Cleveland
Wheels & Brakes
Parker Hannifin Corporation
Aircraft Wheel & Brake
1160 Center Road, P.O. Box 158
Avon, Ohio 44011 USA
1-800-BRAKING (272-5464)
216-937-1272
l
FAX 216-937-5409
PRODUCT
REFERENCE
MEMO
Initial Release December 10, 1984
Rev B July 1, 1995
PRM36
Page 1 of 2
INSTALLATION OF SELF-ADJUSTING RETRACT MECHANISM
ON 30-107 AND 30-107B BRAKE ASSEMBLIES
1. Chock main and nose wheel tires.
2. Set parking brake and apply a slight amount of pressure to brakes.
3. WHILE WEARING SAFETY GLASSES carefully loosen the bolt which retains the existing retract springs
to the back of the hydraulic pistons. (Typically 8 places.) Remove and discard all parts.
4. Release parking brake.
5. Remove hydraulic feed line to brake assembly and cap.
6. Remove the 24 bolts which attach the back plates to the brake cylinders and remove brakes from aircraft.
7. Screw one of the back plate attachment bolts into each piston in succession and, with hand pressure,
push each piston out of the brake cylinders. (MARK EACH PISTON AND BORE TO ENABLE CORRECT
RE-ASSEMBLY.)
8. Remove o-rings from cylinder bores and pistons and discard.
9. Thoroughly clean cylinders and pistons using available solvent applicable to aluminum.
10. Special attention should be given to the piston bores and pistons.
A. Piston bores and o-ring grooves should have foreign material loosened and flushed from all surfaces.
(The large diameter piston bore and o-ring groove should not be polished with any abrasive material.)
B. The small diameter of the piston bore may be polished with steel wool or fine emery, but the finished
diameter shall not exceed .565 minimum.
C. The piston (large diameter) may be polished to remove shallow wear scratches and/or nicks. The final
piston diameter, however, must not be smaller than 2.121 inch.
D. Any prior rework to the above mentioned components which places them outside of the dimensional
limits defined, requires replacement of those components.
