Troy-Bilt 7 HP Technical Manual page 21

SECTION 5: PTO Power Unit Transmission
PTO HORSE MODEL
TECHNICAL MANUAL
Page 5-3 4/90
PTa Power Unit
Drive Shaft
These instructions describe how
to service the PTO power unit
drive shaft. Before you can per-
form these instructions you must
first remove the PTO power unit
housing cover. See "PTO Power
Unit Housing Cover" in this sec-
tion for removal instructions.
Use Figure 5-2 as a reference
for part locations in these
instructions.
Note: Either of two basic types of
drive shafts may have been in-
stalled at the factory: an integral
worm design (worm is machined
directly from the shaft material), or
a welded worm design (the worm is
welded to the shaft and can be
identified by blue welds at either
end of the worm). Each design
has its own part number and
requires specific related parts.
Before installing a new drive shaft
or related drive shaft parts, first
determine which type of shaft you
are working with. See the tiller
parts catalog for parts ordering
information.
Removal
1. Remove the bolt (1) that holds
the Tines/PTO Clutch Lever (2) to
the clutch lever eccentric shaft (3).
Then remove the lever from the
shaft.
2. Loosen the hex nut/bushing
(6) on the Tines/PTO Clutch Lever
shaft and remove the remainder of
the Tines/PTO Clutch Lever
assembly (6-9). Observe the part
of the lever (9) that engages the
dog clutch (5). If it is excessively
worn or damaged, or if the cus-
tomer has had difficulty engag-
ing the tiller attachment, replace
the part with a newer-style socket
head screw that is included with a
complete conversion kit (part No.
19
Figure 5-2: PTO Power Unit Drive Shaft.
10353). Refer to "Installing a New
Tines/PTO Clutch Lever Assem-
bly" in Section 7 of this manual.
3. Use snap ring pliers to remove
the (external) snap ring (4) that
retains the dog clutch (5) to the
drive shaft (17). You will have
to push in the dog clutch (5) to
gain access to the snap ring.
4. Remove the dog clutch using
a pair of needle nose pliers. Also
make sure you retrieve the drive
shaft key (10).
5. Remove the bolt (23) and con-
cave washer (24) that hold the
transmission pulley (25) to the
drive shaft.
6. Remove the pulley and the
drive shaft key (26). On welded
drive shafts, remove the shoulder
washer (27).
7. Remove the bolts (12) and
lockwashers (13) that hold the
front bearing cap (14).
8. Remove the front bearing cap.
9. Use an arbor press to remove
the oil seal (15) from the front
bearing cap.
10. Remove and discard the
gasket (16) from the front bearing
cap.
11. Pull the drive shaft (17) for-
ward slightly just enough to dis-
lodge the shims (18). Remove the
shims.
12. Remove the front bearing
cup (20) from the housing.
Note: Keep each bearing cup
paired with its bearing if you
intend to reuse them. Each bear-
ing cup wears differently accord-
ing to its bearing.
13. Remove the drive shaft
through the front of the transmis-
sion housing.
14. Insert a long bar in through
the front of the transmission hous-
ing to knock out the rear oil seal
(11). Be careful to not damage the
inside of the housing, the bearing
cup (20), or the retaining ring (21).
15. Put your hand down through
the top of the housing and remove
the rear bearing cup (20). If you