W203 since 2000 of release
Repair and operation of the car
+ Mercedes-Benz cars of class C (W-203)
+ Operation manual
+ Routine maintenance
+ Cooling system and heating
+ Power supply system and release
+ Engine electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
- Suspension bracket and steering
+ Suspension bracket of forward wheels
+ Suspension bracket of back wheels
+ Angles of installation of wheels of the car
- Steering and safety cushions
Steering and safety cushions - general information and security measures
Security measures during the works with a safety cushion
Removal and installation of the block of a safety cushion on a steering wheel
Removal and installation of a steering wheel
Removal and installation of a tip of steering draft
Removal and installation of a protective cover of the steering mechanism
+ Onboard electric equipment
Steering and safety cushions
Steering and safety cushions - general information and security measuresSteering
Rack steering mechanism
Elements of the rack helmsman mechanism
Steering lath side play compensator
Hydraulic contour and elements of the steering car, sensitive to speed
Steering consists of a steering wheel, a steering column, the steering mechanism in the form of gear and rack transfer and drafts of the steering drive. The steering column transfers the movements of a steering wheel to the steering mechanism. The gear lath of the steering mechanism according to turn of a steering wheel moves to the right or to the left. Steering drafts transmit steering efforts to forward wheels through hinges and a rotary fist.
Gear and rack transfer of the steering mechanism is executed by bezzazorny and does not demand service. Within carrying out maintenance only control of protective covers and dustproof caps of tips of steering drafts is required.
The hydraulic booster providing decrease in the effort made for a steering wheel has steering of the car. The coefficient of strengthening increases at increase in speed of the movement. The hydraulic booster contains a hydraulic pump and the tank of working liquid. The hydraulic pump sucks in liquid from the tank and gives it under high pressure to the operating valve in the steering mechanism. The operating valve has mechanical communication with a steering spindle and directs liquid depending on turn of a steering wheel to the corresponding cavity of the working cylinder in the case of the steering mechanism. Here liquid influences the piston and thus supports management process. At the same time the piston squeezes out liquid from an opposite cavity of the working cylinder via the returnable pipeline in the liquid tank.
Functioning of the power steering (SPS), sensitive to speed
Electronic control the electromagnetic SPS Y10 valve is exercised of the N47 control unit depending on car speed.
At rotation of a steering wheel the leading gear wheel (4b) influences a lath (4j). The rotating ram (4k) by means of the torsion bar (4a) turns around the operating plug (4i) and rests against a lath (4j) that leads to change of relative position of managing directors of flutes. At the same time the oil stream under a pressure moves in the camera of the right or left executive cylinder (I or II), causing the axial shift of a lath (4j) in the corresponding direction. Oil from the unloaded executive cylinder is forced out and through open returnable flutes in the operating plug (4i) goes back to the tank of the steering pump.
Production of welding and leveling works with elements of steering is not allowed. The self-stopped bolts and nuts, and also bolts and nuts having corrosion have to be replaced with new.
In a steering wheel the safety cushion of the driver is located. The safety cushion represents the developing air bag which is filled with air at head-on collision of the car and thus protects the top part of a trunk and the driver's head. At head-on collision of the corresponding force the control unit sends a signal to a safety cushion fuse. As a result of explosion gas which inflates a pillow during several milliseconds is formed. This time is enough to damp movement of the top part of a trunk of the driver moving forward. Then within several seconds the safety cushion develops again since gases come out a pillow through the available openings.