Piper SEMINOLE PA-44-180, Maintenance Manual

Page: 349 / 881

LANDING GEAR FREE-FALL VALVE ASSEMBLY
INSPECTION AND REPAIR OF FREE-FALL VALVE
This valve is located on the right side of the forward bulkhead at station 40.75 Inspection is limited to
determining if any signs of hydraulic fluid leakage are evident around the seam between the end fitting and
valve body, and around the periphery of the piston assembly shaft. If leaks appear, the valve assembly should
be replaced since it is impractical to repair the valve.
REMOVAL OF FREE-FALL VALVE ASSEMBLY
1. Loosen cable set screw securing cable to free-fall valve. Remove cable from valve.
2. Disconnect hydraulic lines connected to the valve. Place a rag in position to absorb any hydraulic
fluid spillage that may result. Cap the lines to avoid contamination.
3. Remove the 2 MS35207-264 screws, MS20365-1032C nuts, AN960-10L washers, 80700-6 spacers,
and PS10017-2-10 clamps securing the valve to the frame.
4. Remove the assembly from the airplane.
INSTALLATION OF FREE-FALL VALVE ASSEMBLY.
1. Position valve assembly in proper location in airplane.
2. Secure valve assembly to frame with 2 each PS10017-2-10 clamps, 2 each 80700-6 spacers, 2 each
MS35207-264 screws, AN960-10L washers, and 2 each MS20365-1032C nuts.
3- Apply Titeseal No. 3 in back of the male threads of elbows fittings. Insert fittings into valve an tight-
en. Titeseal should be applied sparingly to prevent it entering the hydraulic system.
4. Push arm assembly to the fully closed position. Pull cable full forward and insert loose end of cable
through hole in bushing of the arm assembly. Tighten set screw on cable so that a 20 in.-lb. pull on
cable will not pull cable from valve.
5. Rig cable with valve in closed position. Rig cable so that valve will hit its internal stop without being
limited by the console in cockpit. (0.03 to 0.06 inch clearance)
NOSE GEAR ACTUATING CYLINDER.
REMOVAL OF NOSE GEAR ACTUATING CYLINDER.
1. Place the airplane on jacks. (Refer to Jacking, Chapter 7.)
— CAUTION —
WHEN MANUALLY RETRACTING THE NOSE GEAR
ASSEMBLY, INSURE THE NOSE GEAR DOWNLOCK IS
F U L LY DISENGAGED BEFORE RELEASING THE
NOSE GEAR DRAG LINKS. DAMAGE COULD OCCUR
TO THE DOWNLOCK IF NOT FULLY DISENGAGED.
2. Disconnect both nose gear door actuating rods.
3 . Disconnect the hydraulic lines from the actuating cylinder and cover the open line ends to prevent
c o ntamination.
4. Disconnect the two gear tension springs from the spring arm that is attached to the right side of the
strut housing.
5. Disconnect the aft end of the cylinder from its attachment fitting.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
29-12-01
Page 29-22
Revised: June 20, 1995
2C17