Clutch System Operation - Toro Workman HDX Auto Service Manual

Clutch System Operation

3
1. Primary clutch
2. Secondary clutch
3. Moveable sheave (primary clutch)
Power is transferred from the engine to the transmission
by a variable clutch system that consists of two (2)
clutches connected by a drive belt. The primary clutch is
mounted to the engine crankshaft and responds to en-
gine speed. The secondary clutch is mounted to the
transmission input shaft and responds to changes in
drive system load.
Workman HDX Auto
8
1
1
Figure 3
4. Stationary sheave (primary clutch)
5. Moveable sheave (secondary clutch)
6. Stationary sheave (secondary clutch)
Page 4 − 5
4
7
LOW ENGINE SPEED
LIGHT LOAD
FULL ENGINE SPEED
DECREASING LOAD
FULL ENGINE SPEED
INCREASING LOAD
7. CVT drive belt
8. Speed limiter assembly
The two (2) clutches work together to automatically up−
shift and back−shift as changes in load and speed occur.
This shifting changes the turning ratio between the pri-
mary and secondary clutches and allows the engine to
operate at optimum efficiency.
5
6
2
2
Drive Train