Freightliner Century Class. Manual — part 29
Brake Chamber Stroke Specifications
Chamber
Max Applied Stroke: inch (mm)
Manufacturer
Type
*
Size
†
Haldex
Standard Stroke
12
1-3/8 (35)
16
1-3/4 (44)
20
24
2-1/2-Inch Extended Stroke
24
2 (51)
3-Inch Extended Stroke
24
2-1/2 (64)
Standard Stroke
30
2 (51)
Long Stroke
30
2-1/2 (64)
Meritor
Standard Stroke
9
Less than 1-1/2 (38)
12
16
Less than 1-3/4 (44)
20
24
Less than 1-7/8 (48)
Long Stroke
24
Less than 2 (51)
Standard Stroke
30
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
42–11 Versajust Slack Adjuster
Inspection and
Lubrication
IMPORTANT: Perform the Brake Inspection
maintenance operation before lubricating the
slack adjusters.
1.
Visually check for physical damage, such as bro-
ken air lines and broken or missing parts.
2.
Using a quality multipurpose chassis lubricant,
NLGI Grade 2, lubricate the slack adjuster
through the grease fitting until clean lubricant
flows from the grease relief opening in the boot.
3.
Perform the "In Service Inspection."
In Service Inspection
1.
Apply and release the brakes several times while
observing the slack adjuster. The slack adjuster
and brake actuator should move freely, without
binding or interference, and should return to the
full released position. Observe the looseness that
exists between the clevis and adapter bushing
and the yoke and link pins and their mating parts
(clevis, body, link). Replace these parts if loose-
Brakes
42
42/11
ness appears excessive. Make certain the brake
actuator pushrod jam nut is tightened securely.
2.
Inspect the slack adjuster for physical damage,
paying attention to the link, boot, and clevis. If
any components are damaged, repair or replace
them as necessary.
3.
Measure the brake actuator pushrod stroke while
making an 80 to 90 psi (552 to 621 kPa) brake
application. Actuator pushrod strokes should not
exceed the values shown in
and
. To achieve the correct pressure for this
test, build the system pressure up to a 100 psi
(690 kPa). Shut down the engine. Fan the
brakes to attain a 90 to 95 psi (621 to 655 kPa)
reading. Make and hold a full brake application
while the strokes are checked.
Actuator Stroke–Standard Stroke
Brake Actuator Size
Recommended Maximum
Operating Stroke (Inches)
30
2
24
1-3/4
20
1-3/4
16
1-3/4
12
1-3/8
Table 2, Actuator Stroke–Standard Stroke
Actuator Stroke–Long Stroke
Brake Actuator Size
Recommended Maximum
Operating Stroke (Inches)
30 Long Stroke
2-1/2
24 Long
2
24 Long Stroke
2-1/2
20 Long
2
16 Long
2
Table 3, Actuator Stroke–Long Stroke
Brakes
42
42/12
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46–00
Steering
46
Index, Alphabetical
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.
1.
Park the vehicle on a level surface, shut down
the engine, and set the parking brake. Chock the
tires.
2.
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.
3.
Check the ball stud castle nut for looseness.
If the castle nut is loose, replace it and the cotter
pin. See
for torque specifications.
4.
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.
5.
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 Century
Class Workshop Manual for replacement instruc-
tions. 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.
1.
Park the vehicle on a level surface, shut down
the engine, and set the parking brake. Chock the
tires.
2.
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.
3.
Use the following procedure for Century Class
Conventionals. For Argosy COEs, go to the next
step.
3.1
Use one hand to apply downward pres-
sure to the power steering reservoir
cover. Remove the flanged nut and rub-
ber washer. See
. Remove the
cover.
NOTE: Always replace the power steering
reservoir filter when changing the fluid.
3.2
Lift out the filter spring and the filter top
plate, then 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.
3.3
Place the disconnected end of the steer-
ing 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
Steering
46
46/1
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