Maeda MK0003, Руководство по обслуживанию, Страница: 135 / 348

2-107
Number Name Q
’
ty
Note
1 Jib No.1 cylinder assembly 1
2 Jib No.2 cylinder assembly 1
3 O-ring 2 1B-P12
4 Hexagon socket head cap screw 6 M12 × 1.75 × 90L
5 Hexagon socket head cap screw 2 M12 × 1.75 × 30L
6 Spring washer 8 M12 × Type 2 (plated)
7 Plain washer 2 M12 × Regular circle
80 Plug 2 3/8 Resin plug
81 Plug 1 1/8
Jib No.1 telescopic cylinder specifications
Cylinder bore x Rod bore - Stroke

55 ×

40 - 1130st
Speci
fic
ati
on
v
a
lue
Normal load
When extended 48.9 kN (at 20.6 MPa) [4.9t (at 210 kgf/cm
2
)]
When contracted 23.1 kN (at 20.6 MPa) [2.3t (at 210 kgf/cm
2
)]
Hydrostatic test pressure
Extension side 30.9 MPa (315 kgf/cm
2
)
Contraction side 30.9 MPa (315 kgf/cm
2
)
Jib No.2 telescopic cylinder specifications
Cylinder bore x Rod bore x Stroke

55 ×

40 - 1105st
Speci
fic
ati
on
v
a
lue
Normal load
When extended 48.9 kN (at 20.6 MPa) [4.9t (at 210 kgf/cm
2
)]
When contracted 23.1 kN (at 20.6 MPa) [2.3t (at 210 kgf/cm
2
)]
Hydrostatic test pressure
Extension side 30.9 MPa (315 kgf/cm
2
)
Contraction side 30.9 MPa (315 kgf/cm
2
)
Cylinder spontaneous contraction amount (internal leak amount)
Note: Keep the temperature constant because a cylinder contraction amount can be affected by thermal expansion due to
temperature change.
Components of cylinder
Max. internal leak
amount
cc/min
Cylinder bore area
cm
2
Cylinder contraction
amount
cm/day
Jib No.1 telescopic cylinder (from JIS B8367) 0.14 23.7 8.5
Jib No.2 telescopic cylinder (from JIS B8367) 0.14 23.7 8.5
Counter balance valve
Leak amount of No.1 portion
0.05
23.7 3.0
Leak amount of No.2 portion 23.7 3.0
Total 23.0