Main Gear Assembly Instructions
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Questions and Answers

How can the upper bearing components be removed from the piston tube?

  • Push out the upper bearing retaining pins (correct)
  • Remove the bolt at the top of the strut housing
  • Unscrew the snap ring at the bottom of the tube
  • Slide the outer and inner 'O' rings from the tube
  • What is the correct procedure to remove the orifice plate from the orifice tube?

  • Pull out the snap ring at the top of the fork
  • Unscrew the bolt at the top of the fork
  • Release the snap ring at the bottom of the orifice tube (correct)
  • Push out the orifice plate from the top of the strut housing
  • How can one remove the piston tube plug located at the lower end of the tube?

  • Remove the bolt assembly at the top of the fork and push a rod up through the hole in the body of the fork (correct)
  • Slide out the washer and snap ring from the tube
  • Push out the plug from the bottom of the tube
  • Unscrew the bolt at the top of the strut housing
  • What component should be secured with the snap ring (22) during the assembly of the orifice tube?

    <p>Orifice plate (21)</p> Signup and view all the answers

    Where should the 'O' ring (19) be installed during the assembly process?

    <p>On the upper end of the tube</p> Signup and view all the answers

    Which part of the fork tube assembly should have outer and inner 'O' rings (9 and 11)?

    <p>Lower bearing (10)</p> Signup and view all the answers

    Study Notes

    Main Gear Assembly

    • Adjust doors one at a time, ensuring no load is exerted on the cylinder, and retraction rods pass freely through their holes.
    • Extend the landing gear, connect both doors, and retract the landing gear fully to ensure a 0.31-inch gap between the doors.
    • Take up each retraction rod two additional turns to pre-load the doors.

    Disassembly of Main Gear Oleo

    • The main gear oleo assembly can be removed and disassembled from the gear oleo housing with the gear removed from or installed on the airplane.
    • Place the airplane on jacks and a drip pan under the main gear to catch spillage.
    • Remove air and fluid from the oleo strut by depressing the air valve core pin, removing the air charge valve, and siphoning out hydraulic fluid.
    • Disconnect the brake hydraulic lines above the bracket on the main gear fork assembly.
    • Remove the torque link assembly by removing the cotter pin, nut, washer, and bolt from the strut housing and fork assembly.

    Removing Components

    • Remove the piston tube components by pushing out the upper bearing retaining pins.
    • Remove the upper bearing, spacer, lower bearing, "O" rings, and wiper strip from the tube.
    • Remove the orifice tube by removing the bolt and washer from the top of the strut housing.
    • Remove the orifice plate from the bottom of the orifice tube by releasing the snap ring.
    • Remove the piston tube plug with "O" ring by removing the bolt assembly and inserting a rod up through the fork.

    Inspection and Repair

    • Inspect components for corrosion, scratches, nicks, and excess wear.
    • Repair is limited to smoothing out minor scratches, nicks, and dents, and replacing parts.
    • Service tolerance for wear of components can be found in Table VII-III.

    Assembly of Main Gear Oleo

    • Ensure parts are clean and inspected before assembly.
    • Press the tube end into the fork body, aligning the bolt holes, and drill a pilot hole if necessary.
    • Install the piston tube plug with "O" ring, lubricating the tube and plug with hydraulic fluid.
    • Assemble the orifice tube by inserting the orifice plate and securing it with a snap ring.
    • Install the tube into the strut housing, with the packing, washer, and bolt.
    • Assemble the fork tube by installing the tube components in the correct order.

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    Description

    Learn about the step-by-step instructions for main gear assembly, including adjusting the doors, connecting bolts, extending and retracting the landing gear, and pre-loading the doors. Instructions also include disassembly of the main gear oleo assembly.

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