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John Deere Tractors Discussion Forum

Chattering Hydraulics - Causes?

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Jon

08-06-2003 09:08:07

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Been living with this for a while and I would like to understand the causes.

I got an older JD410 that has loader chatter on lift and tilt. I recently rebuilt the Power Steering unit and the chatter was much reduced but still chatters a bit when full open, none when lever is just cracked open (slow lift or tilt).

Also, the Hydraulic pump looks like a recent reman unit and the backhoe works really good.

The Control Valve unit that gives priority to the PS was temporarily disabled (removed the spring) and loader chatter disappeared, but then the PS would drop out on lift (empty bucket). I haven't adjusted the shim pack on the Control Valve either. I should check pressures, but I don't have the gauges to do this.

So, generally what causes chatter, and in this JD410 case, what else can chatter the loader?

Thanks for the help

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Jonathan

08-06-2003 14:26:30

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Re: Chattering Hydraulics - Causes? in reply to Jon, 08-06-2003 09:08:07

The usual cause of a "chatter" in these systems is a problem where the front pump cannot be fed enough oil for the demand. The front pump...a radial piston pump cannot draw oil on its own. It must be fed from the transmission pump. So it could be an internal leak in the hydraulic system or it could be a problem with the oil being fed to the main pump. Start with the beginning.There is a suction screen in the transmission case thru which all the oil used must pass..With age the screen can get plugged with all sorts of debris. It is located behind that short hose that joins the return filter canister to the transmission case. Remove the canister assembly and remove the hose and fitting. The screen is about 1 1/4 in diameter and about 8 inches long...approx. and fits into the transmission behind that fitting. ..Drain the transmission first !!! Then buy a gauge ..has to be able to read 2500 psi and the appropriate hose and fitting to fit into the port on the front pump on the right side of the front cover of the pump. It will be the top port of two. After refilling the system, check the pump pressure. It should be in the 2300 -2400 psi range with nothing activated. Pull the loader lever back at an idle. the reading is what the pressure control valve is set at..Thats where you add shims etc to adjust...All this valve does is give the steering priority over the loader. Thats why the steering didnt work when you messed around with it. I forget what the pressure setting should be on that...Around 1500psi I believe..Thats adjustable with the shims. There are other things to check after this but lets see how you make out with the suction screen. And also if the standby pressure is low. (below 2300). After you check this stuff let me know and we'll continue from there !!! good luck

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