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Fig.  4 - Drawing of the blower and motor assembly showing the "span"
Fig.  5 - Typical direct drive turbo blower.

TM-5-3895-374-24-1 Paving Machine Bituminous Material: Crawler Mounted Diesel Engine Driven Manual
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TM 5-3895-374-24-1 GP255FH D.   MAINTENANCE 1 Filters Periodically clean all filters by accomplishing the following. A. Remove the filter by releasing the restraining screw located on the end of the filter. B. Clean the filter with a suitable solvent. C. Allow the filter to dry thoroughly. D. Dip the new filter in oil and allow it to drain thoroughly Use SAE 10-30 oil when ambient temperatures are below 700F and SAE 30-50 oil when temperatures are above 70aF. WARNING If   flammable   solvents   are   used   to   clean   a   filter   element   for   a   blower   supplying   air   for combustion, be sure the element is completely dry before oiling. Make sure all excess oil has drained from the element before reinstalling it on the blower. Combustible vapors drawn into this type of air system can cause serious explosions. E.    Reinsert the filter in the mounting collar Securely fasten In place Ensure that the supporting leg (if present) is properly positioned. 2. Impeller Removal/Replacement IMPORTANT Upon receipt,  carefully  check  the  replacement  impeller  to  be  sure  no  damage  has  occurred during  shipment  or  handling  Any  changes  made  to  the  turbo  blower  assembly  could  cause detectable   differences   in   vibration   levels.   However,   since   each   impeller   is   centrifugally balanced   before   shipment   to   Quality   Grade   G6.3   of   the   ISO   Standard   1940,   impeller replacement  In  itself  should  not  cause  concern.  If  excessive  vibration  level  is  suspected before   or   after   impeller   replacement,   obtain   quantitative   peak-to-peak   displacement   or velocity vibration readings at the motor bearings prior to consulting the factory. If it should become necessary to inspect and/or replace the impeller, the following procedures should be followed. The numbers in parentheses refer to items In the drawing. (page 3-543)







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