78 - 3
Section E
Hydraulics
9803/6400
Section E
78 - 3
Issue 1
Hydraulic Rams
Trouble Shooting (continued)
Item Symptoms Related Parts Trouble Treatment
Foreign matter biting on inner • Remove foreign matter.
and outer diameter. • Replace 'O'-ring if damaged.
• Inspect inside tube: if any scratches or
O-ring damaged. rust, make surface smooth with oil stone.
O-ring • Inspect cylinder head 'O'-ring groove: if
any scratches or rust, make surface
smooth with oil stone.
• Inspect back up ring: if any deformation
or protrusion, replace.
Confirm the above and replace 'O'-ring.
Back up ring Deformation, protrusion • Replace with 'O'-ring.
Oil leakage Looseness • Disassemble cylinder head and inspect
2 from cylinder 'O'-ring and back up ring.
head joint Cylinder head • Check tube and cylinder head thread for
damage. If any damage, replace.
• After inspection, tighten to specified
torque.
Bolt Looseness, stretching, broken Replace all bolts and tighten to specified
torque.
Abnormal bulge Replace with new parts.
Oil leakage from connecting parts
Cylinder tube may be caused by abnormal
pressure (including cushion
pressure). Inspect the tube for
bulges, deformation and check the
circuit pressure.
Crack in welding Replace with new parts.
Oil leakage • Cracks will develop into fractures.
from pipe Cylinder tube Fractures are very dangerous, so if any
3 and cylinder pipe (hollow cracks are found, stop work immediately
tube welded piston rod) and replace with new parts.
seam • Welding on top of cracks will have no
effect.
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