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9.2 Identifying and Repairing Faults
Fault
The wheelchair does not
travel in a straight line
The brakes are gripping
poorly or asymmetrically
Rolling resistance is very
high
The castors wobble when
moving fast
The castor is stiff or stuck
1551536-C
Possible cause
Incorrect tyre pressure on one rear wheel
One or more spokes broken
Spokes tightened unevenly
Castor bearings are dirty or damaged
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
Bearings are dirty or faulty
Action
Correct tyre pressure, → 11.2 Tyres, page 50
Replace faulty spoke(s), → qualified technician
Tighten loose spokes, → qualified technician
Clean the bearings or replace the castor,
→ qualified technician
Correct tyre pressure, → 11.2 Tyres, page 50
Correct the brake setting, → qualified technician
Correct tyre pressure, → 11.2 Tyres, page 50
Ensure the rear wheels are parallel,
→ qualified technician
Tighten the nut on the bearing block axle slightly,
→ qualified technician
Change castor, → qualified technician
Clean the bearings or replace the castor,
→ qualified technician
Troubleshooting
47
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