CLAUSING 5910 Series - Shear Pin and Spindle Bearing Adjustments

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5910
REPLACING SHEAR PIN IN LEAD SCREW
Shear pin, located at gear box end of lead screw
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protects lead screw and gear box against overload.
To replace broken shear pin:
Figure 18
A
B
1. Remove two socket cap screws (A, fig. 18) from
lead screw bracket (B). Remove bracket from lead
screw (D) and clutch rod (C).
2. Engage half-nuts, turn carriage handwheel toward
t ailstock, pulling lead screw from gear box shaft .
Disengage half-nuts and remove lead screw.
Figure 19
3. Remove sheared pin (A, fig . 19) from gear box
shaft a nd lead screw.
4. Slide lead screw over gear box: shaft - - check
alignment of shear pin holes with punch -- turn-
ing lead screw 180° if necessary • - and install
new shear pin with retainer.
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5. Replace lead screw bracket • • CAUTION: Do not
tighten the two socket cap screws.
6. Move carriage to cailscock end of bed , engage half-
nuts co align lead screw and clutch rod, then
tighten the two socker cap screws.
ADJUSTING SPINDLE BEARINGS
Spindle bearings have been preloaded at factory and
seldom require adjusting. Follow t hese instructions
should adjustment be necessary:
I. Make adjustment onl y wh en spindle is at operating
temperature - • run sp i ndle at medium speed for
one hour with 6
11
driving plate mounted on spindle.
2. Disengage back gear pin from dri ve pulley by pull·
ing pin away from headstock.
3. Turn back gear knob to the right.
4. Move lead screw direction knob to v er t i c a 1
( NEUTRAL) position .
5. Give driving place a sharp spin with , your hand.
NOTE: If preload is correct - - drive place shoul d
rotate about one turn.
To adjust:
1. Remove spindle handwheel and upper belt guard.
Figure 20
2. Loo se n sec s~rew (B) (fig. 20) in be aring adjusting
nut (A) and tighten nut with spanner wrench until
spindle end play h as been r em o ve d.
3, Give driving plate a sharp spin with y our hand - -
drive plate should rotate about one turn. If it
doesn't, adjust nut (A) and recheck.
4. Tighten sec screw (B) in adjusting nut.
5. Repla ce guard and handwheel.