Freightliner Business Class M2. Manual — part 28

46–00 Safety Precautions

Safety Precautions in this section apply to all
procedures within this group.

DANGER

When working on the vehicle, shut down the en-
gine, set the parking brake, and chock the tires.
Before working under the vehicle, always place
jack stands under the frame rails to ensure the
vehicle can not drop. Failure to follow these steps
could result in serious personal injury or death.

46–01 Drag Link Inspection

WARNING

All steering system components are critical for
safe operation of the vehicle. Failure to maintain
the steering system as specified may result in
loss of steering control, which could lead to per-
sonal injury and property damage.

WARNING

All steering system components are critical for
safe operation of the vehicle. Failure to maintain
the steering system as specified may result in
loss of steering control, which could lead to per-
sonal injury and property damage.

Have someone turn the steering wheel from left to
right. Check for movement between the ball stud end
at both the pitman arm and the steering arm. Also
check if the ball stud nut is loose.

If the ball stud end is loose, replace the drag link. If
the ball stud nut is loose, replace the nut and cotter
key. See Group 46 of the vehicle Workshop Manual
for drag link removal and installation instructions.
See Group 00 in this manual for torque specifica-
tions.

Inspect the boot of the drag link at both the pitman
arm and the steering arm end for cracks, splits, or
other damage. Replace the boot as needed.

Grasp the drag link near the pitman arm end, then
push and pull laterally to check for axial movement in
the ball stud end. If it is loose, replace the drag link.

If there is 1/8-inch (3-mm) movement or more, do not
drive the vehicle until the drag link is replaced.

46–02 Power Steering Fluid

Changing

WARNING

Fill only with approved clean fluid. Failure to use
the proper fluid could cause seal deterioration and
leaks. Fluid leaks could eventually cause loss of
power steering assist. This could lead to an acci-
dent resulting in personal injury or property dam-
age. Wear eye protection when changing the fluid
and filter.

1.

Apply the parking brakes and chock the rear
tires.

2.

Place a drain pan under the power steering res-
ervoir.

3.

Remove the retaining ring from the reservoir.
See

Fig. 1

.

4.

Remove the filter and filter cover from the reser-
voir. Drain the fluid from the filter into the drain
pan. Leave the filter hanging over the drain pan.

f461917

1

2

3

4

10/19/2001

1.

Power Steering Reservoir

2.

Retaining Ring

3.

Filter Cover

4.

Return Hose

Fig. 1, Power Steering Reservoir

Steering

46

Business Class M2 Maintenance Manual, August 2015

46/1

5.

Remove the bolts, nuts, and washers that attach
the power steering reservoir to the mounting
bracket. Drain the power steering fluid from the
reservoir, but do not remove the supply line to
the reservoir.

6.

Using bolts, nuts, and washers, attach the reser-
voir to the mounting bracket.

7.

Fill the reservoir with an approved power steer-
ing fluid to the line between the MIN COLD and
MAX HOT lines. See

Fig. 1

. See

Table 1

for ap-

proved power steering fluids.

Approved Power Steering Fluids

Fluid Type

*

Approved Fluid

*

Automatic Transmission
Fluid

Dexron® III

Dexron® II

*

Do not mix fluid types. Refer to the text in this group for a detailed warn-

ing statement.

Table 1, Approved Power Steering Fluids

8.

Raise the front of the vehicle and support it with
jack stands.

9.

Start the engine and operate it at idle. Turn the
steering wheel from full left to full right several
times until clean oil starts flowing from the power
steering filter. Add fluid to the reservoir to main-
tain the fluid level between the MIN COLD and
MAX HOT lines.

10. Shut down the engine and install the filter and

filter cover in the reservoir. Make sure that the
gasket under the filter cover is not damaged. If
the gasket is damaged, replace it. Install the gas-
ket on the reservoir.

11. Attach the retaining ring to the reservoir to se-

cure the filter and filter cover.

12. Start the engine and check that the power steer-

ing fluid level is between the MIN COLD and
MAX HOT lines. Add more power steering fluid if
needed.

13. Raise the vehicle, remove the jack stands, and

lower the vehicle.

14. Remove the chocks from the tires.

46–03 Power Steering Fluid

Level Inspecting

1.

Apply the parking brakes and chock the rear
tires.

2.

With the engine cool, the fluid level should be
between the MIN COLD and MAX HOT lines with
the engine off.

3.

Add or remove fluid as necessary to bring the
fluid level to the line between the MIN COLD and
MAX HOT lines. See

Table 1

for approved power

steering fluids.

4.

With the engine hot, the fluid level should be at
the MAX HOT line with the engine off.

5.

Add or remove fluid as necessary to bring the
fluid level to the MAX HOT line. See

Table 1

for

approved power steering fluids.

6.

Remove the chocks from the tires.

46–04 Power Steering Gear

Lubrication

NOTICE

Apply grease to the sector shaft with a hand-type
grease gun only. Use of a high-pressure power
grease gun will supply grease too quickly and
could affect the high pressure seal, contaminating
the hydraulic fluid.

Using a hand-type grease gun, apply NLGI Grade 2
or 3 multipurpose chassis grease until it starts to
come out past the sector shaft seal. See

Fig. 2

.

46–05 Drag Link Lubrication

1.

Park the vehicle on a level surface, shut down
the engine, and set the parking brake. Chock the
tires.

2.

Using a clean rag, wipe all dirt from the drag link
grease fittings. See

Fig. 3

.

3.

Using a pressure gun and NLGI Grade 2 (8%
12-hydroxy lithium stearate grease) or NLGI
Grade 1 (6% 12-hydroxy lithium stearate grease)

Steering

46

Business Class M2 Maintenance Manual, August 2015

46/2

chassis grease, apply clean grease at the grease
fittings until old grease is forced out of the
socket.

46–06 Power Steering Filter

Changing

1.

Apply the parking brakes and chock the rear
tires.

2.

Raise the front of the vehicle and support it with
jack stands.

3.

Remove the retaining ring from the reservoir.
See

Fig. 1

.

4.

Remove the filter, filter cover, and gasket from
the reservoir.

5.

Disconnect the filter from the filter cover, and dis-
card the filter.

6.

Apply a thin film of power steering fluid on the
gasket of the new filter. Then attach the filter to
the filter cover.

7.

Check for damage to the gasket that was re-
moved from the reservoir. If the gasket is dam-
aged, replace it. Install the gasket on the reser-
voir.

8.

Install the filter and filter cover in the reservoir.
Attach the retaining ring to the reservoir to se-
cure the filter and filter cover.

9.

Check the fluid level in the reservoir. If neces-
sary, add fluid to the reservoir to maintain the
fluid level between the MIN COLD and MAX
HOT lines. See

Table 1

for approved power

steering fluids.

10. Raise the vehicle and remove the jack stands,

then lower the vehicle.

11. Remove the chocks from the tires.

f461071

1

11/28/95

1.

Sector Shaft Grease Fitting

Fig. 2, Steering Gear Lubrication

2

f461072

11/27/95

1

1.

Grease Fitting at Pitman Arm

2.

Grease Fitting at Axle Steering Arm

Fig. 3, Drag Link

Steering

46

Business Class M2 Maintenance Manual, August 2015

46/3

Title of Maintenance Operation (MOP)

MOP Number

CNG Fuel Cylinder Inspecting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–07

CNG Fuel System Inspecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–05

CNG High-Pressure Fuel Filter Element Replacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–06

Fuel Tank Band Nut Tightening. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–01

Fuel/Water Separator Element Replacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–02

LNG Fuel System Inspecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–03

LNG Vacuum Integrity Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–04

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–00

Fuel

47

Index, Alphabetical

Business Class M2 Maintenance Manual, August 2015