Komatsu FB25SHS-4 Serial Number 030810A - Maintenance & Troubleshooting discussion in Forkliftaction's forums

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Komatsu FB25SHS-4 Serial Number 030810A

When turning on the unit code 4 comes on the dash and the wrench light comes on. Once the hydraulics are activated the wrench light goes out and the lift runs fine. Can anyone tell me what this code is for and what needs to be done. Thanks.

Posted 11 Dec 2010 00:45
By garland_m
joined 16 Oct'09 - 205 messages
Virginia, United States

Work Hard and Fish Long

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FIRST BLOCK THE TRUCK SO THE DRIVE WHEELS ARE OFF THE GROUND!

code 04 description
Start switch input low after initial start up.

Symptom
fwd or rev contactor will not pick-up

Possible cause
fwd or rev directional switch closed on initial start up
Depress accel and see if code 03 or 02 comes up after start up if 03 then the rev switch is closed if 02 comes up the fwd switch is closed.
Possible cause 2
Excessive leakage from TB2 to battery negative
Check voltage at TB2 with key and seat switches closed and directional lever in neutral. voltage should be greater than 60% of battery voltage.

If less than 60% voltage. remove wire from TB2 and measure ohms from wire to terminal N on traction panel. Value should be greater than 22k ohms.

you may have a glitchy switch. this is normally an out of sequence code on start up.

Posted 11 Dec 2010 08:52
By bruce_c
joined 28 Jul'10 - 52 messages
Missouri, United States

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