Service Manual
ProCore 864/1298 Page 4 − 17 Coring Head
Removal (Fig. 12)
1. Position aerator on a firm, level surface. If attached
to tractor, disengage PTO, apply tractor parking brake,
stop engine and remove key from the ignition switch.
2. Remove rear hood.
3. If bearing housing for #1 and #2 stomper arms is to
be removed, remove coring head drive belt (see Coring
Head Drive Belt Removal in this section).
WARNING
As crankshaft components are removed from
machine, the crankshaft will become out of bal-
ance and may rotate quickly, creating pinch
points and potential for personal injury. Be cau-
tious when disassembling the coring crankshaft.
4. Remove stomper arms and couplings on both sides
of bearing housing that is to be removed (see Stomper
Arm Removal in this section).
5. Drive spring pins (item 11) from bearing housing and
coring head frame.
6. Support bearing housing assembly to prevent it from
falling. Remove fasteners that secure bearing housing
assembly to coring head frame. Remove bearing hous-
ing assembly from machine.
7. Disassemble bearing housing assembly:
A. Remove cap screw (item 1) and flat washer (item
2) that fasten crankarms together. Note that cran-
karm journals are positioned 180
o
from each other.
B. Slide crankarms from bearing housing.
C. If necessary, remove bearings and bearing
spacer from bearing housing.
8. If necessary, remove counterweight from driven
pulley (Fig. 15).
Installation (Fig. 12)
1. Install new bearings if they were removed from bear-
ing housing:
A. Install new bearing into one side of housing by
pressing on outer race of bearing.
B. Position bearing spacer into bearing housing.
C. Install second new bearing into housing by press-
ing on outer race of bearing. Make sure that spacer is
centered between bearings.
1. Crankshaft driven pulley
2. #1 crankshaft position
3. #8 crankshaft position
Figure 13
1
2
3
1. Coupling (#3 shown)
2. Iso mount (2 used)
3. Coupling (#2 shown)
4. Cap screw (2 used)
5. Coupling plate
6. Cap screw (4 used)
7. Lock nut (2 used)
8. Washer (2 used)
Figure 14
1
2
3
4
5
6
7
8
150 to 170 ft−lb
(204 to 230 N−m)
70 to 80 ft−lb
(95 to 108 N−m)
4
1. Driven pulley
2. Counterweight
3. Flange head screw
Figure 15
1
2
3
Loctite #242
Coring Head