28
6.3
Check the tension of the wheel chain by selecting the greatest length of unsupported chain and
measuring the amount of slack. This should not exceed 10 mm (3/8in.). If unsatisfactory, adjust as in
.
6.4
Refit cable guard and covers.
Wheel tracking
7
Adjustment of wheel tracking is usually necessary only if a chain has stretched or the chain tension has
been adjusted. Check the wheel tracking as follows:
7.1
Mark a straight line 6 m (20 ft) long on the studio floor or use an existing line.
7.2
Set the pedestal steering to Crab mode and position the pedestal near one end of the floor line
with two of the wheels just touching the line and aligned parallel with it.
7.3
Without turning the steering wheel, push the pedestal the whole length of the line and back
again. Note the distance the wheels have run away from or onto the line.
7.4
If the wheels run more than 50 mm (2in.) off the line, the tracking requires adjustment
.
7.5
Repeat the test for the two remaining pairs of wheels.
Lubrication
Steering chains and bearings
8
Lubricate the steering chains and bearings as follows:
8.1
Remove cable guard and covers.
8.2
Clean chains.
8.3
Using a cloth impregnated with chain lubricant, wipe over complete run of each chain.
8.4
Apply Nycolube 11B oil direct to bearing at the lower end of the steering shaft.
8.5
Apply Nycolube 11B oil direct to bearing under head mounting platform.
8.6
Refit cable guard and covers.
Change-over gear
9
Lubricate the change-over gear as follows:
9.1
Remove cable guard and covers.
9.2
Apply GP50 grease to the pinions of the change-over gear.
9.3
Apply a few drops of Nycolube 11B oil to centre of the change-over spindle.
