Troy-Bilt 34061 Owner's Manual page 25

WARNING
Before inspecting, cleaning or servicing the machine, shut off engine, wait for all moving parts to
come to a complete stop, disconnect spark plug wire and move wire away from spark plug. Remove
the key from the keyswitch on units so equipped.
Failure to follow these instructions can result in serious personal injury or property damage.
L
E
N
E
D
C
B
F
A
Fig. 5-16
1. Remove the six 5/16"-18 x 3/4" hex
head cap screws securing fender. Remove
fender.
2. Remove the cutter bar drive belt (see
instructions in this Section).
3. Rotate the drive mechanism by hand
and watch for any noticeable play between
the parts. Worn and loose parts can cause
early parts failure.
CHECKING ECCENTRIC SHAFT
BEARINGS
Check shaft bearings (E, Fig. 5-16) when-
ever the eccentric radial bearing (B) is
replaced. The shaft bearings do not need
replacement as often as the eccentric
radial bearing.
1. Check the eccentric shaft bearings (E,
Fig. 5-16) for play. Move the eccentric shaft
(C) up and down and from side to side.
2. Check for play in the eccentric arm
pivot bearings (D, Fig. 5-16 & 5-18) by
moving the eccentric arm (E, Fig. 5-18)
back and forth.
H
J
C
K
B
A
M
Fig. 5-17
E
Fig. 5-18
3. Wear and looseness can be caused by
loose bearing flange bolts (F, Fig. 5-18).
Tighten and re-check all bolts before
replacing bearings.
ECCENTRIC SHAFT BEARINGS
REMOVAL/REPLACEMENT
The procedure for removing and replacing
the eccentric shaft bearings (E, Fig. 5-16)
requires special tools and a high degree of
mechanical aptitude. Contact the factory
Technical Service Department before
attempting this repair (or have the unit
serviced by your authorized dealer).
NOTE: Raise and support the unit from
underneath.
Section 5: Maintenance
To Remove the Eccentric Shaft Bearings:
1. Clamp the eccentric housing (M, Fig.
5-16) in an arbor press with the top end of
the eccentric shaft facing up. Press the
shaft (C) through the eccentric shaft bear-
ings (E). Use a short length of 3/4" round
bar stock to press the eccentric shaft com-
pletely through the bearings.
D
2. Press out the upper bearing in the
housing (M) and discard. Remove and
E
save the spacer (N).
3. Remove the lower bearing from the
eccentric shaft (C) with a bearing puller.
4. Inspect all parts for wear or damage,
clean parts thoroughly and replace any
F
worn or damaged parts.
To Replace the Eccentric Shaft Bearings:
Using the 3/4" round bar stock, press new
bearings onto the eccentric shaft and into
the housing.
NOTES:
• Never press or pound directly on the
bearing race when installing the bearing
F
C
in the eccentric housing. Use a pipe with
an outer diameter slightly smaller than
the opening in the housing.
• Never press or pound directly on the
B
bearing race when installing the bearing
on the eccentric shaft– use a pipe with
an inner diameter slightly larger than the
shaft diameter to press on the bearing.
D
• Clean the opening in the eccentric
housing. Remove foreign material which
could prevent bearings from seating
squarely in the housing. Lubricate all
surfaces of press-fit parts.
When installing the engine deck
assembly, the front housing assembly,
or the housing assembly, the flange
screws (A, B, and C, Fig. 5-19) must be
tightened in the proper sequence to
avoid damage.
25
CAUTION