If the system is not automatic and the pump runs but there is no movement of the pistons, then you have a hydraulic issue. Could be bad valves, most likely the shuttle valve inside the manifold.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7