Invacare M71 service manual Tion. Replace motor or gearbox if contamination

SECTION 3—SAFETY INSPECTION/TROUBLESHOOTING

SYMPTOM	PROBABLE CAUSE	SOLUTIONS
	Damaged connector or worn	Ohm out motors. Check brushes and replace
Motor chatters or	brushes.	brushes if necessary. Replace motor or gearbox if
runs erratically, or	Bad motor or gearbox	high reading is present. Normal reading is 0-5
only one motor		Ohms.
turns.
	Controller malfunction.	Check for error codes with programmer. Refer to
		electronics manual, part number 1114808.
Wheelchair veers	Uneven tire pressure.	Inflate tires
to the left or right	Motors out of balance.	Replace tires if worn.
when driving on		Use programmer to balance motors
level surface.
E09/E10 error code	Bad motor connection.	Check all connections. Ohm out each brake coil.
will not go away.	Bad brake coil.	Normal reading is 45-50 Ohms.
	Bad seal around drive shaft	If seal is bad, replace motor or gearbox. Remove
Gearbox is leaking		motor brushes and inspect for grease contamina-
		tion. Replace motor or gearbox if contamination
Fluid.
	Loose hardware.	is found.
		If loose hardware is found retighten hardware.
Excessive clicking	Bad bearing in motor or gearbox.	Replace motor or gearbox.
coming from
	Loose wheel hardware.	Tighten hardware, (use removable Loctite™on
motor/gearbox.		hardware). Follow torque settings in this manual.
Gearbox shaft	Rough driving.	Replace motor or gearbox.
movement or bent
shaft.
Motor Stutters.	Poor connection or worn brushes.	Check motor connectors. Check brushes and
		replace if necessary.
Motor Fails to start	Battery voltage is too low.	Check batteries and recharge if necessary.
after initial installa-	Bad Connection	Check connector
tion.	Brake Disengaged	Engage brake
	Heavy load on the motors forcing	Leave power ON and allow controller to count
	controller into the current rollback	down, and recharge the wheelchair overnight with
	mode.	power ON.
	Blown fuse in battery wiring	Replace battery wiring harness.
	harness.
Motor is running
	Damaged Motor	Replace brushes if necessary, or replace motor or
then fails to restart
		gearbox if internal damage is determined.
when stopped.
		Ohm out motor to check for possible internal
		damage (worn out brushes may be possible).
	Controller power stage board or	Replace controller or send to Invacare for repair.
	relays may be damaged.
Motor runs but	Controller senses heavy load and	Stop driving and let electronics cool.
	has entered the current rollback
loses power.
	mode.
Wheelchair loses all	Bad Connection on wheelchair	Turn power “OFF”, wait 10 seconds and turn
		power back “ON”.
power while
		Check Joystick connection
driving.
		Check Battery connection and fuses

Part No 1118377 25 Pronto® M71™