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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
charge pressure dropping under load
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<blockquote data-quote="skidsteer.ca" data-source="post: 7168" data-attributes="member: 307"><p>The hydrostats can move likely 300% the oil the hyd pump does, but most of it is pumped around and around and a percentage is let out the case drains to help cool the system.</p><p>If case drain flow is exceeding even 5 gpm I'd guess that to be alot. If the flow is under that then maybe the replentishing valve is sticking and the charge oil is not being replaced.</p><p>My 553 would bounce around wildly at various times if the boom was moved quickly or a cylinder was bottomed and the relief opened. But usually it was quite constant + or - 5 to 10 psi (95% of the time)</p><p>wheel spend had little efect on the pressure.</p><p>Ken</p></blockquote><p></p>
[QUOTE="skidsteer.ca, post: 7168, member: 307"] The hydrostats can move likely 300% the oil the hyd pump does, but most of it is pumped around and around and a percentage is let out the case drains to help cool the system. If case drain flow is exceeding even 5 gpm I'd guess that to be alot. If the flow is under that then maybe the replentishing valve is sticking and the charge oil is not being replaced. My 553 would bounce around wildly at various times if the boom was moved quickly or a cylinder was bottomed and the relief opened. But usually it was quite constant + or - 5 to 10 psi (95% of the time) wheel spend had little efect on the pressure. Ken [/QUOTE]
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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
charge pressure dropping under load
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