Freightliner Business Class M2. Manual — part 21
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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
Synthetic Oil
–40°F (–40°C) and up
†
75W–90
*
Detroit rear axles do not require the use of friction modifiers.
†
There is no upper limit on the ambient temperature, but axle sump tem-
perature must never exceed 250°F (121°C).
Table 1, Detroit Drive Axle Lubricants
Detroit Rear Axle Lubricant Capacity
Axle
Oil Capacity:
Quarts (liters)
Forward-Rear, Model 4
15.9 (15.0)
*
Single and Rearmost Tandem,
Model 4
10.6 (10.0)
*
Single, Model 2
7.5 (7.0)
†
*
Actual oil capacity might vary slightly depending on gear ratio.
†
Approximate quantity; includes 0.5 quart (0.5 liter) for each wheel end
and with the drive pinion at 3 degrees.
Table 2, Detroit Rear Axle Lubricant Capacity
Meritor
1.
Clean the oil fill hole plug located in the carrier or
the side of the axle housing and the area sur-
rounding it. See
. Remove the plug.
NOTE: Some Meritor axles have a small tapped
and plugged hole located below the housing oil
fill hole. This smaller hole is for the lubricant
temperature sensor only and must not be used
as a fill or level hole.
2.
When the vehicle is on level ground, the lubri-
cant must be level with the bottom of the oil fill
hole. If low, add lubricant. See
for ap-
proved axle lubricants and see
or
for axle capacities.
35–02 Axle Breather Checking
The axle housing breather must remain clean. See
. When the axle lubricant level is checked,
check that the axle breather is open. Check more
often under poor operating conditions. If the breather
is plugged, clean it or replace it as needed.
Meritor Drive Axle Recommended Lubricant
Lubricant Type
Ambient Temperature
Viscosity Grade
Meritor Specification
Hypoid Gear Oil API Service
Classification GL–5
10°F (–12.2°C) and up
*
85W–140
0–76–A
–15°F (–26.1°C) and up
*
80W–90
0–76–D
–40°F (–40°C) and up
*
75W–90
0–76–E
–40°F (–40°C) to 35°F (2°C)
75W
0–76–J
–40°F (–40°C) and up
*
75W–140
0–76–L
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f350062a
1
2
3
1.
Axle Housing Breathers
2.
Carrier Oil Fill Plugs
3.
Interaxle Differential
Fig. 2, Fill Hole Plug and Axle Housing Breather
Locations
Rear Axle
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Meritor Drive Axle Recommended Lubricant
Lubricant Type
Ambient Temperature
Viscosity Grade
Meritor Specification
Synthetic Gear Oil
–40°F (–40°C) and up
*
75W–90
0–76–N
–40°F (–40°C) and up
*
75W–140
0–76–M
*
There is no upper limit on the ambient temperature, but axle sump temperature must never exceed 250° (121°C).
Table 3, Meritor Drive Axle Recommended Lubricant
Meritor Drive Axle Lubricant Capacities for Single
Axles
Axle Model
Capacity
*
:
pt (L)
MS–10–113D
14 (6.6)
MS–12–113D
15 (7.1)
RS–13–120
18.4 (8.7)
RS–15–120
14.3 (6.8)
RS–17–145
33.6 (15.9)
RS–17–144
32.3 (15.3)
RS–19–144
32.3 (15.3)
RS–19–145
33.2 (15.7)
RS–21–145
32.3 (15.3)
RS–21–160
39.5 (18.7)
RS–21–230
38.9 (18.4)
RS–23–160
39.5 (18.7)
RS–23–161
39.5 (18.7)
RS–23–186
47.3 (22.4)
RS–23–240
37.4 (17.7)
RS–26–185
38.0 (18.0)
RS–30–185
38.0 (18.0)
*
Quantities listed are approximate and include 1 pint (0.5 liter) for each
wheel end and with the drive pinion at 3 degrees.
Table 4, Meritor Drive Axle Lubricant Capacities for
Single Axles
Meritor Drive Axle Lubricant Capacities for Tandem
Axles
Axle Model
Axle Position
Capacity
*
RT–40–145
Forward
30.2 (14.3)
Rear
25.8 (12.2)
RT–40–145P
Forward
30.2 (14.3)
Rear
25.8 (12.2)
Meritor Drive Axle Lubricant Capacities for Tandem
Axles
Axle Model
Axle Position
Capacity
*
RT–40–160
Forward
39.1 (18.5)
Rear
34.4 (16.3)
RT–44–145
RT–44–145P
Forward
29.3 (13.9)
Rear
25.1 (11.9)
RT–46–160
Forward
39.1 (18.5)
Rear
34.4 (16.3)
*
Quantities listed are approximate and include 1 pint (0.5 liter) for each
wheel end and with the drive pinion at 3 degrees.
Table 5, Meritor Drive Axle Lubricant Capacities for
Tandem Axles
35–03 Axle Lubricant Changing
and Magnetic Plug
Cleaning
A regular schedule for changing the axle lubricant in
a particular vehicle and operation can be accurately
determined by analyzing oil samples taken from the
axle at specified intervals or mileages. Lubricant sup-
pliers frequently make their laboratory facilities avail-
able for determining the useful life of their product
under actual service conditions. The final schedule
that is recommended may, for economic reasons, be
related to lubricant changes that are governed by
climatic conditions and magnetic plug maintenance.
Change lubricant type and viscosity as climatic tem-
peratures demand, regardless of vehicle mileage or
established change schedule.
The normal operating temperature of compounded
lubricants during the summer season is about 160 to
220°F (71 to 104°C). The chemicals and additives
that give these lubricants increased load carrying ca-
pacity oxidize faster at temperatures above 220°F
(104°C), contributing to more rapid lubricant deterio-
ration. For this reason lubricants of this type that op-
Rear Axle
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erate continuously at high temperatures must be
changed more frequently.
NOTICE
Failure to change the axle lubricant at more fre-
quent intervals, when adverse operating condi-
tions require, could result in axle damage.
Detroit
™
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.
1.
Park the vehicle on a level surface, shut down
the engine, and set the parking brake. Chock the
tires.
2.
Clean the fill plug and the area around it. In the
axle housing rear cover, remove the plug from
the oil fill hole. See
CAUTION
Be careful when draining the axle oil. It may be
very hot, and could cause personal injury if it con-
tacts the skin.
3.
Place a drain pan under the rear axle drain plug.
Drain the oil when it is warm. At this tempera-
ture, the oil will run more freely and ensure that
the axle is flushed.
4.
Clean the fill and drain plugs. Change them if
necessary.
4.1
For magnetic plugs, use a piece of key
stock or any other convenient steel slug
to short the two magnetic poles and divert
the magnetic field.
4.2
Clean away the collected material depos-
ited on each pole. Magnets will rapidly
lose their effectiveness as collected mate-
rial bridges the gap between the two
poles.
4.3
After the first oil is changed, inspect the
drain plug each time for large quantities
of metal particles.
4.4
After cleaning, install the drain plug(s)
and tighten to 30 lbf·ft (41 N·m).
1
2
4
3
2
B
A
12/07/2010
f350509a
A. Front View
B. Rear View
1.
Axle Breather
2.
Breather Hose
3.
Temperature Sensor Port
4.
Oil Fill Plug
Fig. 3, Detroit Tandem Axle (forward axle shown)
Rear Axle
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5.
Fill the axle with the recommended lubricant.
See
for recommended lubricants and
for lubricant capacities.
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.
5.1
Fill the axle through the oil fill hole. Lubri-
cant should be level with the bottom of
the oil fill hole. To check fluid level, see
5.2
Install and tighten the fill plug 30 lbf·ft (41
N·m).
Meritor
Axle Draining
1.
Remove the plug at the bottom of the housing
and drain the lubricant while the unit is warm.
Allow enough time for all the old lubricant to
drain completely.
2.
Clean the drain plugs. For magnetic drain plugs,
a piece of key stock or any other convenient
steel slug may be used to short the two magnetic
poles and divert the magnetic field.
NOTE: Meritor recommends using magnetic
plugs with elements having a minimum pickup
capacity of two pounds (one kilogram) of low-
carbon steel in plate or bar form. Magnets will
rapidly lose effectiveness as collected material
bridges the gap between the two poles. Clean
or change the plugs before this occurs. It may
be necessary to clean or change the plugs one
or more times between lubrication change inter-
vals.
3.
After cleaning the drain plugs, install and tighten
the plugs 35 lbf·ft (47 N·m).
Axle Filling
1.
With the vehicle on a level surface, fill the axle
housings to the bottom of the oil fill hole (in the
carrier or housing) with lubricant. See
for
approved axle lubricants and see
or
for axle capacities.
NOTE: Some Meritor axles have a small tapped
and plugged hole located below the housing oil
fill hole. This smaller hole is for the lubricant
temperature sensor only and must not be used
as a fill or level hole.
2.
Install the fill hole plug and tighten it 35 lbf·ft (47
N·m).
3.
After filling the carrier and housing assembly with
lubricant, drive the vehicle unloaded for one or
two miles (two or three kilometers) at speeds not
to exceed 25 mph (40 km/h) to thoroughly circu-
late the lubricant throughout the assembly.
Rear Axle
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