Troubleshooting The Proportional system

If no functions work or if all functions are slow when controlled by the pendant, but work correctly when the manual operation button is pressed on the proportional valve then the problem is with the proportional electronic control system.

Proportional Valve Parameters

Cracking voltage                2.6V

Full open voltage               7.75V

Coil Resistance                   3.66W

Check Voltage at Value

Have the engine running to generate sufficient voltage (13-14 V). As the trigger is pulled the valve voltage should start near zero, jump to the valve cracking voltage after slight trigger travel, increase steadily as the trigger is pulled, reaching the full open voltage.

If the voltages are correct, check the resistance across the coil.  If the resistance differs significantly from the nominal resistance replace the coil.

THE FOLLOWING APPLIES TO NON-FM CONTROL SYSTEMS ONLY.  FOR FM SYSTEMS, REFER TO THE FM TROUBLESHOOTING SECTION OR CONTACT LIFTMOORE, INC FOR MORE INFORMATION.    

VALVE DRIVER BOARD CALIBRATION

Refer to Relay Board Drawing.

Remove the relay board from the Deutsch box.

WARNING!

DO NOT allow board to contact any metal object.

Slightly pull the trigger (to obtain minimum voltage), hold, and use a screwdriver to turn R1 CCW to decrease- CW to increase. Next, fully pull the trigger (to obtain maximum voltage), hold, and turn R2 CCW to decrease- CW to increase. The voltage of R1 might change as R2 is changing or vice versa. Recheck the Min and the Max voltages. If voltage is correct, reassemble the board; otherwise, repeat.

If problem persists contact Liftmoore, Inc. for further instructions.