33–05 Wheel End Inspection
and Maintenance, 6,000-
Pound and 8,000-Pound
Steer Axles with Oil-
Lubricated Hubs
Periodic inspection and maintenance of wheel ends
on 6,000-pound and 8,000-pound steer axles is es-
sential to sound wheel bearing performance. Check
for leaks at the oil seal and hub, and inspect the lu-
bricant per the maintenance intervals provided in
of this manual.
Oil Seal Leak Check
Check for evidence of oil leakage at the oil seal. If a
leak is found, replace the seal. See
Section 33.02
of
the
Business Class® M2 Workshop Manual
for
instructions.
Hub Cap Leak Inspection
Check for evidence of oil leakage between the hub
cap, gasket and hub surface. If leakage is evident,
replace the gasket with a new one. See
Section
33.01, Subject 100
of the
Business Class® M2
Workshop Manual
for instructions.
Check for a missing hub cap fill plug or vent plug.
See
. Replace any missing parts. If a vent plug
is missing, the oil quality is compromised and must
be replaced. See
Section 33.01, Subject 100
of the
Business Class® M2 Workshop Manual
for
instructions.
Lubricant Inspection
Rotate the hub so that the fill plug is down, and drain
a small sample of hub oil into a plastic container that
is free of debris, especially any metallic particles.
Then use a magnet to probe the sample. Note
whether there is substantial metallic debris present,
and compare the oil color to new approved oil. Ac-
ceptable oil will have a color similar to new oil and
have no water or metal contaminants.
If the oil is not acceptable, inspect the bearings for
damage. Replace the bearings as needed, and install
the hub per
Section 33.01, Subject 100
of the
Business Class® M2 Workshop Manual
.
If the oil is acceptable, check the oil level. If it is not
full (see
), fill it to the bottom of the vent plug
hole with approved lubricant (see
Lubricant Specifications, Over-the-Road Service
Applications
Lubricant Type
Lubricant SAE
Viscosity Grade
Synthetic Drive Axle Lubricants or
Equivalent with SAE Specification
J2360 or Military Specification MIL-L-
2105E
75W-90
Table 1, Lubricant Specifications, Over-the-Road
Service Applications
33–06 All-Axle Alignment
Check
Drive Axle Alignment Checking
Check the axle alignment, parallelism, and thrust
angle measurements for the rear drive axles. Use the
applicable procedure and specifications in
Group 35
of the vehicle Workshop Manual.
f330247a
A
1
2
01/05/200
9
A. Hub Cavity Full
1.
Vent Plug
2.
Magnetic Drain/Fill Plug
Fig. 8, Stemco Hub Cap
Front Axle
33
Business Class M2 Maintenance Manual, November 2016
33/5
Property of American Airlines
