TM-9-2520-254-34
TRANSMISSION, AUTOMATIC, ALLISON, MODEL TX100-1
TECHNICAL MAUAL; DIRECT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1971
TM-9-2520-254-34 - Page 27 of 126
manual selector is at the 2-3 position, the trans-
mission cannot downshift to low range. This is
prevented by a main pressure branch, at the top,
left side of the manual selector valve bore, which
directs main pressure to the upper area surface of
the low-intermediate shift plug, and to the lower
end of the shift valve. This pressure holds the low-
intermediate shift valve upward as long as the
manual selector is at 2-3 position.
b. Other Functions Same as 1-2-3 Operation
(fig.
2-7). In high-range (2-3) operation, the other
circuits operate as described in paragraph 2-17 for
high-range (1-2-3) operation.
2-19. Hydraulic System—Reverse-Range
Operation
a.
Main-Pressure Circuit
(red—fig. 2-8).
(1) In reverse-range
operation, the main
pressure circuit functions as described in paragraph
2-15a, except for the distribution of oil at the
manual selector valve. Here, the valve is at its
extreme upward position. This permits oil to flow
into the reverse-range clutch circuit. When the
valve is at any other position, the reverse-range
clutch exhausts into the manual selector valve bore
above the selector valve.
2-18
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