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Caterpillar Skidsteer Forum
05 Cat 257b Hydraulics leaking down .
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<blockquote data-quote="ianmcolo" data-source="post: 118149" data-attributes="member: 19570"><p>I think you have a couple of issues: 1-the cylinders leaking could be a: seals around the pistons in the cylinders or b: a relief valve in the control valve. C-Your control handles could be bypassing oil activating the lift and tilt spools. Both functions lift and tilt have their own circuit with a common high pressure relief. They also have their own port relief valves also. 2-with the machine slowly rolling down a hill could be an issue with drive motors or in the pump. The drive system is separate from the lift and tilt functions but use the same oil. 3-loosing hyd power after running for a while-as things heat up, they expand and oil gets thinner. Pull the hydraulic off and check for anything shiny like metal flakes, if you see metal then you have an issue in the pumps. If the oil is good then you will need to start diagnosing each thing one at a time.</p></blockquote><p></p>
[QUOTE="ianmcolo, post: 118149, member: 19570"] I think you have a couple of issues: 1-the cylinders leaking could be a: seals around the pistons in the cylinders or b: a relief valve in the control valve. C-Your control handles could be bypassing oil activating the lift and tilt spools. Both functions lift and tilt have their own circuit with a common high pressure relief. They also have their own port relief valves also. 2-with the machine slowly rolling down a hill could be an issue with drive motors or in the pump. The drive system is separate from the lift and tilt functions but use the same oil. 3-loosing hyd power after running for a while-as things heat up, they expand and oil gets thinner. Pull the hydraulic off and check for anything shiny like metal flakes, if you see metal then you have an issue in the pumps. If the oil is good then you will need to start diagnosing each thing one at a time. [/QUOTE]
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05 Cat 257b Hydraulics leaking down .
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