784C and 785C Off-Highway Truck/Tractors Steering System Caterpillar


Relief Valve (Cylinder Crossover)

Usage:

785C 1HW



Illustration 1g00434058

Location of the cylinder crossover relief valve




Illustration 2g00298579

(1) Valve

(2) Valve

(A) Port

(B) Port

The relief valve is used to prevent damage from high pressure oil in the cylinder circuit. This occurs when the steering wheel is stationary and an outside force on a front wheel suddenly moves a cylinder rod into a cylinder or out of a cylinder.

While the steering wheel is stationary a sudden movement of the front wheels due to striking an object will cause an increase in the oil pressure in one end of each cylinder. This increase in oil pressure is also felt through port (A) or port (B) by valve (1) or valve (2). At an oil pressure of approximately 18270 kPa (2650 psi), valve (1) or valve (2) will open. This will allow oil flow to the low pressure side of the cylinders.

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