(4) With an ohmmeter, test for continuity be-
tween contact 5 and contact 6 with CKT BRK switch
(65) in the CLOSE and center position and no contin-
uity with the CKT BRK switch in the OPEN position.
(5) With an ohmmeter, test for no continuity
between contact 2 and contact 3 with CKT BRK switch
(65) in CENTER and OPEN position, and continuity
with CKT BRK switch in CLOSE position.
(6) If the CKT BRK switch does not operate
correctly, replace it.
(7) Reconnect leads.
b. Replacement. Replace CKT BRK switch (65)
as rollows:
(1)
Removal.
(~) Tag leads and remove screws and lock-
washers which secure leads to CKT BRK switch.
~) Remove CKT BRK switch mounting
hardware and remove CKT BRK switch.
(2) Installation. Install CKT BRK switch (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:
CAUTION
Open DC CONTROL CIRCUIT
BREAKER ( 2 7 , f i g . 3 - 1 7 )
before testing or replacing
ENGINE PRIMER switch.
a.
Testi
Test ENGINE PRIMER switch ( 6 3 ,
f i g .
3 - 1 8 as follows:
(1) Gain access to the rear of the control
cubicle panel ( 9 6 ) .
(2) Remove screw and lockwa.sher which secure
a lead to the ENGINE PRIMER switch.
(3) Check that ENGINE PRIMER switch is
spring loaded to “OFF” position. With an ohmmeter,
test ENGINE PRIMER switch for open circuit with
ENGINE PRIMER switch in “OFF” position.
(4) Test ENGINE PRIMER switch for a closed
circpit with ENGINE PRIMER switch held in “ON’
posit ion.
(5) Reconnect lead using screw and lockwasher.
b.
Replacement.
Replace ENGINE PRIMER
swi~ch (63) as follows:
(1)
Removal.
(~) Tag both leads and remove two screws
and lockwashers which secure leads to the ENGINE
PRIMER switch.
(Q) Remove mounting hardware which sec -
ures ENGINE PRIMER switch (63) to panel (96) and
remove ENGINE PRIMER switch.
(2) Installation.
Install ENGINE PRIMER
switch (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:
CAUTION
Open DC CONTROL CIRCUIT
BREAKER ( 2 7 , f i g . 3 - 1 7 )
before testing or replacing
START-RUN-STOP switch.
a. Testing. Test the engine START- RUN-STOP
swi~ch ( 6 4 , f i g . 3 - 1 8 ) as follows:
(1) Gain access to the rear of the control
cubicle panel (96).
(2) Check spring return from START to RUN
position.
(3) Tag and remove leads from the engine
START -RUN-STOP switch and test the switch for
continuity as follows:
(~ Place engine START -RUN-STOP switch to
START position and with an ohmmeter test for con-
tinuity (closed contacts) between contacts 2 to 3;
contacts 5 to 6; coutacts 8 to 9: and contacts 11 to
12.
(b) Place engine START -RUN-STOP switch to
RUN position, test for continuity between contacts
2 to 3 and contacts 8 to 9.
(c) Check for open circuit between contacts
5 to 6. an~between contacts 11 to 12.
(~) Place engine START -RUN-STOP switch to
STOP position and test for open circuit between
all contacts.
(~) If engine START-RUN-STOP switch does
not operate correctly, replace it.
@ Reconnect leads as tagged and remove
tags .
~. Replacement.
Replace defective engine START-
RUN-STOP switch as follows:
(1)
Removal.
(q) Tag and remove leads from the engine
START -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
