GE GE752 manual Spin Seasoning Commutator Assembled On Armature, Commutator Resurfacing

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Vertical Drilling Motor, Type GE752, GEK±91584D

If necessary, tighten the appropriate cap bolts to obtain this parallel relationship between the face of the cap and the segments.

2.Remove ONE bolt. Clean and lubricate the bolt threads under the bolt head. Reassemble bolt, and torque to 97 lb.±ft.

3.Repeat Step 2 for remaining bolts, following the crisscross tightening sequence shown on Fig. 27.

4.Repeat the tightening sequence increasing the torque by 10% each time until a FINAL value of 145 lb.±ft. torque for all bolts is obtained.

5.Check the dimension between face of cap and segments to assure these surfaces are parallel within 0.020 in.

NOTE: Do not tack±weld the bolts to the com- mutator cap before spin seasoning or resurfac- ing operations are performed.

Refer to following sections for instructions to spin season and resurface the commutator.

Spin Seasoning

(Commutator Assembled On Armature)

A commutator seasoning cycle is required after com- mutator tightening operations have been performed.

Prior to spin±seasoning, dynamically balance the ar- mature to within 12 grams on the commutator end and 10 grams on the drive end. Refer to longitudinal section for balance weight locations (see Table 2 to determine the correct drawing).

To spin season the commutator, place the armature in a spin±seasoning stand and proceed as follows:

1.Heat the commutator to 155±165￿ C (312±330￿ F) in 60 minutes at 2940 rpm. Spin at 155±165￿ C (312±330￿ F) for 60 minutes at 2940 rpm. Cool to 50￿ C (122￿ F) maximum in 30 minutes at 2940 rpm.

2.Allow the commutator to cool, and grind cold. See ªCommutator Resurfacingº section.

3.Heat the commutator to 155±165￿ C (312±330￿

F)in 60 minutes at 2940 rpm. Spin at 155±165￿ C (312±330￿ F) for 30 minutes at 2940 rpm. Cool to 50￿ C (112￿ F) maximum in 30 minutes at 2940 rpm. Repeat for a total of 2 cycles.

4.Heat the commutator to 140±150￿ C (284±302￿

F)in 60 minutes at 2940 rpm, and check commu- tator smoothness at 2940 rpm.

5.Allow the commutator to cool, and grind cold. See the ªCommutator Resurfacingº section. Check commutator runout per the information in the DATA section. If the commutator is rough or has high bars, repeat the pressing, tightening, spin±seasoning and resurfacing procedures un- til the runout is within the limits specified in the DATA section.

6.Tack±weld the bolts to the commutator cap with bronze welding rod, GE±B50E37.

7.Refer to the ªTest After Repair (Armature)º sec- tion for the test voltage, and perform a High±Po- tential test on the armature windings.

Commutator Resurfacing

Prior to turning or grinding the commutator, be cer- tain there is sufficient stock so the commutator will not be turned or ground below the minimum permissible di- ameter.

Refer to the DATA section for the minimum permissi- ble commutator diameter dimension.

If the brush surface diameter will be less than the minimum permissible diameter after the resurfacing op- erations are performed, the commutator must be re- placed.

Grinding

1.Prior to grinding, true the shaft centers with re- spect to the bearing fits by scraping.

2.Place the armature in a lathe equipped with a grinding attachment or in a grinding machine.

Check the concentricity of the bearing fits. The TIR should not exceed 0.001 in.

3.Cover the armature windings to prevent entry of grinding dust and chips.

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Contents Vertical Drilling Motor Type GE752 ContentsGeneral Description IntroductionGEK±91584D, Vertical Drilling Motor, Type GE752 Model Differences Vertical Drilling Motor, Type GE752, GEK±91584DData Contd Model DifferencesCarbon Brushes Data ContdPole Bore Diameter measured at center of pole Motors Min Max Motor Ratings Continuous Max. HP Shunt UP Grounding Instructions Special Tools EquipmentGrease Tubes and Pipe Plugs Grounding Procedures FigOverhaul LubricationInspection Monthly Covers, Seals, LatchesBrushholders Fig Brush Spring Pressure Brushholder SleevesFlash Ring BrushesCommutator Creepage BandBasic Repairs Brush Replacement Brushholder ReplacementSEMI±ANNUALLY Installation Brushholder Clearance AdjustmentCommutator Resurfacing Hand Stoning Procedure Sanding ProcedureFixture Grinding Grinder InstallationCommutator GRINDER. E±18249 ±19771A GrindingTesting Before Disassembly Air Curing CommutatorBasic Overhaul Armature Removal From Frame DisassemblyMegohmmeter Test Bar±To±Bar Resistance TestCOMMUTATOR±END Bearing Pilot Longitudinal D732922 CHG. N. E±28621D Models See , Description Puller Tools 41D731569 CHG . E±14383C Puller TOOLS. E±18155A Models US1, AUT Longitudinal D735357, CHG. A. E±37949B Models See Table Steam Cleaning CleaningArmature Vapor DegreasingAnti±Friction Bearings/Shaft Tapers/Bearing Fits Bearing InspectionCommutator Armature Shaft InspectionMotor Frame Armature Insulation 41D731545 CHG. F. E±18156A See Note Lubrication of Bolts BrushholdersConnection Diagram 493A210 CHG . E±39092B Diameter Creepage Band ReplacementRewinding Armature Riser WidthTorque Wrench Acceptable Method ProcedureCommutator Tightening Hydraulic Press Preferred MethodCommutator Resurfacing Spin Seasoning Commutator Assembled On ArmatureTo Change Motor Direction TurningConnection Diagram 41A330278, CHG . E±38055B Connection Diagram 41A330179, CHG. A. E±37950A ±4270B RakingRewound Armature Resistance MeasurementTest After Repair Armature High Potential Test Used ArmatureMotor Frame Field Coil ReplacementCoil Installation Procedure for New Coil±Pole AssemblyCoiled Frame Assembly 41D732353 CHG. N. E±39094A Models See , Coiled Frame Assembly 41D732345 CHG. V. E±39095A BOX Ground A1 and A2 View AT E Cables with P65 Coiled Frame Assembly 41D735440, CHG. A. E±38056B Description Magnet Frame Coiled Frame Assembly 41D735343, CHG. C. E±37951C Hardened Washer 1 1/4 Gas Torch Brazing Brazing Coil TerminalsFlood Dipping Coiled Frame Test After RepairCoiled Frame Without Armature Reassembly Balancing ArmatureVarnish Treatment Armature All Models Except US2, UP6, AUT2 and AUP5 Armature BearingsDrive±End Bearing Figs , 35, 36 Commutator±End BearingDRIVE±END Bearing ASSEMBLY. E±18166E Models US2, UP6, AUT2 and AUP5 DRIVE±END Bearing ASSEMBLY. E±39301DRIVE±END Bearing Assembly 41B537821, CHG. B. E±37952B Models UP and AUP Armature Assembly Into FrameCOMMUTATOR±END Bearing Assembly 41B532745 CHG. F. E±39090A COMMUTATOR-END Bearing Assembly 41B538068 CHG . E-39300 Checking Internal Clearance Brush Installation HUB Mounting Hub FittingHub Mounting Testing After Overhaul Testing Series MachinesModels 5GE752AUP, AUT Unventilated Testing Shunt Machines Models 5GE752UP and USMotor Operation Ventilated 2300 cfm at 7.6 in. H2O at Commutator ChamberShipping Cleaning and SlushingRemoving Armature Locking Arrangement Locking the Armature For ShipmentPreparation of BOX SkiddingProtection ArmaturesStorage Placing Into Storage Boxing the ArmatureShipping BOX with Armature Less COVER. E±3784 Removing from StorageVertical Drilling Motor, Type GE752, GEK±91584D OUTLINE, UP and AUP 41E903631 CHG. H. E±28755B Hole Grease Vent Tube Grease Tube Holes REF OUTLINE, US1, AUT 41E903745, CHG. A. E±37954B ºDº ºBº Vertical Drilling Motor, Type GE752, GEK±91584D GE Transportation Systems
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