Identifying And Repairing Faults - Invacare Action 4 NG Series User Manual

Invacare® Action 4 NG

9.2 Identifying and repairing faults

Fault
The wheelchair does not
travel in a straight line
The wheelchair tips
backwards too easily
The brakes are gripping
poorly or asymmetrically
Rolling resistance is very
high
The castors wobble when
moving fast
68
Possible cause
Incorrect tyre pressure on one rear wheel
One or more spokes broken
Spokes tightened unevenly
Castor bearings are dirty or damaged
Rear wheels are mounted too far forwards
Back angle too large
Seat angle too large
Incorrect tyre pressure in one or both rear
tyres
Brake setting incorrect
Tyre pressure in rear tyres is too low
Rear wheels not parallel
Too little tension in castor bearing block
Castor has worn smooth
Action
Correct tyre pressure, → 11.2 Tyres, page 72
Replace faulty spoke(s), → qualified technician
Tighten loose spokes, → qualified technician
Clean the bearings or replace the castor,
→ qualified technician
Mount the rear wheels further back, → qualified
technician
Reduce the backrest angle, → qualified technician
Mount the castor upper on the front fork,
→ qualified technician
Select a smaller front fork, → qualified technician
Correct tyre pressure, → 11.2 Tyres, page 72
Correct the brake setting, → qualified technician
Correct tyre pressure, → 11.2 Tyres, page 72
Ensure the rear wheels are parallel, → qualified
technician
Tighten the nut on the bearing block axle slightly,
→ qualified technician
Change castor, → qualified technician
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