Theory Of Operation; Traction Drive System Operation - Sabre 1338 Gear Technical Manual

GEAR POWER TRAIN

THEORY OF OPERATION

TRACTION DRIVE SYSTEM
OPERATION
H
A. Clutch Pedal
B. Engine Drive Sheave
C. Tensioning Spring
D. Clutch Shaft
Function:
The belt traction drive transfers power from the engine
to the 5-speed transaxle. The clutch pedal controls the
belt traction drive, and allows the transaxle to be
shifted through it's five speed range.
With engine running and clutch engaged (clutch pedal
(A) released), the engine drive sheave (B) pulls the
drive belt and transmits power to the transaxle drive
sheave (H). As clutch/brake pedal (A) is depressed by
the operator, clutch shaft (D) pulls the clutch actuating
spring assembly (G) forward. Initial movement of the
pedal compresses the spring in the actuating spring
assembly (G) and, once compressed, pivots the
bellcrank assembly (F). As the bellcrank assembly
pivots, the tensioning sheave (E) moves rearward,
releasing drive belt tension. This allows the engine
5 - 10
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E
F
G
drive sheave to rotate without transferring any power
through the slackened drive belt.
As the bellcrank pivots rearward, belt tensioning spring
(C) is stretched, building additional tension in the
spring. As the operator begins to ease-up on the
clutch/brake pedal (A), tensioning spring (C) pulls the
bellcrank tensioning sheave (E) into the drive belt,
causing the belt to tighten and seat in the grooves of
the transaxle drive sheave (H) and the engine drive
sheave (B). This interaction of components results in
turning the transaxle drive sheave rapidly in a
clockwise direction, transferring power from the engine
to the 5-speed transaxle.
THEORY OF OPERATION
A
D C
E. Tensioning Sheave
F. Bellcrank Assembly
G. Actuating Spring Assembly
H. Transaxle Drive Sheave
B
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