gf4620b2003a

Single-circuit power steering in right steer, 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-2003A

Single-circuit power steering in right steer, 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 in right steer, function

B46.25-0001-12

Hydraulic steering ZF SERVOCOM

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

A Low pressure zone

B High pressure zone

Rotating valve in operation position

Operation

When turning the steering wheel clockwise, the work cylinder piston is displaced to the right.

As the movement of the piston shall be assisted by oil under pressure, this shall be conducted to the left side of the cylinder.

The three control grooves are displaced clockwise and the intakes (10) remain open to the pressurized oil flow.

The inlet openings (9) close, however, blocking the flow of oil under pressure to the axial grooves (14) of the control bushing.

With the rotating valve in this position, the pressurized oil flows through the intake openings (10) to the lower radial groove (13) of the command bushing, from there reaching the left cylinder, thus producing the hydraulic help. The intake openings (9) prevent the oil from spilling to the canister.

The oil is forced out by the right side of the cylinder.

Through the return slots (12) it flows towards the return grooves (15) of the rotating valve.

Through the central hole of the rotating valve, the oil is released to the canister.

The right stroke limiting valve will remain shut until being actuated by the right adjusting screw, slightly before the piston reaches its final position.

Stroke limiting valve - Arrangement, task, structure, operation

GF46.20-B-2103A

Referenced documents