Second Gear, Straight Travel Operation

TM 9-2520-249-34&P

NOTE

2-36.

Second Gear, Straight Travel Operation.

(fig. 2-4)

The related mechanical functions required

for this travel condition are described in

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

15.

Figure 2-4. Hydraulic system. second gear straight travel operation--schematic view

a. Operational Circuits. This driving condition

circuit directs main-pressure oil to three valves-pivot,

steer relay valve, and drive relay valve.

uses the same circuitry as first gear, straight travel,

c. Pivot Valve (normal land-steer position).

except the steer clutches are released and the output

clutches are engaged.

(1) The pivot valve directs main-pressure

b. Manual Selector Valve.

The valve is

oil in the second, third, and fourth signal circuit to the

bottom of the steer relay valve.

moved toward the right until the ball rests in the second

(2) The pivot valve does not affect the

gear detent. In this position, the low-range clutch

circuits involved in any straight travel operation-forward

remains charged and a main-pressure port indexes with

or reverse. Refer to paragraph 2-4d, for description of

the second-, third-, and fourth-gear signal circuit. This

valve effects during normal land-steer operation,

2-17