GE GE752 manual Air Curing Commutator, Basic Overhaul, Testing Before Disassembly

Page 19

Vertical Drilling Motor, Type GE752, GEK±91584D

WARNING: When using compressed air for

3.

Increase the machine speed to approximately

 

900 rpm and blow air on the commutator until the

cleaning purposes, flying debris and particles

 

 

sparking stops.

may present a hazard to personnel in the im-

 

4.

Increase the speed until full speed is reached (do

mediate area. Personnel should be provided

with, and trained in the use of, personal pro-

 

not exceed 1000 rpm) and continue to blow air on

 

the commutator until all sparking stops.

tective equipment as specified by applicable

 

5.

Stop the machine.

federal or state safety regulations.

 

6.

Disconnect external power supply to machine.

Air Curing Commutator

 

Make all necessary mechanical and electrical

 

 

changes to restore the machine to service.

After the commutator has been sanded, stoned or ground and blown clean, it should be air cured as fol- lows:

1.Rotate the armature slowly with the same source of power used for sanding, stoning or grinding.

2.Use a rubber air±hose with the nozzle removed and sweep the commutator surface with 70 psi air pressure.

WARNING: Observe all the following safety precautions to avoid injury.

1.Remove all metal fittings from the air hose or, if impossible to remove, insulate the fitting.

2.Be certain an operator is stationed at the power±supply control to quickly remove power from the machine should an emer- gency arise.

3.Wear rubber±insulated gloves and goggles while air curing. Stand on an in- sulated platform.

4.Avoid contact with the cable terminals.

WARNING: Do not come into close proximity of an energized motor during the cleaning pro- cess. The armature commutator and brush rig- ging have a high electrical charge which could cause serious injury or death. Always use a hose tip that is an electrical non±conductor when cleaning with air.

7.Use a clean cloth and wipe off the brushholders, creepage band and accessible surfaces in the commutator chamber.

8.Brushholder Clearance ± Install the brushholder previously removed and check and adjust as re- quired the brushholder±to±commutator clear- ance on all brushholders. See previous Brush- holder Replacement and Brushholder Clearance Adjustment sections for instructions to install the brushholder, and to adjust brushholder clear- ance.

9.Installing Brushes ± Refer to BASIC REPAIRS, Brush Replacement section, and install serviceable or new brushes per instructions listed.

10.Vacuum interior of commutator chamber.

BASIC OVERHAUL

NOTE: Be sure to use the correct drawings for the machine being overhauled. Refer to Table 2 on page 20 to determine the correct drawing.

It is recommended that a basic overhaul be per- formed every two years, or 18,000 hours. The time inter- val between overhauls may vary, depending on the con- dition of the machine and the severity of service.

The following basic overhaul procedures include in- structions to disassemble, clean, inspect, repair, reas- semble and test the machine.

TESTING BEFORE DISASSEMBLY

Perform the following tests prior to disassembly of the machine:

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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
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