2003/03/24 Correction to Disassembly and Assembly , "Transmission - Assemble" {1408, 3030, 3030} Caterpillar

Track-Type Tractors:

D10R (S/N: AKT1-UP)

Service Magazine SEPD0676, 24 March 2003, "An Improved Method for Adjusting the Speed Sensor is Now Available". Disregard this article. See the article that follows.Disassembly and Assembly, RENR3927, "D10R Track-Type Tractor Power Train", "Transmission - Assemble". This module is part of Service Manual, RENR3920. Replace Step 92 in the module above with the following adjustment procedure.

The present method for adjusting the gap of the speed sensors may result in erratic signals. In some cases, the speed sensors may become damaged by contacting the rotor. In some cases, the gap between the rotor and the speed sensors may be incorrect.

An improved method for adjusting the speed sensors on the D10R transmission has been developed. This new method will result in speed sensor signals that are more consistent across a wide range of speeds and loads on the transmission.

If intermittent faults from the speed sensor occur, adjust the position of the speed sensor by using the following procedure. Step 92 in the module that is referenced above should be replaced by the following steps.

Adjusting the Speed Sensor

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Illustration 1	g00986065
(1) Speed sensor (2) Speed sensor (3) Jam nuts (4) Bolt (5) Bracket

1. Install speed sensor (1) and speed sensor (2). Do not tighten jam nuts (3) at this time.

2. Turn the rotor so that a tooth lines up with the center of each speed sensor.

3. Install a 1/2 - 13B bolt (4) in bracket (5) .

   Note: Make sure that the bolt is at least 38.1 mm (1.5 inch) in length.

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Illustration 2	g00986066

4. Tighten bolt (4) against the rotor to a torque of 4.5 N·m (40 lb in).

   Note: Do not overtighten bolt (3). Damage to the rotor may occur if you overtighten the bolt.

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Illustration 3	g00986067
(3) Jam nuts (4) Bolt (5) Bracket (6) Feeler gauge

5. Use a 1.37 mm (0.054 inch) feeler gauge (6) in order to set the gap between the rotor and the speed sensor.

6. Hold the body of each sensor while you tighten each jam nut (3) to a torque of 25 N·m (18.5 lb ft).

7. Remove bolt (4) from bracket (5) .

   Note: On some of the early machines, it may be necessary to modify the 165-5631 Bracket. Use Illustration 4 in order to add a 1/2 - 13B threaded hole to the bracket.

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Illustration 4	g00986068
(7) 1/2 - 13B threaded hole (A) 60.8 mm (2.394 inch) (B) 60.8 mm (2.394 inch)

8. Drill a 11 mm (0.433 inch) hole (6) in the bracket for the sensors.

9. Tap the hole for a 1/2 13 2B threaded hole.