Assembly
Page TC-2 Apr 1/05
20-00-02/70-00-01
SECTION V – ASSEMBLY
1. General Assembly Practices
A. Protecting Unit During Assembly
Maintain fits and clearances as specified in applicable manual for unit in work. Exercise extreme care to prevent dirt, dust, or foreign particles from entering the unit. If any foreign particles are dropped into the unit during assembly, stop assembly and find the particle before continuing even though considerable disassembly is involved. For added protection, cover large openings with tape and cardboard and small openings with tape or clean cloth. Plug fuel or lubrication system tubing using plastic caps or plugs, cap or tape all other tube ends. If the unit is to be left for even a short period of time in a partially assembled state, cover all openings.
B. Corrosion Prevention Compound Removal
If any parts were coated with corrosion-preventive compound, remove all traces of this compound and any accumulated foreign matter. (Refer to SECTION II.)
C. Verifying Cleanliness of Parts Check that all parts are cleaned before assembly. Wipe all surfaces with a clean, lint-free cloth.
D. Lubricating Splines and Gear Teeth
When splines or gear teeth are to be mated, lubricate the surfaces as specified in applicable manual.
E. Assembly Inspection, Guidelines, and Precautions
Never use extreme force in the assembly of a unit. If difficulty is encountered, disassemble the unit and inspect for burrs or other interference.
F. Lockwiring Techniques and Requirements
Lockwire unit as specified in applicable manual and paragraph E. Lockwiring is the most positive and satisfactory method of securing in place the various attaching parts of a unit, which cannot be otherwise locked satisfactorily.
G. Bearing and Gear Preparation, Handling, and Assembly Guidelines
Refer to applicable manual for installation and/or assembly procedures for bearings that are components of that equipment. If required, lightly coat all bearings and gear assemblies with lubricant specified in applicable manual, prior to installation.
H. Preparing Shafts for Seal and Packing Installation
Lightly coat all surfaces of shafts that mate with seals and packings, with lubricant as specified in applicable manual.
Assembly
Page 501
Apr 1/05
20-00-02/70-00-01
I. Tagging (Recording) and Shimming Measured Components
When special measurements for shimming or fitting are made on parts or on assembled parts prior to their installation in the next higher assembly, these parts shall be tagged as measured components of the higher assembly and kept with that assembly. If damage or other reason caused replacement of a measured component, all measurements which include that part shall be repeated using the new part.
2. Packing and Seals
A. Lubricating and Installing Packings
Refer to Table 501 when selecting the type of packing lubricant and Figure 501 for a graphic representation of how to install typical packings.
WARNING: THE LUBRICANTS LISTED HAVE BEEN RATED AS NON-IRRITATING AND NON-TOXIC; HOWEVER, PRECAUTIONS SHOULD BE TAKEN TO PREVENT INADVERTENT CONTAMINATION OF EYES AND NASAL PASSAGES. IF SKIN IRRITATION SHOULD OCCUR, WASH THE AFFECTED AREA THOROUGHLY IN CLEAN WATER.
Table 501. Recommended Lubricants
Recommended Lubricant System Usage First Choice Second Choice
Air None OS-124 or Santovac 5 Air/Fuel None OS-124 or Santovac 5
Fuel JP-4 or JP-5 Fuel per OS-124 MIL-T-5624G or Santovac 5
Lubrication Lubricating Oil Per OS-124 MIL-L-23699 or Santovac 5
(1)
Carefully roll lubricated packing over end of part as shown in View A. Roll or slide packing along part, carefully rolling it over any chamfered shoulder, etc., until it drops in groove. After packing installation in groove, remove any twists in packing caused by rolling.
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