CLS 55 AMG (219.376) V8-5.5L SC (113.990) (2006)
Power Steering Pump: Description and Operation
GF46.30-P-5136TX Power steering pump, component description
Component Identification
Task
The power steering pump supplies the steering gear with pressure oil irrespective of the engine speed.
Design
The power steering pump is designed in accordance with the principle of the vane-cell pump.
Identification of power steering pump manufacturers:
Model 219 with engines M272, M273
LF30 EV2/13 = LuK clutch systems and transmission systems
FP42/12.6 ECO = ZF (Zahnradfabrik Friedrichshafen)
with engine M113
FP42/12.6 = ZF (Zahnradfabrik Friedrichshafen)
Function
The rotation of the drive shaft, and thus of the rotor, produces a centrifugal force which presses the blades on the rotor in the radial direction against
the running surface of the non-moving cam insert. This is assisted by hydraulic oil, which travels from the pressure chamber via bores and grooves and
against the internal end faces of the blades. Ten closed pump cells are thus formed between the ten blades of the rotor.
As the volume increases oil is now drawn out of the reservoir (B) and as the volume reduces oil is forced into the pressure chamber (A).