gf4620b2001a

Single-circuit power steering when driving straightahead, function

Type gf · topic 46.20 · version 0100 · 2016-02-12

Applies to: Steering gear 766.373, 766.375, 766.376, 766.377, 766.378, 766.379, 766.380, 766.381, 766.382, 766.383, 766.385, 766.387, 766.388, 766.394, 766.396, 766.397, 766.399Steering gear 766.421, 766.422, 766.465, 766.469, 766.471, 766.477, 766.481, 766.482, 766.483, 766.484, 766.485, 766.486, 766.487, 766.488, 766.489, 766.495, 766.496, 766.497, 766.498, 766.499Steering gear 766.56, 766.570, 766.580, 766.581, 766.582, 766.583, 766.584, 766.585, 766.586, 766.587

Where it sits

Function group 2 Chassis › 46 Steering › 46.20 Steering gear

EinPAS 22 Steering › 22.15 Power steering › 22.15.1 Basic information

Also applies to engines/gearboxes: 766 376, 766 379, 766 396, 766 397, 766 399, 766 421, 766 422, 766 465, 766 469, 766 471, 766 477, 766 481, 766 482, 766 483, 766 484, 766 485, 766 486, 766 487, 766 488, 766 489, 766 495, 766 496, 766 497, 766 498, 766 499, 766 56*, 766 570, 766 580, 766 581, 766 582, 766 583, 766 584, 766 585, 766 586, 766 587

GF46.20-B-2001A

Single-circuit power steering when driving straightahead, function

12.02.16

Steering gear 766.373, 766.375, 766.376, 766.377, 766.378, 766.379, 766.380, 766.381, 766.382, 766.383, 766.385, 766.387, 766.388, 766.394, 766.396, 766.397, 766.399

Steering gear 766.421, 766.422, 766.465, 766.469, 766.471, 766.477, 766.481, 766.482, 766.483, 766.484, 766.485, 766.486, 766.487, 766.488, 766.489, 766.495, 766.496, 766.497, 766.498, 766.499

Steering gear 766.56, 766.570, 766.580, 766.581, 766.582, 766.583, 766.584, 766.585, 766.586, 766.587

Single-circuit power steering when driving straightahead, function

B46.25-0005-12

ZF hydraulic power steering bogearx

1 Housing

2 Piston

3 Steering rod

4 Worm screw

5 Twisting bar

6 Sector shaft

7 Pressure limiting valve

8 Refueling suction valve

9 Input slot

10 Input slot

11 Return slot

12 Return slot

13 Axial groove

14 Axial groove

15 Return groove

Low pressure in circuit

Rotating valve at neutral position

Single-circuit power steering when driving straightahead, function

B46.20-0052-11

Stroke limiting valves

1 Left adjusting bolt

2 Left cylinder (Activating pin)

3 Left stroke limiting valve

4 Piston

5 Right stroke limiting valve

6 Right cylinder (Activating pin)

7 Right adjusting bolt

Operation

The rotating valve is connected to the steering rod (3) and rotates with the worm shaft (4) when turning the steering wheel

When there is no effort on the steering wheel the torsion bar (5), fastened to the rotating valve and to the worm shaft (4), maintain the same neutral position.

Oil under pressure flows at the central groove of the command bushing and is conducted to the control grooves of the inner rotating valve through three radial holes symmetrically arranged.

The position of the control grooves and the head of the worm thread is adjusted in a way that when the valve is the neutral position, the pressure oil can flow through the intake slots (9) (10) to the inside of the axial grooves in arc form(13) (14) of the worm thread head.

From there on, the oil flows freely through the radial holes to each side of the work cylinder.

While the steering valve is at the neutral position, the oil flow reaches both sides of the work cylinder, as well as flows in the direction of the three return grooves (P) of the rotating valve and returns to the canister from there.

The stroke limiting valves remain closed

Stroke limiting valve - Arrangement, task, structure, operation

GF46.20-B-2103A

Referenced documents