TM 9--2520--215--34
0005 00--13
THEORY OF OPERATION -- CONTINUED
0005 00
HYDRAULIC SYSTEM – Continued
Action Of Hydraulic System In Neutral, Converter Drive, Right Steer
NOTE
Refer to Torque path in Reverse Range, Converter Drive, Right Steer schematic view for
Torque Path through the transmission.
The description for neutral--range operation applies to this paragraph. The only differences are that pressure
is not blocked at the steer control valve, and the lubrication pressure is not blocked at the right steer clutch.
At the steer control valve, the right (lower) valve moves to the right, while the left (upper) valve moves to the
left. The movement of the left valve to the left has no effect. Steer pressure remains blocked at that point. However,
the movement of the right valve to the right allows pressure to be directed to the right steer clutch. When pressure
enters the central area of the steer valve, it flows to the area at the right end of the valve. This pressure opposes
rightward movement, regulating the pressure flowing to the right steer clutch. Thus a limited rightward movement of
the steer control will result in a limited steer apply pressure. Further movement will increase the applied pressure.
Partial to full steer is available. The degree of steer is proportional to the movement of the vehicle steer con-
trol. In partial steer, the steer clutch is slipping but operating. In full steer clutch is completely applied and there is no
slippage.
When the right steer clutch is applied, the right steer clutch lubrication valve opens. This permits lubricating
oil to flow over steer clutch plates.
DIRECTION OF TRAVEL
LEFT---STEER
CLUTCH APPLIED
REVERSE---RANGE
CLUTCH APPLIED
FASTER ROTATION
SLOWER ROTATION
Torque Path in Reverse---Range, Converter Drive, Right Steer---Schematic View
