WORM DRIVE TRANSMISSION
GENERAL
the mower housing, pivots the transmission forward to
maintain tension on the belt.
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.
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).
INTERNALLY CLUTCHED
A. Belt
E. Shift Fork
F. Sleeve
G. Input Shaft
(worm shaft)
Description
B. Spring
C. Helical Gear
D. Clutch Jaw
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
A
B
E
G
C
D F
Fig 001
fig 1
1-2
WPM Drive Systems Manual
| Categories | Lawn Mower Manual, Lawn-Boy Lawn Mower Manuals, Toro Lawn Mower Manual |
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| Language | English |
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| Publisher | toro.com |
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