Operational Circuits

TM 9-2520-249-34&P

Figure 2-11. Hydraulic system, second gear pivot right steer operation-schematic view.

a. Operational Circuits. This driving condition

Steer Relay Valve.

uses the same hydraulic circuits as second gear, normal

(1) The valve, in the downward position,

right steer (para 2-42, and fig. 2-10), except the vehicle

directs regulated steer pressure from the right steer

operator has selected pivot steer operation. In pivot

valve to the right reverse clutch (fig. 2-13), causing it to

steering, the vehicle pivots in every gear except fourth.

function as the steering element.

b. Pivot Valve (pivot water steer position). In

(2) When the steer relay valve is in the

upward position (fourth-gear signal), the reverse clutch

pivot position, the valve blocks the flow in the second-,

is exhausted and regulated steer pressure is directed to

third-, and fourth-signal circuit. Thus, during operation

the output clutch (fig. 2-13). Thus, pivot steer is

in second gear (also third) the steer relay valve is

prevented in fourth gear (para 2-38e).

downward.

2-26