POWER STEERING 3B1-3 Power Steering Pump N3A0117E Legend A. 4J series engine B. 4H series engine Tandem Hydraulic Pump the P/S. The hydraulic pump is installed directly to the engine and is driven by gears. It smoothly adapts itself to severe conditions of use, including a wide range of ro- tation speeds, changes in the temperature at which it is used, and frequent changes in load pressure, and it is able to fully perform its functions. A tandem hydraulic pump has two independent hydrau- lic pumps inside one casing. Its main parts can be clas- sified into the following three.
hydraulic pump (vane type) flow control valve pressure relief valve The following is a description of the functions and oper- ation of the main parts. Operation Its drive is transmitted by gears from the engine to the drive shaft of the oil pump, and it turns a rotor that is fit- ted into the spline part of the drive shaft. When the rotor rotates, the ten vanes built into the rotor groove fly out by centrifugal force, are pressed against the inside sur- face of the cam ring, and rotate along the inside surface so that the pump operates. Hydraulic pump Functions The heart of the system, namely the part that supplies hydraulic pressure, which operates the hydro boost and