GE GE752 manual Brushholder Sleeves, Brush Spring Pressure

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Vertical Drilling Motor, Type GE752, GEK±91584D

3.Continue tapping as described in Step 1 until the 0.753 dimension falls between 0.751 and 0.755.

4.If, due to excessive pounding, the inside dimen- sion becomes less than 0.751 in., file back to size with a fine mill file.

Additional repairs can be made to restore damaged brushholder bodies. Brushholder damage is fairly typi- cal when flashovers have occured, resulting in some burning or melting of metal at the corners of the brush- holder. Metal thus removed can be restored according to the following instruction, unless more than 1/4 in. buildup of metal is required in the affected area, in which case the brushholder should be scrapped. Proceed as follows:

1.Thoroughly clean the affected area by wire brushing, and grind off any metal flow resulting from a flashover.

2.Apply a suitable brazing flux such as GE±A10B15 to the area to be built up.

3.Insert a carbon brush into the brushholder to pre- vent the brazing material from flowing into the carbonway.

4.Using a brazing torch and a 1/16 in. diameter brass brazing rod, puddle in sufficient metal to restore the metal that had been removed.

5.Check the carbonway for size with the ªGo/No± Goº gage after the brushholder has cooled to room temperature.

6.Resize as required using the preceding method.

Brushholder Sleeves

spots caused by flashovers. Replace any damaged brushholder or one having a damaged sleeve.

WARNING: MEK is a volatile solvent. The fumes should not be inhaled. Use only in a well±venti- lated area and take adequate precautions to pro- tect eyes, skin and hands.

NOTE: Never paint these sleeves. Periodically wipe them clean with a dry cloth or a cloth dipped in an approved non±oily cleaning sol- vent.

Inspect the brushholder cables and make sure all terminal bolts and all brushholder clamp bolts are tight.

Brush Spring Pressure

Lift the brush pressure fingers to the ªtoggled±upº position, Fig. 5, and check for free movement of the spring assembly.

Inspect the brush springs for obvious failure or dam- age. Check brush±spring pressure by comparing spring pressure with a spring known to be good. Refer to the DATA section for brush spring±pressure value.

BRUSH PRESSURE FINGER (IN TOGGLED±UP POSITION)

TEFLON

PRESSURE

SLEEVES

SPRING

 

 

CARBONWAY

BRUSH±SHUNT

TERMINAL

SCREWS

Use a clean, lintless cloth and wipe dirt and grease from the Teflon* brushholder sleeves, Fig. 5. If neces- sary, use a cleaner such as MEK (methyl ethyl ketone) to clean the sleeves. Inspect sleeves for cracks and thin

FIG. 5. BRUSH SPRING ARRANGEMENT.

E±18963.

*Product of E.I. duPont de Nemours Company.

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Contents Vertical Drilling Motor Type GE752 ContentsGEK±91584D, Vertical Drilling Motor, Type GE752 General DescriptionIntroduction 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 LubricationBrushholders Fig Inspection MonthlyCovers, Seals, Latches Brush Spring Pressure Brushholder SleevesFlash Ring BrushesCommutator Creepage BandSEMI±ANNUALLY Basic Repairs Brush ReplacementBrushholder Replacement Commutator Resurfacing InstallationBrushholder Clearance Adjustment Hand Stoning Procedure Sanding ProcedureFixture Grinding Grinder InstallationCommutator GRINDER. E±18249 ±19771A GrindingBasic Overhaul Testing Before DisassemblyAir Curing Commutator 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 InspectionMotor Frame CommutatorArmature Shaft Inspection 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 TerminalsCoiled Frame Without Armature Flood Dipping Coiled FrameTest After Repair Varnish Treatment Armature ReassemblyBalancing 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 MountingHub Fitting Models 5GE752AUP, AUT Testing After OverhaulTesting Series Machines 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