( 2 ) I n s t a l l a t i o n . I n s t a l l e n g i n e S T A R T - R U N-
STOP (64) switch using removal steps in reverse
o r d e r . R e m o v e t a g s .
3 - 1 2 0 . C o o l a n t T e m p e r a t u r e G a g e .
See (80, fig. 3-18) and proceed as follows:
a . T e s t i n g.
(1) Gain access to the rear of the control
cubicle panel (96).
CAUTION
D i s c o n n e c t n e g a t i v e b a t t e r y t e r m i n a l p r i or
t o m a k i n g c i r c u i t c h a n g e s . R e c o n n e c t t h is
t e r m i n a l p r i o r t o c h e c k i n g m e t e r s , g a g e s
and indicating lights.
(2) Tag and remove the lead from the SEND
contact of the COOLANT TEMPERATURE gage (80).
(3) The O to 500 ohm FREQUENCY ADJUST
rheostat on the control cubicle panel (96) can be used
t o c h e c k t h e C O O L A N T T E M P E R A T U R E g a g e . D i s-
connect and tag all leads from the FREQUENCY AD-
J U S T
r h e o s t a t.
(4) Connect a multimeter between the wiper
a r m t e r m i n a l a n d e i t h e r o t h e r t e r m i n a l o f t h e F R E-
QUENCY ADJUST rheostat and adjust the rheostat
u n t i l t h e m u l t i m e t e r r e a d s p r e c i s e l y 4 6 0 o h m s . D i s -
connect the multimeter but do not disturb the rheostat
s e t t i n g.
(5)
Check
that
START-RUN-STOP
switch
(fig.
2-5) is set to RUN, BATTLE SHORT switch (fig. 2-5)
to ON, and the DC CONTROL CIRCUIT BREAKER
(27, fig. 3-17) is in closed ON position. Connect the
460 ohm resistance of the FREQUENCY ADJUST
rheostat in series with ground and the SEND terminal
o f t h e c o o l a n t t e m p e r a t u r e g a g e . G a g e s h o u l d r e a d
a p p r o x i m a t e l y
2 4 0 ° F .
( 6 ) D i s c o n n e c t r h e o s t a t f r o m c i r c u i t a n d r e -
connect leads removed in paragraph (3) above/
(7) If the COOLANT TEMPERATURE gage
d o e s n o t o p e r a t e c o r r e c t l y , r e p l a c e i t .
b . R e p l a c e m e n t . R e p l a c e t h e C O O L A N T T E M-
PERATURE gage as follows:
( 1 ) R e m o v a l .
( a ) Gain access to the rear of the control
cubicle panel (96).
( b ) T a g a n d r e m o v e t h e l e a d s f r o m
C O O L A N T-T E M P E R A T U R E g a g e ( 8 0 ).
( c ) Remove the two nuts (81), two washers
(82), and clamp (83) which secure the COOLANT
T E M P E R A T U R E g a g e ( 8 0 ) a n d r e m o v e g a g e.
( 2 ) I n s t a l l a t i o n .
Install COOLANT TEMPERA-
TURE gage (80) using removal steps in reverse
o r d e r , R e m o v e t a g s .
3 - 1 2 1 . O i l P r e s s u r e G a g e.
See (78, fig. 3-18) and proceed as follows:
a . T e s t i n g
(1) Gain access to the rear of the control
cubicle panel (96).
CAUTION
C o n n e c t b a t t e r y n e g a t i v e t e r m i n a l p r i or
to checking the OIL PRESSURE gage (78)
r e a d i n g s.
R e m o v e t h i s t e r m i n a l p r i or
to making circuit changes.
(2) Tag and remove the lead from the SEND
terminal of the OIL PRESSURE gage.
(3) The 0-500 ohm FREQUENCY ADJUST
rheostat can be used to check the OIL PRESSURE
g a g e . D i s c o n n e c t a n d t a g a l l l e a d s f r o m t h e
F R E Q U E N C Y A D J U S T r h e o s t a t.
(4) Connect a multimeter between the wiper
arm terminal and either terminal of the FREQUENCY
ADJUST rheostaL and adjust FREQUENCY ADJUST-
M E N T r h e o s t a t u n t i l t h e m u l t i m e t e r r e a d s p r e c i s e l y
3 0 o h m s . D i s c o n n e c t t h e m u l t i m e t e r b u t d o n ot
d i s t u r b r h e o s t a t s e t t i n g.
(5) Set START-RUN-STOP switch to RUN,
BATTLE SHORT switch to ON, and DC CONTROL
CIRCUIT BREAKER to the closed ON position.
Connect the 30 ohm resistance of the FREQUENCY
ADJUST rheostat in series with ground to the SEND
t e r m i n a l o f t h e O I L P R E S S U R E g a g e . G a g e s h o u l d
r e a d a p p r o x i m a t e l y 1 2 0 p s i .
( 6 ) D i s c o n n e c t F R E Q U E N C Y A D J U S T r h e o s t at
f r o m c i r c u i t a n d r e c o n n e c t l e a d s r e m o v e d i n
paragraph (3) above.
(7) If the OIL PRESSURE gage does not operate
c o r r e c t l y , r e p l a c e i t.
b . R e p l a c e m e n t . R e p l a c e t h e O I L P R E S S U RE
gage (78) as follows
( 1 ) R e m o v a l.
( a ) Gain access to the rear of the control
cubicle panel (96).
(b) Tag and remove the leads from the OIL
P R E S S U R E g a g e /
(c) Remove the two nuts, two washers, and
clamp which secure the OIL PRESSURE gage and
r e m o v e g a g e .
3 - 44