Tadano TR-800XXL4, Service Manual

Page: 140 / 402

G - 1 G - 1
Telescoping System
8 WG02-0321E
3.2 Retraction
1. Top boom section
Retracted by the wire rope mechanism that
synchronizes with the retraction of 3rd boom
section.
Top
boom
IWG02-0420E03
W
2
T
W
2
T
Top boom
R
5
3rd boom
W
2
T
W
2
T
W
2
T
W
2
T
R
3
=L
2
3rd boom
W
2
T
W
2
T
2nd boom
4th
boom
F
3
2nd
boom
R
5
: Top boom section travel
R
3
: 3rd boom section travel
(=L
2
: No.2 cylinder stroke)
F
3
: 3rd boom section force
(=No.2 cylinder force)
W
T
: Top boom section weight
Balance of force :
T
T
3
W 3 =
2
W
× 6 = F
Equation of workload : W
T
× R
5
= F
3
× R
3
T
3
T
T
3
3 5
W
R
× W 3 =
W
R
× F = R
∴
= 3R
3
= 3L
2
- - - (b)
Top boom section travel (R
5
) = 3L
2
2. 4th boom section
Retracted by the wire rope machanism that
synchronizes with the retraction of top boom
section.
W
4
R
4
2nd boom
3rd boom
4th boom
Top
boom
4th boom
Top boom
2nd boom
IWG02-0420E04
F
5
2
F
5
2
F
5
2
F
5
R
5
R
4
: 4th boom section travel
R
5
: Top boom section travel
F
5
: Top boom section force
W
4
: 4th boom section weight