TM 9-2320-269-20-1
PRESHOP ANALYSIS
The purpose of preshop analysis is to find out how much repair, modification, or replacement is needed to fix the
equipment as outlined in this manual. Sometimes the reason for equipment failure can be seen right away, and therefore
complete teardown is not necessary for repair. Disassemble equipment only as far as necessary to replace broken parts.
All tags and forms attached to the equipment must be checked to find out the reason for removal from service. Also, check
all Modification Work Orders (MWO) and Technical Bulletins (TB) for equipment changes and updates.
In some cases you may damage a part just by removing it. If the part appears to be good, and other parts behind it are not
defective, leave it on and continue with procedure. Here are a few simple rules:
1.
Don't take out dowel pins unless bent, broken, or damaged.
2.
Don't pull out bearings or bushings unless they are damaged. If you have to get at a damaged or defective
part behind them, pull off bearings or bushings very carefully.
3.
Replace all gaskets, lockwashers, sealing nuts, sealing screws, and seals.
CLEANING
All parts must be cleaned before inspection and assembly and after repair. If a part is removed from the vehicle, wipe off
grease and grime before removal so metal or fiber particles will not fall into delicate engine or hydraulic components.
Clean inner and outer surfaces of metallic parts and all areas that get greasy or oily with drycleaning solvent (item 28,
appendix C). Clean out sludge and gum with stiff brush. Put small parts in wire mesh basket before immersing in solvent.
Use steam cleaning to take off grease and dirt buildup. After drycleaning solvent has been applied, dry with clean rags.
CAUTION
Use soap and water only to clean rubber and plastic parts. Drycleaning solvent will cause the parts to
deteriorate rapidly.
Use clean water or soap and water to clean rubber or plastic material. Clean off rust on metallic parts with wire brush or
abrasive cloth. Use low pressure compressed air to blow away rust and cloth particles. Clean off solder with soldering iron.
Hydraulic system components must be cleaned and dried carefully so that dirt and metal or fiber particles cannot get into
hydraulic fluid and contaminate it.
To clean bearings, refer to TM 9-214.
Use clean rags dampened with cleaning compound (item 8, appendix C) to clean dust, dirt, and grease off of electrical
wiring harnesses and connectors. If parts are too dirty to wipe clean, dip them into cleaning compound, shake off excess,
and wipe clean with clean rags. To get dirt out of recessed area, use a stiff brush. Wiring harnesses and connectors must
be completely dry before use. Dry wiring harnesses and connectors with clean dry rags and allow to air dry. To speed up
drying time, use dry compressed air.
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