Fourth Gear, Straight Travel Operation

TM 9-2520-249-34&P

a. Operational Circuits. This driving condition

NOTE

uses the same circuitry as second gear, straight travel,

The related mechanical functions required for

except the intermediate-range clutch is engaged.

this travel condition are described in

b. Manual Selector Valve.

The valve is

paragraph 2-50c, and illustrated in figure 2-

moved toward the right until the retaining ball rests in

17.

the third-gear detent. This allows a main-pressure port

(upper passage) to index with an intermediate-range

2-38.

Fourth Gear, Straight Travel Operation

clutch apply port. The low-range clutch (or high-range

clutch) is exhausted simultaneously through a selector

valve port (lower passage).

Figure 2-6. Hydraulic system. fourth gear straight travel operation -schematic view.

a. Operational Circuits. This driving condition

the fourth-gear detent. This allows main-pressure oil

(upper passage) to charge the high-range clutch and a

uses the same circuitry as third gear, straight travel,

signal circuit to the inhibitor valve group. The fourth-

except that the high-range clutch is engaged, and the

gear signal circuit is also charged. The intermediate-

transmission is in lockup operation.

range clutch is exhausted simultaneously through a port

b. Manual Selector Valve.

The valve is

(lower passage) in the manual selector valve.

moved toward the right until the retaining ball rests in

2-19