jcb JS300 Service Manual page 859

Fig 43.
4 Hoist the ram to align the piston rod eye end with the
dipper pin position.
5 Install the pin, bolt and nuts.
Note: Stroke the ram to release entrapped air. After
releasing the air, check for oil leakage.
!M
WARNING
Metal Splinters
You can be injured by flying metal splinters when
driving metal pins in or out. Use a soft faced hammer
or copper pin to remove and fit metal pins. Always
wear safety glasses.
INT-3-1-3_2
Fig 44.
E-198
803171
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.
803152
9813/5100-1
Section E - Hydraulics
Hydraulic Rams
Removal and Replacement
Fig 45.
A409820-C2
E-198