Toro ProCore SR Series Service Manual page 81

6. If necessary, remove sprocket(s) from gearbox shaft
(see Coring Head Drive Sprockets Disassembly in this
section).
7. If sprocket removal from coring crankshaft is neces-
sary, remove coring crankshaft bearing housing that in-
cludes sprocket and remove sprocket from crank arm
(see Coring Crankshaft Bearing Housing Removal in
this section).
8. If necessary, remove idler assembly using Figure 16
as a guide.
Assembly (Fig. 16)
1. If coring crankshaft sprocket was removed, secure
sprocket to crank arm and install coring crankshaft bear-
ing housing (see Coring Crankshaft Bearing Housing
Installation in this section).
2. If sprockets were removed from gearbox shaft,
install sprockets to gearbox shaft (see Coring Head
Drive Sprockets Assembly in this section).
3. If idler assembly parts were removed from frame,
install idler components using Figure 16 as a guide.
Make sure that flat on head of idler shaft (item 1) is posi-
tioned toward location of adjustment bolt (item 16). Do
not fully tighten grooved jam nut (item 3) at this time.
4. Using a suitable straight edge, check that alignment
between gearbox, coring crankshaft and idler sprockets
is correct. If needed, readjust sprocket location on gear-
box shaft to align sprockets.
IMPORTANT: When installing drive chains, install
and properly tension one of the drive chains. Then,
install and tension the second chain.
5. If both drive chains were removed, install first drive
chain:
A. Position drive chain to gearbox sprocket, pull up-
per run of chain tight and align with coring crankshaft
sprocket teeth. If necessary, slightly rotate coring
crankshaft so that chain remains tight when aligned
with sprocket teeth. Route chain over idler sprocket
and back to gearbox sprocket (Fig. 17). Do not allow
upper run of chain to have excessive slack.
B. Apply grease to master link O--rings. Place two
(2) O--rings on master link pins and install into ends
of drive chain. Place final two (2) O--rings on master
link pins and install side plate.
C. Install master link clip so that the closed end is
facing the direction of chain rotation.
ProCore SR Series
IMPORTANT: To prevent gearbox damage, do
not overtighten drive chains. Drive chains
should have 1/2" (12.7 mm) total deflection when
properly adjusted.
D. Adjust idler sprocket location with bolt (item 16)
so that chain has 1/2" (12.7 mm) total deflection at
mid--span between sprockets. Make sure that jam
nut (item 3) and bolt (item 16) are fully tightened after
chain adjustment is completed.
6. Block crankshaft to prevent it from rotating. Install
and adjust second drive chain using procedure listed in
step 5 above.
7. After assembly, rotate coring crankshaft by hand to
make sure that no binding occurs.
8. Lower and secure rear hood.
4
1. Drive chain
2. Bolt
3. Hex nut
Page 5 - - 19
1
3
6
2
Figure 17
4. Gearbox
5. Crankshaft sprocket
6. Idler sprocket
Coring Head (SR48 & SR72)
5