C. Insert the piston rod assembly in the master cylinder and secure fitting.
D. Install the master cylinder.
2. Cleveland master cylinder number 10-30. (Refer to Figure 32-23.)
A. Remove the master cylinder from its mounting bracket.
B. To disassemble the master cylinder, first remove the piston rod assembly by removing the retaining ring from the annular slot in the master cylinder housing. Draw the piston rod assembly from the master cylinder.
C. The piston rod assembly may be disassembled by first removing the retaining ring, sleeve, spring, and then the piston assembly, O-ring, and gland, and, if desired, the return spring.
D. Remove the O-rings from the piston and packing gland. INSTALLATION OF BRAKE MASTER CYLINDER. (Refer to Figure 32-24.)
1.
Position brake master cylinder at its mounting points and secure in position with clevis pin. Safety clevis pins with cotter pins.
2.
Connect brake lines to master cylinder fittings. Bleed brakes.
BLEEDING PROCEDURE.
If the brake line has been disconnected for any reason, it will be necessary to bleed the brake system as described below:
1.
Place a suitable container at the brake reservoir to collect fluid overflow.
2.
Remove the rubber bleeder fitting cap located on the bottom of the brake unit housing on the landing gear.
3.
Slide a hose over the bleeder fitting, loosen the fitting one turn and pressure fill the brake system with MIL-H-5606 fluid.
— Note —
By watching the fluid pass through the plastic hose at the top of the brake reservoir, it can be determined whether any air remains in the system. If air bubbles are evident, filling of the system shall be continued untill all of the air is out of the system and a steady flow of fluid is obtained.
4.
Tighten bleeder fitting and remove the hose. Check brakes for proper pedal pressure.
5.
Repeat this procedure on the other gear.
6.
Drain excess fluid from reservoir to fluid level line with a syringe.
32-40-00 Page 32-81 Revised: December 6, 2002
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL
32-40-00 Page 32-82 Revised: December 6, 2002
2J10
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL
POSITION AND WARNING. LANDING GEAR LIMIT SWITCHES.
— Note —
All adjustments of the limit switches should be made with the airplane on jacks. When adjustments are complete, safety wire each limit and squat switch.
ADJUSTMENT OF MAIN GEAR UP LIMIT SWITCH.
A gear up limit switch is located in each wheel well above the gear door hinge. There is no adjustment of these switches other than check that the gear, when retracting, will actuate the switch within .88 of an inch of full up. Switch operation turns the red gear unsafe light out.
ADJUSTMENT OF MAIN GEAR DOWN LIMIT SWITCH. (See Figure 32-26.)
A gear down limit switch is mounted on a bracket which is attached to the lower drag link of each main gear. The switch should be adjusted to allow it to actuate thus turning on the green indicator light within the cockpit when the downlock hook has entered the locked position and is within .025 to .035 of an inch of contacting the downlock pin. (See “Down Lock Rigging,” Figure 32-26.) Adjust as follows:
1.
Ascertain that the main gear downlock is properly adjusted.
2.
Raise the airplane on jacks. (Refer to Chapter 7.)
3.
Ascertain that the landing gear is down and pressure is relieved from the hydraulic system. To relieve pressure, hold down the emergency extender lever.
4.
Raise the downlock hook assembly and place a .030 of an inch feeler gauge between the horizontal surface of the hook (the surface that contacts the downlock pin) and the rounded surface of the pin. Lower the hook and allow it to rest on the feeler gauge.
5.
Loosen the locking nuts of the switch and, while pushing up on the center of the link assembly, screw the switch toward the hook until it is heard to actuate. Retighten the locking nuts of the switch.
6.
Manually move the hook assembly up from the pin until the hook nearly disengages from the pin. Then, with pressure against the bottom of the link assembly, move back to ascertain that the switch actuates within .025 to .035 of an inch of full lock.
7.
Retract and extend the gear by turning the master switch on and moving the gear selector handle to the up position. As the gear begins to retract the green light below the selector should go out and the
red gear unsafe light at the top of the instrument panel should come on.
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