Hardware and threaded parts
Install helical thread inserts when inside threads in castings are stripped, damaged or not capable of withstanding specified torque.
Replace bolts, nuts, studs, washers, spacers and small common hardware if missing or in any way damaged. Clean up or repair minor thread damage with a suitable thread chaser.
Replace all damaged or missing lubrication fittings.
Use Teflon pipe sealant on pipe fitting threads.
Wiring, hoses and lines
Replace hoses, clamps, electrical wiring, electrical switches or fuel lines if they do not meet specifications.
Instruments and gauges
Replace broken or defective instruments and gauges. Replace dials and glass that are so scratched or discolored that reading is difficult.
Bearings
Anti-friction bearings must be handled in a special way. To keep out dirt and abrasives, cover the bearings as soon as they are removed from the package.
Wash bearings in a non-flammable cleaning solution. Knock out packed lubricant inside by tapping the bearing against a wooden block. Wash bearings again. Cover bearings with clean material after setting them down to dry. Never use compressed air to dry bearings.
Coat bearings with clean oil. Wrap bearings in clean paper.
Be sure that the chamfered side of the bearing always faces the shoulder (when bearings installed against shoulders). Lubricate bearings and all metal contact surfaces before pressing into place. Only apply pressure on the part of the bearing that makes direct contact with the mating part. Install bearings with numbered side facing out.
Always use the proper tools and fixtures for removing and installing bearings.
Bearings do not usually need to be removed. Only remove bearings if necessary.
Bushings
Do not remove a bushing unless damaged, excessively worn or loose in its bore. Press out bushings that must be replaced.
When pressing or driving bushings, be sure to apply pressure in line with the bushing bore. Use a bearing/bushing driver or a bar with a smooth, flat end. Never use a hammer to drive bushings.
Inspect the bushing and the mated part for oil holes. Be sure all oil holes are properly aligned.
Gaskets
Always discard gaskets after removal. Replace with new gaskets. Never use the same gasket twice. Be sure that gasket holes match up with holes in the mating part.
Lip type seals
Lip seals are used to seal oil or grease and are usually installed with the sealing lip facing the contained lubricant. Seal orientation, however, may vary under different applications.
Seals should not be removed unless necessary. Only remove seals if required to gain access to other parts or if seal damage or wear dictates replacement.
Leaking oil or grease usually means that a seal is damaged. Replace leaking seals to prevent overheated bearings.
Always discard seals after removal. Do not use the same seal twice.
О-Rings (preformed packings)
Always discard о-rings after removal. Replace with new o-rings. To prevent leaks, lubricate the о-rings before installation. Apply the same type of lubricant as that being sealed. Be sure that all gasket, о-rings and seal mating surfaces are thoroughly clean before installation.
Gears
Always check gears for damaged or worn teeth.
Lubricate mating surfaces before pressing gears on shafts.
Shafts
If a shaft does not come out easily, check that all nuts, bolts or retaining rings have been removed. Check to see if other parts are in the way before using force.
Shafts fitted to tapered splines should be very tight. If shafts are not tight, disassemble and inspect tapered splines. Discard parts that are worn. Be sure tapered splines are clean, dry and free of burrs before putting them in place. Press mating parts together tightly.
Clean all rust from the machined surfaces of new parts.
Part replacement
Always replace worn or damaged parts with new parts.
Cleaning
Part protection
Before cleaning, protect rubber parts (such as hoses, boots and electrical insulation) from cleaning solutions. Use a grease-proof barrier material. Remove the rubber part if it cannot be properly protected.
Cleaning process
Any cleaning method may be used as long as it does not result in parts damage. Thorough cleaning is necessary for proper parts inspection. Strip rusted paint areas to bare metal before repainting.
Rust or corrosion removal
Remove rust and corrosion with a wire brush, abrasive cloth, sand blasting, vapor blasting or rust remover. Use buffing crocus cloth on highly polished parts that are rusted.