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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
753 pump *hums*
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<blockquote data-quote="Tazza" data-source="post: 18373" data-attributes="member: 82"><p>Ok, small update.</p><p>The cause of the hum has been found BUT i don't know what is causing it, does that make any sense?</p><p>The charge pressure is far too high, i threw a gauge on it and it was off the scale that reads up to 260, it would have been at least 300 PSI as it was off the scale. It should be set to 200. There is a charge pressure relief on the back of the pump which i removed to ensure it wasn't stuck and it was perfect. I installed one off another pump i have, no change. I then removed the spring and poppet that should have brought the pressure rite down to near zero, but no it was still over 260 PSI.</p><p>The charge pressure is measured after the oil cooler and filter head so as far as i'm aware it can't be a restriction in either of those. All i can think is its something inside the pump where the oil goes to the main hydraulic pump through the other piston pump sections.</p><p>As i don't have any parts breaks downs for this machine i can't check if there are any anti-cav valves in that section that could have gotten stuck and causing problems. I'd assume the insides of the hydraulic hoses wouldn't just close up without any heat to damage the hose.</p><p>It still works and works well but i still want it to be rite and to not be so noisy! i don't know if higher charge pressure will cause damage down the track either.</p><p>Any ideas guys?</p></blockquote><p></p>
[QUOTE="Tazza, post: 18373, member: 82"] Ok, small update. The cause of the hum has been found BUT i don't know what is causing it, does that make any sense? The charge pressure is far too high, i threw a gauge on it and it was off the scale that reads up to 260, it would have been at least 300 PSI as it was off the scale. It should be set to 200. There is a charge pressure relief on the back of the pump which i removed to ensure it wasn't stuck and it was perfect. I installed one off another pump i have, no change. I then removed the spring and poppet that should have brought the pressure rite down to near zero, but no it was still over 260 PSI. The charge pressure is measured after the oil cooler and filter head so as far as i'm aware it can't be a restriction in either of those. All i can think is its something inside the pump where the oil goes to the main hydraulic pump through the other piston pump sections. As i don't have any parts breaks downs for this machine i can't check if there are any anti-cav valves in that section that could have gotten stuck and causing problems. I'd assume the insides of the hydraulic hoses wouldn't just close up without any heat to damage the hose. It still works and works well but i still want it to be rite and to not be so noisy! i don't know if higher charge pressure will cause damage down the track either. Any ideas guys? [/QUOTE]
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General Bobcat Skidsteer Forum
753 pump *hums*
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