Drivetrain CT Repair
wc_tx000554gb.fm 106
8.12 Gearbox Disassembly
See Graphic: wc_gr003157 and wc_gr003366
There are two very similar gearboxes used on CT trowels. Early
versions used a cup-and-cone–style brake (a), later versions a disc-
type brake (b). Any differences in the procedures to rebuild the
gearboxes are called out.
The following procedures require a hydraulic press and medium-sized
and small-sized hammer-type gear pullers.
8.12.1 Remove the gearbox (5) as described in section Replacing the
Gearbox.
8.12.2 Remove the drain plug (39) and allow the oil to drain out. Open or
remove the pressure relief valve (38) to facilitate draining.
Note: In the interests of environmental protection, place a plastic sheet
and a container under the machine to collect any liquid which drains
off. Dispose of this liquid in accordance with environmental protection
legislation.
8.12.3 Remove the screws (54) from the top cover (6) and remove the top
cover. Inspect the O-ring (89) and the shims (91, 92); replace them if
worn or damaged. Using a hammer-type gear puller (c), pull the
bearing race (d) from the top cover.
8.12.4 Lift the output shaft assembly (e) from the gearbox.
8.12.5 Using a hydraulic press, press the worm gear (18) and the lower roller
bearing (29a) from the output shaft (19).
Note: There is a retaining ring (87) mounted to the output shaft that
secures the position of the worm gear. It is hidden from view when the
worm gear and the roller bearings are mounted to the output shaft. Be
sure to press the worm gear and the lower roller bearing off along the
length of the output shaft to prevent contact with the retaining ring.
8.12.6 Using a hydraulic press, press the upper roller bearing (29b) from the
output shaft.
8.12.7 Remove the retaining ring (87).
8.12.8 Remove the seal (33) from the gearbox.
8.12.9 Using a press, press the bearing race (f)
from the gearbox.
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