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Caterpillar Skidsteer Forum
Cat 239D Down Pressure Issue
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<blockquote data-quote="ianmcolo" data-source="post: 113612" data-attributes="member: 19570"><p>When you lift the boom arms all the way up, then hold it there, do the engine rpms drop? You might want to compare the rpms to the tilt function. If they RPMs do not drop that means hydraulic pressure is not building up inside the cylinder which means oil could be bypassing past the cylinder piston. Easy fix-reseal the cylinders. Another way to check this is also leave the boom half way up and see if it drops with in an hour or so. If it does again it might be oil bypassing cylinder piston. Does your machine seem to pick up heavy loads like it should? If the problem is not in the cylinder in might be in the boom section of the control valve. Hope this helps.</p></blockquote><p></p>
[QUOTE="ianmcolo, post: 113612, member: 19570"] When you lift the boom arms all the way up, then hold it there, do the engine rpms drop? You might want to compare the rpms to the tilt function. If they RPMs do not drop that means hydraulic pressure is not building up inside the cylinder which means oil could be bypassing past the cylinder piston. Easy fix-reseal the cylinders. Another way to check this is also leave the boom half way up and see if it drops with in an hour or so. If it does again it might be oil bypassing cylinder piston. Does your machine seem to pick up heavy loads like it should? If the problem is not in the cylinder in might be in the boom section of the control valve. Hope this helps. [/QUOTE]
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Cat 239D Down Pressure Issue
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