Toro 20330 Service Manual - Page 20

General, Internally Clutched - engine

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WORM DRIVE TRANSMISSION GENERAL There are two versions of the worm drive transmission. The first is a clutch type and is used on 21" front wheel drive mowers. The second version is constant mesh and is used on International 48cm rear wheel drive mowers. INTERNALLY CLUTCHED Description This is a worm and helical gear transmission. The worm shaft (input shaft) is driven by a belt from the engine crankshaft. A spring which hooks into the tab on the front of the transmission (where the roll pin is) and to the mower housing, pivots the transmission forward to maintain tension on the belt. The worm is in constant mesh with the helical gear. The clutching action is provided by a sliding clutch jaw. A shift fork moves the clutch jaw to engage and disengage the transmission. When the clutch jaw engages the helical gear, power is transferred from the clutch jaw to the sleeve inside the clutch jaw. The sleeve is pinned to the axle. The axle then begins to rotate (Fig. 001). A. Belt B. Spring C. Helical Gear D. Clutch Jaw E. Shift Fork F. Sleeve G. Input Shaft (worm shaft) A B E CDF G 1-2 Fig 001 fig 1 WPM Drive Systems Manual

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1-2
WPM Drive Systems Manual
WORM DRIVE TRANSMISSION
GENERAL
There are two versions of the worm drive transmission.
The first is a clutch type and is used on 21” front wheel
drive mowers. The second version is constant mesh and
is used on International 48cm rear wheel drive mowers.
This is a worm and helical gear transmission. The worm
shaft (input shaft) is driven by a belt from the engine
crankshaft. A spring which hooks into the tab on the
front of the transmission (where the roll pin is) and to
Fig 001
fig 1
INTERNALLY CLUTCHED
Description
the mower housing, pivots the transmission forward to
maintain tension on the belt.
The worm is in constant mesh with the helical gear. The
clutching action is provided by a sliding clutch jaw. A shift
fork moves the clutch jaw to engage and disengage the
transmission. When the clutch jaw engages the helical
gear, power is transferred from the clutch jaw to the
sleeve inside the clutch jaw. The sleeve is pinned to the
axle. The axle then begins to rotate (Fig. 001).
A. Belt
E. Shift Fork
B. Spring
F.
Sleeve
C. Helical Gear
G. Input Shaft
D. Clutch Jaw
(worm shaft)
A
B
E
G
C
D
F