jcb JS300 Service Manual page 907

Item Symptoms Related Parts
Oil leakage
from pipe and
cylinder tube
Cylinder tube
welded seam
3 pipe (hollow
piston rod)
Poor Piston rod
operation cylinder tube
Cylinder tube
4
4-1 Piston rod
Movement cylinder rod
not smooth sliding part
E-246
Trouble
Crack in welding
Bending is more than the
specified limit. (Bending
distortion: Refer to maintenance
standards)
There is a recess
Abnormal wear, damage of
sliding parts.
Foreign matter intruding on
piston and cylinder head sliding
area
9813/5100-1
Section E - Hydraulics
Hydraulic System Fault Finding
Treatment
Replace with new parts.
Cracks will develop into fractures.
Fractures are very dangerous, so if any
cracks are found, stop work immediately
and replace with new parts.
Welding on top of cracks will have no
effect.
Replace with new part. The seal and sliding
part material may be damaged too, so inspect.
If abnormal, replace.
Replace with new part. As above, inspect the
seal and sliding part material.
Replace with new part
As above, inspect the seal and sliding
part material.
Remove foreign material.
As above, inspect the seal and sliding
part material.
Hydraulic Rams
E-246