Tracking problem

Midwayretriever · Feb 10, 2020

Link belt 330 2006 model
7200ish hours
Been working fine, cranked yesterday, tracked about 30 yds, started drifting. Left track pretty much quit in forward

Dave Neubert · Feb 10, 2020

Check your pressures and check the flow of the case drain on that track

Midwayretriever · Feb 10, 2020

Pressure according to diagnostic screen coming from pump, is good/normal. If you’re saying to check pressure somewhere else, I wouldn’t know where to do it. Or are you saying to check it at case drain?

John C. · Feb 10, 2020

You mentioned the problem in forward. Is it not there in reverse?

Midwayretriever · Feb 10, 2020

Sorry, incomplete description... reverse operates just like it should. If I take pressure of the track, it will move in forward direction, but very slow.

Dave Neubert · Feb 10, 2020

check to see if the motor is bypassing oil out of the case drain. and I did not catch the problem only in forward is it the same in reverse

Dave Neubert · Feb 10, 2020

that rules out a travel motor maybe pilot pressure from joy stick or control valve problem

Midwayretriever · Feb 10, 2020

Yes sir my fault. Wasn’t clearly explained

John C. · Feb 11, 2020

I think I'd look for dirt under the pedals first thing but the problem really sounds like the swivel is bypassing on that particular seal. You might check case drain at the top of the swivel moving the weak track in the forward direction. Sometimes the slow track will switch sides going in the opposite direction as well. Just depends on the order of seals in the swivel joint.

Dave Neubert · Feb 11, 2020

I have found when you have a bad swivel the tracks will counter rotate but not drive the one track alone try that 8000 hrs it is normally time to do the swivel any way

Midwayretriever · Feb 11, 2020

Not in the pedals as far as I can tell. That was the first thing I checked. At the risk of outing myself , when you say swivels, I’ve got no idea what you’re talking about. Don’t run this thing for a living, just keep it here at our place for a major clearing project. Reasonably mechanically inclined, but not super experienced working on equipment, so don’t know all the terminology, or location of different systems. Usually just have to figure it out tracing lines ect.
to me it acts like:
1. There’s a bypass stuck open letting oil circulate
2. Filter/screen clogged , causing same as above
The machine doesn’t bog down at all, so doesn’t act like it’s deadheading somewhere.
I appreciate all the insight , and help I can get

after quick research ... didn’t realize what you where talking about , but do now. You mean the the motor that actually spins the superstructure itself? What should I be looking for, leak, low fluid?

John C. · Feb 11, 2020

The swivel is a rotary manifold that routes oil from the rotating house down through the center of the machine and to the travel motors. If you look just in front of the swing motor you will see a group of hoses connected in the center of the machine. If you can watch that while the house turns, you will see that they all stay in place with the house. If you can see below that, you can see the bottom section stays will the carbody. Judging from your comments, you should probably think about contacting a knowledgeable mechanic to give you a hand and some schooling on how the machine works and troubleshooting the problem.

Midwayretriever · Feb 11, 2020

Can’t disagree about needing knowledgeable mechanic. Problem is there isn’t any out here. Closest one is about 200 miles away, and isn’t real interested in helping out. So at this point, I’m stuck doing it myself

Midwayretriever · Feb 11, 2020

As a side note since swing motor was brought up. Usually operate in free swing mode. If not, the machine feels like it’s fighting itself a little when rotating. This is fist linkbelt I’ve ever run , so maybe that’s standard. All the rest I’ve been in didn’t feel that way. Not sure if relevant/related or not

John C. · Feb 11, 2020

Free swing is just that. Start the house turning and let go of the control and the house will keep on going. In standard mode the hydraulic motor has dynamic braking with the hydraulic oil. Let go of the control and the house will stop turning pretty quickly. What you might try to check for a problem is get the monitor panel in the mode that will show the engine RPMs and see if they drop down a bunch when you have the house turning full speed in standard mode.

posrepair2013 · Feb 12, 2020

Sounds like rotary manifold issue. It's can be dangerous if u dont know what you are doing. but u need to pin track that wont go forward (install something solid in between sprocket and track frame) lift up opposite track with boom and try and drive pinned track forward.
If manifold is bypassing ur track that's in air will move.

Midwayretriever · Feb 12, 2020

Appreciate the info on testing. So assuming that the trick works, what the diagnosis, and what’s the theoretical fix?

posrepair2013 · Feb 12, 2020

If the track moves that means the rotary manifold is leaking internally.
Manifold will have to be removed disassembled and resealed

John C. · Feb 12, 2020

Nice little trick if the leaker is next to the opposite side track. What happens when the leaker is next to the case drain port or the same side return? Now that I think about it, most travel spools now days close A & B ports when in neutral so how is the opposite track going to move if there is no return circuit? It's something I'll have to try in the future. In times long ago we would remove a hose next to the suspect and pressure the circuit we thought was leaking but pumps put out a lot more oil now days.

TVA · Feb 12, 2020

Id check pilot pressure right at actuator for forward movement first.

Tracking problem

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