Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 423

CAUTION: Use approved fluid only in the power
steering system (Refer to LUBRICATION & MAINTE-
NANCE/FLUID TYPES - DESCRIPTION). No other
power steering or automatic transmission fluid is to
be used in the system. Damage may result to the
power steering pump and system if any other fluid
is used, and do not overfill.

Power steering systems consist of:
• Steering column

• Rack and pinion steering gear

• Belt driven hydraulic steering pump

• Pump pressure and return hoses

• Oil Cooler

OPERATION

The steering column shaft is attached to the gear

pinion. The rotation of the pinion moves the gear
rack from side-to-side. This lateral action of the rack
pushes and pulls the tie rods to change the direction
of the front wheels (Fig. 1).

Power assist is provided by an engine mounted

hydraulic pump which supplies hydraulic fluid pres-
sure to the steering gear.

DIAGNOSIS AND TESTING - POWER STEERING
SYSTEM

There is some noise in all power steering systems.

One of the most common is a hissing sound evident at
a standstill parking. Or when the steering wheel is at
the end of it’s travel. Hiss is a high frequency noise
similar to that of a water tap being closed slowly. The
noise is present in all valves that have a high velocity
fluid passing through an orifice. There is no relation-
ship between this noise and steering performance.

Fig. 1 STEERING COMPONENTS

1 - POWER STEERING PUMP ASSEMBLY
2 - RESERVOIR
3 - HOSES
4 - TIE ROD ENDS
5 - MOUNTING BOLTS
6 - RACK & PINION

STEERING

19 - 1

STEERING NOISE

CONDITION

POSSIBLE CAUSES

CORRECTION

OBJECTIONAL HISS OR
WHISTLE

1. Steering intermediate shaft to dash
panel seal.

1. Check and repair seal at dash
panel.

2. Noisy valve in power steering gear.

2. Replace steering gear.

RATTLE OR CLUNK

1. Gear mounting bolts loose.

1. Tighten bolts to specification.

2. Loose or damaged suspension compo-
nents.

2. Inspect and repair suspension.

3. Internal gear noise.

3. Replace steering gear.

4. Pressure hose in contact with other
components.

4. Reposition hose.

5. Loose or damaged intermediate shaft or
column.

5. Inspect and repair or replace.

CHIRP OR SQUEAL

1. Loose belt.

1. Adjust or replace.

WHINE OR GROWL

1. Low fluid level.

1. Fill to proper level.

2. Pressure hose in contact with other
components.

2. Reposition hose.

3. Internal pump noise.

3. Replace pump.

4. Air in fluid

4. Check for lekas, Evacuate air
from P/S system.

SUCKING AIR SOUND

1. Loose return line clamp.

1. Replace clamp.

2. O-ring missing or damaged on hose
fitting.

2. Replace o-ring.

3. Low fluid level.

3. Fill to proper level.

4. Air leak between pump and reservoir.

4. Repair as necessary.

5. Reservoir cap not installed correctly.

5. Install reservoir cap correctly.

SCRUBBING OR KNOCK-
ING

1. Wrong tire size.

1. Verify tire size.

BINDING AND STICKING

CONDITION

POSSIBLE CAUSE

CORRECTION

DIFFICULT TO TURN WHEEL

STICKS OR BINDS

1. Low fluid level.

1. Fill to proper level.

2. Tire pressure.

2. Adjust tire pressure.

3. Steering components (ball joints/
tie rod ends).

3 Inspect and repair as necessary.

4. Loose belt.

4. Adjust or replace.

5. Low pump pressure.

5. Pressure test and replace if nec-
essary.

6. Column shaft coupler binding.

6. Replace coupler.

7. Steering gear worn.

7. Replace gear.

8. Pump seized / Stuck valve

8. Replace pump.

19 - 2

STEERING

INSUFFICIENT ASST. OR POOR RETURN TO CENTER

CONDITION

POSSIBLE CAUSE

CORRECTION

HARD TURNING OR MOMEN-
TARY INCREASE IN TURNING
EFFORT

1. Tire pressure.

1. Adjust tire pressure.

2. Low fluid level.

2. Fill to proper level.

3. Loose belt.

3. Adjust or replace.

4. Low pump pressure.

4. Pressure test and repair as nec-
essary.

5. Internal gear leak.

5. Replace gear.

STEERING WHEEL DOES NOT
WANT TO RETURN TO CENTER
POSITION

1. Tire pressure.

1. Adjust tire pressure.

2. Wheel alignment.

2. Align front end.

3. Lack of lubrication.

3. Inspect and lubricate suspension
compnents.

4. High friction in steering gear.

4. Replace gear.

LOOSE STEERING AND VEHICLE LEAD

CONDITION

POSSIBLE CAUSE

CORRECTION

EXCESSIVE PLAY IN STEERING
WHEEL

1. Worn or loose suspension or
steering components.

1. Inspect and repair as necessary.

2. Worn or loose wheel bearings.

2. Inspect and repair or adjust
bearings.

3. Steering gear mounting.

3. Tighten gear mounting bolts to
specification.

4. Gear out of adjustment.

4. Replace gear.

5. Worn or loose steering coupler.

5. Inspect and replace as neces-
sary.

VEHICLE PULLS OR LEADS TO
ONE SIDE.

1. Tire Pressure.

1. Adjust tire pressure.

2. Radial tire lead.

2. Rotate tires.

3. Brakes dragging.

3. Repair as necessary.

4. Wheel alignment.

4. Align front end.

STEERING

19 - 3

COLUMN

TABLE OF CONTENTS

page

COLUMN

SPECIFICATIONS - TORQUE CHART

. . . . . . . . . 4

INTERMEDIATE SHAFT

REMOVAL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . . 5

KEY/LOCK CYLINDER

REMOVAL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . . 6

STEERING WHEEL

REMOVAL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . . 6

COLUMN

SPECIFICATIONS - TORQUE CHART

TORQUE SPECIFICATIONS

DESCRIPTION

N·m

Ft. Lbs.

In. Lbs.

Steering Wheel With Air-

bag To Steering Shaft

—

Jacket Tube For Steering

Shaft To Waist Rail

221

U-Joint To Steering Gear

Shaft

212

INTERMEDIATE SHAFT

REMOVAL

(1) Disconnect the ground cable from the battery.
(2) Remove the air bag module from the steering

wheel.

(3) Turn the steering wheel and lock the steering

wheel in the straight ahead position. The position
of the steering gear must not be altered again
for the entire duration of the work procedure.

(4) Remove the electrical center.
(5) Remove the steering wheel bolt.
(6) Remove the steering wheel from the steering

column.

(7) Remove the clockspring. Unscrew the retain-

ing bolts just enough to be able to remove the
clockspring. Do not twist or disassemble the
clockspring.

(8) Remove the combination switch.
(9) Disconnect the electrical connector for the igni-

tion lock.

(10) Remove the spring for the brake pedal from

the steering column.

(11) Remove the fitted bolt from the universal joint

(Fig. 1).

(12) Remove the bolts in the steering column

bracket (Fig. 2).

Fig. 1 U-JOINT REMOVE / INSTALL

1 - FITTED BOLT
2 - U-JOINT

19 - 4

COLUMN

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Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 423

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