ENGINE DIVISION SERVICE MANUALELECTRICALFig. 12. Testing Armature for GroundsIf the commutator is worn, dirty or out-of-roundor the insulation is high, the commutator shouldbe turned down and under cut.3.FieldCoils- Check field coils for ground andopens with a test lamp.a.Grounds - With the field coil grounddisconnected, position one test prod on thefield frame and the other to the fieldconnector. If the lamp lights the field coilsare grounded and must either be replacedor repaired.b.Opens - If the test lamp does not light whenthe prods are connected to the ends of coilleads, the field coils are open.A pole shoe spreader and pole shoe screwdriver should be used if the field coils are to be removed.Extra caution should be taken in replacing the field coilsto prevent grounding or shorting when they are tightenedin place. If the pole shoe has a long lip on one side, itshould be assembled in the direction of armaturerotation.CLUTCH ASSEMBLIESFour kinds of clutches or motor drives(a heavy duty sprag, a Positork drive, an intermediateduty type and a splined drive) may be used on theenclosed shift lever heavy duty motors.The intermediate clutch may be either the spragtype or the four roll type. All four types are moved intomesh with the flywheel ring gear by action of thesolenoid. The pinion will remain engaged until starting isassured and the solenoid is interrupted.IntermediateDutySpragClutch1.Remove the lock wire, collar and spring fromsleeve assembly. Early design type cluthes areequipped with a spring stop and a second lockwire which must be removed after removing thespring.2.Remove the retainer ring and large washers. DONOT remove sleeve assembly or sprags fromshell assembly.3.Lubricate the sprags and saturate the felt washerwith No. 5W-20 oil. Heavier oil must not be used.4.Reassembly is the reverse of the disassembly.CGES-230 - Page 13
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
