SERVICE MANUALREBUILDING DRIVESHAFTSBALANCINGThe rebuilding of a driveshaft assembly usuallyconsists of replacing worn journal cross and bearingswith a new kit. These kits replace the part of a driveshaftmost subject to wear in operation. The slight off-centercondition pre-sent in the journal cross assemblies makesit desirable to balance the assembly after installing newjournal and bearing kits.Generally, unbalance resulting after installation of ajournal and bearing kit is equivalent to the unbalanceexisting after straightening the shaft. If balancing cannotbe done, it is advisable to check assembly for smoothoperation in vehicle before it is put into operation.It is sometimes necessary to revise drive-shaftlengths when rebuilding a vehicle. This job requiresproper facilities to produce a quality assembly. It isnecessary to properly assemble fittings into the tube andstraighten, before welding, to be sure parts arecentralized. This can be done by mounting shaftassembly oncenter and straightening at fittings until ends of tube runconcentric within about .12 mm (.005"1) TIR. Thewelding of the tube in the fittings must provide foradequate strength and prevent distortion which couldcause excessive runout. It is often desirable to tack weldand recheck for runout before proceeding with final weld.After welding, the entire driveshaft should bestraightened to the following limits: (See Fig. 35).12 mm (.005") TIR On shaft neck.25 mm(.010") TIROn ends of tubing 38.1 mm(1-1/2") from welds.38 mm (.015") TIR In center of tubeThese runouts should be taken with entire driveshaftassembly mounted on master attaching flanges or yokes,selected for dynamic balance to eliminate as muchunbalance as possible. During balancing, the driveshaftagain should be mounted on these selected flanges oryokes.Fig. 35 Chock Straightness of Shaft With Dial IndicatorAt Points 1- 2 - 3 - 4.1 - .005"3 - .015"2 - .010"4 - .010"CTS-4017 - Page 18PRINTED IN UNITED STATES OF AMERICA
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