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REMOVING/INSTALLING
GEARBOX
(FIGURE 10)
CAUTION
Perform the following procedure in a des-
ignated work area to prevent damage to
flooring (carpeting, tile, etc.).
Removing
1. Remove the drive wheels from the wheelchair. Refer to
REMOVING/INSTALLING DRIVE WHEELS in PRO-
CEDURE 12 of this manual.
2. Remove the drive wheel hub from the existing gearbox
drive shaft. Refer to
REMOVING/INSTALLING DRIVE
WHEEL HUBS in PROCEDURE 12 of this manual.
NOTE: Note mounting position of gearbox to suspension
arm before disassembly.
NOTE: To reposition the gearbox on the suspension arm,
refer to
WEIGHT DISTRIBUTION in this procedure of the
manual.
3. Remove the four (4) hex screws that secure the existing
motor/gearbox to the suspension arm.
4. Remove existing motor from gearbox. Refer to
MOTOR
REPLACEMENT in PROCEDURE 12 of this manual.
5. Install existing motor onto new gearbox. Refer to
MOTOR
REPLACEMENT in PROCEDURE 12 of this manual.
Installing
CAUTION
The REAR hex screws that secure the gear-
box to the suspension arm MUST be 5/16-
18 x 2-1/2-inches long and the FRONT hex
screws that secure the gearbox to the sus-
pension arm MUST be 5/16-18 x 1-1/4-inches
long. Otherwise damage to the gearbox
casting can result.
1. Position NEW gearbox with noted mounting holes.
2. When reassembling gearbox to suspension arm, use
Loctite 242 and torque hex screws to 160-inch pounds.
NOTE: Replace any parts that show signs of wear or dam-
age.
3. Reinstall the drive wheel hub to the new gearbox
driveshaft. Refer to REMOVING/INSTALLING DRIVE
WHEEL HUBS in PROCEDURE 12 of this manual.
4. Reinstall the drive wheels onto the wheelchair. Refer to
REMOVING/INSTALLING DRIVE WHEELS in PRO-
CEDURE 12 of this manual.
5/16-18 x
1-1/4-inch
Hex
Screws
Gearbox
Suspension
Arm
FIGURE 10 - REMOVING/INSTALLING GEARBOX
Motor
5/16-18 x
2-1/2-inch
Hex
Screws
RWD WHEELCHAIRS PROCEDURE 16
R
W
D
W
H
E
E
L
C
H
A
I
R
S
ADJUSTING WEIGHT
DISTRIBUTION (FIGURE 11)
NOTE: Seat mount plates and seat support brackets al-
low the seat frame to be repositioned along the base frame.
The range is determined by position of the seat stop
screws. The front seat stop screw is positioned at 4-inches
and the rear seat stop screw is positioned at 10-inches.
Both seat stop screw positions are measured from the
front of the base frame.
NOTE: The position of the seat support brackets is factory
set at 7-inches, this measured from the front of the base
frame to the front of the seat support bracket. This will put
about 70% of the total weight of the chair and user over the
large wheels. However, this setting may not be the most de-
sirable in terms of maneuverability, front rigging clearance
and comfort for the user.
Adjustment Options
NOTE: This section will provide the user with some knowl-
edge of what to expect if the following adjustments are made.
1. Moving the seat forward.
Advantage: This adjustment allows more clear-
ance for front riggings and a more stable
feel for the user.
Disadvantage: More weight is put on front casters and
makes turning more difficult.
NOTE: This option can also be accomplished by moving
the motor backward on the suspension arm. Refer to
RE-
POSITIONING GEARBOX in this procedure of the manual.