Norton Commando Workshop Manual

## Routine Maintenance

# K

### SECTION K9

### PRIMARY CHAINCASE OIL CHANGING

Remove the footrest and place a metal tray under the chaincase. Unscrew the central fixing bolt (see Fig. K6) and break the joint to allow the oil to drain into the tray. Wash out the case with clean kerosene (paraffin). Refit the outer case and remove the filler cap, and level plug (B). Pour fresh oil into the filler cap orifice (C) until it begins to run from the level plug hole. Allow the surplus to drain off and refit the level plug and filter cap. Refit the footrest.

### SECTION K10

### SWINGING ARM PIVOT LUBRICATION

For lubrication purposes, a grease nipple (D) is used on 3 the plate covering the right side of the swinging arm bush housing.
To maintain the oil content, use a grease gun filled with S.A.E. 140 oil and inject oil sufficient to fill the cavity every 5,000 miles, alternatively, remove the oil nipple and fill with an oil gun. It is important to check that the cavity is filled. The only means of chacking is to remove the spindle locating bolt (see in Fig. F9) and fill until oil runs from the hole. Refit the bolt.

### SECTION K11

### FRONT FORK OIL CHANGING

Under normal conditions the front forks will require no servicing other than an occasional change of oil. Should the oil level become low it will be indicated by excess movement of the forks, but only after considerable mileage.
Each fork leg is provided with a drain scrow (see Fig. G5) and each leg should be treated separately. Remove the drain scrow, take care not to lose the small fibre sealing washer. Take the machine off the stand, apply the front brake and move the forks up and down to expel the oil. Allow a few minutes for draining and repeat the operation with the other leg. Whilst draining the right fork leg, the forks should be turned on full right lock, and conversely for draining the left fork leg.
Refit the drain screws, place the machine on the centre stand. Remove handlebars to improve accessibility.
Unscrew the large filler plug at the top of each lag, remove the speedometer and tachometer and lift the front wheel to expose the springs.
Support the wheel with a block of wood to hold the springs clear. Using two spanners, unscrew the filler plugs from the damper rods.
Remove the wooden block and allow the forks to extend fully. Pour in a measured 150 cc (5 fl. oz.) of oil into each leg (see Fig. K7). Because of the springs

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