Toro 20330 Service Manual - Page 21

Lubrication, The Shifting Process - ratings

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WORM DRIVE TRANSMISSION Lubrication This transmission requires 90 wt. gear oil. A variable weight such as 85w90 is acceptable as long as the range includes 90 weight. The second part of the requirement is an EP rating of GL 5 or higher. The transmission has a fill/check plug in the front. With the transmission level, fill until level with the hole. NOTE: This is equal to about the center of the axle. Unless the case is cracked, oil can not leak out. Even if a seal fails, oil will leak out only to the bottom of the seal on the axle. If gear failure occurs, the resulting friction can cook the oil down to a smear in the bottom of the case. This does not indicate a lack of lubrication. This type of transmission will last less than 30 minutes with no lubrication. If a transmission lasts even a few weeks in consumer use, it had lubrication to start. The shift rod has a roll pin protruding through the top of the transmission. This pin goes through a latch plate with an L shaped slot in it. The slot guides the pin in its travel from engagement to disengagement. Above the latch plate is a dust filter and a dust cover. The shift arm on top of the transmission holds all these parts in place (Fig. 003). G A B C D E F The Shifting Process The upper end of the clutch fork slides over a groove in a spring loaded rod. This spring pushes the shift fork and clutch jaw towards the engaged position (Fig. 002). A. Roll Pin B. Latch Plate C. Dust Filter D. Dust Cover Fig 003 E. Shift Arm F. Screw G. Shift Rod 3428-0165 B A. Shift Rod When the shift arm is pulled to the rear by the shift cable, the pin moves to the left side of the mower, then A to the rear. This moves the shift pin, the shift fork, and the clutch jaw to the disengage position. NOTE: Dirt packed in the latch plate can prevent disengagement. The dust filter and dust cover help prevent this failure. When the shift cable is engaged, tension on the shift arm is released. The spring on the shift rod applies pressure to the rod, fork, and clutch jaw to engage the transmission. Fig 002 B. Shift Fork 3428-0150 WPM Drive Systems Manual 1-3

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1-3
WPM Drive Systems Manual
This transmission requires 90 wt. gear oil. A variable
weight such as 85w90 is acceptable as long as the
range includes 90 weight. The second part of the
requirement is an EP rating of GL 5 or higher.
The transmission has a fill/check plug in the front. With
the transmission level, fill until level with the hole. NOTE:
This is equal to about the center of the axle.
Unless the case is cracked, oil can not leak out. Even if
a seal fails, oil will leak out only to the bottom of the seal
on the axle.
If gear failure occurs, the resulting friction can cook the
oil down to a smear in the bottom of the case. This does
not indicate a lack of lubrication.
This type of transmission will last less than 30 minutes
with no lubrication. If a transmission lasts even a few
weeks in consumer use, it had lubrication to start.
The shift rod has a roll pin protruding through the top
of the transmission. This pin goes through a latch plate
with an L shaped slot in it. The slot guides the pin in its
travel from engagement to disengagement. Above the
latch plate is a dust filter and a dust cover. The shift arm
on top of the transmission holds all these parts in place
(Fig. 003).
Fig 003
3428-0165
When the shift arm is pulled to the rear by the shift
cable, the pin moves to the left side of the mower, then
to the rear. This moves the shift pin, the shift fork, and
the clutch jaw to the disengage position.
NOTE: Dirt packed in the latch plate can prevent
disengagement. The dust filter and dust
cover help prevent this failure.
When the shift cable is engaged, tension on the shift
arm is released. The spring on the shift rod applies
pressure to the rod, fork, and clutch jaw to engage the
transmission.
WORM DRIVE TRANSMISSION
Lubrication
The Shifting Process
The upper end of the clutch fork slides over a groove in
a spring loaded rod. This spring pushes the shift fork and
clutch jaw towards the engaged position (Fig. 002).
Fig 002
3428-0150
A. Shift Rod
B. Shift Fork
A. Roll Pin
E. Shift Arm
B. Latch Plate
F.
Screw
C. Dust Filter
G. Shift Rod
D. Dust Cover
A
B
G
B
C
D
E
F
A