SECTION
11
DRIVE SHAFT AND TUBE
The drive tube and shaft assemblies used on the TC3000,
TC4000
and TC5000 utilize a common shaft. This shaft
is made of steel and is hardened on both ends. For
positive engagement with the clutch and gearbox, a nine
tooth spline is used on both ends.
The drive tubes vary slightly in dimension between the
three straight shaft trimmers, but are similarly
constructed. Each use an aluminum tube that houses
five oil impregnated bushings. These bushings are
positioned approximately every nine inches inside the
shaft. They are supported by rubber grommets that hold
them in place. See Figure 133.
GROMMET
BUSHING
2.3
CM
(9)-
Figure 133
Neither the drive tube nor the drive shaft is serviceable.
If
either is worn to the point where the shaft begins to
vibrate excessively, both should be replaced.
DRIVE
SHAFT
Drive Shaft Removal
1. Remove the locating screw and loosen the two
clamping screws on the cutter head gearbox. See
Figure 134.
Figure 134
2.
Loosen the
two
shield bracket screws closest to
the drive tube, then pull the gearbox and shield
n
assembly
off
the drive tube.
3. Pull the drive shaft from the tube being careful not
to damage the splined end.
4. Inspect the shaft for excessive wear and evidence
of overheating.
If
it appears replacement is
necessary, replace both the shaft and the drive
tube.
Drive Shaft Installation
1. Grease the splined ends of the shaft to ensure that
they are easy to remove
if
future service is
necessary.
Also,
lubricate the smooth portion of
the shaft with motor
oil.
2.
Slide the shaft into the drive tube until
it
engages
the splined clutch shaft and bottoms out. The shaft
should extend approximately
2.5
cm (1 inch) from
the drive tube when
it
is fully seated. See Figure
135.
a
2.5
CM
(1")
Figure 135
3. Remove the locating screw from the gearbox and
slide the gearbox and shield assembly onto the
drive tube.
4. Visually align the locating screw and the hole in the
drive tube, then install and tighten the locating
screw.
5.
Tighten the two gearbox clamping screws and the
shield bracket screws to secure the assembly.
DRIVE TUBE
Drive Tube Removal
1. Remove the engine as described under Engine
Removal from Drive Tube, page
40.
56
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