FUNCTION:
The surge relief valve threads into a passage of the rockshaft cylinder. The valve protects the cylinder and its related parts from damage due to excessive pressure.
MAJOR COMPONENTS:
– Surge Relief Valve
– Rockshaft Cylinder
– Rockshaft Piston
THEORY OF OPERATION:
As long as pressure inside the rockshaft cylinder is less than 17200 kPa (172 bar) (2494 psi), tension from relief spring (D) holds relief ball (E) closed. If pressure increases suddenly and exceeds spring pressure, relief ball unseats, allowing oil back to sump. This condition can occur when the rockshaft encounters a sudden increase in implement load.
