Brake/Neutral Return Pedal Component Location & Operation - Sabre 1338 Gear Technical Manual

HYDROSTATIC POWER TRAIN
Forward:
B
C
When the shift lever (A) is moved into forward position,
the shift bracket (B) pivots, pulling the turnbuckle link
(C) rearward. The transmission linkage turns the shifter
shaft, and through it, the variable-angle pump
swashplate into forward position.
F
H
With the pump swashplate angled in forward position,
the pump cylinder block pistons are pumping oil
through one side of the center block (D) into the pistons
(E) of the motor, forcing the pistons out against the
fixed-angle swashplate (F) and causing the motor
cylinder (G), motor (output) shaft (H), differential
assembly, and drive axles to turn in the forward
direction.
Reverse:
When the shift lever (A) is moved into reverse position,
the shift bracket (B) pivots in the opposite direction,
pushing the turnbuckle link (C) foreward. The
transmission linkage turns the shifter shaft, and
through it, the variable-angle pump swashplate into
reverse position.
With the pump swashplate angled in the opposite
direction from the forward position, the pump cylinder
block pistons are pumping oil through the other side of
the center block (D) into the pistons (E) of the motor,
forcing the pistons out (on the opposite side) against
the fixed-angle swashplate (F) and causing the motor
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A
E
D
G
K55
cylinder (G), motor (output) shaft (H), differential
assembly, and drive axles to turn in the reverse
direction.
BRAKE/NEUTRAL RETURN PEDAL
COMPONENT LOCATION &
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
Theory of Operation — K55
A
B
N
F
M
G
L
H
K
J
THEORY OF OPERATION
C
D
E
I
2/12/97