Stairmaster 4000 PT series, Owner'S Manual

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10. To reinstall the hub assembly, carefully reverse the disassembly
procedures. Be sure that the right- and left-hand clutch sprockets are
positioned correctly; the wide shoulder of the sprocket should be
facing away from the hub on both sides.
11. Chain Tension. The drive shaft is mounted in an eccentric hub (see
Figure 10). Rotate the hub so the marked hole is in the 12 o’clock
position, lining up four holes in the hub with the four holes in the
frame. Use this hub position when reinstalling the drive chain since
the distance between the drive and transmission shafts is at a
minimum. The hub is in the proper position when the drive chain has a
total of 1" to 1-1/2" (2.5 to 4.0 cm) of play at the slackest point. As the
drive chain stretches with use, increase the chain tension (and the
distance between the two shafts) by rotating the hub counterclock
wise. The distance between the two shafts is greatest when the
marked hole in the hub is at the 8 o’clock position.
12. Reinstall the covers.
HANDGRIPS
1. Order the field installable handgrip kit from your local
representative and follow the instructions included with the kit.
HANDLEBAR
1. Unscrew the main cable connector from the receptacle on the
back of the console.
2. Unscrew the four console mounting screws and remove the
console from the machine.
3. Lift the rear tube of the frame. Tip the machine forward so it is
resting on the front portion of the frame.
4. Remove the two bolts that hold the handrail to the frame tube.
PARTS REMOVAL AND REPLACEMENT