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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: T340A Crawler Hydraulics question

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Author  [Modern View]

11-16-2012 05:17:57

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On my TD340A I have the main 3 spool valve and then a valve near the back that is used for a scarifier. I had to put a diverter in the line to the back to change over to a detachable backhoe, which had its own controls of course. You really have to think through the plumbing carefully, and especially understand the logic of the return lines. Unless the valve is completely shot, you should be able to get some pressure. Regarding the flow, you should be getting at least 12 gpm from your pump and possible more (dpending on how the machine was configured), at a pressure of at least 1200 psi, maybe up to 2000 psi (I can't remember). Compare that with the requirments of your new device. It might have the power but just run slow. I upgraded my pump (easy to do) to run the backhoe faster.

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Bill Scharf

11-16-2012 07:53:59

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 Re: T340A Crawler Hydraulics question in reply to Charlie, 11-16-2012 05:17:57  
I've got the same set up you have but herein lies the confusion. The supply to aux valve comes from a port on the top of the main 3 spool valve. This port is directly above the return port to tank and the returns for both valves run to tee and back to tank. This appears to be a parallel supply to the aux valve. Normally it would be in series, unless there's a work after device in the main valve supply port to the aux valve. I rigged pressure gauges to the work ports on the aux valve and saw no pressure. Valves, fittings and lines all appear to be factory IH and match the IH IPLs. The blade hydraulics all work normally.

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11-16-2012 09:26:14

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 Re: T340A Crawler Hydraulics question in reply to Bill Scharf, 11-16-2012 07:53:59  
I remember working out exactly this issue long time ago. Don't have machine here to look at. You can take out plugs or disconnect lines to main valve to see part of internals. Pressure is on outside right; that's where I put a pressure gauge from time to time. You can also adapt a pressure gauge to any of those ports. Line to rear valve could be pressured all the time or only when front valve is not in use and feeds through open center. Will see tonight if I have anything in my notes in my manual. Feel free to email directly.

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