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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
Removing air from system
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<blockquote data-quote="skidsteer.ca" data-source="post: 2855" data-attributes="member: 307"><p>Tazz I would think all of the air would work itself out pretty quickly. I've never emptied the cooler and all the lines, just the reservoir and cylinder, filters. Still if the oil circulates under pressure the air must come out. as far as the cylinders after 1 or 2 cycles they "felt" normal, no pump skips. almost sounds like your losing charge pressure., or have some sort of restriction in the supply side of the system. If you are going to test run the unit more I think I'd put it up on jack stands to keep the press in the hydros as low as possible while you sort it out. Then you can drive it arond without working it. See if the foam and the skipping pump goes away.The higher the pressure when you have air trouble the harder it is on motors and pumps. If the wheels can turn free the press will stay low. However I can't see the air being trapped in the system for long. The first loop the oil makes should clean out 98% of it. I'd get a 100 psi guage and tap into the charge pump circuit and watch the pressure. Not sure on a 743, my 553 has around 60 psi, and this will dip to 25 or 30 momentarily if you bottom out a cylinder( pump "over relief"), and jump to 90 or so when you lower the boom quickly. But outside of these two exceptions stays steady @ 60 psi. Maybe the replenishing valve is sticking open and your press is low??? I've never had to fight to much with the hyd system, so I'm not much help, but this is the only other cause, that comes to mind that you have'nt mentioned. Ken</p></blockquote><p></p>
[QUOTE="skidsteer.ca, post: 2855, member: 307"] Tazz I would think all of the air would work itself out pretty quickly. I've never emptied the cooler and all the lines, just the reservoir and cylinder, filters. Still if the oil circulates under pressure the air must come out. as far as the cylinders after 1 or 2 cycles they "felt" normal, no pump skips. almost sounds like your losing charge pressure., or have some sort of restriction in the supply side of the system. If you are going to test run the unit more I think I'd put it up on jack stands to keep the press in the hydros as low as possible while you sort it out. Then you can drive it arond without working it. See if the foam and the skipping pump goes away.The higher the pressure when you have air trouble the harder it is on motors and pumps. If the wheels can turn free the press will stay low. However I can't see the air being trapped in the system for long. The first loop the oil makes should clean out 98% of it. I'd get a 100 psi guage and tap into the charge pump circuit and watch the pressure. Not sure on a 743, my 553 has around 60 psi, and this will dip to 25 or 30 momentarily if you bottom out a cylinder( pump "over relief"), and jump to 90 or so when you lower the boom quickly. But outside of these two exceptions stays steady @ 60 psi. Maybe the replenishing valve is sticking open and your press is low??? I've never had to fight to much with the hyd system, so I'm not much help, but this is the only other cause, that comes to mind that you have'nt mentioned. Ken [/QUOTE]
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General Bobcat Skidsteer Forum
Removing air from system
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