2007/08/27 The Traction Control System (If Equipped) is Updated {1408, 4801} Caterpillar


The Traction Control System (If Equipped) is Updated {1408, 4801}
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2007/08/27 [SEPD0903]
ELECTRICAL AND STARTING SYSTEM
WIRING GP
2007/08/27 The Traction Control System (If Equipped) is Updated {1408, 4801}
Off-Highway Truck/Tractor:
770 (S/N: BZZ1-UP)
772 (S/N: RLB1-UP)
773F (S/N: EED1-UP)
775F (S/N: DLS1-UP)
777F (S/N: JRP1-UP)

Description of Change: Formerly, the traction control system used a speed sensor with a copper washer in order to form a seal at the spindle. The copper washer did not completely seal the speed sensor on the spindle. The speed sensor was also too far from the spindle. Erratic signals could be produced by the speed sensor. Now, the traction control system uses a speed sensor with an O-ring seal in order to form a seal at the spindle. A chamfer was machined into the spindle in order to properly position the speed sensor.

Adaptable To: The 204-0761 Speed Sensor Gp has been updated. The speed sensor now uses a 3K-0360 O-Ring Seal in order to seal the spindle. Formerly, the speed sensor used the 239-7364 Ring in order to seal the spindle. The updated speed sensor is part of the 235-0119 Traction Control Wiring Gp, the 247-5667 Traction Control Wiring Gp and the 270-1509 Traction Control Wiring Gp. The updated speed sensor became effective in production with the machines BZZ83-UP, DLS401-UP, EED405-UP, JRP669-UP and RLB288-UP.

If you think that the speed sensor on earlier machines produces erratic signals, do the following.

Table 1
Parts Needed to Check the Traction Control System.    
Item     Qty     Part Number     Description    
1     2     3K-0360     O-Ring Seal    
2     1     155-0695     Thread Lock Compound    

  1. Locate the speed sensor.

  1. Inspect the speed sensor for the 239-7364 Ring or the 3K-0360 O-Ring Seal .

  1. If the 239-7364 Ring is on the spindle, remove the speed sensor from the spindle. Remove the ring.

  1. Before installation, apply 155-0695 Thread Lock Compound (2) to the threads on the speed sensor. Install the speed sensor. Torque the speed sensor to 30 ± 4 N·m (22 ± 3 lb ft).

  1. If the O-ring seal is on the speed sensor, remove the speed sensor from the spindle.



    Illustration 1g01411084



    Illustration 2g01411087

    View (A-A) and view (B-B)

  1. Inspect the spindle for the 15 degree chamfer (C) that should be around the opening. If the opening does not contain the chamfer, do not install the O-ring seal. If the spindle contains the chamfer around the opening, keep the O-ring seal on the speed sensor. Remove the O-ring seal from the speed sensor. Install one new 3K-0360 O-Ring Seal (1) on the speed sensor.

  1. Before installation, apply 155-0695 Thread Lock Compound (2) to the threads on the speed sensor. Install the speed sensor. Torque the speed sensor to 30 ± 4 N·m (22 ± 3 lb ft).

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