GE GE752 manual Commutator Tightening, Procedure, Hydraulic Press Preferred Method

Page 38

GEK±91584D, Vertical Drilling Motor, Type GE752

NOTE: Before rewinding the armature, first

2. Torque the commutator bolts by one of the fol-

check the shaft pinion and bearing fits to deter-

 

lowing methods.

mine whether or not shaft replacement is re-

 

 

quired. See Table 2 to determine the correct

Hydraulic Press (Preferred Method)

shaft drawings.

1.

Clean the front face of the cap and the segments,

 

The armature can be rewound using a GE Co. Sup-

 

Fig. 25. Remove ONE bolt at a time, and lubri-

 

cate the bolt threads and under the bolt head.

ply Kit, Part 41D730545G8, and the information

 

 

See Lubrication of Bolts section. Follow the se-

supplied in the kit.

 

 

quence shown on Fig. 27 for bolt removal. Reas-

 

 

NOTE: After the armature is rewound, the arma-

 

semble bolt and tighten to the initial breakaway

ture coil leads must be TIG welded to the com-

 

torque value.

mutator risers, the armature must be Vacuum

2.

Using a depth micrometer, measure the distance

Pressure Impregnated, and the commutator

 

(X in Fig. 25) between the face of the cap and the

must be cleaned and polished.

 

 

segments at four points, 90 degrees apart. The

 

 

Commutator Tightening

 

face of the cap and the segments should be par-

 

allel within 0.020 in. If necessary, tighten the ap-

 

 

If the commutator requires tightening, commutator

 

propriate cap bolts to obtain this parallel relation-

 

ship between the face of cap and the segments.

assembly pressure can be restored at overhaul by per-

 

 

 

forming a commutator tightening procedure; however, it

3.

Place the armature in a vertical press. Position

is necessary that spin±seasoning and resurfacing oper-

 

ball and socket tool (Part 41C685080G1) and

ations be performed after the commutator is tightened.

 

 

crow±foot pressing fixture (Part 41C685430G1)

 

 

Before proceeding to tighten a loose commutator, it

 

on the commutator, and apply 70 tons pressure

must first be determined whether or not the brush±sur-

 

at the diameter shown on Fig. 26.

face diameter of the commutator will be larger than the

4. Tighten the commutator bolts to 145 lb.±ft.

minimum permissible diameter after the commutator is

resurfaced.

 

torque in a crisscross sequence, Fig. 27. Tighten

If the brush±surface diameter is calculated to be

 

the bolts twice in this sequence, then tighten

 

bolts once±around at 145 lb.±ft. torque.

smaller (after resurfacing) than the minimum

 

 

 

permissible diameter, listed in the DATA section, the

NOTE: The specified torque values have no sig-

commutator must be replaced.

nificance unless the bolts are lubricated.

After a long period of service, the mica insulation

5.

Check the dimension between cap face and seg-

 

ments at four locations, 90 degrees apart, to as-

may relax, due to temperature cycling, and relieve com-

 

 

sure surfaces are still parallel within 0.020 in.

mutator assembly pressure. This could result in a loose

 

 

 

commutator (with raised bars), or an out±of±round com-

Torque Wrench (Acceptable Method)

mutator.

 

 

 

In the absence of a suitable press, bolts may be tight-

The assembly pressure can be restored by tighten-

ened with a torque wrench adjusted to apply the indi-

ing the commutator bolts. This must be done before un-

cated torque to each bolt.

dertaking any resurfacing operation on the commutator.

1.

Clean the front face of the cap and the segments.

 

Procedure

 

Using a depth micrometer, measure the distance

 

(X in Fig. 25) between the face of the cap and the

 

 

 

 

segments at four points, 90 degrees apart. The

1. Chip the weld from the commutator bolt heads to

 

face of the cap and the segments should be par-

free bolts from the cap.

 

allel within 0.020 in.

38

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Contents Contents Vertical Drilling Motor Type GE752GEK±91584D, Vertical Drilling Motor, Type GE752 General DescriptionIntroduction Vertical Drilling Motor, Type GE752, GEK±91584D Model DifferencesContd Model Differences DataData Contd Carbon BrushesPole Bore Diameter measured at center of pole Motors Min Max Motor Ratings Continuous Max. HP Shunt UP Special Tools Equipment Grounding InstructionsLubrication Grounding Procedures FigOverhaul Grease Tubes and Pipe PlugsBrushholders Fig Inspection MonthlyCovers, Seals, Latches Brushholder Sleeves Brush Spring PressureCreepage Band BrushesCommutator Flash RingSEMI±ANNUALLY Basic Repairs Brush ReplacementBrushholder Replacement Commutator Resurfacing InstallationBrushholder Clearance Adjustment Sanding Procedure Hand Stoning ProcedureGrinder Installation Fixture GrindingCommutator GRINDER. E±18249 Grinding ±19771ABasic Overhaul Testing Before DisassemblyAir Curing Commutator Bar±To±Bar Resistance Test DisassemblyMegohmmeter 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 Cleaning Steam CleaningBearing Inspection Vapor DegreasingAnti±Friction Bearings/Shaft Tapers/Bearing Fits ArmatureMotor Frame CommutatorArmature Shaft Inspection Armature Insulation 41D731545 CHG. F. E±18156A See Note Brushholders Lubrication of BoltsConnection Diagram 493A210 CHG . E±39092B Riser Width Creepage Band ReplacementRewinding Armature DiameterHydraulic Press Preferred Method ProcedureCommutator Tightening Torque Wrench Acceptable MethodSpin Seasoning Commutator Assembled On Armature Commutator ResurfacingTurning To Change Motor DirectionConnection Diagram 41A330278, CHG . E±38055B Connection Diagram 41A330179, CHG. A. E±37950A Raking ±4270BUsed Armature Resistance MeasurementTest After Repair Armature High Potential Test Rewound ArmatureProcedure for New Coil±Pole Assembly ReplacementCoil Installation 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 Brazing Coil Terminals Gas Torch BrazingCoiled Frame Without Armature Flood Dipping Coiled FrameTest After Repair Varnish Treatment Armature ReassemblyBalancing Armature Commutator±End Bearing Armature BearingsDrive±End Bearing Figs , 35, 36 All Models Except US2, UP6, AUT2 and AUP5DRIVE±END Bearing ASSEMBLY. E±18166E DRIVE±END Bearing ASSEMBLY. E±39301 Models US2, UP6, AUT2 and AUP5DRIVE±END Bearing Assembly 41B537821, CHG. B. E±37952B Armature Assembly Into Frame Models UP and AUPCOMMUTATOR±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 Ventilated 2300 cfm at 7.6 in. H2O at Commutator Chamber Testing Shunt Machines Models 5GE752UP and USMotor Operation UnventilatedLocking the Armature For Shipment Cleaning and SlushingRemoving Armature Locking Arrangement ShippingArmatures SkiddingProtection Preparation of BOXBoxing the Armature Storage Placing Into StorageRemoving from Storage Shipping BOX with Armature Less COVER. E±3784Vertical 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