|
Fault. |
Cause. |
Remedy. |
|
Fork is stiff in action. |
Lack of lubricant on bearings. |
Apply grease gun (six shots). |
|
Ditto |
Wheel spindle incorrectly adjusted. |
Slacken clamp on axle fitting. Bounce fork a few times, and re-tighten. |
|
Ditto |
Fork crown clamp bolts so tight that outer tube becomes distorted, and presses on piston. |
Slacken bolts until fork moves freely. |
|
Ditto |
Split bearings PD 1677 have been assembled with foreign matter beneath them, causing tightness in bore. |
Dismantle split bearings, and remove high spots. |
|
Malalignment. |
|
See instructions on Removing Front Wheel (Re aligning outer tubes). Pages 15 |
|
Fork is stiff in action. |
Outer or inner tubes damaged accidentally. |
Replace. |
|
Insufficient damping |
Lack of oil. |
Top up. |
|
Ditto |
Viscosity of oil too low in tropical climates. |
Replace oil with Mobiloil BB or Castrol XL. |
|
Damping too fierce. |
Oil too viscous. |
Replace oil with recommended grade. If this is already in use, excessively low temperatures will have the same effect, but this is not usually serious, as the additional damping improves the steering characteristics under icy road conditions. |
|
Fork "bottoms" readily. |
Lack of air. |
Inflate to correct position. |
|
Ditto (fork correctly inflated with air) |
Lack of oil. |
Top up. |
|
Fork hammers on full extension. |
Over inflation. |
Deflate to correct position. |
|
Fork loses air pressure (oil traces on lower sliding tubes) |
Leaking gland ring. |
Replace. Examine bores for scores. If these are too deep to be polished out, replace outer tubes. |
|
Ditto |
Leaking static seal on piston PP 17-1. |
Replace faulty seal. |
|
Ditto (oil traces around top of outer tube) |
Leaking static seal PD 17-22 on top internal fitting. |
Replace faulty seal. |
|
Ditto (no oil leakage). |
Leaking inflation valve core; or Leaking inflation valve washer PD 1561-43, or Leaking static seal PP 17-22; or Leaking static seal PP 17-17; or Leaking balance pipe |
Replace faulty part. |