Cooler Bypass Valve and Converter-out Circuit

TM 9-2520-249-34&P

2-33. Lubrication Regulator Valve

2-32.

Cooler Bypass Valve and Converter-out

Oil from the oil cooler and cooler bypass valve is

Circuit

directed to the lubrication regulator valve. The regulator

The converter-out circuit directs oil returning from the

valve maintains the lubrication system pressure at 20

converter to the oil cooler and oil cooler bypass valve.

psi and also keeps the fluid-velocity governor cavity

(The oil cooler is not shown on the schematic because it

charged with oil.

When these requirements are

is a vehicle-furnished component.) When the differential

satisfied, the valve opens (20 psi) and allows the excess

pressure at the bypass valve exceeds 40 psi, the valve

to return to the transmission sump. Refer to paragraph

opens and allows some of the returning oil in the

converter-out line to flow into the lubrication circuit.

figure 2-2 and figure 2-13 for explanation of lubrication

When the valve is closed (below 40 psi), all oil in the

circuit.

converterout circuit is directed to the oil cooler.

2-34.

Neutral Operation (fig. 2-2)

Figure 2-2. Hydraulic system, neutral operation--schematic view

Main-Pressure Circuit (red).

pressure is also directed at all times to the steer

regulator valves, drive relay valve, and steer valves.

(1) Source and function. In neutral range,

(2) Throttle valve regulator.

Main

main pressure is supplied only by the input pressure

pressure is blocked at the valve bore by the throttle

pump (fig. 2-1). The oil is directed at all times to the

valve (TV) regulator. At closed throttle, the TV valve is

following valves: throttle valve regulator, flow valve,

held in place by spring compression against the throttle

manual selector valve, brake signal valves, main-

valve which in turn is positioned by the vehicle throttle.

pressure regulator valve, and lockup shift valve. Main

2-13