Removing/Installing The Drive Wheel Hub; Removing; Installing - Invacare Pronto M91 Service Manual

Removing/Installing the Drive Wheel Hub

NOTE: For this procedure, refer to FIGURE 8.6 on page 86.

Removing

1. Remove the drive wheel from the wheelchair. Refer to Removing/Installing the Drive
Wheel on page 84.
2. Remove hub and mounting hardware. Perform one of the following:
• All M91 300 lbs Limit Wheelchairs and 400 lbs Wheelchairs Built Before 12/19/03:
i. Fold down tab of existing locking tab washer (Detail "A" of FIGURE 8.6).
ii. Remove mounting bolt and locking tab washer (Detail "B" of FIGURE 8.6).
Discard existing locking tab washer.
iii. Remove the existing wheel hub and keystock from the drive shaft.
• All M94 Wheelchairs and 400 lbs M91 Wheelchairs built after 12/19/03 ‐ Remove
locknut, washer, keystock and existing drive wheel hub from the drive shaft.

Installing

DO NOT apply more than a 1-inch (in length) thin film of anti-seize compound to
the drive shaft. Applying more than 1-inch (in length) can cause the anti-seize com-
pound to leak resulting in damage to flooring (carpet, tile, etc.).
1. Apply a thin film of anti‐seize compound 1‐inch in length to the end of the drive shaft.
2. Reinstall drive wheel hub onto the drive shaft and spin the drive wheel hub to evenly
distribute the anti‐seize compound over the entire drive shaft.
3. Remove drive wheel hub from drive shaft.
4. Position the keystock on the drive shaft of the motor/gearbox assembly.
5. Reinstall drive wheel hub onto the drive shaft of the motor/gearbox assembly.
6. To secure the wheel hub to the drive shaft, perform one of the following:
• All M91 300 lbs Wheelchairs and 400 lbs Wheelchairs Built Before 12/19/03:
Failure to properly install locking tab washer can result in wheel separation and
potential user injury or property damage. When replacing wheels always use a new
locking tab washer. DO NOT reuse locking tab washers.
i. The locking tab of the locking tab washer MUST be inserted into the hub cutout
(Detail "B" of FIGURE 8.6).
Part No. 1125038
CAUTION
WARNING
85
SECTION 8—WHEELS
®
Pronto M91™and M94™