VALVE AS 4945144 - Caterpillar

Adjusting the Main Relief Valve
Perform the following procedure in order to adjust the main relief valve. The main relief valve maintains the system pressure in the control section of the power train oil pump.
Illustration 1 g00947508
The adjusting screws for the main control valve are located under the top cover of the transmission.
Illustration 2 g00947509
The valve has been removed for clarity.
Loosen jam nut (1). Maintain the position of adjustment screw (2) .Note: One turn of the adjustment screw causes the main relief valve pressure to change by an increment of 235 kPa (34 psi).
Turn adjustment screw (2) until the desired pressure is attained.
Do not allow adjustment screw to rotate when the jam nut is tightened.
Tighten the jam nut to a torque of 18 4 N m (13 3 lb ft).