ENGLISH
SERVICE MANUAL
74
909 6424 000(3)2007-12 BR 601 / BR 651 / BR 751 / BR 751 C
DRIVE SYSTEM
TROUBLESHOOTING
OPEN CIRCUIT
The fuse (F2) causes an open in the circuit. This system allows to prevent the drive system motor and its circuits from being
damaged under overload conditions.
If there is an open in the circuit, the possible causes are:
There are bulky debris or cords under the machine or around the driving wheels (remove the debris).
The motor is damaged (check the motor electrical input).
The fl oor gradient is excessive (do not use the drive system on slopes with a gradient exceeding the specifi cations).
There is a short circuit in the drive system electronic board wiring harness (repair).
The drive system electronic board is faulty (replace).
The parking brake is faulty (see the Parking Brake chapter).
THE MACHINE DOES NOT MOVE
Possible causes:
The battery voltage is too low (charge the battery).
The forward/reverse gear pedal potentiometer is misadjusted or broken (adjust or replace).
The speed adjuster is broken (replace).
The drive system electronic board is faulty (replace).
The wiring harness is damaged (check all connections inside the electrical component compartment, included those of the
function electronic board).
The drive system motor carbon brushes are worn (replace).
The drive system motor is faulty (replace).
The microswitch of the safety system that prevents the machine movement if the operator is not seating on the driver's seat, is
broken (repair/replace).
The parking brake cannot be disengaged (see the Parking Brake chapter).
There is an open in the drive system electronic board fuse F2 (replace).
The function electronic board is faulty (see the Electrical System chapter).
DRIVE SYSTEM ELECTRONIC BOARD ERROR CODES
The warning LED (99) stays on, when the drive system operates properly and the machine is in the following condition:
Ignition key (12) turned to "I".
If the warning LED (99) is off or fl ashing, it indicates an error. Check the error code according to the following table.
1.
2.
3.
4.
5.
6.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
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