Freightliner Business Class M2. Manual — part 20
Toe-In Inspection
For vehicle alignment to be accurate, the shop floor
must be level in every direction. The turn plates for
the front wheels must rotate freely without friction,
and the alignment equipment must be calibrated
every three months by a qualified technician from the
equipment manufacturer. Freightliner dealers must
have proof of this calibration history.
1.
Apply the parking brakes and chock the rear
tires.
2.
Raise the front of the vehicle until the tires clear
the ground. Place safety stands under the axle.
3.
Using spray paint or a piece of chalk, mark the
entire center rib of each front tire.
4.
Place a scribe or pointed instrument against the
marked center rib of each tire, and turn the tires.
The scribe must be held firmly in place so that a
single straight line is scribed all the way around
each front tire.
5.
Place a turn-plate or turntable under both front
tires. Remove the safety stands and lower the
vehicle. Remove the lock-pins from the gauges;
make sure the tires are exactly straight ahead.
NOTE: If turn-plates or turntables are not avail-
able, lower the vehicle. Remove the chocks
from the rear tires and release the parking
brakes. Move the vehicle backward, then for-
ward about six feet (two meters).
6.
Place a trammel bar at the rear of the front tires;
locate the trammel pointers at spindle height,
and adjust the pointers to line up with the scribe
lines on the center ribs of the front tires. See
. Lock in place. Check that the scale is set
on zero.
7.
Place the trammel bar at the front of the tires
(see
) and adjust the scale end so that
the pointers line up with the scribe lines. See
8.
Read the toe-in from the scale, and compare it to
the toe-in specification in Group 33 of the ve-
hicle Workshop Manual. If corrections are
needed, refer to Group 33 of the vehicle Work-
shop Manual for instructions on adjusting the
toe-in.
A
B
f330082a
08/29/94
NOTE: B minus A equals toe-in.
Fig. 9, Wheel Toe-In (overhead view)
f330014a
08/30/94
Fig. 10, Trammel Bar Positioning
Front Axle
33
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f400100a
08/30/94
Fig. 11, Setting Trammel Bar Pointers
Front Axle
33
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33/7
Title of Maintenance Operation (MOP)
MOP Number
Axle Breather Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35–02
Axle Lubricant Changing and Magnetic Plug Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35–03
Axle Lubricant Level Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35–01
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35–00
Rear Axle
35
Index, Alphabetical
Business Class M2 Maintenance Manual, August 2015
35–00 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.
35–01 Axle Lubricant Level
Checking
NOTICE
Failure to keep the rear axle filled to the proper
level with the recommended lubricant can result in
rear axle damage.
Detroit
™
1.
Park the vehicle on a level surface, shut down
the engine, and set the parking brake. Chock the
tires.
2.
If the vehicle has just been driven, allow a few
minutes for the lubricant to settle.
IMPORTANT: On Detroit axles, the oil change
interval for long haul vehicles can be extended
to 500,000 miles (800 000 km) for axles with
weight ratings of 34,000 to 40,000 lb (15 000 to
18 000 kg) using synthetic lubricant if a lubricant
analysis shows adequate quality. Oil must be
changed at least every four years, and more
often if the axle is exposed to high temperatures
and steep grades.
3.
Clean the fill plug and the area surrounding the
fill plug on the side of the axle carrier. Remove
the plug. Check lubricant level when the axle is
cold, or near room temperature.
NOTE: Some Detroit axles have a small tapped
and plugged hole near and below the housing
oil fill hole. This smaller hole is for a lubricant
temperature indicator only, and should not be
used as a fill or level hole.
4.
Check that the lubricant is level with the bottom
of the fill hole. See
. If low, check for oil
leaks, and correct as needed. Add oil to the level
of the fill plug, using the lubricant recommended
in
. See
for lubricant capacities.
IMPORTANT: A lubricant level close enough to
be seen or touched is not sufficient. It must be
level with the bottom of the fill hole.
5.
Install and tighten the fill plug 30 lbf·ft (41 N·m).
IMPORTANT: Always check the axle breather
whenever checking the lubricant level. Check
the breather more frequently under adverse op-
erating conditions.
6.
Check the axle housing breather. Make sure that
it is open and unclogged. If the breather is
plugged or damaged, clean or replace it as
needed.
Detroit Drive Axle Lubricants
*
IMPORTANT: Lubricant used in Detroit rear axles must
meet Mercedes-Benz specification 235.20 (mineral) or
235.8 (synthetic). Mobil Delvac
™
Gear Oil A 80W-90 and
Mobilube
™
HD-A Plus 80W-90 meet specification 235.20.
Mobil Delvac 1 Gear Oil 75W-90 and Mobilube 1 SHC
75W-90 meet specification 235.8. For more product
information, see http://bevo.mercedes-benz.com.
Type
Ambient Temperature
SAE
Viscosity
Grade
Mineral Oil
–15°F (–26.1°C) and up
†
80W–90
f350061a
A
B
08/17/2009
A. Correct (lube level at bottom of fill hole)
B. Incorrect (lube level below fill hole)
Fig. 1, Axle Lubricant Level Inspection
Rear Axle
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