CONFIDENTIAL TIBU4197-00

Some of the M312, M315, M318, and M320 Wheeled Excavators may experience a failure in the brake pedal switch. The switch that is located under the brake pedal is responsible for two functions; the stop lamp cut off and the oscillating axle lock.

Replace the 174-8209 switch.

2. Procedure for removing the old 176-6809 Bracket and the old
   174-8209 Switch.

1. Remove the existing bracket with switch.

Note: Please loosen only the fastening nut on the left
bolt; otherwise the adjustment for the locked position on the pedal will no longer be correct.

2. Remove the boot on the switch and disconnect the switch.
3. Disconnect the following wires from the existing connector housing; PU(19), PK(13), BR(10)+BR(11) and BU(20), and remove the boot from the harness.
4. Reroute the existing harness segment under the cab platform.
5. Connect the wires with the attached 5W-4957 Connector.
6. If the locking latch of a terminal has been broken off, crimp the attached 5W-1987 Terminal to the wires. See
   Illustration 1.

Illustration 1. Pin Assignment

1. Procedure for mounting the new 237-9615 Bracket and the 247-6935 Switch.

1. Mount the new switch to the new bracket. The reference dimension between bracket and upper surface of the switch bushing is 26 mm +/- 1 mm. See Illustration 2.
2. Fix the bracket under the brake pedal with the existing bolts and nut.
3. Adjustment the position of the switch. If the brake pedal is locked, the upper surface of the switch bushing may not have any contact with the lower surface of the brake pedal.
   
   The distance between the lower surface of the brake pedal and the upper surface of the switch bushing has to be adjusted into the range of 2 mm to 3 mm. See Illustration 2.
   
   After adjusting the switch use Loctite No. 243 to secure the upper mounting nut of the switch.



Illustration 2. Brake Pedal

4. Route the cables of the switch through the grommet between the travel pedal and the brake pedal. Connect the 4 wires to the 5W-2005 Connector. See Illustration 3.



Illustration 3. Pin Assignment

5. Mate the two connectors and use strap cables in order to secure the connectors to the existing harness. See Illustration 4.

Illustration 4. Strap Cables

1. After installation is complete, check the following functions of the parking brake.