REMOVING/INSTALLING Gearbox

RWD WHEELCHAIRS	PROCEDURE 16

(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.

	5/16-18 x	5/16-18 x
	2-1/2-inch
		1-1/4-inch
	Hex
		Hex
	Screws
		Screws

Suspension

Arm

Gearbox

Motor

FIGURE 10 - REMOVING/INSTALLING GEARBOX

R W D

W H E E L C H A I R S

3.Removethefour(4)hexscrewsthatsecuretheexisting motor/gearbox to the suspension arm.

4.Removeexistingmotorfromgearbox.RefertoMOTOR REPLACEMENT in PROCEDURE 12 of this manual.

5.Installexistingmotorontonewgearbox.RefertoMOTOR 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 Loctite242andtorquehexscrewsto160-inchpounds.

NOTE: Replace any parts that show signs of wear or dam- age.

3.Reinstall the drive wheel hub to the new gearbox driveshaft.RefertoREMOVING/INSTALLINGDRIVE WHEEL HUBS in PROCEDURE 12 of this manual.

4.Reinstallthedrivewheelsontothewheelchair.Referto REMOVING/INSTALLINGDRIVEWHEELSinPRO- CEDURE 12 of this manual.

ADJUSTING WEIGHT DISTRIBUTION (FIGURE 11)

NOTE: Seat mount plates and seat support brackets al- lowtheseatframetoberepositionedalongthebaseframe. The range is determined by position of the seat stop screws.Thefront seatstopscrewispositionedat4-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- edgeofwhattoexpectifthefollowingadjustmentsaremade.

1. Movingtheseatforward.

Advantage:	This adjustment allows more clear-
	anceforfrontriggingsandamorestable
	“feel” for the user.

Disadvantage: Moreweightisputonfrontcastersand makes turning more difficult.

NOTE: This option can also be accomplished by moving the motor backward on the suspension arm. Refer to RE- POSITIONINGGEARBOX inthisprocedureofthemanual.

RWD WHEELCHAIRS