Toro ProCore SR Series Service Manual page 53

Removal (Fig. 11)
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 Chain 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.
IMPORTANT: When removing crank pin (item 2),
note orientation of crank pin head for proper assem-
bly.
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. Remove the hex nut (item 5) that secures one of
the crank arms (item 6 or 13) to crank shaft (item 11).
D. Slide crank arm from crank shaft.
E. If sprocket is attached to removed crank arm, re-
move sprocket if necessary (Fig. 12).
ProCore SR Series
F. Loosen set screws (item 15) that secure bearing
to crank shaft.
G. Slide crank shaft with attached crank arm from
bearing housing. Note orientation of grooves in
crank shaft for assembly purposes.
H. If necessary, remove retaining rings and bearing
from bearing housing. Note orientation of bearing
flange for assembly purposes. Discard bearing if re-
moved from housing.
I. If removal of the second crank arm is necessary,
make sure that alignment of crank arm to crank shaft
is noted and then remove hex nut (item 5) and sec-
ond crank arm from crank shaft.
7. If necessary, remove and discard spring pins (item
14).
1
1. Sprocket
2. Spacer (4 used)
3. Crank arm
Installation (Fig. 11)
1. If bearing was removed from bearing housing, install
new bearing into housing:
A. Install a retaining ring into one of the grooves in
bearing housing. Make sure that retaining ring is
properly seated in groove.
B. Position bearing to bearing housing so bearing
flange orientation is correct. Install new bearing into
bearing housing by pressing on outer race of bear-
ing.
C. Install second retaining ring into bearing housing
groove to secure bearing. Make sure that retaining
ring is properly seated in groove.
2. If spring pins (item 14) were removed from frame,
drive new spring pins into aerator frame holes.
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4
3
2
Figure 12
4. Lock washer (4 used)
5. Cap screw (4 used)
Coring Head (SR54 & SR70)
5