jcb JS300 Service Manual page 848

Fig 8.
Replacement
1 Attach slings to the ram and lift it into position on the
dipper.
Fig 9.
E-187
2 Install the pin, bolt and nuts to the cylinder end of the
ram.
803092
Note: When checking or refitting JS machine pivot pins,
the retaining nuts and bolts should not be fastened up tight
to the pivot boss but must have approximately 3mm of play
so that the pin is free from tension.
3 Connect the hoses.
803096-1
9813/5100-1
Section E - Hydraulics
Hydraulic Rams
Removal and Replacement
Fig 10.
Fig 11.
803093
E-187