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1. General. No repairs are permitted to any part of the landing gear or tall wheel units, consequently all damaged parts must be replaced by standard spares. The replacement of parts may be facilitated by the use of the disassembly drawings of the landing gear and tall wheel. These drawings, figures 52A and 53 contain call-outs of all subassemblies. 2. Bushing. With regard to hushed holes in the landing gear and the tall wheel units, wear should occur only inside of the bushing and, consequently, only the bushing will have to be replaced. Most bushings are replaceable with standard parts and do not require rereading after installation. If the bushing is used with a shaft where a special tolerance between the shaft and the bushing must be held, it will be necessary to control the shaft diameter to suit the design requirements. Oilite bushings cannot be reamed after installation; however, the hole may be burnished for close control of inside diameter when the condition warrants. In hand reaming, for diameters up to 1 inch, the tolerance of 0.001 inch should be maintained; for diameters above 1 inch, the tolerance should be 0.002 inch. |
For machine reaming, the tolerance of diameters up to 1/2 inch. should be 0.005 inch; for diameters of 1/2 inch to 1 inch, 0.001 inch, and for diameters above 1 inch, ± 0.0015 inch. A rule to use for circular fits, such as shafts in bearings, or bushings in fittings is as follows: Compare the maximum dimension of the hole with the minimum dimension of the shaft and the minimum dimension of the hole with the maximum dimension of the shaft. For example: Hole Shaft .875 inch ± .0015 inch .873 inch ± .000 inch - .001 inch - .002 inch .8765 inch - .871 inch .0055 inch clearance, max .874 inch - .873 inch .001 inch clearance, minm |
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