Toro ProCore SR Series Service Manual page 83

Disassembly (Fig. 18)
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. Raise and support rear hood.
3. Remove front screens (see Covers Removal in the
Service and Repairs section of Chapter 3 -- Chassis).
4. Remove drive chains (see Coring Head Drive Chain
Disassembly in this section).
5. Remove sprocket(s) from gearbox shaft:
A. Measure distance from end of gearbox output
shaft to location of sprocket hub for assembly pur-
poses. Record measurement.
B. Remove six (6) cap screws (items 24 and 25) and
lock washers (item 14) that secure sprocket to
sprocket hub.
IMPORTANT: Excessive or unequal pressure on
the cap screws can break the sprocket hub
flange. When removing sprocket from hub, tight-
en screws progressively and evenly.
C. Insert three (3) cap screws into threaded removal
holes of the sprocket hub. Tighten screws progres-
sively and evenly until the sprocket is loose on the
hub. Position sprocket away from hub.
D. Remove set screw that secures sprocket hub to
gearbox shaft.
E. Remove hub, sprocket and square key from
gearbox shaft.
6. 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).
Assembly (Fig. 18)
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. Install sprockets to gearbox shaft:
A. Make sure that tapered surfaces of sprocket and
sprocket hub are thoroughly clean (no oil, grease,
dirt, rust, etc.).
B. Position square key in gearbox shaft slot. Apply
antiseize lubricant to bore of sprocket hub.
ProCore SR Series
C. Slide sprocket and hub onto gearbox shaft mak-
ing sure that tapered surfaces of sprocket and hub
align.
D. Position hub location from end of gearbox shaft
as measured before removal. Secure hub to gearbox
shaft with set screw.
IMPORTANT: When
sprocket hub, tighten cap screws in three (3)
equal steps and in a circular pattern to prevent
hub flange damage.
E. Align threaded holes of sprocket with non--
threaded holes of sprocket hub and install three (3)
cap screws (item 24) with lock washers (item 14).
Tighten cap screws in three (3) equal steps and in a
circular pattern to secure sprocket and sprocket hub.
F. Install and tighten three cap screws (item 25) with
lock washers (item 14). Tighten cap screws in three
(3) equal steps and in a circular pattern
3. 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.
4. Install and tension drive chains (see Coring Head
Drive Chain Assembly in this section).
5. After assembly, rotate coring crankshaft by hand to
make sure that no binding occurs.
6. Install front screens to machine (see Covers Installa-
tion in the Service and Repairs section of Chapter 3 --
Chassis).
7. Lower and secure rear hood.
4
1. Drive chain
2. Bolt
3. Hex nut
Page 5 - - 21
securing sprocket
1
3
6
2
Figure 19
4. Gearbox
5. Crankshaft sprocket
6. Idler sprocket
Coring Head (SR48 & SR72)
and
5