John Deere stx38 - Manual (Page 244)

6 - 12
3/21/97
THEORY OF OPERATION HYDROSTATIC POWER TRAIN
Reverse:
K50 Version Shown
When the shift lever (D) is moved into reverse position,
the shift bracket (F) pivots in the opposite direction,
pushing the turnbuckle (E) forward, pivoting the
bellcrank (G), link strap (H), shifter lever (I), shifter
shaft (J), and variable-angle pump swashplate (O) into
reverse position. With the pump swashplate angled in
reverse position, the pump cylinder block pistons (N)
are pumping oil through the other half of the center
block (P) into the motor half of the center block causing
the motor cylinder block (Q) to rotate against it’s fixed-
angle swashplate, turning the motor (output) shaft (M),
differential assembly (L), and drive axles (K and R) in
the reverse direction.
BRAKE/NEUTRAL RETURN
SYSTEM COMPONENT LOCATION
AND OPERATION
Function:
The brake system allows the operator to slow down or
stop the tractor, return the shift linkage to neutral, and
lock the brake into park.
Major Components:
• Foot pedal
• Frame cross rod and bellcrank
• Brake rod, compress spring, and strap
• Brake rod return spring
• Brake rod adjustment coupler
• Transaxle brake assembly and return spring
• Shift linkage
• Shift/return-to-neutral bracket
• Shift bracket return-to-neutral strap and bushing
• Shift bracket support strap
• Park locking rod
• Park locking lever
• Park locking spring
D
M55852
M58252
F
D
E
G
J M58253
H
I
E
J
N
O
P
Q
M
L
K
R
M58269