(4)With an ohmmeter, test for continuitybe-tween contact 5 and contact 6 withCKTBRK switch(65) in the CLOSE and center position and no contin-uity with the CKT BRK switch in the OPENposition.(5)With an ohmmeter, test for no continuitybetween contact 2 and contact 3 with CKTBRK switch(65)in CENTER and OPENposition, and continuitywith CKT BRK switch in CLOSE position.(6) If the CKT BRK switch does not operatecorrectly, replace it.(7)Reconnect leads.b. Replacement. Replace CKT BRKswitch (65)as rollows:(1) Removal.(~)Tag leads and remove screws and lock-washers which secure leads to CKTBRKswitch.~) Remove CKT BRK switch mountinghardware and remove CKT BRKswitch.(2)Installation. Install CKTBRKswitch (65)using removal steps in reverse order. Remove tags.3 - 1 1 8 . E n g i n e P r i m e r S w i t c h .See ( 6 3 , f i g . 3 - 1 8 ) and proced as follows:CAUTIONOpen DC CONTROL CIRCUITBREAKER ( 2 7 , f i g . 3 - 1 7 )before testing or replacingENGINE PRIMER switch.a. TestiTest ENGINE PRIMER switch ( 6 3 ,f i g . 3 - 1 8 as follows:(1) Gain access to the rear of the controlcubicle panel ( 9 6 ) .(2) Remove screw and lockwa.sher which securea lead to the ENGINE PRIMER switch.(3) Check that ENGINE PRIMER switch isspring loaded to “OFF” position. With an ohmmeter,test ENGINE PRIMER switch for opencircuit withENGINE PRIMER switch in “OFF” position.(4) Test ENGINE PRIMER switch for a closedcircpit with ENGINE PRIMER switch held in “ON’posit ion.(5) Reconnect lead using screw and lockwasher.b. Replacement.Replace ENGINE PRIMERswi~ch (63) as follows:(1) Removal.(~) Tag both leads and remove two screwsandlockwasherswhich secure leads to the ENGINEPRIMER switch.(Q) Remove mounting hardware which sec -ures ENGINE PRIMER switch (63)to panel (96)andremove ENGINE PRIMER switch.(2) Installation.Install ENGINE PRIMERswitch (63)using removal steps in reverse order.Remove tags.3 - 1 1 9 . E n g i n e S t a r t - R u n - S t o p S w i t c h .See ( 6 4 , f i g . 3 - 1 8 ) and proceed as follows:CAUTIONOpen DC CONTROL CIRCUITBREAKER ( 2 7 , f i g . 3 - 1 7 )before testing or replacingSTART-RUN-STOP switch.a. Testing. Test the engine START- RUN-STOPswi~ch ( 6 4 , f i g . 3 - 1 8 ) as follows:(1)Gain access to the rear of the controlcubicle panel (96).(2)Check spring return from START to RUNposition.(3) Tag and remove leads from the engineSTART -RUN-STOPswitch and testthe switch forcontinuity as follows:(~Place engine START -RUN-STOPswitch toSTART position and withan ohmmetertestfor con-tinuity (closed contacts) between contacts 2 to 3;contacts 5 to 6; coutacts 8 to 9: and contacts 11 to12.(b)Place engine START -RUN-STOP switch toRUNposition, test forcontinuity between contacts2 to 3 and contacts 8 to 9.(c) Check for opencircuit between contacts5 to 6. an~between contacts 11 to 12.(~) Place engine START -RUN-STOP switch toSTOP position and testfor open circuit betweenall contacts.(~) If engine START-RUN-STOP switch doesnot operate correctly, replace it.@ Reconnect leads as tagged and removetags .~. Replacement.Replace defective engine START-RUN-STOP switch as follows:(1) Removal.(q)Tag and remove leads from the engineSTART -RUN-STOP switch.(b) Remove mounting hardware which se-cures eng~ne START-RUN-STOP switch (64) to panel(96) and remove switch.3 - 4 3
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