bt81camaro 0 #1 Posted April 7, 2014 The Ark Loader on my D is having hydraulic issues. I do not know where to start. When I try to use the loader the hydraulic pump will stall. It slips the belt on the PTO. If I tighten the belt, it will slip the PTO itself. I just replaced the pump last year. I am wondering if I need to look at the valve assembly or the hoses first. Can you guys give me any hints? I do not know much about hydraulics. Thank you! Share this post Link to post Share on other sites
brandonozz 168 #2 Posted April 7, 2014 So you have used the loader before and it worked fine? Has it worked normally since replacing the pump? You may want to install a pressure gauge on the pressure side to the spool valve to see how high the pressure is going when you operate the valves. Does the belt slip when either valve is operated? There are some good hydraulic guys that I'm sure will chime in. Share this post Link to post Share on other sites
bt81camaro 0 #3 Posted April 7, 2014 I have had this problem intermittently before the pump and right after the pump change it worked fine. Now it does it all the time. Does not matter what valve I use. Share this post Link to post Share on other sites
dodgemike 52 #4 Posted April 7, 2014 Something is putting a real load on that system. Back in the dark ages several mfg.'s told you to pull a cylinder all the way back and hold it till the relief valve opened. Then keep it there! This warmed the oil quickly and put a load on the biggest diesel you could imagine. You could have a valve hanging, hose collapsing etc. Your best friend may be that pressure gauge installed in various places. Just like plbg. wherever hot water goes, so does the cold and a drain. You have pressure from the pump to your valves -hot. Then pressure to activate a cyl. hot again. Return is cold. Any time relief opens is drain. Do you know what the operating psi. is ? Sent from my SCH-S720C using Tapatalk 2 Share this post Link to post Share on other sites
dodgemike 52 #5 Posted April 7, 2014 I have been sitting here thinking about your problem. This system should not be eating pumps. If it does not have one you can by kits like at NAPA and plumb it into the big suction line. My gut is telling me you have a valve problem. Either from debris in the system or the valvebody has failed internally. This would allow high pressure oil to bleed over into places it is not supposed to be at the time. I am just thinking out loud here. I dont think another new pump will solve your problem long term. Cmon some of you other guys chime in here! Sent from my SCH-S720C using Tapatalk 2 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,499 #6 Posted April 8, 2014 What are the chances of the suction hose collapsing in this application? I've heard of it happening. The inner layer shuts off the flow and this can not be seen on the outside. Garry Share this post Link to post Share on other sites
MalMac 1,332 #7 Posted April 8, 2014 I had this same thing happen years ago. My problem was a quick disconnect failed. I would not allow fluid to pass in ether direction. I don't know if that is your problem or not. It sounds like to me you have got a total blockage somewhere that will not let fluid out of the pump. Thus putting a strain on your pump. Try just cracking open a line with oil coming out of the pump and give your control levers a slight bump to see if you get any movement or at least lets some of the load off the pump. Wrap a rag around the fitting you loosen to keep oil from spraying ever where. If you relieve some of the pressure and this allows the pump to free up and move then you know you are totally blocked somewhere. Just make sure you have that line wrapped and stay away from it as not to get blasted by any oil. This is just a shade tree mechanic process and not a prov en hydro test. I am sure someone who is way more knowledgeable will chime in here. Share this post Link to post Share on other sites
dodgemike 52 #8 Posted April 8, 2014 (edited) Garry, I had thrown that out in one of my earlier posts. It is hard to tell if one has delaminated unless you remove and inspect it. I was working on an old Ford back hoe years ago with no hyd. power. I gauged it at 2700 psi. Hmmm. Pretty good for an old machine. I removed the suction line from the pump. Ok there. Pulled the other end from the bottom of the main frame which held the oil. There was a filter suspended up in the oil! And it was caked solid. Changed the oil and filter and you could pick up the whole machine as high as you dared with the hoe. Of course no manual, no internet, no forums. It is a little easier to get info now. MalMac : great idea. I hadnt thought to ask that yet. Sent from my SCH-S720C using Tapatalk 2 Edited April 8, 2014 by dodgemike Share this post Link to post Share on other sites
stevebo-(Moderator) 8,534 #9 Posted April 8, 2014 I agree that it sounds like a blockage. Do you have an in line filter? If not I would highly recommend you install one. They are pretty easy to install. You can get one from TSC or other. I would check all the lines and make sure that they are not the issue but you can only tell when you are putting pressure on the system. I would then drain the entire system, install the filter and re fill. You may want to try and flush the system as well with something that will flush like something light. I do not know what you can use but someone here may chime in to tell you how to flush the system. Maybe diesel?? Here is the filter I installed on my ark a few years back. Share this post Link to post Share on other sites
Hodge71 665 #10 Posted April 8, 2014 I agree that it sounds like a blockage. Do you have an in line filter? If not I would highly recommend you install one. They are pretty easy to install. You can get one from TSC or other. I would check all the lines and make sure that they are not the issue but you can only tell when you are putting pressure on the system. I would then drain the entire system, install the filter and re fill. You may want to try and flush the system as well with something that will flush like something light. I do not know what you can use but someone here may chime in to tell you how to flush the system. Maybe diesel?? Here is the filter I installed on my ark a few years back. I think the diesel idea would be fine Steve as you're not going to be really lifting anything with it, just using its for its cleaning properties. Not sure I would be lift the arms or bucket as you will then fill the cylinders with diesel as well but I guess if you lower and curl you will then empty the cylinders as well.....oh and Steve...I just drooled all over my Macbook looking that that picture of your 18....maybe a bit jealous.... Share this post Link to post Share on other sites
shorts 182 #11 Posted April 8, 2014 Send me a pm with a phone number and a good time to call, so we can talk this thru Share this post Link to post Share on other sites
bt81camaro 0 #12 Posted April 12, 2014 I hope to have a chance to work on it this weekend. I originally thought it was the pump so a buddy of mine had a guy that worked for a hydraulic company look at the pump. The gears were scored so he recommended a pump change. I hoped that would fix my problem, but it did not. I will go through some of some of the suggestions this weekend hopefully and report back. Thank you all!!! Share this post Link to post Share on other sites
bt81camaro 0 #13 Posted April 13, 2014 Well yesterday I had a chance to finally get the horse out of the garage and start trouble shooting. I find the pto seems to be missing a clutch disk. So off with the loader so I can really get in there and work. As I pull the pto off I find bad bearings, missing pins in the bearing holder for the pressure bearing holder, and no disk at all on the front clutch. So loader tests are on hold until I can get pto fixed. Share this post Link to post Share on other sites
KC9KAS 4,744 #14 Posted April 13, 2014 Maybe all your problems are the PTO bearings and disc and not the loader. Keep your fingers crossed! Share this post Link to post Share on other sites
bmsgaffer 2,053 #15 Posted April 14, 2014 Just be careful, if the pump is locking up (for whatever reason), you will burn up the PTO and various parts in short order. Share this post Link to post Share on other sites
AMC RULES 37,196 #16 Posted May 3, 2014 Any updates...how's it going? Share this post Link to post Share on other sites
