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Freightliner Business Class M2. Manual - part 14

Mercedes-Benz Transmission Lubricant Type

Lubricant Type

Temperature:

°F (°C)

SAE

Viscosity

Synthetic transmission
lubricant meeting Eaton PS-
386 lubricant specification

All

—

Table 9, Mercedes-Benz Transmission Lubricant Type

Mercedes-Benz Transmission Lubricant Capacities

Transmission Model

Refill Capacity:

qt (L)

MBT660S-6O

9.5 (9.0)

MBT520S-6D

9.5 (9.0)

Quantities listed are approximate. Fill the transmission until the lubricant

is level with the bottom of the fill hole, with the vehicle in normal operating
position.

Table 10, Mercedes-Benz Transmission Lubricant

Capacities

NOTICE

Use only approved synthetic transmission lubri-
cant that meets the requirements of the Eaton PS-
386 lubricant specification. Do not mix fluid types.
Adding lubricants that are not approved for use in
the transmission could damage the radial seals.

Clean the fill plug before installing it.

Install the fill plug (p/n N000908 020001) and a
new aluminum gasket (p/n N 00763 024105).
Tighten the fill plug 42 lbf·ft (57 N·m).

26–07 Mercedes-Benz

Transmission Leak
Checking

Park the vehicle on a level surface. Apply the
parking brakes and chock the rear tires.

Check for signs of leakage at the breather. See

Fig. 9

2.1

If leakage is found, check the breather for
a missing cap. Replace the cap if neces-
sary.

2.2

Check the fluid level at the fill plug. If the
level is too high, correct the fluid level.

Check for signs of leakage at the cap seal on the
shift lever. If the cap seal is damaged, replace it.

Check for signs of leakage at the radial seal on
the output shaft. If leakage is found, remove the
output yoke (end yoke) and replace the seal. For
procedures, see Section 26.02, Subject 120 of
the Business Class® M2 Workshop Manual.

f260006b

10/05/94

A. Full

B. Low

Fig. 8, Mercedes-Benz Transmission Fluid Level

Checking

05/22/2001

f261101

NOTE: The transmission is shown from the left-hand
side.

Shift Lever Cap Seal

Breather

Output Shaft Radial Seal

Countershaft Cover Plate

Transmission Fluid Fill Plug

Transmission Fluid Drain Plug

Gear Case Seals

Clutch Slave Cylinder

Input Shaft Radial Seal

Fig. 9, Mercedes-Benz Transmission Leak Check

Transmission

Business Class M2 Maintenance Manual, March 2016

26/10

NOTE: There are two cover plates on the coun-
tershaft, one at the front and one at the rear.

Check for signs of leakage at the rear cover
plate on the countershaft (next to the output
yoke). If leakage is found, check the torque on
the cover-plate bolts and check the flat seal for
damage.

5.1

If the flat seal is damaged, replace it.

5.2

If the cover-plate bolts are too loose,
tighten them 18 lbf·ft (25 N·m). If the
cover-plate bolts are too tight, replace the
flat seal and tighten to 18 lbf·ft (25 N·m).

Check for signs of leakage at the transmission
fluid fill plug. If leakage is found, check the
torque on the plug and check the aluminum gas-
ket for damage.

6.1

If the gasket is damaged, replace it.

6.2

If the fill plug is too loose, tighten it 42
lbf·ft (57 N·m). If the fill plug is too tight,
loosen it, then tighten it to 42 lbf·ft (57
N·m).

Check for signs of leakage at the transmission
fluid drain plug. If leakage is found, check the
torque on the plug and check the aluminum gas-
ket for damage.

7.1

If the gasket is damaged, replace it.

7.2

If the drain plug is too loose, tighten it 42
lbf·ft (57 N·m). If the plug is too tight,
loosen it, then tighten it to 42 lbf·ft (57
N·m).

Check for fluid dripping at the gear case seals. If
substantial leakage is found at either location,
replace the transmission.

NOTE: Weeping or sweating seals are not
cause for transmission replacement.

WARNING

Clutch hydraulic fluid (DOT 4 brake fluid) is haz-
ardous. It may be a skin irritant and can cause
blindness if it gets in your eyes. Always wear
safety glasses when handling clutch hydraulic
fluid or bleeding hydraulic lines. If you get clutch
hydraulic fluid on your skin, wash it off as soon
as possible.

Check for signs of leakage at the clutch slave
cylinder.

NOTICE

Do not spill clutch hydraulic fluid (DOT 4 brake
fluid) on the cab paint. Clean it off immediately if
any is spilled. DOT 4 brake fluid can damage
paint.

9.1

If leakage is found on the slave cylinder
body, check the fittings and hose for dam-
age.

9.2

If leakage is found on the piston seals,
replace the slave cylinder and bleed the
clutch hydraulic system. For detailed in-
structions, see Group 25 of the Business
Class® M2 Workshop Manual.

9.3

If the slave cylinder fittings and/or the
hose are damaged, replace them.

9.4

Check the torque on the slave cylinder
mounting capscrews. Tighten them 13
lbf·ft (18 N·m).

9.5

If any leakage of clutch hydraulic fluid is
found, check the fluid level in the reser-
voir, and add fluid if needed. For detailed
procedures, see

Group 25

of this

manual.

NOTE: There are two cover plates on the coun-
tershaft, one at the front and one at the rear.

10. Check for signs of leakage at the clutch bell

housing. If leakage is found, check the radial
seal on the input shaft, the front cover plate on
the countershaft (inside the clutch bell housing),
and the rear radial seal on the crankshaft.

10.1

If the radial seal on the input shaft is
leaking, replace the radial seal. For pro-
cedures, see Section 26.02, Subject 120
of the Business Class® M2 Workshop
Manual.

10.2

If the cover plate on the countershaft is
leaking, replace the cover plate. Apply
liquid gasket (Loctite 518) to the new
cover plate when installing it.

10.3

If the rear radial seal on the engine
crankshaft is leaking, replace the rear ra-
dial seal. For procedures, see the engine
manufacturer’s manual.

Transmission

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26/11

11. Remove the chocks from the tires.

Transmission

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Title of Maintenance Operation (MOP)

MOP Number

Fifth Wheel Inspecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31–02

Fifth Wheel Lubricating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31–03

Frame Fastener Torque Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31–01

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31–00

Trailer Electrical Connector Lubricating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31–04

Frame and Frame Components

Index, Alphabetical

Business Class M2 Maintenance Manual, March 2016

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