Motor/Gearbox/Brake - Invacare Pronto M91 Service Manual

SYMPTOM
Battery indicator flashes the charge
level is low - immediately after
recharge.
Battery indicator flashes the charge
level is low - too soon after being
recharged.
Motor "chatters" or runs irregular.
Joystick erratic or does not respond
as desired.
Wheelchair does not respond to
commands.
Power indicator Off - even after
recharging.

Motor/Gearbox/Brake

SYMPTOM
Bad coupler between motor and
gearbox or bad bearings.
Motor makes a
clicking noise.
Raised commutator plate inside of
motor.
Bad gearbox.
Grinding noise or
Bad coupler between motor and
motor is locking up.
gearbox or bad bearings. Bad gears.
Motors stall and Current rollback.
start up again.
Wheelchair will not Check motor locks.
drive with power
on (E09 or E10).
Damaged connector or worn
Motor chatters or
brushes.
runs erratically, or
Bad motor or gear box.
only one motor
Controller malfunction.
turns.
Part No. 1125038
SECTION 3—SAFETY INSPECTION/TROUBLESHOOTING
PROBABLE CAUSE
Battery failure.
Malfunctioning battery charger.
Electrical malfunction.
Batteries not charged.
Weak batteries.
Electrical malfunction.
Damaged motor coupling.
Electrical malfunction.
Controller programmed
improperly.
Poor battery terminal
connection.
Electrical malfunction.
PROBABLE CAUSE
29
SOLUTIONS
Check batteries for shorted cell.
Replace if necessary.
Contact Dealer/Invacare for Service.
Contact Dealer/Invacare for Service.
Have charger checked.
Replace batteries if necessary.
Contact Dealer/Invacare for Service.
Contact Dealer/Invacare for Service.
Contact Dealer/Invacare for Service.
Contact Dealer/Invacare for Service.
Contact Dealer/Invacare to have
controller reprogrammed.
Have terminals cleaned.
Contact Dealer/Invacare for Service.
SOLUTIONS
Replace coupler.
If bearings are bad, replace motor.
Ohm out motor and replace motor if high reading
is present. Normal reading is 0.2-5 Ohms.
Replace gearbox.
Replace coupler.
If bearings are bad, replace motor.
Stop driving and allow electronics cool.
Engage motor locks to drive wheelchair.
Ohm out motors. Check brushes and replace
brushes if necessary. Replace motor if high reading
is present. Normal reading is 0-5 Ohms.
Check for error codes with programmer. Refer to
electronics manual, part number 1114808.
Pronto® M91™and M94™