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Machinery Forum Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: JD 3155 [ Expand ] [ View Follow Ups ] [ Post Followup ] [ Return to Forum ] Posted by rod on July 02, 2003 at 21:19:32 from (142.177.113.140): In Reply to: Re: Re: Re: Re: Re: Re: Re: Re: Re: JD 3155 posted by davidval on July 02, 2003 at 13:02:27: I am not familiar with deere hydraulics, but seems that what David said could well be correct. Something has to give. If the pump is making flow, then the system is losing the oil before the front pump. Also, when they say "within specs", how carefully do they check? Some specs can give a variance of 2-3 gpm, or say 10%. There could also be a spec variance of 10% for low pressure bleed off in the system. With a charge pressure on the low side of spec, and bleed down on the high side (added together say 20-25%), and considering that most charge pumps only supply about 20% more than the high pressure pump can move, this might cause the momentary cavitation. This would be especially true with worm oil. The moral here... check the flow very carefully, especially if this is a high hour machine, where normal wear would be expected. Small inaccuracies can make a big difference. Just my thoughts. Rod Follow Ups: Post A Followup Name: E-Mail: Subject: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: JD 3155 Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.