Toro ProCore SR Series Service Manual page 73

Removal (Fig. 9)
1. Position aerator on a firm, level surface. If aerator is
attached to tractor, disengage PTO, apply tractor park-
ing brake, stop engine and remove key from the ignition
switch.
2. Unlatch, open and support rear hood to allow access
to coring crankshaft.
3. Rotate coring crankshaft to allow access to crank pin
(item 15) and hex nut (item 8) for connecting rod that is
to be removed.
4. Insert block of wood between aerator frame and con-
necting rod to prevent the crankshaft from turning. Using
crankshaft nut wrench (see Special Tools), loosen, but
do not remove, hex nut (item 8).
5. Remove linkage arm from one side of connecting rod
(see Disassembly of Linkage Arm Assemblies in this
section).
6. 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 crank pin head orientation for proper assem-
bly.
7. For connecting rod that is to be removed, remove
hex nut (item 8), clipped washer (item 9) and crank pin
(item 15) that secure upper end of connecting rod to cor-
ing crank arms.
8. Remove connecting rod from aerator. Locate and re-
trieve outer bushings (item 5) from small end of connect-
ing rod.
9. If necessary, remove ball bearings, bearing spacer
and retaining rings from connecting rod. Discard re-
moved bearings.
Installation (Fig. 9)
1. If bearings were removed from upper bore of con-
necting rod, install new bearings into upper bore.
A. Install retaining rings into grooves in upper bore
of rod. Make sure that retaining rings are properly
seated in grooves.
ProCore SR Series
B. Insert bearing spacer into rod bore.
C. Press ball bearings into connecting rod bore until
the bearings contact installed retaining rings.
2. If bearings were removed from lower bore of con-
necting rod, install new bearings into lower bore.
A. Install two (2) retaining rings into the grooves in
lower bore of rod. Make sure that retaining rings are
properly seated in grooves.
B. Press a new bearing into one side of the connect-
ing rod bore until the bearing contacts installed re-
taining ring. Then press second new bearing into
bore so that it contacts first bearing.
C. Insert bearing spacer into lower rod bore.
D. Press final two (2) new bearings into housing fol-
lowing above procedure. Make sure that bearing
spacer is centered in rod bore.
3. Apply antiseize lubricant to crank pin (item 15) and
wrist pin (item 16).
NOTE: When installing connecting rod onto wrist pin,
use bullet tool SG255002 (see Special Tools in this
chapter) to prevent wrist pin thread damage.
4. Place outer bushings (item 5) to small end of con-
necting rod. Slide lower end of connecting rod onto wrist
pin.
NOTE: When installing crank pin (item 15), use bullet
tool SG255000 (see Special Tools in this chapter) to pre-
vent thread damage to crank pin.
5. Position connecting rod to crank arms. Insert crank
pin (item 15) through crank arms and upper connecting
rod bearings.
6. Slide clipped washer (item 9) onto crank pin (item 15)
and align washer flat with step in crank arm. Thread hex
nut (item 8) onto crank pin.
7. Install removed linkage arm to side of connecting rod
(see Assembly of Linkage Arm Assemblies in this sec-
tion).
8. Properly torque fasteners:
A. Torque flange nuts (item 7) that secure linkage
arm to 300 ft- -lb (407 N- -m).
B. Torque hex nut (item 8) on crank pin to 950 ft- -lb
(1288 N- -m).
9. After assembly, rotate coring crankshaft by hand to
make sure that no binding occurs.
10.Lower and secure rear hood.
Page 5 - - 11 Coring Head (SR48 & SR72)