Allis-Chalmers LA-1600, Instruction Book

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.•
I .
(
R
e
f
e
r t o
F
i
g
u r
e
2}
Tr i p
l a t
c
h
( 2 1 6)
s hou l d have an e n g a g
e
m
e
n
t of
. 0621 1 p l us
o r m i n u s
. 0 1 5 " o n
t r i p s ha f t ( 2 1 5} .
Meas u r emen t i s ma
de
w i t h t h e l a t c h
re� t i n g on
t
h
e
s � a f t
i n t he r
e
s
e
t
p
o
s
i
t
i
o
n .
2 . Ma i n
Con t a c t
Ma ke
( Re f�r
t
o
F i gure 6)
Compres s i on
of
con ta c t f i n ge rs (6 1 9)
s hou l d
b e b e
t w e
e
n
. 09 3 1 1
a r. d
. 12511•
Th i s
i s
t he
d
i
f f
e r e n ce i n t h e mea s u remen t f rom t h e
b
rea ke r
b a s e t o t he
c
e
n t
e
r
of the f i n g e
r
con t a c t s u r f a ce when t he b re a ke r
i s open a n d t h e meas u r eme n t i n t he s ame p l a 'e wh e n
t
h
e
b re a ke r
i s
, l
o
s
e
d
.
Th i s
i s
c h
e
c
k
ed w i t h
a no rma l
c
l
o
s
i n
g
o pe ra t i o� - no t
ma i n tena n ce c l os i n g . Adj u s tme n t
i s
p rov i ded
b y
po
s i
t i
on i
n
g
s cr ews
(b08)
a
f
t
e r
l oos e n i n g n u t s ( 62 1 ) .
C ou n t e r c l oc kw i s e r o t a t i on
o f
s
c
r e w s
{608)
i n
c
r
e
a
s
e s coo p r e s s i on . C a r e s hou l d b e t a ke n t o r e ­
t i g h ten n u t s
(62 1 )
a
f
t
e
r
adj us tmen t . I f
i
t i s d e s i red t o
che c k
con t a c t p r e s s u r e , a
pus h - t y pe
s
p
r i n
g
s ca l e c a n b e u s e d t o
c
anc r c s s
c on t a c t f i n g e r s
( 6 1 9) ,
w i t h b
r
e
a
k e
r
ope n .
C on
t a c t
pr e s s u r e
s ho� l d
be be tween
20
a n d
30
pound s .
·
3 .
Ma ke
(
Refe r t o
F
i
g
u
r
e
b)
W i t h mova b l e a r c i ng
con t a c t (620)
i
n
any one phase touch i ng the
ma t i n g s t a t i on a ry c
on t
a
c
t whe n t he b r e a ke r i s c l osed
by
the ma i n­
t
e
,a
n
c
e
c
l os i
n
g me t h od .
{see Ta b l e 3) ,
the
pha s e t o pha se
va r i a t i on
s hou l d n o t ex ceed
. 062 1 1 •
A d
j us
t
m e n t may
be
m a d e
by
pos i t i on i ng
s c r ews (608) a s I n
pa ra g ra ph
2 ,
b u t i t
i s
e s
s
e
n t
i
a l t h a t
t h e
ma i n
c on t a c t coo1pre s s i on
be ma i n t a i ned w i t h i n t h e t o l e ra n ce l i s t ed
i n
pa r a g ra ph
2 .
A r c i n g
con t a c t p re s s u r e s h o� l d be be twee n
30 a
n d
40
pounds
w
he n che c ke d
w i t h a pu l l - t y pe s p r i n g s ca l e at t he
base
cf
t he a r c i n g
c o
n t a c t t i p
i n
s e r
t
w i t h t he b r ea ke r c on t a c t s
c
l os e d .
4 .
E l e c t r i ca l
e
r
e
a
k
e
r
s
( Re f e r
t o
Fi g u r e s 2 A a
n
d 3)
a) �
o t
or Cut-O f f
S
w i t
c
h
and Sw i t c h -
The s e s �ot i t ch e s a r e moun
t e d
on
a
corrmon b r a c ke t
t
h
a
t I s s e t a n d
r o l
1 - � i nned
i n pos i t i on d u r i n g p r od � c t i on
t
e s
t
i
n g
.
J f
r
e p
l
ac
e
­
men t
i s r e q u
i r e
d
,
the
b r a c ke t m u s t
be
p o
s
i t
i
o
n
ed s o t h a t
when
r o l l p i ns
{236)
i n gea r ( 2 3 5 )
a re
a t t he top p
os i
t
i o n
,
t hev hdve
moved p l u nge r
( 2 3 3 )
a ga i n s t t he r o l l e r o f mo t o r c u t -o f f
s� f t ch
( 2 3 2 } to s h u � o f f
t h e
mo t o r . As
t he s p r i n g s a re
c
h
a
r g
e
d
.
a rm
( 2 3 1 )
m� s t e
n
g
a
g
e
the ro l l
e
r of s p r i n g - pos i t i on
�w i t ch
(2 30) .
P i l o t
�o l e s
a r e
p r ov i ded
: n the m
o
�
�
t
i
n
g
b ra c ke t f or
d r i
I
l i n g
a n d
ro l l - p i n r. i n g
t he r e p l aceme� t
a
s s
em
b
l y
i n
t he
cor r e c t
pcs i t i on .
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