Inspection; Eccentric Shaft Assembly; Removal; Installation - Troy-Bilt 7 HP Technical Manual

PTO HORSE MODEL
TECHNICAL MANUAL
Page 5-10 4/90
SECTION 5: PTO Power Unit Transmission
check for burrs or rough edges
either on the key or in the keyway.
• Make sure there are no burrs
or rough edges in the bore open-
ing of the slow speed gear (9).
• Using a spray lubricant, lubri-
cate the clutch where the shaft
and pins will fit.
2. Insert the three clutch guide
pins (11) into the clutch. If a guide
pin binds, discard it and use a
new one.
3. Assemble the fast gear, clutch,
and slow gear; the gear hubs
face out.
4. Insert a piece of wood
between the eccentric lever (12)
and the housing to relieve the
pressure of the eccentric shaft (15)
on the clutch as you are install-
ing it.
5. Gently place the gear and
clutch assembly into the housing •
so that the eccentric pin (16) fits
into the groove an the clutch.
Make sure the smaller (fast speed)
gear is on the right side.
6. Look through the wheel shaft
opening and line up the keyways
on the fast speed gear and clutch.
7. Insert the wheel shaft through
the right side and slip it through
the gears and clutch.
8. Remove the piece of wood
from the eccentric lever and check
to make sure the eccentric shaft
can move freely from side to side.
9. Using #30 weight oil, lubricate
the bronze bushings (8, 13).
10. Making sure the oil pick-up
grooves are facing in, use a
hammer to insert a bronze bush-
ing (8 or 13) about 1/8 of the \Nay
in the housing.
11. Using a rubber hammer and
driver, and making sure the oil
pick-up grooves are facing in,
install the other bronze bushing
(8 or 13) so that the edge of the
bushing is flush with the edge of
the counterbore in the transmis-
sion housing. Then finish instal-
ling the other bushing in a similar
manner.
12. Use a rubber hammer to
strike down on the wheel shaft on
both sides of the housing. This will
loosen the shaft and make it easy
to turn.
13. On the left or right side (it
doesn't matter which side), insert
a .062" wheel shaft shim (3, 7) and
then install a snap ring (2, 6).
Gently tap this end of the shaft
inward so that the snap ring is
flush against the bushing.
Note:
The snap ring has two
sides: a flat side and a rounded
side. Make sure the flat side is
against the outside edge of the
groove.
14. Go to the other side of the
housing and shim (3, 7) the gap
between the bushing and the snap
ring groove.
15. Install the snap ring (6) after
you shim the wheel shaft.
"
,.
16. Using a rubber hammer, tap
down on both ends of the wheel
shaft. Then check for end play.
There should be between .005"
and .015" play in the shaft. Add or
remove shims as needed.
17. Turn the wheel shaft with
your hand; it should spin freely.
Also, there should be no vertical
or diagonal play. Vertical or diag-
onal play indicates a worn bronze
bushing.
18. Apply a layer of non-
hardening gasket sealer to the
outside edges of the two oil seals
(1) and install them at each end of
the wheel shaft. Each seal should
be flush with the edge of the
transmission housing.
Eccentric Shaft
Assembly
These instructions describe how
to service the eccentric shaft
assembly. Before you can remove
the eccentric shaft you must first
remove the wheel shaft. See the
wheel shaft removal instructions in
this section.
Use Figure 5-8 as a reference for
part locations in these instructions.
Removal
1. Remove the wheel speed shift-
ing pin (1) from the eccentric shaft.
2. Turn the housing upside
down. Use a 5/32-inch drift to
remove the spirol roll pin (2) that
retains the eccentric lever (4) to
the eccentric shaft (3).
3. From the outside of the hous-
ing, tap the eccentric shaft (3)
inward until you remove the
eccentric lever (4).
4. Continue tapping the eccen-
tric shaft inward until the shaft
drops into the housing.
5. Remove the spring (6) and
washer (7) from the shaft.
6. Remove and discard the eccen-
tric shaft oil seal (5). You can use a
small screwdriver to pry it out.
Inspection
If the seal area on the eccentric
shaft is excessively worn or
scored, discard the eccentric
shaft. Minor scoring can be
removed with an emery cloth.
Installation
Use Figure 5-8 as a reference for
part locations in these instructions.
1. Put the eccentric shaft spring
(6) and washer (7) on the eccen-
tric shaft (3).
2. Insert the eccentric shaft
assembly into the PTO power unit