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Hydra-Mac Hydrostatic Charge Oil Pressure Questions
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<blockquote data-quote="Condor" data-source="post: 17170" data-attributes="member: 1887"><p>Thanks Tazza, all of it makes sense. Guess I need to get temperature readings of the oil with an infrared thermometer and go from there. This machine doesn't have any oil temperature control except an oil cooler bypass that consists of a fixed orifice fitting of about 1/8". The probable purpose of this bypass is to prevent oil cooler from getting over-pressurized with cold oil. Perhaps I should configure a way to close the bypass for warm oil, to force more oil to flow thru the cooler. The pressure drop to zero when the hydra-static system is heavily loaded still worries me, I wondering if worn hydra-static components is causing the excessive extreme low pressure. Is there any test for worn components other than dismantling/inspection? Sounds like Bobcat shares the hydraulic system for the charge function. The only shared portion in the Hydra-Mac is the suction line from the tank to the charge and hydraulic pump. Even all the case drains on all the hydra-static components are piped independently back to the oil tank. I will try the drop boom trick anyway. Thanks for the kudos regarding the external relief valve addition. I spent considerable time selecting the external valve in the McMaster-Carr catalog. Thanks again for the reply, Joe</p></blockquote><p></p>
[QUOTE="Condor, post: 17170, member: 1887"] Thanks Tazza, all of it makes sense. Guess I need to get temperature readings of the oil with an infrared thermometer and go from there. This machine doesn't have any oil temperature control except an oil cooler bypass that consists of a fixed orifice fitting of about 1/8". The probable purpose of this bypass is to prevent oil cooler from getting over-pressurized with cold oil. Perhaps I should configure a way to close the bypass for warm oil, to force more oil to flow thru the cooler. The pressure drop to zero when the hydra-static system is heavily loaded still worries me, I wondering if worn hydra-static components is causing the excessive extreme low pressure. Is there any test for worn components other than dismantling/inspection? Sounds like Bobcat shares the hydraulic system for the charge function. The only shared portion in the Hydra-Mac is the suction line from the tank to the charge and hydraulic pump. Even all the case drains on all the hydra-static components are piped independently back to the oil tank. I will try the drop boom trick anyway. Thanks for the kudos regarding the external relief valve addition. I spent considerable time selecting the external valve in the McMaster-Carr catalog. Thanks again for the reply, Joe [/QUOTE]
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Hydra-Mac Hydrostatic Charge Oil Pressure Questions
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