Transport (Free-Wheel) System Operation-K55 - Sabre 1338 Gear Technical Manual

THEORY OF OPERATION
1. The first segment of travel (W) is taking-up freeplay
in the brake and return-to-neutral linkages.
2. The next segment of travel (X) is returning the shift
linkage to neutral and engaging the brake.
IMPORTANT: Full brake engagement (drive wheels
stop turning) must not occur until shift linkage
has returned to neutral completely. If this is not
the case, see Tests and Adjustments
procedures later in this section.
3. The last segment of travel (Y) is locking and
unlocking the brake linkage into park.
TRANSPORT (FREE-WHEEL)
SYSTEM OPERATION—K55
Function:
The transport (free-wheel) system allows the operator
to push the tractor while the engine is off, transmission
in or out of either forward or reverse, and the brake
released.
Major Components:
• Internal center block relief valve assembly
• Internal actuating assembly
• External over-center actuating lever assembly
Theory of Operation:
2/12/97
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A
HYDROSTATIC POWER TRAIN
E
G
F
A pair of bypass relief valves (A), located inside the
center block of the transaxle, allow for oil to flow freely
without the pump being turned by the engine and
traction drive system.
When the actuating lever (I) is moved into its over-
center locked position (H), the single chain link
assembly (G) pushes the actuating pin (F) and bracket
(E) against both valve pins (D). As the pins move inside
their guides (B), the return springs (C) become
compressed and the check balls of the relief valves (A)
B
C
D
F
H
I
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