure gauge plumbed into
the paint hose, start the engine. Turn
pump switch ON. Does sprayer
exceed maximum pressure?
NO
Pump problem. See the proper fluid
pump manual for the sprayer for
further troubleshooting procedures.
YES
Disconnect clutch wires from control
board (see diagram, pages 17, 48).
Does the pump stop running?
Mechanical problem in the clutch
pinion assembly (clutch may be
close to the rotor).
NO
Make sure clutch wires are plugged in
(see diagram, pages 17, 48). Do the
clutch test points read 10-18 DC volts?
Check for a short from the two
clutch wires to the frame. If shorted,
repair or replace faulty wire.
NO
Unplug transducer from control board. Replace the control board.
NO
YES
YES
YES
Bad transducer.
Replace and test with a new one.