GE GE752 manual Motor Frame Field Coil, Replacement, Coil Installation, Coil Removal

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		Vertical Drilling Motor, Type GE752, GEK±91584D
	MOTOR FRAME FIELD COIL	Remove the pole bolts and the coil±pole assem-
	REPLACEMENT	bly from the magnet frame.
	Refer to Table 2, Page 20, to determine the correct	3. Mark any shims for reassembly with the corre-
		sponding pole when the coil(s) is installed in the
	coiled frame assembly drawing for the machine being	frame.
	repaired.	Coil Installation
	Coil Removal

		Procedure for New Coil±Pole Assembly

1.Remove terminal insulation and disconnect coil leads. Use a gas torch or brazing tongs to sepa- rate brazed connections. When using brazing tongs use low voltage and high a±c current to heat coil connections.

WARNING: Safety glasses and leather gloves must be worn at all times during brazing oper- ations to protect personnel from physical harm.

NOTE: If a gas torch is used, coil insulation must be protected from heat by a non±flam- mable heat absorbent.

1.Pack absorbent around the insulation near the connection and over adjacent coils.

2.Make sure all exposed insulation is covered with a thick layer of absorbent, then heat and separate the coil connections.

2.Heat the coiled frame in an oven at 150 C (302

F)for four hours to soften the varnish so pole bolts can be removed.

NOTE: Install any exciting coils and braze their connections before installing commutating coils.

1.Before installing any coil and pole, clean the pole contact surface on the frame and the pole piece mounting surface.

2.Install the new pole and coil in the frame with any shims that were on the damaged coil. Use new washers under bolt heads. Lubricate the bolt heads, threads and washers and draw the pole bolts moderately tight.

3.Refer to Table 2, Page 20, to determine the cor- rect coiled frame assembly drawings. All coil connections must be brazed with silver solder, GE±B20A6. Use two pieces of solder (0.010 x 1 in. x 1 in.) between terminal surfaces and braze terminals as follows:

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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 EquipmentOverhaul Grounding Procedures FigLubrication Grease Tubes and Pipe PlugsInspection Monthly Covers, Seals, LatchesBrushholders Fig Brush Spring Pressure Brushholder SleevesCommutator BrushesCreepage Band Flash RingBasic 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 Megohmmeter Test DisassemblyBar±To±Bar Resistance Test Armature Removal From FrameCOMMUTATOR±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 CleaningAnti±Friction Bearings/Shaft Tapers/Bearing Fits Vapor DegreasingBearing Inspection ArmatureCommutator Armature Shaft InspectionMotor Frame Armature Insulation 41D731545 CHG. F. E±18156A See Note Lubrication of Bolts BrushholdersConnection Diagram 493A210 CHG . E±39092B Rewinding Armature Creepage Band ReplacementRiser Width DiameterCommutator Tightening ProcedureHydraulic Press Preferred Method Torque Wrench Acceptable 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 RakingTest After Repair Armature High Potential Test Resistance MeasurementUsed Armature Rewound ArmatureCoil Installation ReplacementProcedure for New Coil±Pole Assembly Motor Frame Field CoilCoiled 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 Drive±End Bearing Figs , 35, 36 Armature BearingsCommutator±End Bearing All Models Except US2, UP6, AUT2 and AUP5DRIVE±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 Motor Operation Testing Shunt Machines Models 5GE752UP and USVentilated 2300 cfm at 7.6 in. H2O at Commutator Chamber UnventilatedRemoving Armature Locking Arrangement Cleaning and SlushingLocking the Armature For Shipment ShippingProtection SkiddingArmatures Preparation of BOXStorage 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