2.26 ELECTRICS A break in the electrical circuit usually results in all the indicators on the display module flashing slowly except indicator (7) which will flash quickly. The audible alarm will also sound intermittently. A failure of the adhesive that bonds the sensor to the rear axle usually results in no readout or erratic readout from the display module. Procedure to test the operation of the sensor 1. Park machine on level ground. 2. Engage parking brake 3. Fully retracted boom. 4. Fully lower boom. 5. If fitted, remove work tool from coupler. 6. Ensure wheels are set to straight ahead. 7. Stop the engine. 8. Turn engine start switch to ON position.
The display module in the cab will perform a self- check. On completion of self-check only green indicator (7) should be illuminated. If indicators (8) to (17) are flashing slowly and indicator (7) is flashing quickly the sensor may be damaged or disconnected. (a) Check the two connections to the sensor. One of the connectors is located behind instrument panel (22). The other connection is located between the rear of the cab and the hydraulic control valve. This connects the harness for the sensor to the intermediate harness which is routed through the cab. (b) Test the operation of the sensor by substituting a spare sensor. If necessary replace the sensor.
Refer to “Procedure to install sensor”. If indicator (7) is flashing quickly and indicators (10) and (11) are illuminated, the output from the sensor may be negative. (The output of the sensor may be more than 100% of the load range). Refer to “Calibration procedure” and calibrate the system. If the display module does not comply with any of the previous steps in this procedure, the problem may not be with the sensor. Refer to “Testing and Adjustment - System Check” for further information.