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Freightliner Columbia. Manual - part 26

Brake Chamber Stroke Specifications

Chamber

Max Applied Stroke: inch (mm)

Manufacturer

Type

Size

†

Haldex

Standard Stroke

1-3/8 (35)

1-3/4 (44)

2-1/2-Inch Extended Stroke

2 (51)

3-Inch Extended Stroke

2-1/2 (64)

Standard Stroke

2 (51)

Long Stroke

2-1/2 (64)

Meritor

Standard Stroke

Less than 1-1/2 (38)

Less than 1-3/4 (44)

Less than 1-7/8 (48)

Long Stroke

Less than 2 (51)

Standard Stroke

Dana Spicer

Long Stroke

16L

2 (51)

20L

24L

24LS

2-1/2 (64)

30LS

Long stroke design is indicated by a tag, or embossing, on the brake chamber.

†

Specifications are relative to a brake application with 80 to 90 psi (550 to 620 kPa) air pressure in the brake chambers.

‡

If type 36 chamber is used, slack length should be less than 6 inches.

Table 1, Brake Chamber Stroke Specifications

Brakes

42/11

Title of Maintenance Operation (MOP)

MOP Number

Bellows Replacement, Rack and Pinion Steering Gear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46–07

Drag Link Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46–01

Drag Link Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46–05

Power Steering Fluid Level Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46–03

Power Steering Fluid and Filter Changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46–02

Power Steering Gear Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46–04

Rack and Pinion Steering Gear Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46–06

Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Steering

Index, Alphabetical

Safety Precautions

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.

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

Have someone turn the steering wheel from left
to right. Check for movement between the ball
stud end and the pitman arm, and between the
ball stud end and the steering arm.

If the ball stud end is loose, replace the drag
link.

Check the ball stud castle nut for looseness.

If the castle nut is loose, replace it and the cotter
pin. See

Group 00

for torque specifications.

Inspect the boot of the drag link at both the pit-
man arm and the steering arm end for cracks,
splits, or other damage. Replace the boot if
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, re-
place the drag link. See Group 46 of the
Columbia Workshop Manual for replacement in-
structions. 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

and Filter 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.

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

Place a drain pan under the power steering res-
ervoir, and remove the steering gear-to-reservoir
return hose at the reservoir. Drain the power
steering fluid into the drain pan and dispose of
the fluid properly. Plug the return line fitting on
the reservoir.

Loosen the clamp and remove the cover along
with the filter spring and the filter top plate.

NOTE: Always replace the power steering reser-
voir filter when changing the fluid.

Remove the filter. It may be necessary to wiggle
the filter to remove it from its base. Do not use
pliers to aid in removal of the filter; pliers could
cause metal chips to enter the steering system.
Clean the inside of the reservoir, using a lint-free
cloth.

IMPORTANT: Do not start the engine while
draining the system.

Place the disconnected end of the steering gear-
to-reservoir hose in the drain pan. Raise the front
of the vehicle with a floor jack and support it with
jack stands. Have someone turn the steering
wheel to full lock left and right. Capture the fluid
flowing from the hose in the drain pan. Add fluid
to the reservoir as needed. When clean power
steering fluid flows from the hose, remove the
plug from the reservoir and reconnect the hose
to the reservoir. Remove the jack stands and
lower the vehicle.

With the larger opening at the top, install a new
filter in the reservoir.

Steering

46/1

Clean the reservoir cover and gasket. Inspect the
O-ring and the cover for cracks, deformities, or
damage. Replace the gasket seal or cover as
needed.

Install the reservoir cover along with the spring
and the top plate. Make sure the center of the
top plate fits into the opening at the top of the
filter.

Place the clamp over the flanges of the cover
and shell assembly, then tighten 25 to 30 lbf·ft
(35 to 40 N·m).

10. Using ATF fluid that meets Dexron III or TES-389

specifications,, fill the power steering reservoir to
the FULL COLD mark.

11. Start the engine and operate it at idle. Turn the

steering wheel to full lock left and right to adjust
the fluid level and remove any existing air from
the power steering pump and gear. Recheck the
fluid level. Add fluid as needed. The system is
properly bled when the steering pump does not
labor when turning the wheel.

12. Check for leaks in the power steering system

and repair as needed. Top off the power steering
fluid level as needed.

46–03 Power Steering Fluid

Level Inspection

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

With the engine cool, use a shop towel or a
clean rag to clean the area around the power
steering reservoir fill cap. Twist the cap counter-
clockwise to remove it. Check the cold power
steering fluid level. The level should be between
ADD COLD and FULL COLD with the engine off.

Start the engine and run it at idle until it reaches
operating temperature.

Remove the dipstick, and check that power
steering fluid is between ADD HOT and FULL
HOT. If necessary, add enough ATF fluid that
meets Dexron III or TES-389 specifications to
bring the level up to the FULL HOT mark on the
dipstick.

46–04 Power Steering Gear

Lubrication

Sheppard Steering Gears

Sheppard power steering gears manufactured with-
out grease fittings are maintenance-free. If the power
steering gear has no grease fitting, then it requires
no periodic lubrication.

Sheppard power steering gears with grease fittings
must be lubricated periodically.

Wipe off debris from the bearing cap grease fit-
ting. See

Fig. 1

Using a hand-type grease gun, apply multipur-
pose chassis grease until grease starts coming
out of the bearing cap dirt-and-water seal.

TRW Steering Gears

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

f460296a

05/28/93

Bearing Cap Grease Fitting

Fig. 1, Sheppard Bearing Cap Lubrication

Steering

46/2

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