7 Lubrication
ArvinMeritor Maintenance Manual MM-0361 (Revised 04-10)
7 Lubrication
Hazard Alert Messages
Read and observe all Warning and Caution hazard alert messages in
this publication. They provide information that can help prevent
serious personal injury, damage to components, or both.
To prevent serious eye injury, always wear safe eye protection
when you perform vehicle maintenance or service.
Park the vehicle on a level surface. Block the wheels to
prevent the vehicle from moving. Support the vehicle with
safety stands. Do not work under a vehicle supported only by
jacks. Jacks can slip and fall over. Serious personal injury and
damage to components can result.
Drive axles generate small metal wear particles at a fairly steady
rate, especially during the break-in period. If these fine, but hard
particles are allowed to circulate in the lubricant, along with external
moisture and dirt, internal components will wear at a much faster
rate than normal.
Magnets and Magnetic Drain Plugs
Front drive axles are equipped with magnetic drain plugs that have a
minimum pick-up capacity of 1.5 pounds (0.7 kilograms) of low
carbon steel.
The magnetic drain plug can be reused if, after cleaning, the plug
has a minimum pick-up capacity of 1.5 pounds (0.7 kilograms) of
low carbon steel.
Inspect the magnetic drain plug each time the oil is changed. Use
the correct part. Pipe plugs will leak if used as a drain plug.
Cover the breather when steam cleaning the housing to
prevent water from entering the housing and contaminating
the oil. Damage to components will result.
Baffle-type breathers help keep axles free from external moisture
and dirt which can cause premature oil and component failure.
Always use the correct tools and procedures when replacing
seals to ensure correct installation and help prevent seals
from leaking.
Seals keep lubricant in and dirt out of a component. When they are
worn or damaged, seals leak and produce low lubricant levels which
may damage components.
Durable triple-lip seals, standard in Meritor axles, protect the quality
and levels of the lubricant and provide superior performance.
Temperature Indicators
Meritor axles can operate above 190°F (88°C) without damage.
However, if the oil temperature reaches 250°F (121°C), stop
the vehicle immediately and check for the cause of
overheating. Damage to components can result.
Many Meritor axles have a tapped hole in the housing for the
installation of a lubricant temperature indicator that will help reduce
the failure of axle parts from overheated oil.
Check and Adjust the Oil Level
1. Park the vehicle on a level surface.
2. Remove the fill plug from the axle.
3. The oil level must be even with the bottom of the fill plug hole.
If oil flows from the hole when the plug is loosened:
The oil level is high. Let the oil drain to the correct level.
If the oil level is below the bottom of the fill plug hole:
Add the specified oil.
4. Install and tighten the fill plug to 35-50 lb-ft (48-67 Nm). @
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