Toro ProCore SR Series Service Manual page 77

Removal (Fig. 12)
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 back cover to allow ac-
cess to coring crankshaft.
3. If bearing housing with drive chain attached is to be
removed, remove coring head drive chain (see Coring
Head Drive Disassembly 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 crank pins and connecting rods on both
sides of bearing housing that is to be removed (see Con-
necting Rod Removal in this section).
5. Support bearing housing assembly to prevent it from
falling. Remove two (2) cap screws and lock nuts that
secure bearing housing assembly to coring head frame.
Remove bearing housing assembly (with crank arms at-
tached) from machine.
6. Disassemble bearing housing assembly:
IMPORTANT: The crank arms on either side of a
bearing housing are different. Before bearing hous-
ing disassembly, make sure to note location and ori-
entation of crank arms.
A. Note crank arm alignment with each other for as-
sembly purposes. Incorrect alignment of crank arms
will prevent smooth aerator operation and will lead to
aerator damage. If desired, use a marker to make a
diagonal line across the bearing housing and crank
arms for assembly purposes.
B. Secure bearing housing assembly in a vise.
C. Bend locking plate (item 10) away from crank
shaft nut (item 9) that secures one of the crank arms
(item 4 or 13) to crank shaft (item 12). Remove the
crank shaft nut.
D. Slide crank arm from crank shaft. Locate and re-
trieve four (4) dowel pin bullets (item 5) from crank
arm.
ProCore SR Series
E. If sprocket is attached to the removed crank arm,
remove spacer from both sides of bearing housing
(Fig. 13).
F. If sprocket is attached to removed crank arm, re-
move sprocket if necessary (Fig. 14).
G. Loosen set screws that secure bearings to crank
shaft.
H. Slide crank shaft with attached crank arm from
bearing housing.
I. If necessary, remove retaining rings and bearing
from bearing housing (Fig. 15). Note orientation of
bearing flange for assembly purposes. Discard bear-
ing if removed from housing.
J. If removal of the second crank arm is necessary,
make sure that alignment of crank arm to crank shaft
is noted and then remove locking plate, crank shaft
nut and second crank arm from crank shaft.
5
6
1. Crank arm
2. Spacer
3. Bearing housing
3
4
5
1. Sprocket
2. Spacer (4 used)
3. Crank arm
Page 5 - - 15
2
4
3
2
Figure 13
4. Crank shaft
5. Sprocket
6. Crank arm
1
2
Figure 14
4. Lock washer (4 used)
5. Cap screw (4 used)
Coring Head (SR48 & SR72)
1