Service Manual

Power Shaft Disassembly (Fig. 13)
1. Park the machine on a level surface, fully raise the
coring
head and stop the engine. Remove the key from
the ignition switch.
2. Raise lock–up brackets on each side of machine and
lower coring head until it rests on brackets.
3. Unlatch and remove coring head cover.
4. Remove coring head drive belt (see Coring Head
Drive Belt Removal in this section).
5. Remove power shaft assembly from machine.
6. Press bearings from power shaft. Note that right side
bearing
has retaining ring used to locate bearing in cor-
ing frame.
7. Measure and record distance from shaft end to loca-
tion of taper lock bushing to ease reassembly
.
8. Loosen pulley (item 34) from taper lock bushing
(item 32):
A. Remove three (3) cap screws (item 21) and lock
washers (item 20) that secure pulley to taper
lock
bushing.
IMPORTANT: Excessive or unequal pressure on the
cap screws can break the taper lock bushing flange.
When removing taper lock bushing, tighten screws
progressively
and evenly.
B. Insert cap screws into threaded removal holes of
t
he bushing. Tighten screws progressively and even-
ly until the pulley is loose on the bushing.
9. Loosen set screw (item 33) that secures taper lock
bushing to power shaft. Remove bushing and pulley
from
the shaft. Locate and retrieve key (item 31) that lo-
cate bushing on shaft.
Power Shaft Assembly (Fig. 13)
NOTE: Power shaft is not symmetrical. Keyway in shaft
is closer to right side of machine.
1. Install key (item 31) into keyway in power shaft.
2. Using measurement made during disassembly, lo-
cate taper lock bushing on shaft and secure in place with
set screw (item 33).
3. Position pulley to bushing making sure that tapered
surfaces of pulley and bushing align. Align threaded
holes of pulley with non–threaded holes of bushing.
IMPORTANT: When securing pulley to taper lock
bushing,
tighten cap screws progressively and
evenly to prevent bushing flange damage.
4. Secure pulley to taper lock bushing with three (3) cap
screws (item 21) and lock washers (item 20). T
ighten
cap screws to a torque from 160 to 200 in–lb (18.1 to
22.6 N–m) in three equal steps and in a circular pattern.
5. Install bearings on power shaft. Make sure that right
side bearing has retaining ring toward the middle of the
shaft.
6. Position power shaft assembly into coring head
frame.
7. Install coring head drive belt (see Coring Head Drive
Belt
Installation in this section). During assembly, make
sure to check belt alignment. If necessary, loosen set
screw on taper lock bushing and adjust location of pulley
on power shaft. Re–tighten set screw when alignment is
correct.
Belt Tensioner Disassembly (Fig. 13)
CAUTION
Be careful when removing extension springs on
idler assembly. The springs are under heavy load
and may cause personal injury.
1. Disassemble belt tensioner components as required
using Figure 13 as a guide.
Belt Tensioner Assembly (Fig. 13)
1. Assemble belt tensioner components as required
using Figure 13 as a guide noting the following:
A. When installing the idler pulley (item 47), position
short spacer (item 18) on the hub side of the pulley
.
B. Liberally apply antisieze lubricant to the shaft of
cap screw (item 9) before installation of the cap
screw into the idler brackets and idler pulley
.
C. Make sure that idler brackets (items 38 and 40)
pivot freely after tightening the lock nut (item 14) that
secures idler pulley (item 47).
D. If bearings were removed from idler pulley (item
44), install one retaining ring, press bearings into
pulley and then install second retaining ring.
E. Coat idler shaft (item 42) with antisieze lubricant
before installation.
2. After assembly of belt tensioner components, make
sure to check belt alignment. If necessary
, loosen fas-
teners that secure idler pivot pulley bracket (item 6) and
adjust location of bracket on coring head frame.
Coring Head
Greens Aerator Page 8 – 15 Coring Head