| AN 01-25CN-2 | PARAGRAPH 1 |
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(c) TO ASSEMBLE THE OLEO STRUT. 1. Before assembling the oleo strut, thor. oughly inspect and clean all parts. Any parts found defective in any way should be replaced. Use only alcohol to clean the oleo strut parts. 2. If the plunger has been removed from the cylinder, clean the cylinder top with "PERN-A-CLOR" degreasing solution. 3. Place the cytioder in a vertical position and secure it in a vise as illustrated in figure 55. 4. Mold a generous ring of asbestos and water mxture around the cylinder as illustrated in figure 55, to restrain the he-at from going down into the lower part of the cylinder. 5. Apply heat from a torch to the top of the cylinder and move the torch around the circumference of the cylinder continuously. Apply heat to both the inside and outside surfaces. Keep the torch moving continuously so that the metal will not be burned in one spot. 6. Have several pieces of tube solder in ring form so that they will just fit inside the cylinder. Brush the inside of the cylinder around the flange with a soldering solution of 155ro zinc chloride, 3517o glycerine, and 50% water. Drop a solder ring into the cylinder upon the flange. 7. Place the plunger assembly on a cradle so that it may be revolved, and heat the end of the plunger around the groove above the threads. 8. Brush on soldering solution and apply a generous coating of solder in the groove and on the nut face. Do not solder up the tWO spanner wrench holes on the nut face. 9. Brush the solder with a clean wire brush and insert the plunger into the cylinder. 10. Tighten the plunger into the cylinder with a spanner wrench. 11. Place a steel ruler on the top of the cylinder to see if the plunger has the proper protrusion above the cylinder. The bottom of the cotter hole in the plunger should be flush with the top of the steel rule. If the protrusion is not sufficient, the plunger must be removed and more solder applied to build up the cylinder flange or another plunger installed. It, is |
imperative that the cotter hole in the plunger comply with the above measurement or it will be impossible to safety the plunger nut when the upper trunnion cap and nut are installed. (See Fig. 55.) 12. After the plunger is properly as7-mbled in the cylinder, drop about three more rings of solder into the cylinder while applying heat. Drop these rings in one at a time. This should thoroughly seal the joint and build up a solid cap around ihe plunger face. 13. Clean the outside of the top of the cylinder where the heat was applied with a solution of 5% soda ash, 117, potassium bichromate, and 9401o water. Polish with a cloth and set the cylinder aside to cool. 14. When the cylinder has cooled sufficiently, remove the asbestos mold. The cylinder is now ready for the assembly of the remainder of the units. 15. First assemble the piston by placing it in a wooden block clamp and inserting the clamp in a vise to secure it from turning. 16. Insert the metering pin. in the metering pin wrench, be sure to install a new copper washer on the threaded end below the nut, and insert the wrench with the pin into the cylinder. Screw in the metering pin tightly. 17. Slide the gland nut onto the piston, threaded end first, and then slide on the lower packmg ring, the five packings, and the upper packing ring. 18. Slide the sleeve over the piston and screw on the piston bearing until it is tight. 19. Install the three lock screws and fill the screw heads with solder to safety them in place. Buff off the solder so that there are no burrs -or sharp edges to score the cylinder wall. The piston is now completely assembled and ready for installation in the cylinder. 20. Wet the packings thoroughly with hy. draulic oil (Spec. 3586) so that they will slide into the cylinder easily. 21. Slide the piston into the cylinder, secured in a wooden block clamp, and tighten the gland nu with a spanner wrench. Tighten the nut firmly bu not excessively and tighten the set screw in the cylinder. The strut is now ready for the preliminary test. |
