7.
Remove anchor bolt by the following procedure:
A. Position cylinder assembly on a holding fixture. (Refer to Figure 32-19, Removal.)
B. Use a suitable arbor press to remove the anchor bolt from the cylinder body.
8.
Install anchor bolt by the following procedure:
A. Support anchor bolt in a holding fixture. (Refer to Figure 32-19, Step A.)
B. Align cylinder body over anchor bolt. (Refer to Figure 32-19, Step B.)
C. Use a suitable arbor press and apply pressure on the spot face directly over the anchor bolt hole. (Refer to Figure 32-19, Step C.)
CLEANING, INSPECTION AND REPAIR OF WHEEL BRAKE ASSEMBLY.
1.
Clean the assembly with a suitable solvent and dry thoroughly.
2.
Check the wall of the cylinder housing and piston for scratches, burrs, corrosion, etc., that may damage “O” rings.
3.
Check the general condition of the brake bleeder screw and lines.
4.
Check the brake disc for wear, grooves, scratches or pits. The minimum disc thickness of Disc 164-46 used on heavy duty Wheel Assembly 40-120 is .405. A single groove or isolated grooves up to .030 of an inch deep would not necessitate replacement, but a grooving of the entire surface would reduce lining life and should be replaced. Should any cracks be found to exceed a length of .80 inch or a depth of .210 inch in the 164-46 disc assembly, replace the disc. If the crack depth is not measurable, replace the disc if the crack length exceeds .400 inch. The disc should be immediately replaced if any crack extends into the welded seam between the flange and cup.
32-40-00 Page 32-73 Revised: December 6, 2002
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL
32-40-00 Page 32-74 Revised: December 6, 2002
2J2
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL
32-40-00 Page 32-75 Revised: December 6, 2002
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL
5. The riveted type lining may be removed from the backing plates by drilling out the old rivets using a 5/32 drill. Install a new set of linings using the proper rivets and a rivet set that will properly stake the lining and form a correct flair of the rivet. The snap-on type lining used on optional heavy duty assemblies may be removed by prying loose with a screwdriver or a thin flat wedge. Install the snap-on type by positioning onto the pins and applying pressure to snap into position.
— Note —
Standard duty brake linings should be conditioned by performing a minimum of six light pedal effort braking applications from 25 to 40 mph. Allow the brakes to partially cool between stops. This conditioning procedure will cure the resins in the brake linings, yet will not cause the material to become carburized due to excessive heat.
Replacement brake linings used on optional heavy duty brakes should be conditioned by performing 3 consecutive hard braking applications at 45 to 50 mph. Do not allow brake discs to cool substantially between stops. This will wear off any high spots and at the same time generate sufficient heat to glaze the surface of the metallic linings Once the linings are glazed, they will provide many hours of maintenance free service.
ASSEMBLY AND INSTALLATION OF WHEEL BRAKE ASSEMBLY. (Refer to Figure 32-18.)
1.
Lubricate the piston “O” ring(s) with fluid MIL-H-5606 and install on piston(s). Slide the piston in cylinder housing until flush with surface of housing.
2.
Slide the lining pressure plate onto the anchor bolts of the housing.
3.
Slide the cylinder housing assembly on the torque plate of the gear.
4.
Position the lining back plate between the wheel and brake disc. Install the bolts and torque to 40 inch-pounds to secure the assembly.
5.
Connect the brake line to the brake cylinder housing.
6.
Bleed the brake system.
PARKING BRAKE VALVE.
REMOVAL OF PARKING BRAKE VALVE.
1.
Disconnect the parking brake cable from the valve actuating arm.
2.
Disconnect the fluid lines from the valve.
3.
Remove the screws that attach the valve to its mounting bracket.
4. Place a protective material over the line openings to prevent contamination of the system. DISASSEMBLY OF PARKING BRAKE VALVE. (Refer to Figure 32-21.)
1.
Remove the two fittings from the outside of the valve body. A valve spring is held in place by the fittings. Use caution not to loosen these when removing the fittings.
2.
From the valve body, remove the valve spring and valve.
3.
To remove the valve cam, remove the nut, washer, bushing and spring and pull the cam from the valve body.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：西门诺尔飞机维护手册 simenole PA-44-180 AMM 2(18)
