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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
753 boom won't come down, tilt won't curl back.
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<blockquote data-quote="scottyk" data-source="post: 8842" data-attributes="member: 1126"><p>Hi again everyone; thanks for all the suggestions on this problem. I just got a hold of an OTC flow/pressure tester. I was able to test the main relief valve and heres what i got. 1. Main relief valve opens at 2300 PSI 2. Flow is 11.5 GPM with tester valve fully opened and 10 GPM with restriction up to 2300. At 2300 PSI, I believe relief valve is opening and GPM drops all the way down to 0-2 GPM. (is it supposed to drop?) 3. I need to adjust relief valve tomorrow; book says it should open at 2550-2600. 4. Pump output is a little low. manual says it should have 13 GPM instead of 11.5. I will test the pump tomorrow after adjusting main relief. One thing I noticed is that when I start the machine the front auxilaries are already flowing at 5 GPM at idle and 11.5 GPM full throttle. (and this is with front auxilaries button disengaged.) I tested the front auxilary solenoid valves and they both were in the closed position and only opened when voltage was applied. I even disconnected the wiring harnesses to make sure they weren't being energizd by a faulty switch. I still had same result. Does anyone know if the front auxilaries are supposed to be fully pressurized on start up and auxilary switch off. If auxilaries are not supposed to be flowing at start up, I don't have any idea how they are being opened. Any help would be greatly appreciated. Thanks for your time. Scott.</p></blockquote><p></p>
[QUOTE="scottyk, post: 8842, member: 1126"] Hi again everyone; thanks for all the suggestions on this problem. I just got a hold of an OTC flow/pressure tester. I was able to test the main relief valve and heres what i got. 1. Main relief valve opens at 2300 PSI 2. Flow is 11.5 GPM with tester valve fully opened and 10 GPM with restriction up to 2300. At 2300 PSI, I believe relief valve is opening and GPM drops all the way down to 0-2 GPM. (is it supposed to drop?) 3. I need to adjust relief valve tomorrow; book says it should open at 2550-2600. 4. Pump output is a little low. manual says it should have 13 GPM instead of 11.5. I will test the pump tomorrow after adjusting main relief. One thing I noticed is that when I start the machine the front auxilaries are already flowing at 5 GPM at idle and 11.5 GPM full throttle. (and this is with front auxilaries button disengaged.) I tested the front auxilary solenoid valves and they both were in the closed position and only opened when voltage was applied. I even disconnected the wiring harnesses to make sure they weren't being energizd by a faulty switch. I still had same result. Does anyone know if the front auxilaries are supposed to be fully pressurized on start up and auxilary switch off. If auxilaries are not supposed to be flowing at start up, I don't have any idea how they are being opened. Any help would be greatly appreciated. Thanks for your time. Scott. [/QUOTE]
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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
753 boom won't come down, tilt won't curl back.
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