Toro ProCore SR Series Service Manual page 101

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 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.
IMPORTANT: When loosening crank nut (item 9) DO
NOT use a pipe wrench or other adjustable wrench.
Damage to the crank nut (item 9), crank shaft (item
12) and crank pin (item 7) may occur if adjustable
wrench is used.
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 may be different. Before bearing
housing disassembly, make sure to note location
and orientation of crank arms. Incorrect alignment
of crank arms will prevent smooth aerator operation
and will lead to aerator damage.
A. Note crank arm alignment with each other for as-
sembly purposes. 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 cotter pin (item 3) and crank nut (item 9)
that secure one of the crank arms to crank shaft.
ProCore SR Series
D. Slide crank arm from crank shaft.
E. If sprocket is attached to removed crank arm, re-
move sprocket if necessary (Fig. 12).
F. Slide crank shaft with attached crank arm from
bearing housing assembly.
G. If necessary, remove retaining rings and bearings
from bearing housing (Fig. 13). Discard removed
bearings.
H. If removal of the second crank arm is necessary,
make sure that alignment of crank arm to crank shaft
is noted and then remove cotter pin, crank nut and
second crank arm from crank shaft.
7. If necessary, remove and discard spring pins (item
10).
5
4
1
11
5
1. Sprocket half
2. Spacer (8 used)
3. Crank arm
4. Lock nut (2 used)
5. Cap screw (2 used)
6. Dowel pin
2
1. Bearing housing
2. Retaining ring
Page 6 - - 15
3
2
6
8
7
4
1
Figure 12
7. Crank pin
8. Screw (8 used)
9. Crank nut
10. Cotter pin
11. Crank shaft
1
3
2
Figure 13
3. Bearing
Coring Head (SR75)
10
9