Figure 6C-4. Swing Motor (41Z125)
1. Coat the shaft splines and pilot diameter with a small
5. Position the new seal on the flange so that the rubber
amount of grease. Carefully position the motor on the re-
lip of the seal is facing the motor side of the flange.
ducer, making sure that the splines engage the sun gear
properly, and the pilot diameter seats in the reducer bore
6. Place the flange and seal in a vise which has a wooden
block on the rear jaw. Place a suitable driver between the
front jaw of the vise and seal.
2. Rotate the motor as required to position it in the same
position it was before removal. Secure the motor to the re-
7. Press the seal into the flange by tightening the vise. Stop
pressing the seal when the seal reaches the shoulder on the
inside of the bore. Install a new snap ring to secure the seal.
3. Attach the hydraulic lines to the appropriate ports of
the motor. Engage the pump drive, start the engine, and re-
8. Coat the new flange O-ring with a light coating of clean
lease the swing brake by lifting the swing brake lock button.
grease, and install the O-ring in the flange O-ring groove.
Then swing the upper slowly in both directions several
times to purge any air from the swing circuit. Check all
9. Carefully install the flange over the input shaft and onto
connections for leaks.
the motor. Do not turn the mounting flange while it is being
installed as this could damp the seal.
SWING MOTOR (41Z125)
10. Install the capscrews and lockwashers used to secure
the flange to the motor. Tighten the capscrews to 125 ft-lbs
GENERAL. Swing motor (41Z125) is used to convert hy-
draulic power from the swing hydraulic circuit into rotary
mechanical power to the swing transmission. The swing
speed is dependent on the amount of oil delivered to the
ports of the swing motor. The direction of rotation of the
To install a new or repaired motor, proceed as follows: