Stairmaster 4000 PT series, Owner'S Manual

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Page 47
6. Lubricate the chain with 30W motor oil and wipe off the excess.
7. Reinstall the covers.
DRIVE HUB ASSEMBLY
1. Remove the side covers.
2. Remove the step chain retainers.
3. Support the pedal arm. Unhook the pedal arm return spring from the
spring hanger. Lift the step chain up and off the clutch sprocket and
lower the pedal arm to the floor. Repeat on the other side.
4. Remove the snap ring from the left end of the drive shaft (see Figure
9).
5. Remove the drive chain.
6. Remove the sprocket and the other small parts from the left side of
the hub assembly (see Figure 9).
7. Slide the drive shaft to the right, out of the hub assembly. If you
remove the right-hand clutch sprocket from the drive shaft, do not
confuse it with the left-hand clutch sprocket.
8. Loosen and remove the two remaining bolts and nuts that hold the
hub assembly to the frame. Remove the hub assembly.
9. Inspect the drive shaft, bushings, thrust washers, and clutch sprock
ets for excessive wear or pitting. Replace any worn components.
PARTS REMOVAL AND REPLACEMENT
TO REDUCE THE RISK OF EYE INJURY, WEAR EYE
PROTECTION WHEN REMOVING SNAP RINGS.
!
WARNING