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ProCore 648Page 7 – 14Coring Head
Coring Head Drive Jackshaft
1. Primary pulley
2. Taper lock bushing
3. Lock washer
4. Cap screw
5. Set screw
6. Woodruff key
7. Jackshaft
8. Cap screw (2 used per bearing)
9. Flange mount bearing
10. Plug
11. Set screw
12. Lock nut (2 used per bearing)
13. Secondary pulley
14. Secondary drive belt
15. Coring crankshaft
Figure 17
2
3
4
6
8
10
1
5
2
3
4
7
9
8
11
5
13
15
12
FRONT
RIGHT
10
9
11
6
12
14
Removal (Fig. 17)
1. Park machine on a level surface, fully raise coring
head, engage parking brake, stop engine and remove
key from the ignition switch. Secure coring head with
service latch.
2. Remove belt cover and rear hood from machine (see
Operator’s Manual).
3. Remove primary and secondary drive belts from
jackshaft pulleys (see Primary Drive Belt Removal and
Secondary Drive Belt Removal in this section).
4. Loosen cap screws and lock nuts that secure flange
mount bearings to machine frame. Support jackshaft as-
sembly, remove loosened cap screws and lock nuts and
remove jackshaft assembly from machine.
5. Loosen taper lock bushings (Fig. 18):
A. Remove three (3) cap screws and lockwashers
that secure taper lock bushing to pulley.
IMPORTANT: Excessive or unequal pressure on the
cap screws can break the taper lock bushing flange.
When removing taper lock bushing, tighten screws
progressively and evenly.
B. Insert cap screws into threaded removal holes of
the bushing. Tighten screws progressively and even-
ly until the pulley is loose on the bushing.
6. Loosen set screws (item 5) that secure taper lock
bushings to jackshaft. Remove bushings and pulleys
from the jackshaft. Locate and retrieve woodruff keys
(item 6) that locate bushings on jackshaft.