Toyota Model 7HBW23 Service Manual
Section 5. Troubleshooting Symptom Tables: Lift/Lower System
Possible Cause
Action
...check for bad control handle (ETAC) card
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 page 5-21.) If no signal is detected, replace control handle card (A2). NOTE: Check for mechanical problems in the handle head before replacing control handle card.
Unable to Pick Up a Load Possible Cause
Action
Load too large for lift truck capacity
Check load weight. Check lift pressure setting.
Battery problems
Replace battery with fully-charged good battery.
Incorrect lift pressure adjustment
Check 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 motor
Replace lift pump or motor.
Slow Lower Possible Cause
Action
Bad lift/lower solenoid valve or wiring
Repair 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 mechanism
Adjust or replace mechanism.
Bad or misadjusted lift-limit switch
Adjust 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 2005
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