For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC P42 Commercial Chassis 🢒 Steering 🢒 Power Steering System 🢒 Power Steering Pump Description

Power Steering Pump Description for GMC Truck GMC P42 Commercial Chassis 1999

The hydraulic pump is a vane-type pump. The fluid reservoir may be separate from the pump depending on the engine application.

There are 2 bore openings at the rear of the pump housing. The larger opening contains the following components:

•	The cam ring

•	The pressure plate

•	The thrust plate

•

The rotor

•	The vane assembly

•	The end plate

The smaller opening contains the following components:

•	The pressure line union

•	The flow control valve

•	The spring

The flow control orifice is part of the pressure line union. The pressure-relief valve inside the flow control valve limits the pump pressure.