Usage:
Challenger 65C, 70C, 75C, and 85C Tractors
A higher torque steering motor is now available to improve steering performance in high load applications. With the standard torque motor, high load applications would cause the motor to work at or near its torque capacity. This new high torque motor is now available as a factory attachment and can also be retrofit on all Challenger C-Series machines.
To retrofit the high torque motor on C-Series machines, follow the procedures in the steps listed below.
Procedure To Install High Torque Steering Motor
NOTE: The installation procedures for the high torque steering motor are covered in the following steps. Do not discard any parts that are removed, until all assembly procedures are complete. Some of the removed parts will be used later in this procedure.
Illustration 1. Side view and top view of high torque steering motor installation.
Illustration 2. Top view.
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Hot oil and components can cause personal injury. Do not allow hot oil or components to touch the skin. Be sure that the steering motor and oil are cool enough to touch with your bare hand prior to performing any service work.
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1. Disconnect the left and right steering hose assemblies and the drain line from the steering motor. Remove the old steering motor from the machine. See the appropriate service manual module for your machine for the correct procedure to remove the steering motor.
2. Install a new seal (1) on motor (2).
3. Install the new motor (2) on the differential cover using the old bolts and washers.
4. Loosen the hose retaining clamps on the left steering hose and remove the small floor plate just inside of the operators compartment.
5. Disconnect and remove the left steering line hose assembly from the steering pump.
6. Replace the old left steering line hose assembly with hose assembly (3).
7. Assemble one new seal (4), one spacer (5), and one additional seal (6) to hose assembly (3). Secure the spacer, seals, and hose assembly to motor (2) using the old washers and four new bolts (7).
NOTE: Be sure to orient the spacer (5) with the open port pointing up.
8. Using a new seal (10), install a new nipple assembly (9) and cap into the port in spacer (5).
9. At point (A) where the old steering hose assembly was disconnected from the steering pump, connect hose assembly (3) using new seals (4) and (6). Secure the hose assembly to the steering pump using the same washers, bolts and flanges removed in step 5.
10. Tighten all clamps and flanges on left steering hose assembly (3). Be sure that the hose assembly does not rub anywhere.
11. Disconnect the right steering line hose assembly from the steering pump. Disconnect all clamps holding the right steering line hose assembly and remove from the machine.
12. Replace the old right side steering line hose assembly with hose assembly (11).
13. At point (B) where the old right steering hose assembly was disconnected from the steering pump, connect hose assembly (11) using new seals (4) and (6). Secure the hose assembly to the steering pump using the same washers, bolts and flanges removed in step 11.
14. Assemble one new seal (4), one spacer (5), and one additional seal (6) to hose assembly (11). Secure the spacer, seals, and hose assembly to motor (2) using four new bolts (7) and the old washers.
NOTE: Be sure to orient the spacer (5) with the open port pointing up.
15. Using a new seal (10), install a new nipple assembly (9) and cap into the port in spacer (5).
16. Tighten all clamps and flanges on right steering hose assembly (11). Be sure that the hose assembly does not rub anywhere.
17. Remove the 6V-8642 Connector from the old motor and install on the new motor (2) at the rear drain port (C) using a new seal (8).
NOTE: It may be necessary to move the plug from the rear drain port to the front drain port depending on the shipping configuration of the steering motor.
18. Connect the drain line that was disconnected in step 1 to the 6V-8642 Connector and the steering motor using two new seals (12).
19. Check to make sure that all clamps and lines are securely attached and not interfering or rubbing.
20. Install the floor plate that was removed in Step 4.