Service Manual

ProCore 864/1298 Page 4 − 29 Coring Head
Disassembly (Fig. 29)
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 from machine. Adjust coring
head depth to the deepest setting.
3. Remove front cover and pulley shield from machine
(see Cover Removal in the Service and Repairs section
of Chapter 3 − Chassis).
4. Support the aerator to prevent the machine from
moving.
NOTE: The ProCore 1298 uses one (1) compression
spring for each of its dual coring frames. The ProCore
864 uses two (2) compression springs for its single cor-
ing frame.
WARNING
THE CORING HEAD FRAME IS SPRING LOADED!
To prevent possible personal injury, use com-
pression spring tool (see Special Tools) to re-
move compression spring(s) before disassem-
bling the coring head pivot.
5. Use compression spring tool (see Special Tools) to
remove compression spring(s) from coring head frame:
A. Install compression spring tool threaded rod
through holes in each spring cup (item 1), then install
washer and nut on both ends of rod.
B. Tighten upper nut on rod to compress spring
(item 2).
C. With tool compressing the spring, carefully lift
bottom of spring, slide it from coring head frame, low-
er from hitch frame and remove from machine.
D. If working on ProCore 864, repeat for second
compression spring.
6. Make sure that machine is well supported with jack-
stands or blocking.
CAUTION
The ProCore 864 coring head frame assembly
weighs approximately 900 pounds (408 kg). The
ProCore 1298 coring head frame assembly
weighs approximately 675 pounds (306 kg).
Make sure that proper lift or hoist is used to sup-
port coring head frame during repairs.
7. Using suitable lift or hoist, raise coring head slightly
using lifting eyelets on coring crankshaft as lift points
(Fig. 30). Use appropriate jackstands or blocking to sup-
port the coring head to prevent it from shifting.
8. Remove upper link assemblies (item 21) from hitch
frame and coring head frame.
9. Remove fasteners (items 4, 5 and 6) that secure end
of pivot shafts to machine.
10.Carefully slide pivot shafts from H−frame. Locate
and retrieve four (4) thrust washers (item 2) from be-
tween H−frame and machine frame.
11.Remove H−frame from machine.
12.If necessary, remove bushings (item 20) from H−
frame.
1. Bearing housing 2. Lifting eyelet
Figure 30
2
1
Assembly (Fig. 29)
1. If upper links were disassembled, note that link has
a groove on the end that has left hand threads. Install rod
ends equally to make link assembly from 8.170” to
8.230” (208 to 209 mm) long (rod center to rod center)
(Fig. 31). Also, align rod ends before tightening jam
nuts.
2. If bushings were removed from H−frame, press new
bushings into H−frame bores. Bushings should be re-
cessed into the H−frame at least 0.030” (0.8 mm).
IMPORTANT: When installing pivot shafts, make
sure that both sides of H−frame are aligned with
holes in frame before installing pivot shaft.
3. Position H−frame to hitch frame making sure that
thrust washers are placed between H−frame and hitch
frame. Align both sides of H−frame to pivot shaft holes
in hitch frame. Slide pivot shaft through hitch frame and
H−frame. Secure pivot shaft to hitch frame with cap
screw and flange nut.
Coring Head