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Re: EL300B Excavator hydraulics chatter and vibration

sounds like air in system or pump going bad.check out posts on the 330's hydraulic propblems
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Re: EL300B Excavator hydraulics chatter and vibration

Have been informed that last Mechanic suspected internal crack in RH control valve due to water contamination, trying to contact him now, also waiting on filters.

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EL300B Excavator hydraulics chatter and vibration

Hyd was contaiminated with water in the fall, trouble is chatter an vibration when using stick,swing,and RH travel, very loud chatter and violent vibration when using boom up fast, also reverberaters when you stop boom up, smooth and quiet for bucket, LH travel, and slow boom up.

in common with trouble is RH control valve bank and lower pump, suspect lower pump regulator. not sure.

anyone have this trouble before or suggestion.

Pilot pressure ok at 500 PSI, Nagative Control Pressure for upper pump at 500 PSI, lower pump 3-400 PSI bouncing.