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
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