MM40-107/30-107 COMPONENT MAINTENANCE MANUAL WITH IPL
FOR MAIN WHEEL ASSEMBLY PART NO. 40-107 SERIES AND
MAIN BRAKE ASSEMBLY PART NO. 30-107 SERIES
Page 2
Feb 01/02
1.2.3
If a bearing cup is to be replaced, the wheel half must be heated
either in boiling water for 30 minutes, or in an oven not to exceed
149
°
C (300
°
F) before attempting to remove or install a cup. If the
cup does not drop out, tap the cup evenly from the axle bore, using a
fiber drift pin, or a suitable arbor press.
CAUTION:
NEVER EXCEED 500 WHEEL MILES BETWEEN REPACKING
INTERVALS.
1.2.4
Inspect bearing cones for grease contamination and/or solidification
at every periodic inspection. Repack wheel bearings with Aeroshell
grease 22, conforming to MIL -G-81322.
CAUTION:
NEVER PAINT WORKING SURFACES OF THE BEARING CUPS.
1.2.5
Inspect wheel halves for cracks or damage. If casting is cracked, or
shows excessive corrosion, it should be replaced. Small nicks or
gouges in the castings should be blended out and polished with (400
grit) sandpaper. Inspect O-ring (8-20) seating areas for nicks or
distortion. Nicks may be lightly blended with a fine grit sandpaper.
badly distorted sections in this area will hamper O-ring sealing
Characteristics, and is cause for wheel half replacement. Areas from
which the protective coating has been removed, or that show slight
corrosion, should be thoroughly cleaned and repainted with one coat of
zinc chromate primer, and one coat of aluminum (color) polyurethane.
1.2.6
Inspect snap rings and grease seal rings for distortion. Replace
grease seal felts if badly worn or contaminated. Lightly saturate new
or reused grease seal felts with SAE 10 oil before installation (DO
NOT SOAK ).
1.2.7
Inspect brake disc (8-65) for cracks, corrosion, excessive wear,
scoring or warpage. Rust may be removed by hand wire brushing
and finishing with a medium grit sandpaper or emery.
1.2.8
Inspect wheel bolts for cracks and corrosion. Cracked bolts are to
be replaced with a new bolt of corresponding part number. Inspect
metallic self-locking nuts. If the nut can be turned onto the bolt by
hand, so that the bolt will protrude past the end of the nut, it is to be
replaced.
