Toro 20330 Service Manual - Page 76

Troubleshooting Tips - 3 Speed, Transmission

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THREE SPEED TRANSMISSION TROUBLESHOOTING TIPS - 3 SPEED TRANSMISSION Hard Shifting A raised boss molded into each gear causes the leading edge of the key to depress before it can enter the next gear (Fig. 132). Look at the key and the notch in the gear that it engages. Excessive wear to the tip of the key or the notch in the gear may be the problem (Fig. 133). A B A. Shift collar Fig 133 B. Shift keys 3428-0065 Fig 132 3428-0067 The ring on the shift collar end of the key holds the drive end of the key up. If dried grease or dirt keeps the keys from rocking up and down, the force required to shift gears will increase. Check the cable for free movement where it enters the transmission. These are quick checks and should be made before opening the transmission. If the forces push straight on the key, it will drive the axle. However, if due to wear the force tries to depress the key, it can lower enough to disengage from the notch in the gear (Fig. 134). C A Slipping Gears A The actual gears are in constant mesh. Unless gear teeth are broken off, they cannot slip. If the wheels lurch forward, then pause and lurch again, along with a loud bang each time, the keys might be slipping. A. Gear B. Key B D B Fig 134 gear and key C. Good gear and key D. Worn gear and key 4-12 WPM Drive Systems Manual

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4-12
WPM Drive Systems Manual
THREE SPEED TRANSMISSION
TROUBLESHOOTING TIPS - 3 SPEED
TRANSMISSION
Hard Shifting
A raised boss molded into each gear causes the leading
edge of the key to depress before it can enter the next
gear (Fig. 132).
Fig 132
3428-0067
The ring on the shift collar end of the key holds the drive
end of the key up. If dried grease or dirt keeps the keys
from rocking up and down, the force required to shift
gears will increase. Check the cable for free movement
where it enters the transmission. These are quick checks
and should be made before opening the transmission.
Fig 133
3428-0065
Look at the key and the notch in the gear that it engages.
Excessive wear to the tip of the key or the notch in the
gear may be the problem (Fig. 133).
If the forces push straight on the key, it will drive the
axle. However, if due to wear the force tries to depress
the key, it can lower enough to disengage from the notch
in the gear (Fig. 134).
A
A
B
B
C
D
Fig 134
gear and key
A. Shift collar
B. Shift keys
A. Gear
C. Good gear and key
B. Key
D. Worn gear and key
A
B
The actual gears are in constant mesh. Unless gear
teeth are broken off, they cannot slip. If the wheels lurch
forward, then pause and lurch again, along with a loud
bang each time, the keys might be slipping.
Slipping Gears