CLEANING HYDROSTATIC SYSTEM CONTINUED
6. Make sure hydraulic system is clean so that charge pump will not cause new contamination in closed loop.
Clean hydraulic system as required. Oil cooler has internal passages that can trap and hold contaminants that
can cause a repeat failure. If filter bypass lamp is on, the cooler may need to be replaced.
CLEANING HOSES, TUBES, AND FITTINGS
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If available, use steam cleaner to clean hoses, tubes, and fittings and dry with
1. Fasten parts to rack as nearly vertical as possible to allow water to drain.
2. Clean exterior surfaces of parts thoroughly.
3. Clean interior surfaces of parts. Use hot water with soap solution first. Then use clean hot water to rinse.
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If steam cleaner does not have a soap injection system, spray an oil solvent into the parts.
This will dissolve oil film that holds contaminants inside parts. Then use clean hot water to
4. Fasten components to rack so that components can be flushed from opposite ends. Repeat steps 2 and 3.
5. Use compressed air to dry inside of each part. Dry parts from both ends to make sure that all water has been
6. Install caps or plugs in ends of each hose, tube, or fitting as soon as parts are dry to prevent entry of airborne
7. Remove caps or plugs from component only when component is in position on machine and connection is to
1. General. All components and parts must be carefully checked to determine if they are serviceable for reuse, if
they can be repaired, or if they must be scrapped.
2. Drilled and Tapped (Threaded) Holes.
a. Inspect for wear, distortion (stretching), cracks, or any other damage in or around holes.
b. Inspect threaded areas for wear, distortion, or evidence of cross-threading.
Mark all damaged areas for repair or replacement.
3. Metal Lines, Flexible Lines (Hoses), and Fittings.
a. Inspect lines for sharp kinks, cracks, bends, or dents.
b. Inspect flexible lines for fraying, evidence of leakage, or loose fittings or connectors.
Check all fittings and connectors for thread damage. Check for hex heads that are worn or rounded by
poorly fitting wrenches.
d. Mark all damaged material for repair or replacement.
a. Inspect all ferrous and nonferrous castings for cracks using a magnifying glass and strong light.
Particularly check areas around studs, pipe plugs, threaded inserts, and sharp corners. Replace all
b. Inspect machined surfaces for nicks, burrs, or raised metal. Mark damaged areas for repair or