Iveco EuroCargo (12 to 26 t). Manual — part 158

Figure 5

Demonstration diagrams of tire behaviour and efficiency
depending on pressure.

Figure 6

Figure 7

40% EFFICIENCY

90% EFFICIENCY

100% EFFICIENCY

CORRECT

+ 20%

- 40%

Figure 8

It is advisable that the pair of tires assembled on an axle are
replaced when on the tread, after the small blocks
consumption, continuous bands appear extended to the
whole tire width (displayed in the figures with dots).

The tires further have wear indicators A and B placed next
to indicator TWI for PIRELLI tire (B) and next to MICHELIN
(A) symbol for those of this latter manufacturer: the
replacement is mandatory in case these indicators are
reached.

!

(The values placed inside every figure show the
amount of tire pressure, while the efficiency is
referred to the tire life.)

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12-26 t

WHEELS AND TIRES

9

Base - February 2003

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12-26 t

STEERING

1

Base - February 2003

5014

Steering

Page

DESCRIPTION

3

. . . . . . . . . . . . . . . . . . . . . . . . . .

SPECIFICATIONS AND DATA

4

. . . . . . . . . . . . .

DIAGNOSTICS

4

. . . . . . . . . . . . . . . . . . . . . . . . .

TIGHTENING TORQUES

9

. . . . . . . . . . . . . . . . .

TOOLS

9

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ZF HYDRAULIC POWER STEERING

(8095-8098)

10

. . . . . . . . . . . . . . . . . . . . . . . . . .

- Description

10

. . . . . . . . . . . . . . . . . . . . . . . . . . .

- Hydraulic steering limiting

13

. . . . . . . . . . . . . . . .

HYDRAULIC POWER STEERING DISCONNECTION

AND RECONNECTION (ZF 8095-8098)

14

. .

- Disconnection

14

. . . . . . . . . . . . . . . . . . . . . . . . .

- Reconnection

15

. . . . . . . . . . . . . . . . . . . . . . . . .

HYDRAULIC STEERING LIMITER ADJUSTMENT

16

TRW TAS 55 HYDRAULIC POWER STEERING

17

- Description

17

. . . . . . . . . . . . . . . . . . . . . . . . . . .

- Rectilinear running neutral position

18

. . . . . . . . .

- Right steering position

19

. . . . . . . . . . . . . . . . . . .

- Left steering position

20

. . . . . . . . . . . . . . . . . . . .

HYDRAULIC STEERING LIMITATION

21

. . . . . . .

HYDRAULIC POWER STEERING DISCONNECTION

AND RECONNECTION (TRW TAS 55)

22

. . .

- Automatic adjustment setting of hydraulic steering

limitation for TRW TAS 55 hydraulic power
steering

22

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

- Automatic adjustment check

22

. . . . . . . . . . . . . .

- Hydraulic drops adjustment

23

. . . . . . . . . . . . . .

AIR DRAIN FROM HYDRAULIC

POWER STEERING CIRCUIT

24

. . . . . . . . . . . .

- Hydraulic power steering oil level restoration

24

.

MEASURE OF DRIVE CASE CLEARANCES DETECTED

ON STEERING WHEEL

24

. . . . . . . . . . . . . . . . .

MAXIMUM PRESSURE CHECK IN

HYDRAULIC POWER STEERING SYSTEM

24

.

72607

72608

Figure 1

Figure 2

The steering control system, that can be found on EuroCargo vehicles, is composed of an hydraulic power steering of the
ball-circulation type controlled by a geared pump assembled together with the air compressor.
Such pump has the feature of having its oil tank integrated with the body.

Hydraulic power steering system installation view

1. Hydraulic power steering — 2. Delivery piping — 3. Return piping — 4. Through-wall fitting on return piping — 5. Power

steering pump with integrated tank — 6. Through-wall fitting on delivery piping.

1. Power steering pump — 2. Hydraulic power steering oil tank — 3. Oil insertion plug with level sensor — 4. Air compressor.

View of power steering pump assembled together with air compressor

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12-26 t

STEERING

3

Base - February 2003

5

—

Torsional steering wheel vibrations;

6

—

Excessive steering wheel clearance;

7

—

Oil leakage;

8

—

Insufficient circuit pressure.

Main hydraulic power steering operating anomalies:

1

—

Hard steering in right and left steering;

2

-

Hard steering only in left or right steering;

3

—

Hard steering when the steering wheel is quickly
rotated;

4

—

When one steers, strong impacts occur on steering
wheel;

NO

YES

Insufficient system oil.

Check level with running engine; top-up the oil till the
upper level rod mark and drain the system.

Presence of air in hydraulic circuit.

Check suction pipe and pump shaft gasket seal and
top-up the oil. Drain the system.

NO

1

YES

HARD STEERING

IN RIGHT AND

LEFT STEERING

(continues)

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12-26 t

4

STEERING

Base - February 2003

Steering

Hydraulic

Hydraulic power steering (with ball circula-
tion with embedded pressure limiting
valve)

ZF 8095

ZF 8098

TRW/TAS 55

Variable operating pressure

150 + 15

130 + 13

150 + 10

Reduction ratio

19.6 : 1

22.2 to 26.2 : 1

20.4 : 1

No. of revolutions/steering wheel

5.4

3.1

5.7

Power steering pump with integrated tank
and safety filter valve

ZF FN4 Integral

Min. number of revolutions

Revs/min

600

Max. number of revolutions

Revs/min

2700

Operating pressure

bar

max. 180

Flow rate

dm

3

/min

16

Maximum operating temperature

100 º C

Tutela GI/A oil
It complies with ATF DEXRON II specification

DIAGNOSTICS