Haulotte HA20 LE and HA20 LE PRO (HA61 LE): electric boom lift
Haulotte error code F04.34 — Front Axle Unlocking
Message on the display: Front Axle Unlocking
Code F04.34 occurs in machines: Haulotte HA20LE, HA61LE, HA20LE PRO, HA61LE PRO.
blocking fault
[case 1] b0 Digital output's failure : Oscillating axle unlocking with oscillating axle option --> YV101 YV101 : [case 2] b1 Detection of incoherence between the state of control for oscillating axle and pressure in the oscillating axle control valve when drive control is above the third of maximum control --> YV101 = ON YV101 : [case 4] b2 Detection of incoherence between the state of control for oscillating axle and pressure in the oscillating axle control valve : Control is OFF and detection of pressure --> YV101 = OFF YV101 :
Description from the Haulotte service manual, in the original wording.
Possible causes
- Check connection to ground
- Check connection to U106 ECU digital output
- check connection to electrical collector
- check connection between electrical collector and electrovalves
- Check connection to U100 ECU digital output
- check connection between electrical collector and electrovalves SP109 :
- Check connection to U100 ECU digital input
- check connection between electrical collector and electrovalves Check also minimum speed for both directions (when reaching the third of the joystick’s stroke on front direction, drive must be effective “wheels are turning to front direction” / when reaching the third of the joystick’s stroke on reverse direction, drive must be effective “wheels are turning to reverse direction”).
What you can do
Switch the machine off with the emergency stop and switch it on again. If the code comes back, do not use the machine and call service.
Solution from the manual
Check connection to ground Check connection to U106 ECU digital output check connection to electrical collector check connection between electrical collector and electrovalves Check connection to ground Check connection to U100 ECU digital output check connection to electrical collector check connection between electrical collector and electrovalves SP109 : Check connection to ground Check connection to U100 ECU digital input check connection to electrical collector check connection between electrical collector and electrovalves Check also minimum speed for both directions (when reaching the third of the joystick’s stroke on front direction, drive must be effective “wheels are turning to front direction” / when reaching the third of the joystick’s stroke on reverse direction, drive must be effective “wheels are turning to reverse direction”). Check connection to ground Check connection to U100 ECU digital output check connection to electrical collector check connection between electrical collector and electrovalves SP109 : Check connection to ground Check connection to U100 ECU digital input check connection to electrical collector check connection between electrical collector and electrovalves
Source: Haulotte Maintenance Book HA20 LE (4001028020), fault codes chapter.
The descriptions are quoted from the manufacturer's service documentation and are for guidance only. Clearing codes, calibrations and repairs are carried out by a qualified service technician according to the manual for the specific serial number. A machine with an active blocking code must not be used until the cause has been removed.
Does code F04.34 not go away?
RK Rental services Haulotte lifts at our workshop or on site at the customer's premises (construction site, factory, warehouse). We read the code, remove the cause and select the parts by serial number.
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