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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD 350B clutch Question

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JoelD

09-17-2006 03:39:20

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Hi all,
I have a JD 350B dozer, 2500 hours.
I am new to the machine. When pushing, and hitting a rock or root, the machine will stop and the tracks will not spin.
The machine turns very well, no issues noted.
The machine has the hydro reverser (shuttle shift).
I assume the machine has stearing clutches, one for either side, assume it also has a drive clutch, one between the motor and tranny.
I am thinking my issue may be drive clutch. Looking for help to determine if all is adjusted correctly. Any help would be greatly appreciated.
Finally, and advice which and where manual to purchase would also be appreciated.
Thank you,
Joel

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lAVOY

09-20-2006 12:30:37

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Re: JD 350B clutch Question in reply to JoelD, 09-17-2006 03:39:20

Any good auto parts store should have a "master" oil pressure gauge.
One other thing that was told to me by a lifetime Deere mechanic that did a lot of work with 350's is sometimes the piston rings in the reverser will cause a slight ridge in the bore. When they do this, sometimes the reverser will not engage all the way and will slip. We are having a slippage problem on our 350B right now. All the pressures are on spec, and once the reverser fully engages, it will kill the engine dead, but it is slow to engage. One thing the mechanic recommended is to speed up the shift speed a little bit, that can sometimes alleviate the problem somewhat. Don't go so far that it is violent, just speed it up some.
Lavoy

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JoelD

09-25-2006 14:11:25

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Re: JD 350B clutch Question in reply to lAVOY, 09-20-2006 12:30:37

did notice the shift speed on the reverser engaging is not all that quick, slow actually, I'll change out filter and fluid, check preasure and then based on how it opperates, speed up the shift a little bit. Any advice on how I find that screw head? My service manual references it but does a poor job of pointing out exactly where to find.
Thanks again. Will be doing all hyrdo fluid, tranny fluid and motor oil and filters while I'm at it.
Joel

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jdemaris

09-20-2006 13:39:08

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Re: JD 350B clutch Question in reply to lAVOY, 09-20-2006 12:30:37

We had suspicions along the same line whenever we got a reverser with the problem as you describe it. Can't say I've ever been inside a reverser when it was running to witness the problem, however. I can say that we had similar "sticking" problems in the older 1010 and early 350 reversers with metal rings, and also in the later or updated reversers with mostly rubber rings. It often appeared to be caused by every sealing area being generally worn out. We also had what seemed to be the same problem with MANY 350Cs when they were brand-new. We tore several down and could see nothing wrong with them. As standard procedure, we'd increase the rate-of-shift to a point where a full-throttle forward-to-reverse shift could almost break your neck. Ended up we fixed many of them by changing the length of the stop-bolt inside the shift accumlator. It's a threaded bolt and nut and determines the length of stroke of the accumulator piston travel. I cannot remember if we shortened it by a few threads, or lenghtened it - but I'm pretty sure we shortened it. In fact, Deere Company - from our Syracuse headquarters gave me the "Golden Belt-Buckle" award at the time for fixing a few of them. In case you're wondering, that's a bogus little award Deere Co. was handing out for awhile to shop grease-monkeys who suceeded in fixing a problem that their field engineers had not yet figured out.

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09-17-2006 10:06:58

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Re: JD 350B clutch Question in reply to JoelD, 09-17-2006 03:39:20

I should be able to help you with a manual . Send me and email for my link.

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Lavoy

09-17-2006 09:58:10

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Re: JD 350B clutch Question in reply to JoelD, 09-17-2006 03:39:20

Reverser crawler has no drive clutch, so that can't be it. It is either the reverser slipping, which I would bet on, or both steering clutches have to be slipping at the same time.
Change the reverser filter and fluid, and then check all of the pressures to make sure one is not under spec.
Lavoy

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JoelD

09-18-2006 12:48:44

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Re: JD 350B clutch Question in reply to Lavoy, 09-17-2006 09:58:10

Lavoy,

Thank you, after much searching last night I understand what you"ve written. There is a seperate pump for the reverser correct? and the hyrdo preasure to the reverser is critical, correct, that"s why I"m checking preasures? Hydro preasure to the reverser clutch?
What type of gauge would I use.
I think you are probably dead on. Should I use hydro fluid for the reverser fluid? Is that the tubular dipstick near my right foot?
Thank you,
Joel

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jdemaris

09-19-2006 09:25:23

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Re: JD 350B clutch Question in reply to JoelD, 09-18-2006 12:48:44

The clutch pressure should be at least 120 PSI with a dry-steering clutch machine. A grease-gun hose attached to a gauge will work fine (with 1/8" male pipe thread. When the 350C series came out - with hydraulic steering clutches for the first time - the reverser pressure was jacked up to 150 PSI since the same oil that runs the reverser clutches also runs the steering clutches - and the steering clutches will slip at 120 PSI.
There are two test ports with 1/8" plugs on top of the control valve. One is for lube/release pressure - should be around 20-30 PSI all the time, and the other is main clutch pressure - 120 PSI and up. Reverser can use any good combination hydraulic/transmission oil. It's unlikely that your reverser is slipping -but you can check by looking at your ring-gear when the machines stops. If the ring-gear is still moving, then you know for sure that the steering clutches are slipping. Some early 350s use a spring-dampened drive-disk that can break, and 350s also sometimes lose the splines on the reverser output shaft and transmission input shaft - but those sorts of maladys are usually a "go" or "no go" situation, and not slipping.

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JoelD

09-19-2006 10:41:00

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Re: JD 350B clutch Question in reply to jdemaris, 09-19-2006 09:25:23

Thank you very much.

when I pulled out the dip stick on the reverser hydro fluid, the one near my right foot. It smelt burnt, terrible smell, reminded me of my motocross days and motorcycle clutch packs.

I am wondering if maybe I did not have the machine throttled up enough and therefore not enough preasure, not sure if the preasure is proportional to throttle in anyway?

I'll replace the reverser fluid and filter and check the preasure and see where I'm at.

Any advice on changing the filter and fluid? I have the full belly pan on the machine, not sure if that will get in the way, any advice on locating the filter. Have not gotten manuals yet, they are on the way.

Joel

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jdemaris

09-19-2006 15:52:18

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Re: JD 350B clutch Question in reply to JoelD, 09-19-2006 10:41:00

Filter is on the side of the reverser held on by a cast-iron cover and four bolts. It's a "throw-away" paper cartridge. You can reach through the track and belly-pan to get to it. Total change will be less than 3 gallons. The clutch pressure of 120 PSI is a constant regardless of RPMs.

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JoelD

09-19-2006 19:41:39

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Re: JD 350B clutch Question in reply to jdemaris, 09-19-2006 15:52:18

Thank you very much.
I will pull out this week after I buy a new one at JD dealership. I really appreciate the responses.

I am hoping it might be a dirty filter. In process of purchasing an oil gauge to measure preasure, I have a hydro gauge on my kubota backhoe, but it's a 5000psi gauge (hoe runs up to 3000) and not sensitive enough to give me a good read.

I'll get a 0-150 or so and that should give me a good read. Any thoughts on were to find gauge, looking at Northen Now.

Again, thank you very much,

Joel

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