Norton Commando Workshop Manual

## Frame and Ancillaries

# F

### SECTION F6

### REAR SUSPENSION UNITS (GIRLING)

The rear suspension units are of the spring controlled, oil damped, telescopic type. Adjustment of static spring loading is accomplished by rotating the three position castellated cam ring at the bottom of the spring. To adjust, support the motorcycle on the centre stand and use a 'C' spanner to turn the cam ring. Turning the cam ring to the left increases the loading to cope with additional loads and vice versa. Both units must be on the same loading - if in doubt, start bath units from the light load position. The damper units are factory sealed thus cannot be serviced. The springs can however be removed. Bonded rubber bushes are used top and bottom for mounting the suspension units. These can be pressed out for replacement and new ones pressed in, smeared with a lubricant such as soap to ease entry.

### SECTION F7

### CHANGING THE SPRING

In order to change a spring it is recommended that the suspension unit is gripped in a vice by the bottom mounting. Turn the castellated cam ring to the light load position. The help of a second operator is needed so that as the spring is grasped firmly in both hands and compressed down, the second operator lifts clear both split collars. Pressure on the spring is now released and the spring can be lifted clear. Reassembly is a reversal of these instructions.

### SECTION F8

### REBUSHING THE SWINGING FORK

After long useage, where lubrication has been neglected or where grease has been used instead of the recommended SAE 140 oil, the two flanged bushes working on the spindle may wear. After removal of the swinging fork (Section F1 (9-15) wash all parts very thoroughly in gasoline (petrol). Insert the pivot spindle and check the fit. Excessive working clearance will permit unacceptable side movement at the rear wheel and this must be rectified by renewing the spindle, bushes and oil sealing 'O' rings. Renewal of these items should be dealt with as follows:

1 | If not displaced during removal of the fork, lift out the outboard 'O' rings (see Fig. F10).
2 | Using a light press and a suitable shouldered press tool, press out the first bush, releasing the large 'O' ring and dust cover.
3 | Repeat for the second bush.
New bushes are pre sized and do not require reaming after fitting. Assemble as follows:
4 | Place the dust cover over the bush as in Fig. F10 and press the bush in fully.
5 | Place the large 'O' ring in the dust plate.
6 | Repeat for the second dust cover, bush and 'O ring.
7 | Place the smaller 'O' rings in the bush recess of the swinging arm.
The swinging arm is now ready to refit to the motorcycle, using a new spindle if the original shows signs of wear.

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