Motor/Gearbox/Brake - Invacare Pronto M41 Series Service Manual

®
Invacare - PRONTO M41
6.1.3

Motor/Gearbox/Brake

Problem
Motor makes a
clicking noise.
Grinding noise
or motor is
locking up.
Motors stall
and start up
again.
Motor chatters
or runs
erratically, or
only one motor
turns.
Wheelchair
veers to the left
or right when
driving on level
surface.
Gearbox is
leaking fluid.
Excessive
clicking
coming from
motor/gearbox.
Rough driving.
Motor stutters.
Motor fails to
start after
initial
installation.
Motor is
running then
fails to restart
when stopped.
Probable Cause
Bad bearings.
Raised commutator
plate inside of motor.
Bad bearings. Bad
gears.
Current rollback.
Damaged connector
or worn brushes.
Bad motor or gear
box.
Motor release lever
is disengaged.
Power module
malfunction.
Uneven tire
pressure. Motors out
of balance.
Bad seal around
drive shaft.
Loose hardware.
Bad bearing in motor
or gearbox.
Loose wheel
hardware.
Gearbox shaft
movement or bent
shaft.
Poor connection or
worn brushes.
Battery voltage is too
low.
Bad connection.
Brake disengaged.
Heavy load on the
motors forcing
power module into
the current rollback
mode.
Solutions
If bearings are bad, replace
motor.
Ohm out motor and replace
motor if high reading is present.
Normal reading is
0.5-5 Ohms.
Replace motor/gearbox.
Stop driving and let electronics
cool.
Ohm out motors. Replace
motor/gearbox if high reading is
present. Normal reading is 0-5
Ohms.
Engage motor release levers.
Check for error codes with
programmer.
Inflate tires. Replace tires if
worn.
Use programmer to balance
motors.
If seal is bad, replace
motor/gearbox.
If loose hardware is found
retighten hardware.
Replace motor/gearbox:
Tighten hardware, (use
removable Loctite™on
hardware).
Replace motor/gearbox.
Check DCL connectors. Check
motor and replace if necessary.
Check batteries and recharge if
necessary.
Check connector. Engage
brake.
Leave power On and allow
power module to count down,
and recharge the batteries
overnight with power On.
SERVICE MANUAL
Documentation
See chapter 8.6.1.
See chapter 7.1
or chapter 8.6.1.
See chapter 8.6.1
See chapter 7.1,
chapter 7.2 or
chapter 8.6.1.
See chapter 8.4.1.
See electronics
manual.
See chapter 7.2
or chapter 8.6.1.
See chapter 8.6.1.
Follow torque
settings in this
manual.
See chapter 8.6.1.
See chapter 8.6.1.
See chapter 8.7.
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