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TYPICAL FAILURES
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INSTALLATION - TM-5-4210-230-14P-1_956
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 PROPELLER SHAFT REBUILDING DRIVESHAFTS BALANCING The   rebuilding   of   a   driveshaft   assembly   usually consists  of  replacing  worn  journal  cross  and  bearings  with  a new  kit.    These  kits  replace  the  part  of  a  driveshaft  most subject  to  wear  in  operation.    The  slight  off-center  condition present in the journal cross assemblies makes it desirable to balance the assembly after installing new journal and bearing kits. Generally,  unbalance  resulting  after  installation  of  a journal and bearing kit is equivalent to the unbalance existing after straightening the shaft.  If balancing cannot be done, it is advisable  to  check  assembly  for  smooth  operation  in  vehicle before it is put into operation. It is sometimes necessary to revise driveshaft lengths when rebuilding a vehicle.  This job requires proper facilities to produce a quality assembly.  It is necessary to properly assemble fittings into the tube and straighten, before welding, to be sure parts are centralized.  This can be done by mounting shaft assembly on center and straightening at fittings until ends of tube run concentric within about .12 mm (.005") TIR.  The welding of the tube in the fittings must provide for adequate strength and prevent distortion which could cause excessive run-out.  It is often desirable to tack weld and recheck for run-out before proceeding with final weld.  After welding, the entire driveshaft should be straightened to the following limits: (See Fig.  35) .12 mm (.005") TIR On shaft neck .38 mm (.015") TIR On ends of tubing 76.2 mm (3") from welds .25 mm (.010") TIR In center of tube These run-outs should be taken with entire driveshaft assembly   mounted   on   master   attaching   flanges   or   yokes, selected for dynamic balance to eliminate as much unbalance as possible. During balancing, the driveshaft again should be mounted on these selected flanges or yokes. Fig.  35 CTS-2730  Page 18 PRINTED IN UNITED STATES OF AMERICA

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