John-deere stx38 User Manual download pdf (Page 189)

3/21/97

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POWER TRAIN

THEORY OF OPERATION

Reverse:

As in forward—likewise in reverse, with engine running

and clutch engaged, the transaxle input sheave turns

rapidly in a clockwise direction.

Power is transferred through the belt drive sheave into

the input shaft pinion gear (C). The bevel drive gear (J)

of the splined drive shaft (G) then carries the power

through the splined small drive chain sprocket (U), the

drive chain (T), and into the large drive chain sprocket

(S) of the intermediate shifter/brake shaft (F).

When the operator shifts the shift lever into reverse,

the shifter fork (Q), shift collar (P), and shift keys (D)

become keyed to the large drive chain sprocket (S),

which turns in the opposite direction as the free-

wheeling transfer gears (E). Because the large drive

chain sprocket (S) has been engaged by the shift keys

(D), the shaft (F) turns in the reverse direction and

transfers power through the left side spur gear (O) into

the idler shaft combination gear (N), which also turn in

the opposite direction as they did in forward.

Power is then transferred into the differential and out

the drive axles to the drive wheels and tires, also in this

reverse direction.

Neutral:

When the operator moves the shift lever into neutral

position, the shifter fork (Q) places the shift keys (D)

under the free-floating spacer (R), allowing no power to

be transmitted into the intermediate shifter/brake shaft

(F), which also allows neutral to be maintained with

clutch pedal released and engine running.

M42318

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John-deere stx38 User Manual Page 189