FisherFarms 1 Posted November 25, 2020 Share Posted November 25, 2020 New to us MX120 with L650 self leveling loader tilts down very slowly at high rpms and will not tilt down at all with low rpms. Everyone we have talked to has mentioned blow by in cylinder. We swapped lift and tilt hoses at the quick connector and it tilts down fine. Quote Link to post Share on other sites
maxxum 140 124 Posted November 25, 2020 Share Posted November 25, 2020 I am guessing its in the hydraulic self leveling valve. My mechanic said they were prone to problems. 1 Quote Link to post Share on other sites
J-Mech 1,489 Posted November 25, 2020 Share Posted November 25, 2020 Does your set up have it's own loader valve with joystick? Or are you running it off of the tractor remotes? Quote Link to post Share on other sites
snoshoe 535 Posted November 25, 2020 Share Posted November 25, 2020 This is too new for me to know But. You swapped between lift and tilt. Did problem move also, or did it disappear. If problem moved to lift. It is either valve or coupler. If it disappeared problem is with coupler. 1 Quote Link to post Share on other sites
Matt Kirsch 1,006 Posted November 25, 2020 Share Posted November 25, 2020 It does sound like they swapped lift and tilt, and tilt works fine. That means "blow by in the cylinder" is not the cause of the issue. Also eliminates the hoses and couplers on the hoses. To me it indicates that the problem is either one of the couplers on the tractor, or internal to the valve. Did you try swapping back? Did the problem return? Quote Link to post Share on other sites
Gearclash 1,056 Posted November 25, 2020 Share Posted November 25, 2020 First thing we need to know is if this loader is hydraulic self leveling, or mechanical. I guess what I should ask is if it is this style of CIH loader, the older Great Bend based design that was sold with that tractor? Quote Link to post Share on other sites
snoshoe 535 Posted November 25, 2020 Share Posted November 25, 2020 Ah yes I forgot that. Quote Link to post Share on other sites
maxxum 140 124 Posted November 25, 2020 Share Posted November 25, 2020 If it is a 650 it has to be a hydraulic self leveling loader in that series they never made a mechanical self leveling loader 1 Quote Link to post Share on other sites
CIHTECH 533 Posted November 25, 2020 Share Posted November 25, 2020 Don't forget to check cable adjustment, almost sounds like your not stroking the spool far enough. I have seen then lose adjustment due to wear or coming loose. This would pertain more to the remote mounted loader valve that is on front of right rear axle group. 1 Quote Link to post Share on other sites
snoshoe 535 Posted November 25, 2020 Share Posted November 25, 2020 Hydraulic self leveling valves I'm familiar with are actualy flow divders that divide off part of return from top of lift cylinders and add it to base of tilt cylinder. I fail to see how that can restrict tilt speed. So my first answer still stands until someone can show me my error. Want to know is lift slow to drop now? 1 Quote Link to post Share on other sites
Gearclash 1,056 Posted November 26, 2020 Share Posted November 26, 2020 2 hours ago, snoshoe said: Hydraulic self leveling valves I'm familiar with are actualy flow divders that divide off part of return from top of lift cylinders and add it to base of tilt cylinder. I fail to see how that can restrict tilt speed. So my first answer still stands until someone can show me my error. Want to know is lift slow to drop now? I haven’t been into the self leveling valve on my loader, but I know it can do some odd stuff. It apparently can relief the tilt circuit for one. Also pretty sure the tilt compensation is adjustable. Quote Link to post Share on other sites
lightninboy 631 Posted November 26, 2020 Share Posted November 26, 2020 L650 is Alo Quicke built? There were Alo Quickes with hydraulic self-leveling? 1 Quote Link to post Share on other sites
Gearclash 1,056 Posted November 26, 2020 Share Posted November 26, 2020 Erroneous content removed. Quote Link to post Share on other sites
lightninboy 631 Posted November 26, 2020 Share Posted November 26, 2020 1 Quote Link to post Share on other sites
Gearclash 1,056 Posted November 26, 2020 Share Posted November 26, 2020 Well I learned something. Those were made by Matcor. Nothing to do with Great Bend evidently. One thing worth mentioning about CIH labeled loaders. It is necessary to be specific about what the exact loader in question is because CIH reused model numbers a few times. I know in the parts look up there are two quite different L750s. Quote Link to post Share on other sites
FisherFarms 1 Posted November 26, 2020 Author Share Posted November 26, 2020 Thanks for all the quick replies. It is a hydraulic level loader. Looks like the leveling valve bolts on top of the valve stack. It has its own hydraulic return line with a flow restrictor. I did take cable loose and manually manipulate the valve with no change. Quote Link to post Share on other sites
FisherFarms 1 Posted November 26, 2020 Author Share Posted November 26, 2020 I went ahead and took the to tilt cylinders off to have them repacked. One had a small external leak and moved slower than the other. Just wanted to eliminate the cylinders as a problem. I too think it’s the self leveling valve but have no experience with them 1 Quote Link to post Share on other sites
J-Mech 1,489 Posted November 26, 2020 Share Posted November 26, 2020 You didn't answer if the loader is running off of a dedicated loader valve stack or off the tractor remotes.... Quote Link to post Share on other sites
FisherFarms 1 Posted November 26, 2020 Author Share Posted November 26, 2020 Dedicated loader valve stack Quote Link to post Share on other sites
J-Mech 1,489 Posted November 26, 2020 Share Posted November 26, 2020 6 minutes ago, FisherFarms said: Dedicated loader valve stack And when you swapped hoses did the slow speed move to the boom? Quote Link to post Share on other sites
Gearclash 1,056 Posted November 26, 2020 Share Posted November 26, 2020 16 hours ago, FisherFarms said: tilts down very slowly at high rpms and will not tilt down at all with low rpms I find this a bit puzzling. Those loaders are not particularly sensitive to increased engine speed above say 1300 rpm or so. At that point the loader is getting the max flow and pressure it’s gonna get. Just the nature of the system. I am wondering if it is possible the compensator signal is getting lost from the spool normal used for the tilt circuit. To test this possibility, lock one of the rear remote valves in the “on” position (known as deadheading), not in float, and see if the tilt then works normally. Quote Link to post Share on other sites
FisherFarms 1 Posted November 26, 2020 Author Share Posted November 26, 2020 The tilt didn’t move down at all with 1300 rpms. Would creep down at 2000. Unfortunately we won’t have the cylinders back until next week Quote Link to post Share on other sites
Gearclash 1,056 Posted November 26, 2020 Share Posted November 26, 2020 If the tilt cylinders are apart, make sure whoever is working on them takes a look for wear in the cylinder head bores, where the rod slides through. I have seen them wear to the point that the rod seal in the head blew out. Quote Link to post Share on other sites
FisherFarms 1 Posted November 26, 2020 Author Share Posted November 26, 2020 Okay thanks I will Quote Link to post Share on other sites
Gearclash 1,056 Posted November 26, 2020 Share Posted November 26, 2020 On 11/25/2020 at 7:11 AM, FisherFarms said: New to us MX120 with L650 self leveling loader tilts down very slowly at high rpms and will not tilt down at all with low rpms. Everyone we have talked to has mentioned blow by in cylinder. We swapped lift and tilt hoses at the quick connector and it tilts down fine. What about the other way? Slow too? Or normal? Quote Link to post Share on other sites
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