10
11
Num
The length of the arm
(
L=meter
)
Line diameter
/
diameter of
the spring
(
D=mm
)
Link hole selection
1
2
.
5<L<3
.
5
D=4
.
5
Link hole 1
2
3
.
5
≦
L
≦
4
.
0
D=5
.
5
Link hole 2
3
4
.
0<L<5
.
5
D=6
.
5
Link hole 2
4
5
.
5
≦
L
≦
6
.
0
D=6
.
5
Link hole 1
5
6
.
0
≤
L
For special order
Spring selection
,
installation
,
and adjustment
(
A
)
Spring selection
A. Selection
:
Balance spring
The parameter for selecting the balance spring
(B)
Spring installation
(
B
-
a
)
Selcect a suitable spring together with the screw mandrel
and insert them into the spring sleeve
.
(
B
-
b
)
Put the whole assembled sleeve into the spring bracket
.
(
B
-
c
)
Make the screw mandrel connected to the balance crank
by link hole 1 or link hole 2
.
(
B
-
d
)
Install the gasket and the screw at the bottom of the
screw thread pole
.
(
B
-
e
)
Spin the screw clockwise to adjust the press of the balance
spring
,
so that it can balance the weight of the arm
.
(C)
Spring replacement
(
C
-
a
)
Rise up the boom to the vertical position
.
If the power is
off
,
unlock the clutch device
,
put the boom to the vertical
position manually
,
and make sure the boom would not fall
down
.
(
C
-
b
)
Spin the bottom adjusting nut anticlockwise to disassemble
it and the baff
l
e ring
.
(
C
-
c
)
Fall down the boom to the horizontal posit
i
on manually
,
loosen
from the
the
spring
fixed
sleeve
screw
.
and take out the screw mandrel
(
C
-
d
)
Loosen 4 setscrews to take off the spring sleeve for
changing the new spring
.(
Refer to Fig
.
10
)
4 setscrews for
spring bracket
Inbuilt spring
:
Inbuilt spring
:
line diameter is 3
.
0 mm
;
Length is 145 mm
;
External diameter is 26 mm
.
The length of the boom from 5
.
5 to 6 meters has additional
instruction for inbuilt spring
.
In order to make a safe and steady performance and to decrease
the metal fatigue of the balance spring
,
3 inbuilt springs covered
with PVC pipe are inserted into the 6
.
5mm compressed balance
spring and separated with rubber cushion
.
Mandrel
Spring bracket
Fig
.
10
Adjusted nut
