DAF CF65, CF75, CF85 Series . Manual - part 937

©

 200423

1-1

Steering gear, general

TECHNICAL DATA

ΧΦ65/75/85 series

7

0

1. STEERING GEAR, GENERAL

1.1 GENERAL

Steering box

Circulation pressure

Final limiting pressure

Internal leakage in steering box

Internal play in steering box

Dual-circuit steering system

Steering pump

Maximum system pressure

175 + 5 bar,

see steering box type plate

Maximum system pressure for vehicles equipped 

with a 150N air-sprung front axle and a wheel 

base in excess of 5300 mm

150 + 10 bar

see steering box type plate

Maximum admissible circulation pressure of the 

steering mechanism at a steering oil temperature 

of 50

C

- Steering box THP 80 and THP 90

5 bar

- Steering box THP 91

10 bar

- Steering box THP 92

20 bar

Final limiting pressure at a steering oil 

temperature of 50

C and an engine speed of 

1200 - 1400 rpm

maximum 90 bar

Maximum permissible internal leakage in the 

steering box
- steering box without slave cylinder

3.8 l/min.

- steering box with slave cylinder

5.7 l/min.

Maximum admissible internal play of the steering 

box with a blocked pitman arm

4.5

 on the input shaft

Second circuit activation if main steering pump 

output

< 6 l/min.

Output indicator cut-in pressure, circuit 1

< 6 l/min.

Output indicator cut-in pressure, circuit 2

< 2-3 l/min.

CF65 vehicle series

ZF 7685

FAN vehicle version

LUK LF77

FAX vehicle version

LUK VT72A

Steering gear with slave cylinder

LUK VT77

Other

LUK VT77

TECHNICAL DATA

1-2

©

 200423

Steering gear, general

0

ΧΦ65/75/85 series

7

Steering pump output
Steering pump output at a steering oil 

temperature of 50

C, a pressure of 50 bar and an 

engine speed of 1200 - 1400 rpm
Steering pump ZF 7685

17.0 - 22.8 l/min.

Steering pump LUK LF77

22.5 - 30 l/min.

Steering pump LUK VT72A

12.6 - 16.8 l/min.

Steering pump LUK VT77 (steering gear with 

slave cylinder)

25.2 - 33.6 l/min.

Steering pump LUK VT77

17.0 - 22.8 l/min.

©

 200423

2-1

Steering box

TECHNICAL DATA

ΧΦ65/75/85 series

7

0

2. STEERING BOX

2.1 GENERAL

Steering box

The gear ratio depends on the vehicle type.

Wheel deflection limiting valve

Internal steering box resistance

Pipe connections

Type

right-angled transmission 

automatic bleeding system, 

automatically adjustable wheel 

deflection limiting valves and 

pressure-limiting valve.

Type:

THP 80

single circuit steering box. 

Application: front axle 150N/

152N/156N.

THP 90

single circuit steering box. 

Application: front axle 182 and 

186N.

THP  91

dual-circuit steering box without 

slave cylinder. Application: 

vehicles requiring emergency 

steering gear.

THP 92

dual-circuit steering box with 

slave cylinder. Application: 

vehicles requiring emergency 

steering gear and fitted with a 

slave cylinder.

Final limiting pressure at a steering oil 

temperature of 50

C and an engine speed of 

1200 - 1400 rpm

maximum 90 bar

Internal resistance outside the pressure point 

(slip moment)

maximum 270 Ncm

Internal resistance increase in the pressure point

80 -120 Ncm

Single-circuit steering box THP 90:
- Connection P

delivery pipe

- Connection R

return pipe

- Steering box connection, top

slave cylinder, front

(1)

- Steering box connection, rear

slave cylinder, rear

(1)

TECHNICAL DATA

2-2

©

 200423

Steering box

0

ΧΦ65/75/85 series

7

(1) Viewed as if in driving direction

Output indicators

Dual-circuit steering box TAS 91 and TAS 92:
- Connection P1

main steering pump delivery pipe

- Connection P2

emergency steering pump delivery pipe

- Connection R1

return pipe, circuit 1

- Connection R2

return pipe, circuit 2

- Connection C1

slave cylinder, front

(1)

- Connection C2

slave cylinder, rear

(1)

A

B

P2

P1

R2

R1

C1

C2

S7 00 409

A

Output indicator circuit 1

B

Output indicator circuit 2