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13.3 Inspection
The motor/gearbox/wheel assembly is mounted securely to the motor, which should be
securely attached to the side frame.
Check the tyre for excessive wear and the wheel for signs of damage.
Check for rim-rock which will indicate worn bearings and/or stub axle. Maximum allowable
is 5mm total.
Check for end-float which will indicate worn thrust washers. Maximum allowable is 3mm.
Check that the free-wheel mechanism engages and dis-engages freely and that the drive
dogs do not have rounded corners.
Check the drive securing bolt in the end of the drive shaft is tight and the tab washer is bent
up for security.
Check the motor loom for damage and that the plug wiring is secure.
Check for unusual noises such as whining or rubbing which might indicate that the solenoid
brake is touching the cowl.
Move the joystick around the quadrant and check that when released it self-centres and
the brakes operate.
An audible click will be heard from each motor when the brakes are applied and released.
Raise the rear of the powerchair and support on suitable stands. Engage the drive
mechanism and move the joystick around the quadrant to simulate forward, reverse and turning.
Observe the wheel rotation to ensure it mirrors joystick movement and check for any wheel/tyre
distortion.
13.4 Power System Removal
If it is required to remove the complete drive assembly as one unit the following procedure
applies.
Support the rear of the powerchair on suitable stands and disconnect the motor wiring
loom from the main loom. Using 19mm spanners release the M12 nut (SF-602) which attach the
mounting plate to the side frame. Remove M6 hex nut and bolt immediately underneath the
bottom of the push handle and withdraw the wheel/motor assembly.
13.5 Power System Replacement
Replacement is a straightforward reversal of the above procedure. The attachment nuts
and bolts should be renewed and tightened to a torque of 35 lbs/ft (47Nm).