TRACTION DRIVE SYSTEM
21
TRANSMISSION INTERNALS
NOTE: the transmission has been broken down to satisfy professional curiosity, this information is not
intended to suggest that the transmission is to be serviced. If you see any of these parts in the course of work-
ing on a 300-series snow thrower, you have done something wrong.
Cone hub clutch
• The Cone hub clutch plates are tapered to fit into the tapper on
the helical gear.
• The clutch plates are engaged to the transmission out put shaft
by 1/8” X 3/4” dowel pin. The dowel pins are position through
holes in the output shaft and the within a key hole in the cone
clutch plate. See Figure 3.33.
Bronze helical gear See Figure 3.34.
• The Helical gear is tapered on each side to allow the clutch
plates to fit into it when the drive is engaged.
• When the transmission is at rest it is in the neutral position.
• When the drive is engaged: a cam lever pulls the cone hub
clutch plates towards each other.
• The bronze gear is driven by the worm gear on the input shaft.
• The clutch plates are tied to the output shaft by pins; when the plates are driven, they turn the output shaft.
• When the drive control is released a wave washer pushes the clutch plates apart and releasing the bronze gear
gear.
NOTE: The internal parts of the transmission are spread out for this picture. This is the only place that these
parts should be viewed, See Figure 3.35.
Figure 3.33
Clutch disc Bronze gear
Wave washer
Figure 3.34
Figure 3.35
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