Installation Of Differential Steering Control Update On The D6T, D7E, And D8T Track-Type Tractors{5063, 5705} Caterpillar

Track-Type Tractor:

D6T (S/N: KSB1-296; ZJB1-262; DTD1-186; SLJ1-161; GMK1-294; RCW1-248)

D7E (S/N: MDB1-194; SCG1-130)

D8T (S/N: MLN1-281; FCT1-269)

Introduction

The following Special Instruction contains directions on upgrading the differential steering controls on the D6T, D7E, and D8T Track-Type Tractors. In order to do this rework the following parts kits will be required:

• 368-6470 for reworking a D7E or D8T

• 368-6471 for reworking a D6T

Reference Section

ReferenceDisassembly and Assembly, KENR5612, "Joystick Speed & Direction Control" for the disassembly procedure for the D7E.

ReferenceDisassembly and Assembly, KENR8934, "Steering Sensor - Remove and Install" for the disassembly procedure for the D8T.

ReferenceDisassembly and Assembly, KENR8915, "Joystick Control (Steering and Transmission)" for the disassembly procedure for the D6T.

Required Parts

Rework Procedure

1. Disassemble the left-hand control group. Save hardware for reuse on the D6T.
   • Remove tiller

   • Remove left-hand control group covers

   • Remove clock spring assembly

   • Disconnect tiller handle and clock spring harnesses

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Illustration 1	g02381723

2. Install plate (3) using screws (1). Refer to Illustration 1 for the correct orientation of plate (3) .

3. Install the tiller handle harness.

   1. Position the cover(s) over the bracket, do not secure.

   2. On the D7E and D8T, route the harness through the cover and through grommet hole (8) .
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   Illustration 2	g02381719
   Covers removed for clarity.

   3. Reinstall the grommet.
      • D6T: Reuse the grommet from the disassembly procedure.

      • D7E: Reuse the grommet from the disassembly procedure. Install onto the new tiller harness and firmly press the grommet into place.

      • D8T: Install grommet (2) onto the tiller harness and firmly press into place.

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   Illustration 3	g02381720
   Typical paint mark on the harness.

   4. Locate the paint mark on the harness and tie strap the harness to the tab on plate (3). Secure the harness firmly using a tie strap gun. Refer to Illustrations 2 and 3 for the location of the straps.

   5. Align the handle keyway and woodruff key.
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   Illustration 4	g02381722

   6. Slide the handle onto the shaft and tighten the Allen bolt.

   Note: Perform Steps 3.g through 3.h for the D6T only.

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   Illustration 5	g02529076

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   Illustration 6	g02383541

   7. Install clip (7) on the ECM mounting bolt.

   8. Strap the tiller jumper harness and the mating harness to clip (7) .

   Note: Perform Step 3.i for the D7E only.

   9. Connect the mating tiller harness.

      Note: The main harness should be tie strapped to the bracket.

   Note: Perform Steps 3.j through 3.l for the D8T only.

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   Illustration 7	g02381718

   10. Connect the mating tiller harness.

   11. Tie strap the receptacle to the bracket assembly using the lower D-shaped cut in the bracket. Tighten with a tie strap gun. Refer to illustration 5 for D-shaped cuts.

   12. Connect the mating harness.

4. Reassembly all of the other components, harnesses, and secure the cover.