78 - 3
Section E Hydraulics
9803/6410
Section E
78 - 3
Issue 1
Hydraulic Rams
Fault Finding (cont’d)
Item Symptoms Related Parts Trouble Treatment
Foreign matter on inner • Remove foreign matter.
and outer diameters. • Renew '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, renew.
Confirm the above and renew 'O'-ring.
Back up ring Deformation, protrusion • Renew, with the 'O'-ring.
Oil leakage Looseness • Dismantle 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, renew.
• After inspection, tighten to specified
torque.
Bolt Looseness, stretching, broken Renew 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.
To Next Page
Loading...
Need help?
General
