Service Manual

ProCore SR Series Page 6 -- 11 Coring Head (SR75)
3. Rotate coring crankshaft to allow access to crank pin
(item 15) and crank nut (item 8) for connecting rod to be
removed. Remove cotter pin (item 7) from crank nut.
IMPORTANT: When loosening crank nut (item 8) DO
NOT use a pipe wrench or other adjustable wrench.
Damage to the crank nut (item 8) and crank pin (item
15) may occur if adjustable wrench is used.
4. Insert block of wood between aerator frame and con-
necting rod to prevent the crankshaft from turning. Using
crank shaft nut wrench (see Special Tools), loosen, but
do not remove, crank nut (item 8).
5. Support connecting rod that is to be removed to pre-
vent it from falling.
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.
IMPORTANT: When removing crank pin (item 15),
note head orientation for proper assembly.
6. For connecting rod that is to be removed, remove
crank nut (item 8) and crank pin (item 15) that secure up-
per end of connecting rod to crank arm. Locate and re-
trieve dowel pin (item 2) from each crank arm.
7. For connecting rod that is to be removed, remove
lock nut (item 16) and wrist pin (item 13) that secure low-
er end of connecting rod to coring linkage arms.
8. Remove connecting rod assembly from aerator.
9. As needed, remove outer bushings, retaining rings
and ball bearings from upper and lower bores of con-
necting rod. Discard all removed bearings.
Installation (Fig. 9)
1. If bearings were removed from connecting rod
bore(s), install new bearings into connecting rod.
A. Install one (1) retaining ring into groove in bore of
rod. Make sure that retaining ring is properly seated
in groove.
B. Press a new bearing into the connecting rod bore
until the bearing contacts the installed retaining ring.
C. Press remaining new bearings into bore so that
they contact previously installed bearing.
D. After all bearings have been installed, install sec-
ond retaining ring into groove in connecting rod bore.
Make sure that retaining ring is properly seated in
groove.
2. Apply antiseize lubricant to crank pin (item 15) and
wrist pin (item 13).
3. Place outer bushings (item 9) to small (lower) end of
connecting rod. Position lower end of connecting rod as-
sembly to coring linkage arms.
NOTE: When installing wrist pin (item 13), use bullet
tool SG255001 (see Special Tools in this chapter) to pre-
vent wrist pin thread damage.
4. Slide wrist pin into linkage arms and connecting rod
bearings.
5. Place outer bushings (item 5) to large (upper) end of
connecting rod. Position upper end of connecting rod
assembly to crank arms. Place dowel pins (item 2) in
crank arm bores. Align crank pin (item 15) to dowel pins
and insert crank pin through crank arms and upper con-
necting rod bearings.
6. Thread crank nut (item 8) onto crank pin and lock nut
(item 16) to wrist pin.
IMPORTANT: When tightening crank nut (item 8) DO
NOT use a pipe wrench or other adjustable wrench.
Damage to the crank nut (item 8) and crank pin (item
15) may occur if adjustable wrench is used.
7. Properly torque connecting rod fasteners:
A. Torque lock nuts (item 16) that secure wrist pin to
800 ft--lb (1085 N--m).
B. Torque crank nut (item 8) on crank pin to 1200 ft--
lb (1627 N--m) .
8. After assembly, rotate coring crankshaft by hand to
make sure that no binding occurs.
9. Install cotter pin (item 7).
10.Lower and secure rear hood.
Coring Head
(SR75)