TURBINE WHEEL AND SHAFT

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL d. Carefully expand and remove the piston ring (Fig. 7) from the turbine wheel and shaft. INSPECTION Before cleaning, inspect all the components for signs of rubbing or other defects which might not be evident after cleaning. Submerge and soak all parts in a good metal cleaner. The cleaning solution should be agitated to do a satisfactory job, but special care should be taken to insure the parts do not strike each other. Never use a caustic solution for cleaning, as this will permanently damage certain parts. Use only a soft brush, plastic blade scraper or compressed air jet to remove deposits. Never use a wire brush or steel blade scraper for this purpose. Be sure all wheel blades are thoroughly cleaned, as any deposits left on the blades will affect balance. Clean all internal cavities of the center housing thoroughly with compressed air. Check both wheels of the rotor assembly for damaged or distorted vanes and for possible contact with their respective housings and air inlet. The spacing between the vanes and the contour must be uniform. Check for cracked, bent or damaged blades. Replace if necessary. Do not attempt to straighten blades. Inspect the turbine housing for cracks or excessive scoring in the outlet contour. Inspect the compressor housing for damage. On the DT-466 turbocharger, inspect the thrust washer and collar for wear or damage. Inspect the thrust spring in the back plate for wear or damage. This spring need not be removed unless damage is evident. TURBINE WHEEL AND SHAFT Inspect the bearing surfaces for excessive scratches and wear. If the shaft is only slightly scratched, it may be reused. Never grind or polish the shaft, as this will affect balance. Inspect piston ring groove walls for scoring. Minor scratches are acceptable. Check carefully for cracked, bent or damaged turbine blades. Do not attempt to straighten blades. BEARINGS Inspect for scratches or worn surfaces. Replace bearing if tin plate is worn off. CENTER HOUSING Inspect for worn or scored surfaces in bearing bores. CTS-4104 PRINTED IN UNITED STATES OF AMERICA Page 14

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