Circle Guides - Case 845B VHP Operator's Manual

Check and Adjust
The circle and circle guides must be kept clean to prevent
caking. If the circle guides are excessively loose, the gear
teeth will wear, causing the circle turn to function errati-
cally.
Guide nuts
Tightening torque: 110 kgf.m
Radial
clearancel
max. 0,76 mm
Shims

CIRCLE GUIDES

7-8
CHAPTER 7 – MAINTENANCE AND ADJUSTMENT
CIRCLE GUIDES
blade
Lock nut
Wear Plate Adjustment
The first adjustment is to eliminate play between the
upper wear plates and the upper circle guides (vertical
clearance).
To make this adjustment, shims between wear plates and
the upper circle surface must be removed.
NOTE: Do not throwaway the shims that were removed.
They can be used again in other new adjustment.
Make sure that the maximum clearance does not exceed
1.52 mm. This adjustment must be completed on each
of the four (4) guides, one at a time, beginning with one
closest to the circle turn motor pinion gear.
After vertical adjustment rotate the circle 360° to be sure
that the circle turns freely.
Next, adjust the clearance between the wear plates and
the inner circle guides (radial clearance), proceeding as
follows:
With the vertical clearance already adjusted, loosen the
circle guide nuts and the jam nuts of radial clearance ad-
justing screws.
Shims
Guide
Radial clearance
min. 0,76 mm
max. 1,52 mm
Position the circle turn motor pinion in such a way that the
tooth engagement is as shown below.
Make sure that the center of the circle turn motor pinion,
center line of the engaged tooth and the front guide center
locknut are aligned.
Put one flank of the pinion tooth in contact with one circle
tooth. Turn adjusting screws of front guide as necessary
to provide 0,76 mm between the opposite flanks of the
circle and pinion tooth. Notice that during the adjustment
of the teeth backlash, the wear plate of the front guide
must rest on the inner race of the circle.
Circle upper surface
Vertical clearance
max. 1,52 mm
Circle