Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...

Wheel Bearing Lubrication
PART 8: MAINTENANCE AND SERVICE
Type of
Lubricant
Eaton-
Approved
Synthetic
Eaton-
Approved
Synthetic
in axle with
extended
drain
interval
option
On-Highway
Mi.(km)
240,000
(384,000)
350,000
(560,000)
Maximum
Change
Interval
On/Off
Highway
Severe
Service
Mi.(km)
2 Years 120,000
(192,000)
Wheel Bearing Lubrication
Oil-lubricated Driven Hubs
Maximum
Change
Interval
Yearly
in the hub; if none, add oil through the differential filler hole.
(Note: Remember to replace vent plug or threaded filler
plug when done.) Allow time for the oil to seep through the
bearings when initially filling a hub. Maintain the differential
oil level by adding oil until its surface is even with the bottom
of the filler hole (see "Master Lubrication Index").
Oil-lubricated Nondriven Hubs
Use CD50 synthetic transmission fluid SAE 50W or equivalent.
A minimum of 9 oz. (270 ml) of lubricant is required for
proper lubrication of an LMS hub; 10 - 13 oz. (295 - 400
ml) is required for a non-LMS hub, depending on wheel design.
Allow time for the fluid to seep through the bearings
when initially filling a hub. When properly filled, the fluid
level will lie between the fluid level line and 1/4” above the
line. (Note: Remember to replace vent plug when done.)
Grease-Lubricated Hubs
Use hypoid oil, A.P.I.-GL-5 SAE 80W-90 or equivalent. A
minimum of 1 quart (921 ml) of oil is required for proper
lubrication of each drive hub. Add oil through the filler hole
Repack the hub bearing with clean wheel bearing grease
after disassembling, cleaning, and inspecting.
– 144 – Y53-6015 R(08/07)