Maintenance Procedures (Cont)
2-8. GENERAL MAINTENANCE INSTRUCTIONS (CONT).
Replace broken, frayed, kinked, or soft flexible hydraulic hoses. If fittings are damaged, replace
entire hose. Fittings not damaged or corroded can be used on new hoses.
Replace broken, frayed, or kinked air lines. If fittings on nylon lines are damaged, replace
fittings. If fittings on flexible hoses are damaged, replace entire hose. Fittings not damaged or
corroded can be used on new hoses and lines.
To prevent leaks, use pipe thread sealing compound or antiseize tape on threads of air line and
hydraulic hose fittings.
Burring. Remove burrs from gear teeth with fine-cut tile and emery cloth. Remove burrs from
sealing and bearing surfaces with crocus cloth.
Damaged Threads. Replace screws and nuts if threads are damaged. If threads on fittings are
only slightly damaged, chase threads with chasing tool. Replace cross-threaded fittings. Inspect
tapped holes for thread damage. If threads are damaged, tap hole for next oversize screw or
stud. If retapping weakens part of cost of part makes retapping impractical, replace part.
Bearings. Refer to TM 9-214, Inspection, Care, and Maintenance of Antifriction Bearings.
Lubricate bearings before assembly with lubricant used in the related housing. When installing
bearings on shafts, apply pressure to inner race. When installing bearings in housing, apply
pressure to outer race.
Welding. Refer to TM 9-237, Welding Theory and Application. Welding can be used to repair
cracks and breaks in steel parts, such as brackets, panels, and light framework. Because of time
required and chance of later failure, weld only when replacement parts are not available.
Grounding. To ensure good ground connections, clean or grind metal surfaces at connections to
remove paint, oxides, corrosion, oils, and/or grease. After connections are completed, apply
corrosion preventive compound to connections.
Follow these general cleaning instructions and warnings,
Adhesives, solvents, and sealing compounds can burn easily, can give off harmful
vapors, and are harmful to skin and clothing. To avoid injury or death, keep away
from open fire and use in well-ventilated area. If adhesive, solvent, or sealing
compound gets on skin or clothing, wash immediately with soap and water.
Trichlorethylene is toxic to skin, eyes, and respiratory tract. Avoid all exposure. Skin
and eye protection, and exhaust hood on degreasing equipment are required.
Contact unit safety officer for local procedures concerning the use of trichlorethylene
Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Use only
with effective chip guarding and personal protective equipment, goggles, shield, and
Electrical parts such as coils, junction blocks, and switches must not be soaked or sprayed with
cleaning solvents. Clean only with cloth moistened in drycleaning solvent (Item 57,
Soak nonelectrical parts in drycleaning solvent and brush off caked deposits with paintbrush.
Clean rubber parts with hot, soapy water and cloths. Do not clean with solvents.
A degreasing machine may be used to remove heavy grease and oil deposits from metal parts.
Trichlorethylene, MIL-T-27602B (Item 66, Appendix C) is used as degreasing agent.