Mtd 2 Speed Transmission Theory Of Operation - MTD Garden Tractors User Manual

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MTD 2 SPEED TRANSMISSION THEORY OF OPERATION

Before starting the disassembly of the trans-
mission, we want to explain its operation. A
clear understanding of the MTD 2 speed tran-
saxle, part number 618-0229 and its operation
will allow you to better troubleshoot any prob-
lems that you may have with it.
Since the tractor must be stopped before
changing gears, there is a jog built into the shift
lever lockout plate in the neutral position. This
hardened steel plate will not allow the operator
to skip across gears or double engage the
transmission. It allows the shift lever, shift
forks, and clutch collars to only move in certain
directions as shown in Figure 5-18.
Figure 5-18
In a neutral position the input pulley drives the
input shaft and pinion gear, the bevel gear, and
the drive shaft. The clutch collars also turn with
the drive shaft but do not engage any drive
gears. The high/low range clutch collar as
shown in Figure 5-19 is on the left and has
engagement lugs on both sides of the collar.
The reverse clutch collar is on the right and
has lugs on the side facing the reverse chain
assembly. See Figure 5-19.
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Figure 5-19
Since this is a constant mesh transmission all
three gear sets are turning regardless of which
gear you are in. Only the gear set that is
engaged by the shift collar drives the output
shaft and axle. The other two gear sets are
free spinning on the drive shaft. See Figure 5-
20.
Figure 5-20
To shift into low range the high/low clutch collar
is moved to the left by the shift forks and
engages the 10 tooth gear. The 10 tooth gear
drives the 37 tooth gear on the output shaft
that then drives the bull gear, differential
assembly, and the axle shafts. See Figure 5-
21.
5-6