CLAUSING 5910 Series - Replacing Timing Belt

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5910
18. Hold variable control against low speed stop for
30 seconds , then turn through entire range.
19. Check adjustment of variable drive belt - - refer
to ADJUSTING VARIABLE DRIVE BELT.
20. Replace belt guards and front cover.
ADJUSTING VARIABLE DRIVE BELT
With motor on, turn variable control dial to HIGHEST
SPEED - - use a tachometer to check spindle speed.
If tachometer doesn't register approximately 2000 rpm:
F i gure 24
I. Holding variable pulley (F fig. 24) so it will not
rotate, turn ·lock nut (H)- clockwise if speed is
too low, counter-clockwise if speed is to high.
If ~achometer is not available: Belt should be flush
with out side of motor pulley at high speed and flush
with outside of countershaft pulley at low speed.
Motor base brackets are bolted and doweled for per-
manent alignment.
REPLACING TIMING BELT
I. With lathe running, turn variable dial to · highest
speed - -· 2000 rpm in open belt or 280 rpm in back
gear . Then turn off motor.
2. Remove spindle handwheel (B) (fig. 21), belt
guards and front cover .
3. Turn variable dial back to lowest speed and lock
dial in place with pin (A).
4. Pull on outer sheave of lower variable motor pulley
(F) (fig. 24) until variable belt (E) is loose.
5. Thru front cover opening, remove 5/16" - 18 hex
cap screw (F) (fig . 23) and spacer from clutch
linkage.
6. Remove four hex nuts (D) (fig. 24). Raise counter-
shaft (C) slightly and slip timing belt (B) off
spindle pulley (A). Lower countershaft and slip
variable belt (E) off variable motor pulley (F).
7. Place countershaft on bench.
8. Remove bearing caps ( D) (fig. 23), snap rings and
countershaft spindle (E) from bracket (C).
9. Remove timing belt from countershaft pulley (G).
10. Place new timing belt on countershaft pulley (G).
11. Install spindle in countershaft bracket and secure
in place with snap rings and bearing caps (D).
IMPORT ANT: Make sure variable belt is in place
before installing bearing caps.
12. Position the countershaft (C) (fig. 24) so variable
belr (E) can be slipped on motor pulley (F),
then raise countershaft so timing belt (B) can be
slipped on spindle pulley (A).
13. Place countershaft assembly on the four mounting
studs (D), then snug up the four hex nuts. Refer
to Tensioning Timing Belt Steps 2-5.
14. Thru front cover opening, install 5/ 16" - 18 hex
cap screw and spacer in clutch linkage .
15. Remove lock pin (A, fig. 21) from variable cam
housing.
16, Start lathe motor.
17 • Hold variable control againsr low speed stop for
30 seconds , then tum through entire range.
18. Replace belt guards and front cover.
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