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(Swing)
(1)Retracted L = 610
(Truck)
(1)Retracted L = 478 ± 1.5 (2)Extended L = 728 ± 2.5 (3)Stroke = 250
[Cylinder essential quality]
1. Seal durability:
Must conform to class "A" (0.05 ml / 100m) of "JIS B 8354"
under following conditions.
Oil pressure : 21.6 MPa (220 kgf / cm
Oil temperature : 100 deg, Speed : 16.6 m / min,
Sliding distance : 300km
2. Dust Seal properties :
Dust enter must be 11 mg or less under following condi-
tions.
Speed : 16.6 m / min, Stroke : 150 mm,
Number of repetitions : cycles,
Vibration applied to facility : 7.4 Hz
3. Internal oil leakage :
3
Must be within 1 cm
for 3 min under the condition of the
main relife pressure 21.6 MPa (220 kgf / cm
the stroke end (Oil temperature 50 ± 5 deg).
4. Minimum operating pressure :
Must be within 4 % of the main relief pressure 0.86 MPa
2
(8.8 kgf / cm
) applied to the bottom port after 3 or more
cycles with full stroke sliding under none load (Oil tempera-
ture 50 ± 5 deg).
5. Withstanding pressure :
Permanent deformation and oil leakage must not occur
after pressure 2 times as high as the main relief pressure
2
43.1 MPa (440 kgf / cm
) is applied by 40000 time or more.
(1)
(2)
(3)
+3
(2)Extended L = 940
0
(1)
(2)
(3)
T.T. : Tightening torque
6. Withstanding external force :
Any damages, distortions, oil leakage, permanent defor-
mations must not occur in any parts when external force 2
times as high as the main relief pressure 43.1 MPa (440
2
kgf / cm
),
30000 times or more.
7. Rust prevention of plating :
Must be rating number 9 or higher after 4 cycles (64 hour)
of CASS testing. Thickness of platinf must be kept more
than Ep-ICr30 (0.03 mm)
8. Cushion performance : (Cushion type cylinder only)
Cushion facility must be set in bottom side for contraction
with following performance.
Oil temperature : 30 deg / cushion time : 2 seconds or less
2
Oil temperature : 50 deg / cushion time : 1 ± 0.3 seconds
) applied to
Oil temperature : 80 deg / cushion time : 0.3 seconds or more
9. Piston rod surface treatment :
Piston rod rubbing part : Ni-Hcr or Hcr plating
Thickness 9.03 mm or more
Hardness HV (25g) 700 or more
Induction hardening : HRC 50 to 56, Depth 2 to 3 mm
II-91
(3)Stroke = 330
0
- 5
T.T.
2
) the cylinder thrust force (12240 kgf) is applied by
WSM U15-3
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