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 5
Feb 01/02
2.2 Cleaning, Inspection and Repainting
2.2.1
Clean all metal parts in alcohol or suitable solvent.
2.2.2
Replace O-rings.
2.2.3
Inspect brake cylinder (9-20 or 10-20) for cracks, especially in the lug
area around the anchor bolts. Cracks in this area necessitate
cylinder replacement.
CAUTION:
THE LARGE DIAMETER PISTON BORE AND O-RING
GROOVE
SHOULD NOT
BE POLISHED WITH
ABRASIVE MATERIAL.
CAUTION:
NICKS AND BURRS IN THE PILOT BORE AREA CAN
PREVENT THE PISTONS FROM PROPERLY
RETRACTING, RESULTING IN BRAKE DRAG.
2.2.3.1 Piston bores and O-ring grooves should have foreign
material loosened and flushed from all surfaces.
2.2.3.2 Small nicks and light corrosion may be blended and
removed with emery or sandpaper.
2.2.3.3 Inspect the fitting ports and piston bores for contamination.
Light scratches or nicks in the piston bores, pilot bores, or
on the chamfered surfaces within these bores may be
polished out with 600 grit emery, but the final piston bore
small diameter shall not exceed
∅
0.565.
CAUTION:
DO NOT PAINT INTERNAL SURFACES OF PISTON
BORES.
2.2.3.4 Thoroughly clean cylinder of all residue upon completion of
any reworking with available solvent applicable to aluminum.
Any external surfaces from which the protective coating has
been removed, should be cleaned, and painted with one coat
of zinc chromate primer and one coat of aluminum (color)
polyurethane.
