Toyota Model 7HBW23 Service ManualSection 5. Troubleshooting

Symptom Tables: Lift/Lower System

Possible Cause Action

...check for bad control handle (ETAC) card

Unable to Pick Up a Load

With Master Control ON/OFF switch ON, the PIN-key code entered, the green ON (I) key on the keypad pressed, and the lower button depressed, check for lower signal input at CAN. (See “Service Display” on page5-21.) If no signal is detected, replace control handle card (A2). NOTE: Check for mechanical problems in the handle head before replacing control handle card.

Possible Cause Action

Load too large for lift truck capacityCheck load weight. Check lift pressure setting. Battery problemsReplace battery with fully-charged good battery.

Incorrect lift pressure adjustmentCheck and adjust lift pressure setting.

Contaminated or bad pressure relief valve

Check for contamination in hydraulic fluid. If contamination is present, flush, fill and bleed the hydraulic system. Clean the relief valve.

If no contamination is found, replace relief valve.

Bad lift pump or motorReplace lift pump or motor.

Slow Lower

Possible Cause Action

Bad lift/lower solenoid valve or wiringRepair or replace the solenoid valve or wiring.

Plugged or malfunctioning flow control valve

Check for contamination in hydraulic fluid. If contamination is present, flush, fill and bleed the hydraulic system and clean the relief valve.

If no contamination is found, replace the flow control valve.

Contamination in lowering solenoid valve

Inspect solenoid for contamination or binding.

Mechanical binding in lift mechanismAdjust or replace mechanism.

Bad or misadjusted lift-limit switchAdjust or replace lift-limit switch (pump should not hit relief if lift-limit switch is operating properly).

NOTE: If the pump hits relief and lower is attempted, lowering will be slow. Release the lower button momentarily, then continue to lower. Normal lower speed should resume.

00700-CL340-05, Issued: 2 May 20055-37