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left track slower than right cx36B

dennis e suffriti

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Jun 23, 2021
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mass.
Case must have gotten better on their pricing the kit use to be 3/4 of the cost of a whole travel valve.
I found a pilot travel valve from case in Ohio. I bought it even if its not my problem, was told there was only 4 in the USA very lucky
 

dennis e suffriti

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Jun 23, 2021
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mass.
Pulled the case drain hose on the slower side , lock the track and dead headed for 1 min. got exactly 16 OZ. of hyd oil, I think this is ok, case book say's 30sec's .40-.79 gallon is ok . I pressure tested the pilot solenoid valve, I think this is the high speed valve, any ways the valve had a test port to install a gauged , the book says you can use a gauged that go's up to 1000psi. The running pressure was a little over 505psi, book said any pressure at 505 psi or over is ok. I said early that the machine came with one newer track on it, the slower side is the side with the newer track , I going to swap tracks and see what happens, and will check under carriage, if I swap drive hoses, I have to get more hyd plugs,
 

dennis e suffriti

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Jun 23, 2021
Messages
26
Location
mass.
Hydraulic pressures for dead heading the tracks should be the same in both high and low speed.
John, you where right, I re tested final drive motors with a new gauged and pined track all dead head pressures where 3,300 PSI . Thank YOU
 

corey1980

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Sep 3, 2017
Messages
11
Location
Monmouth Illinois
John, you where right, I re tested final drive motors with a new gauged and pined track all dead head pressures where 3,300 PSI . Thank YOU
Dennis, you mentioned there were 3 pilot travel valves left in the states. I need one and my local case dealer can't find one. By chance do you remember who had them or get me in contact with the person that said there were 3 left. Thanks
 

dennis e suffriti

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mass.
Corey I bought it from parts@southeasternequip.com contact person Ted Persing 614-357-2017, It was a genuine case part, I did everything on line , didn't have to call , I was told by Rich Lobdell from wwwparts@townlineequipment.com that southeastern had three I bought one, The other case dealer on capecod mass. had sold there's . My I ask why do you need one did you find the problem, I am still scratching my head
 

dennis e suffriti

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Jun 23, 2021
Messages
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Location
mass.
Dennis, you mentioned there were 3 pilot travel valves left in the states. I need one and my local case dealer can't find one. By chance do you remember who had them or get me in contact with the person that said there were 3 left. Thanks
Corey I forgot the number for southeastern is 740-432-6303 / 740-446-3910 / 740-374-7479 that is what rich e-mailed [Good luck ], let me know how you do
 

corey1980

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Sep 3, 2017
Messages
11
Location
Monmouth Illinois
Corey I bought it from parts@southeasternequip.com contact person Ted Persing 614-357-2017, It was a genuine case part, I did everything on line , didn't have to call , I was told by Rich Lobdell from wwwparts@townlineequipment.com that southeastern had three I bought one, The other case dealer on capecod mass. had sold there's . My I ask why do you need one did you find the problem, I am still scratching my head
my travel levers don't center properly. They just don't feel right. From what I've gathered on this thread these machines had problems with those Pilot Travel valves. Being that mine does not have a cab and has sat outside since it was new prior to me owning it, I just wanted one on the Shelf in case I find a mess when I open it up since they're hard to come by. Thank you for the information.
 

dennis e suffriti

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Jun 23, 2021
Messages
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Location
mass.
Can any one help me and point me where I can get my final drive motors running pressures , free wheeling Thanks
 

John C.

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I've never seen where running pressures will tell you anything. It's the flow off the pumps that determine if a machine will run straight. If your travel motors are efficient, the swivel is sealed properly and the valves are opening to the same extent, then the balance on the pumps, if you have more than one, will need to be looked at.
 

dennis e suffriti

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Jun 23, 2021
Messages
26
Location
mass.
I've never seen where running pressures will tell you anything. It's the flow off the pumps that determine if a machine will run straight. If your travel motors are efficient, the swivel is sealed properly and the valves are opening to the same extent, then the balance on the pumps, if you have more than one, will need to be looked at.
John thank you, I pressure tested one of the main pressure lines going to the main spool valve, I dead headed with boom bottomed out the relief pressure was 3310psi, this case has one pump, 3 pressure lines two with a relief pressure of 3330psi [book says] the other has a relief pressure of 2900psi. The line I tested has the left travel spool , boom, bucket spools. I pulled track off on problem side and checked undercarriage every thing was good, ran sprocket only and could see it slower than right side , drained final drive very very little metal fines . If I am getting these pressures all pretty close or the same wouldn't that tell me my swivel seals are ok,and I put that new travel pilot valve in no change. All the relief pressures where the same low and high speed on both sides like you said they should be that there tells me my swivel is ok. good way to spend my vacation week. Any more ideas would be great, thank you for your help
 

John C.

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According to the Case advertising documents, your machine has two pumps within a single case. A photo of the pump might help in determining what exactly you have. Here are a couple of questions you can think about and test.

Which track is slow? Is it slow in both directions? Does the slow track change sides when you change direction? The best way to check the travel is to walk it up a hill with the sprockets on the down hill side. That will take more pressure to move the machine up the hill which will change the flow outputs on the two pumps and make the problem a lot more obvious. Write down which track is slow when you do this. Travel back down the hill and turn the carbody so the sprockets are at the front going up the hill. Write down which track is slow this time. Do you have any service literature for this machine? A service manual with a hydraulic schematic would sure help.
 

dennis e suffriti

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Jun 23, 2021
Messages
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Location
mass.
John ,left side slow, in both directions ,one pump two stages ,one stage runs all the higher pressure circuits , the other the lower pressure as in pilot circuits . Am I a little of right. I did have it on a steep embankment that's when I really knew I had A real problem . all ways the left side yes I have a repair manual and parts manual , the only other thing I can do is swamp my drive lines from each side and see if it follows to other side, I think this would tell me my final drive is bad, I really don't think its my swivel , whats your input Thanks for your time
 

gggraham

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I know that %90 of the time the travel valve was the problem if it didn't center properly I've seen lots of those. If it's still slow probably the swivel. Block the sprockets and remove the drain line compare the RH and LH sides if it's in spec then the swivel is the problem. Looks like you said it's in spec so time to think swivel.
 

dennis e suffriti

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Messages
26
Location
mass.
I know that %90 of the time the travel valve was the problem if it didn't center properly I've seen lots of those. If it's still slow probably the swivel. Block the sprockets and remove the drain line compare the RH and LH sides if it's in spec then the swivel is the problem. Looks like you said it's in spec so time to think swivel.
According to the Case advertising documents, your machine has two pumps within a single case. A photo of the pump might help in determining what exactly you have. Here are a couple of questions you can think about and test.

Which track is slow? Is it slow in both directions? Does the slow track change sides when you change direction? The best way to check the travel is to walk it up a hill with the sprockets on the down hill side. That will take more pressure to move the machine up the hill which will change the flow outputs on the two pumps and make the problem a lot more obvious. Write down which track is slow when you do this. Travel back down the hill and turn the carbody so the sprockets are at the front going up the hill. Write down which track is slow this time. Do you have any service literature for this machine? A service manual with a hydraulic schematic would sure help.
OK guy's I just crossed the main lines from main spool valve I switched the left foreword/ backwards lines to right side and right to left side, now the main spool valve in before the swivel , well the slow track crossed and it's on the other side now, well I know it isn't my final drive RIGHT, swivel rebuilding time?????????? thanks you guy's
 

John C.

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dennis e suffriti

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Messages
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Location
mass.
The ad sheet shows two main pumps and a gear pump. The two main pumps are handling the high pressure stuff with each pump feed one travel motor. The gear pump handles the pilot system and probably the back fill blade.

https://www.casece.com/emea/en-af/products/excavators/b-series-mini-excavators/models/cx35b

Your problem may be in the swivel but also may be the pumps being unbalanced.
John, I am going to test the other pressure line that feeds the right side track and other things , in the process of finding a rebuilding kit for swivel , can I balance the pumps the relief valve.
 

John C.

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You can only balance the pumps at the flow controls on the pumps. You need a flow meter to do that or knowledge of the pumps and how fast things are supposed to run plus knowledge of the regulators and which adjustment do what. It isn't something most operators would know about nor should they attempt to adjust. Most of the time when pumps are out of balance it's because something has gone wrong inside the pump.
 

dennis e suffriti

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Jun 23, 2021
Messages
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Location
mass.
You can only balance the pumps at the flow controls on the pumps. You need a flow meter to do that or knowledge of the pumps and how fast things are supposed to run plus knowledge of the regulators and which adjustment do what. It isn't something most operators would know about nor should they attempt to adjust. Most of the time when pumps are out of balance it's because something has gone wrong inside the pump.
OK John I pressure tested both p1 and p2 feed ports that feed left tracking and other's and right tracking and other's both relief valves pinned out at 3300psi there was a difference of 250-300 psi from left to right when I freewheeled the tracks in low and high speed . Could I be loosening that pressure in the swivel . All tests where done on p1 and p2 feed lines on test ports on main spool valve bank. I can't see any thing being wrong with pump that feeds the left side [slow side] because the boom works off same feed and I can pick up machine off the ground like nothing . I don't know
 
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dennis e suffriti

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mass.
The more I think about it is not the swivel ,I proved by switching the travel motors lines, the problem switched sides . Step in any body PLEASE, John feedback please.
 

John C.

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I don't know the lay out of the seals and lands in your swivel. It might mean that all you did was swap the pump on the lands in the swivel as well. Usually when the swivel goes bad the weak track will switch sides when changing direct of the machine so on first thought it doesn't sound like the swivel is the problem. I know that doesn't help you because the alternative is the pumps and you will need professional help with that.
Good Luck
 
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