jcb JS300 Service Manual page 849

Fig 12.
Fig 13.
4 Hoist the ram to align with the link.
Install the pin, bolt and nuts.
Note: Stroke the ram to release entrapped air. After
releasing the air, check for oil leakage.
E-188
803094
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.
803142
9813/5100-1
Section E - Hydraulics
Hydraulic Rams
Removal and Replacement
Fig 14.
A409820-C2
E-188