Identifying A Bubbled Wheel Shaft; Testing For A Bubbled Wheel Shaft; Tightening The Castle Nut On The Wheel Speed Lever - Troy-Bilt 7 HP Technical Manual

SECTION 7: Special Repairs and Procedures
PTO HORSE MODEL
TECHNICAL MANUAL
Page 7-4 4/90
Note: If necessary. you can
remove the power unit housing
cover to move the gear and clutch
by hand.
8. Complete the installation of
the wheel shaft. See Section 5 of
this manual for more information.
Identifying
a
Bubbled Wheel
Shaft
A wheel shaft is bubbled when the
metal around the keyway raises or
swells slightly. This weakening of
the metal is due to excessive pres-
sure being exerted by the clutch
on the hi-pro key to turn the
wheels. This is often caused by
improper shifting or by the wheels
striking an object that abruptly
cause them to stop turning.
A bubbled wheel shaft should be
discarded and replaced with a new
one.
Testing for a Bubbled
Wheel Shaft
Disconnect the linkage from the
eccentric lever and work the
eccentric lever by hand. If the
lever is difficult to move the wheel
shaft may be bubbled.
Tightening the
Castle Nut
On
the
Wheel Speed Lever
Follow these instructions to
tighten the castle nut (see Figure
7-3). The castle nut holds the
Wheel Speed Lever on the
transmission.
1. Remove the spring pin from
the castle nut.
2. Tighten the castle nut. When
the castle nut is properly tight-
ened, it should require a force of
13-17 Ibs. to move the Wheel
Speed Lever.
3. Align the nearest slot in the
castle nut with the hole in the
mounting stud. Make sure that the
castle nut is still tight and that the
Wheel Speed Lever moves freely.
4. Install a new spring pin until it
is flush with the top of the slotted
nut.
Figure 7-3: The Castle Nut.