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™

Page 25
Image 25
Invacare M71 service manual Tion. Replace motor or gearbox if contamination