John Deere stx38 - Manual (Page 189)

3/21/97
5 - 25
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
S
T
U
R