Service; Tightening Torques; Troubleshooting; Wheels - Invacare Pronto M61 Service Manual

Invacare® Pronto™ M61 Series with SureStep®

4 Service

4.1 Tightening torques

CAUTION!
Damage can be caused to the mobility device due
to improperly tightened screws, nuts or plastic
connections.
– Always tighten screws, nuts etc to the stated tightening
torque.
– Only tighten screws or nuts which are not listed here
fingertight.
The tightening torques stated in the following list are based on the
thread diameter for the nuts and bolts for which no specific values
have been determined. All values assume dry and de-greased threads.
Thread
M4
M5
M6
M8
M10
M12

4.2.1 Wheels

Problem
Mobility device veers
left/right
Sluggish turn/performance
Casters flutter
Squeaks and rattles

4.2.2 Motor/Gearbox/Brake

Problem
Motor makes a clicking noise
8
Tightening torque in
Nm ±10%
3 Nm
6 Nm
10 Nm
25 Nm
49 Nm
80 Nm
Probable cause
Incorrect/unequal tire pressure
Loose stem nuts/bolts
Incorrect/unequal tire pressure
Loose stem nuts/bolts
Incorrect/unequal tire pressure
Loose stem nuts/bolts
Loose stem nuts/bolts
Probable Cause
Bad bearings
Raised commutator plate inside of motor
Thread
M14
M16
UNC Thread
1/4"-20
5/16"-20
3/8"-16
7/16"-14
1/2"-13
9/16"-12
5/8"-11
3/4"-1
7/6"-9
1"-8

4.2 Troubleshooting

– For troubleshooting information and explanation of
error codes, refer to the wheelchair base user manual
and the individual Electronics Manual supplied with
each wheelchair.
Solutions
If pneumatic, check tires for
correct and equal pressure.
Tighten stem nuts/bolts.
Check that casters contact
ground at the same time.
If pneumatic, check tires for
correct and equal pressure.
Tighten stem nuts/bolts.
If pneumatic, check tires for
correct and equal pressure.
Tighten stem nuts/bolts.
Check that casters contact
ground at the same time.
Tighten stem nuts/bolts.
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.
Tightening torque in
Nm ±10%
120 Nm
180 Nm
Tightening torque in
Nm ±10%
11–7 Nm
22–14 Nm
41–25 Nm
67–40 Nm
100–60 Nm
150–90 Nm
210–130 Nm
370–230 Nm
600–370 Nm
900–550 Nm
Documentation
Refer to Technical specifications
inside the user manual.
Refer to 4.6.1 Removing/Installing
the drive wheel, page 17.
Refer to Technical specifications
inside the user manual.
Refer to 4.6.1 Removing/Installing
the drive wheel, page 17.
Refer to Technical specifications
inside the user manual.
Refer to 4.6.1 Removing/Installing
the drive wheel, page 17.
Refer to 4.6.1 Removing/Installing
the drive wheel, page 17.
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