Allis-Chalmers LA-1600, Instruction Book

Page: 52 / 100

:
..... ·
2 .
MA I NTE NAN C E AND TEST I NG
M� i n t enance
Each
s t
a
t
i
c
ove r cu r r en t t r i p dev i ce I s
a
d
j
u
s
t e d
,
c a l i b r a t ed , and t e � t ed
b e fore
s h i pmen t and i s
r
e
a
d
y
f o r
u s e af t e r
s e l e c
t
i
n
g a p p rop r i a t e s e t t i n gs
and
l
o
c
k
i
n
g
the poten t i ome t e r s h a f t s .
Ma i n tenance i n
t h e us u a l s en s e of c l ean , r e
a d
j
u
s
t
,
l ub r i ca te , e t c . i s not
r
eq
u
i
r
e d on s ta t i c ove r c u r ren t t r i p
d
ev i c e s .
The on l y ma i n t en a nce t h a t
i s recommended i s pe r i od i c ve r i f i ca t i on t ha t t h e dev i ce i s f u n c t i on i ng .
T
h
i
s
may be
s u
p
p l
em
e
n
t
e
d as
d
e
s i r e d b y c he c k i
n
g t h e ca l i b ra t i o.-. .
i n s pec t i on f o r l oose o r b
r
o k
e n
ex t e rna l w i r i ng , res t or i ng l os t
ca l i ­
b r
a
t i o
n
,
e t c .
I Los t
Ca
I i b ra t i
T h e
ca l i b ra t i on of
t h e s t a t i c ov e r c u r r
e
n
t
t
r
i
p
d
e
v
i
c
e
d e
p e
n d s o n t h e
knob s be i n g
p ro pe r l y
o
r
i
e n t e
d o n
t
h
e
i
r s ha f t s . I f t h e knobs a re f
o
r
c
ed
by
neg l ec t i ng t o l oosen the
s
h
a
f t l oc k s ,
ca l i b r a t i on w i
I I
be
l os t ,
but
ca
n r ea d i l y b e r e s tored .
A
k
n o b
w i
I I b
e
i n
p rope r ca l i b ra t i on I f ,
w
h e
n
t u r ned coun t e rc l oc kw i s e
a s
fa r a s
i t can go ,
the po i n t e r l i nes up p r
e
c i
s
e
l y w i t h t h e red ca l i b ra t i on
d o t
o n the d i a l . Re f e r
t o F
i
g
u
r
e
7 6 .
I f t h e a bove
c
h e c
k
s h ows
t h e
c a l i b ra t i on
t o b e
i n
e r r o r ,
r emov e t h e
knob
by l oos en i n g i t s s e t s c rew and
s l
i p
p
i
n
g
i t
o f
f
t he
s
h
a
f t
.
Then
�e
s u re
the s ha f t
l ock
I s l oo
s
e
n
e
d
( s ee F i g u re 7B)
a n d t u r n t h e
s h a f r ct)un t e r ­
c l oc kw i s e a s f a r a s I t w i
I I
g o .
Kee p t he
s
h
a f t
I n
t b a t pos i t i on
a�d
r e p
l
a
c
e t h e
knob s o
t h a t i t i s d i rect l y
ove r
t
h
e
red ca l i b ra t i on
d o t .
T i g h t e n the s e
t
s c rew i n the k
n o
b
.
W i t h the s h a f t
l
o c k l oos ened , t h e knob ma y
now
b e t u r ned t o t h e s e l ec t e d
d i a l pos i t i on ,
t h e s h a f t l oc ked , and t h e dev i ce . r e t u r n e d t o
s e rv i c e .
T h e
t es t i ng of A l l i s - Cha l me r s s t a
t
i c ove rc u r r e n t t r i p d e
v
i c
e
s
I s
eas l
l y
acc��p l i s hed unde r
f i e l d
cond i t i ons
w
i t
h a
m
i
n i
m
um of
e
qu i
p m e
n
t
a n d
p
r e
pa r a t
i
o
n
. V a r i ou s t e s t s c a n be made ,
a n d i n a
ma n ne r t h a t m � k c s
them
s u i
t
a
b
l e f o r u s e d u r i ng r o u t i ne
m a i
n t e
n
a
n
ce
.
Ca l i b r a t i on c a n n o t norma l l y
b e done und e r f i e l d cond i t i ons .
T h e t e s
t
s t h a t w i I I be de s c r i bed can be done on
a
c
om
p
l
e
t
e b r e a k e r
a s
s
emb
l
y l oca t e d
i n t h e d i s connec t p o s i t i o
n i n
t
h
e
c
u b
i
c l e
,
on
t he
comp l e te b
r
e
a
k
e r
on a wo r k
t a b l e ,
or
on
a s ta t i c t r i p
dev i ce c cxnp l e t e l y
removed f rom
the b
r e
ake
r
. I t
i s
n o t
nece s s ary
to remove p
e
rma n e n t
w i r i n g i n o r d e r t o make
t es t s . Tes t i ng can b e done o n
a b re a ke r exact l y
a s i t i s
u s
e
d
i n no rma l s e rv i ce .
T e s
t
S i m p l e , r e
a
d
i
l
y a va i l a b l e
e
q
u
i pme
n
t i s u s ed I
n
the t es t i n g of s t a t i c
o v e r c u
r
r
e n t
t r i p dev i ce s . The fo l l ow i ng i t ems of
equ i pmen t
a re
requ i red
for
p
e
r
f
o
r
m
i n g t h e
r ou t i ne
FUNCT I ON Tes t .
- 1 7 -