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Maintenance And Repair 7-4
Replacing the Stones
1 Cut power supply (main switch QS1 on OFF)
2 Remove upper cover plates C1, front cover plates C2 and remove central cover
plate C3 (fig. 1)
3 Space the stones by turning knob A (fig. beside) clockwise
4 Open stone belt guard PCM by unscrewing knob P2 (fig. 1)
5 Open grinding stone guard PM (fig. 1)
6 Remove the belt
7 Space the dressers by means of knob C (fig. beside) (with option corundum
grinding wheels)
8 While retaining the pulley with a wrench, unscrew the stone lock nut
(counterclockwise for the lower stone, clockwise for the upper stone)
9 Carefully clean the seats
10 Mount and lock the new stones
11 Approach the stones to each other by means of knob A (fig. beside)
12 Manually turn the stone spindles and make sure that both stones touch the knife
simultaneously
If they do not: adjust by means of knob B (fig. beside)
13 Remount the belt
14 Remount the cover plates
Replacing the Knife Guide Gibs
The guide gibs are anti-friction coated. They must be replaced when worn out.
They shall not be altered or reconditioned.
To replace the lower gib, the knife must be removed. It is, therefore, advisable to
replace the gibs when knife replacement becomes necessary (par. 7-3).
1 Remove the gibs
2 Carefully clean the new gibs
3 Clean their seats
4 Put on the gibs and make sure that their back fits
5 Tighten the screws gradually
6 Put on the knife (par. 7-3)
Replacing the Upper Knife Back Guide
1 Move back wedges CUS of the upper knife back guides and lock them in position
with knob P4 (fig. 1)
2 Remove the ball pins AG (fig. beside)
3 Remove upper guide plate PAS (fig. 1)
4 Replace the two knife back guides GD (fig. 1) and remount the upper guide plate
proceeding in reverse order
Replacing the Lower Knife Back Guide
This requires the removal of the knife. It is, therefore, advisable to replace this guide
when knife replacement becomes necessary (par. 7-3).
1 Remove part S3 (fig. 1)
2 Clean the seat and mount the new guide
Maintenance
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