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Installing the New
Components
1. Lubricate and install the new O-rings onto the
fittings previously removed from the wheel motors.
2. Install the fittings into the wheel motor ports,
orientating them as noted in the removal process.
Note: The left wheel motor is identified with either
a yellow dot or with a ring machined into the shaft
of the motor, shown in Figure 2.
1. Machined ring in shaft
3. Position the wheel motor to frame. Mount the spring
clip, brake adapter and the wheel motor to the frame
with (4) 1/2 x 3 inch capscrews.
4. Install and tighten the (4) 1/2 inch lock nuts onto
the capscrews to secure the motor, brake adapter and
spring clip to the frame. Torque the screws to 67 to
83 ft-lb (91 to 113 N-m). Make sure spring clip is
positioned as shown in figure Figure 1.
5. Mount the brake assembly to the brake adapter with
(4) 3/8 x 3/4 inch capscrews. Torque the capcrews
to 27 to 33 ft-lb (27 to 45 N-m).
6. Thoroughly clean the wheel motor shaft and wheel
hub taper. Do not apply anti-seize or grease to
the hub or wheel motor shaft.
7. Install the new square key into the wheel motor shaft
key slot. Align the wheel hub with the square key
and slide the wheel hub onto the motor shaft. Secure
the hub with the locknut. Torque the locknut to 405
to 495 ft-lb (549 to 671 N-m).
Important: Use of a torque multiplier with a
standard torque wrench is not recommended,
but is a possible alternative to having a torque
wrench capable of 500 ft-lbs (678 N-m).
8. If there are signs of internal wheel motor or hydrostat
damage (i.e. metal or debris in the hydraulic fluid,
loss of traction or traction performance problems,
(Fig. 1)
1
g019201
Figure 2
etc.), specific testing and flushing procedures must
be performed. Contact your local distributor for
additional information.
9. Remove the caps or plugs from the disconnected
hydraulic lines and fittings
10. Lubricate and position the new O-rings onto the
wheel motor hydraulic fittings. Install the hydraulic
lines to wheel motor fittings positioning them as
noted in the removal process.
11. Secure the brake cable clevis to the brake actuator
lever with a clevis pin and cotter pin.
12. Install the brake drum, front wheel and extension
spring to the machine. Torque the lug nuts to 70 to
90 ft-lb (95 to 122 N-m).
Note: On models 03670, 03680 and 03690 with
serial numbers prior to 270001500, and model 03660
with serial numbers prior to 280000000, the brake
drum, part no. 108-6980, must be replaced with
brake drum, part no. 114-8864.
13. Repeat the procedure on the opposite wheel motor.
14. Install the new hydraulic filters as follows:
• Clean the area around the charge circuit/steering
filter (86–3010) mounting area and place a drain
pan under filter.
• Remove the filter.
• Lubricate the gasket on the new filter with
hydraulic oil.
• Ensure that the filter mounting area is clean.
• Install the filter by hand until the gasket contacts
the mounting surface, then rotate it an additional
1/2 turn.
• Repeat the procedure on the reservoir filter
(94–2621).
• Start the engine and let it run for about two
minutes to purge air from the system.
• Stop the engine and check for leaks
15. Check the hydraulic system oil level and replenish
as needed.
16. Test run the machine for a short period to check all
connections for leaks prior to installing the wheels.
17. Recheck the hydraulic system oil level and replenish
as needed.
18. Remove the jack stands and test drive the machine to
check performance.
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