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DMC 3700 AC

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Grant

04-08-2003 19:53:01




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I've got a DMC 3700 Snow Cat (groomer) with a 10 way blade and four foot tracks. I'm using it to level peat / muck fields.

The hydrolic oil started heating up on me last summer. At first I thought it was the oil cooler plugged. I had it cleaned and moved to the back of the machine with an external electric fan. Changed the oil and new filters.

Unfortunatly, this didn't help. All I can get now is 20 min of back and forth ( no blade work) before the oil heats up (180 DF it doesn't want to turn).
The main pumps are Sun Strand 22 series and the drive pumps are Mico's. The Final drive is a Brevini(sp?)

Any Ideas what it may be?
Thanks

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Brokenwrench

04-09-2003 15:39:57




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 Re: DMC 3700 AC in reply to Grant, 04-08-2003 19:53:01  
The machine was designed to operate at temperatures around 32f or there abouts. The cooler was specīd for these temps. You will have to add an additional cooler, or a much larger cooler to accomodate operation in warmer temperatures. Your oil temperature should run in the 180 range,plus or minus 30 degrees to maintain optimum hydro. performance. If the machine is starting to malfunction, operating at these temps. then some pressure testing of components is in order.It could be as simple as a stuck relief valve. Or one of the pumps or motors could have overheated and started to flake off some brass or steel shavings, which in turn ran through the system causing pressure loss(s). The clearances in a hydro. system are measured in the 10s of thousandths, and it doesnīt take much of a score in a pump or motor to start by-passing oil, which in turn causes the oil to heat up, which heats up components,which opens up clearances even more causing even more heat. If you arenīt equipped with high pressure test gages,and adapters, you may want to farm the testing/repair out to a qualified hydroststic shop that has the specs. for your pumps and motors and can recomend the necessary repairs or rebuilding of components.

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Grant

04-09-2003 22:16:02




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 Re: Re: DMC 3700 AC in reply to Brokenwrench, 04-09-2003 15:39:57  
Thanks BR. That's what I thought I need to do. The machine was working well last year but it was getting progressively worse. I'll pull it appart and get my local HD mechanic to check out the pressures.



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