My 580k was working well until last weekend when i blew the hose to the dipper. I replaced the hose and topped up the hydraulic oil and now (and maybe this is a coincidence) my hoe doesn't want to swing to the right "easily". It will swing to the left no problem but when it gets to say 2 o'clock it has a hard time going the rest of the way. It will eventually make it if i hold my foot on the pedal but you can hear the pump straining. Any ideas? Anything i should check?
One other piece of data. Because i blew a hose I lost a bit of Hydraulic fluid. I bought 4 litres of TCH and put it in. There is a glass level on the backhoe that tells you when its full or needs replenishing but its so darn dirty that it was hard to tell if it was below or above the glass level. Is it possible that i overfilled the hydraulic fluid. The manual says in bold lets to NOT OVERFILL... Thx Ron
Does not really make sense ??? …. But is there any chance that the new hose is blocked, possible collapsed when the fittings were installed ??? ….. this has been known to happen even by the best …… its a cheap easy quick check …..thats where id go first ….. jmho …. cheers
Perhaps - the new hose was for the dipper and not for the swing hydraulics. It's very wierd and can't see anything obvious. I even tried it with the hoe on a tilt so it would have an easier time with the swing to the right but it still struggled. I also attached a test guage to the main relief valve and mounted it semi-permamently (using twist ties) but i can't imagine this would have an affect - btw it pushed the test guage to 2500psi to get it to swing all the way to the right. I can easily disconnect the test guage to elminate that issue - otherwise i'm not sure what changed all of a sudden to give me this problem
The problem will almost always be related to the cam follower on the sequence valve. You should be an expert at this by now Ron..... Maybe in refitting the hose, it has been twisted up a little & making contact with the cam roller/ lever during swing right motion? Is the roller in contact with the cam all the time?
alrman. is on it, that's the place to start looking before you do any more testing, upper pin cam plate, roller, control arm linkage.
Okay thanks. Now to show my ignorance and naivity...where/what is the cam follower on the sequence valve? I'm assuming the sequence valve is the stack of valves that the hoses run out of. Not sure what the cam follower is though..... I've attached a picture that show where i changed the hose. THe hose is actually on the other side (i don't have a pic of the other side) and it attached to the bottom of the valve. If you could point out the cam follower that would be great. Ron
I thought I had assisted you with this problem once before & It someone else - sorry about that...... Here's a couple of threads that will help - HeavyEquipmentForums HeavyEquipmentForums
Thanks Alrman - this info is awesome. After reading the posts/threads I enlarged the area where the cam is (now that i know what a cam is) and seems to match your description where the prognosis is a flat spot or worn spot in the cam. I'm back up north tomorrow so will check it out. Looks like i need a new cam though...
Follow on...meant i likely need to get new cam roller. Could someone tell me the function of the cam roller and the really the whole assembly there....the diagram leads me to believe it plays a role in controling the hydraulic pressure as one swings far left or far right....understanding its function will help me understand better why the boom won't swing... Attaching sequence diagram so you know what i'm referring to.... Thx again
Yes that picture of the roller shows it has not been working too well. Replace the roller & clean the edge of the camplate & see how it goes from there. It may or may not, need a little tweek on the adjustment. Sequence Valve Operation/Adjustment The diagram below pictures the 180deg swing motion of a hoe. The sequence valve (mounted under the swing tower & connected to the camfollower) controls the swing cushioning at the far left & right. The design/shape of the camplate, welded to the bottom of the top pin, is a blueprint for the whole operation. The cam follower/roller follows the contour of the camplate. The shape of the camplate gives the swing it's characteristics of when to slow down & speed up. Built into the design, is a fixed amount of swing (pink) that cannot be adjusted in any way. By adjusting the control linkage, we are simply moving the pink area, more into one of the green cushioning zones. If we adjust it more to one side, say the left, the green area on the right side becomes greater - the pink area always remains the same. It only takes a quarter turn of the adjustment (#5) to make a difference to the swing control.So, if the roller is not functioning properly, ie seized with flat spots or the lever is binding, not allowing the roller to make proper contact with the camplate - the swing cushioning is thrown completely out of wack. I hope this helps. :drinkup
Excellent. Thx for the explanation. Much appreciated. Ron
Okay - so back from up north where the backhoe resides. First order of business when i was up there was to power wash the whole assembly and get a good look at the cam plate and cam follower. It was pretty greasy and full of dirt so cleaning it out definately helped but didn't completely solve the problem. While the cam plate is dented or nicked - the surface for the most part is smooth and the follower doesn't get stuck as far as i can tell....and the cam roller was completely smooth. As Alrman suggested i think i need to tweak the adjustment rod. So....next question is how does one go about turning the adjustment rod? Do i have to undo nut#6 (in diagram above). I've attached a couple of pics so you can see what i'm dealing with. Also - as you can see in the picture there is no nut that holds the adjuster arm to the crank level (bolt #7 in diagram above) but the diagram shows no nut either so maybe this is correct. Thanks in advance
Not 100% sure on the adjuster link on the centremounts Ron. Here, on the sideshifts, rod #5 has a hex on it & LH & RH thread on each end. So lock nuts #4 & #6 would be loosened & adjustment made. Looks like both might be RH thread, but I have noticed that #7 rod end description is LH thread,so will be the locknut (#6) so the proceedure should be the same as I have described. 1/4 turn needed & try the swing movement. You will have to try to lengthen the adjuster & try operation to see if it is better or worse, if it is worse, then try to shorten it & retry. Before you make any adjustments be certain the cam follower is turning freely - in your pic, yours does not look like it does. Also, be certain it stays in contact with the camplate for the full 180 deg swing process.
Swing Sequence valve adjustment 1) Swing the swing tower completely to the right. 2) Loosen the jam nut at the yoke and at the ball joint on the control rod. 3) Adjust the control rod until the cam follower will turn freely. The cam follower must just touch the cam or be within .020 inch from the cam. 4) After step 3 has been completed, shorten the control rod 1/4-1/2 turn. 5) Make sure that the clevis pin that fastens the yoke on the control rod to the spool eye in the swing sequence valve is in the vertical position. Note: if the clevis pin is not vertical after the jam nuts are tightened on the control rod, the control rod or the spool can be damaged. 6) Tighten the jam nut at the yoke and at the ball joint on the control rod. 7) Start and run the engine at 1/4 throttle. 8) Swing the backhoe completely to the left and to the right. The amount of cushion should be equal on both sides. Lengthen or shorten the control rod as required. The only adjustment available is to balance the amount of cushion between sides. Note: Adjustment instructions made are viewing from the backhoe operators seat, Lengthen the control rod to increase the right cushion (turn counterclockwise), Shorten control rod to increase the left cushion (turn clockwise).
I've run into this a few times. It has always been the bell crank the roller is mounted to sticking on it's pivot, or something else holding the cam follower off the cam. I would check all that real carefully before I started adjusting since this problem started suddenly. Swing as far as you can and make sure the follower is hard up against the cam.
Got it. Thx alot Alrman and sheepfoot. Will let you know next Monday after i return how things went