GE GE752 manual Flood Dipping Coiled Frame, Test After Repair, Coiled Frame Without Armature

Page 55

Vertical Drilling Motor, Type GE752, GEK±91584D

Flood Dipping Coiled Frame

After field coils have been repaired or replaced and electrical tests completed, insulate the coiled frame by flood dipping in GE±8001 varnish. See Table 4, Page 55, for varnish viscosity limits.

Varnish may be thinned, as necessary, with Solves- so* No. 100 thinner. Agitate varnish for 15 minutes be- fore dipping frame.

1.Be sure all coil connections are made and insu- lated, and all cables and ties for cables and con- nection straps are in place. Tie cable ends above the varnish level.

2.Coat all machine±fit surfaces with GE±271 black varnish or stripping compound and plug bolt holes with dummy bolts.

3.Heat the coiled frame to 40±80 C (104±176 F) and dip the frame drive end down (with all coil connections covered) for at least 15 seconds. Drain and remove the frame from the varnish. Al- low the frame to drain for at least 5 minutes in a vertical position, drive end down.

4.Bake the frame in a pre±heated oven at 150 C (302 F) for 30 minutes, minimum.

5.Clean the varnish from machined surfaces and unplug the tapped holes.

TEST AFTER REPAIR

(Coiled Frame Without Armature)

1.Pass 24.0 amperes(60 Hz current) through the exciting (series) field and read the voltage drop.

Minimum Volts

13.1

Maximum Volts . . . . . . . . . . . . . . . . . . . . . . 15.6

2.Pass 24.0 amperes (60 Hz current) through the commutating (CP) field and read the voltage drop.

For Non±Magnetic retainers:

*Standard Oil Co. of Pa.

TABLE 4

VARNISH VISCOSITY CHART FOR

DIPPING COILED FRAME

NOTE: When necessary, use Solvesso No. 100 to thin var- nish.

GE NO. 8001 VARNISH

NO. 3 ZAHN CUP

	70
	60
	50
TIME ± SECONDS	40
TIME ± SECONDS	30
	30
	20
	10
	0	10	20	30	40	50	60
	0	10	20	30	40	50	60

TEMP. DEGREES C

FIG. 33. FIELD COIL POLARITY CHECK. E±888A.

55

Image 55

Contents Vertical Drilling Motor Type GE752 ContentsIntroduction General DescriptionGEK±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 LubricationCovers, Seals, Latches Inspection MonthlyBrushholders Fig Brush Spring Pressure Brushholder SleevesFlash Ring BrushesCommutator Creepage BandBrushholder Replacement Basic Repairs Brush ReplacementSEMI±ANNUALLY Brushholder Clearance Adjustment InstallationCommutator Resurfacing Hand Stoning Procedure Sanding ProcedureFixture Grinding Grinder InstallationCommutator GRINDER. E±18249 ±19771A GrindingAir Curing Commutator Testing Before DisassemblyBasic 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 InspectionArmature Shaft Inspection CommutatorMotor 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 TerminalsTest After Repair Flood Dipping Coiled FrameCoiled Frame Without Armature Balancing Armature ReassemblyVarnish 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 Fitting HUB MountingHub Mounting Testing Series Machines Testing After OverhaulModels 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