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JD2840 hydraulics

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Tim [Ga]

12-27-1999 16:55:47




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Got a JD 2840 that when the hydraulic get to operating temp the steering drifts and the hyd functions are jerky. I have changed the hyd. filter and fluid and no change. Any help would be appreciated. Thank you




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Steve

12-27-1999 22:04:01




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 Re: JD2840 hydraulics in reply to Tim [Ga], 12-27-1999 16:55:47  
You need to plug gauges into the pump and see if the charge and standby pressures are normal. I would guess that charge pressure should be somewhere around 50 psi, with a slight dip when a high pressure circuit(steering or 3-point) is activated. Standby should be 2300-2500 psi at 1500 rpm.



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david al

12-28-1999 11:25:46




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 Re: Re: JD2840 hydraulics in reply to Steve , 12-27-1999 22:04:01  
remoe the hood. above the hyd. pump there is a tank connected to th top of the pump.
run the tractor until the problems occur, shut off the engine and remove the plug with valve from the top of the tank.put a 10"rod or screwdriver in the opening in the tank like a dipstick,to check the oil level in the tank.
if tank is full,you probably have a problem with your main hyd.pump
if the tank is empty,you have either a supply problem in the low pressure circuit or a leak in the hige pressure circuit.to determain which:plug
the outlet of the main hyd. pump, run the engine at low rpm and check oil level in the tank a few times. if level is rising the supply is ok and the problem is in the high pressure circuit.if the level does not rise or rises very slowly,the problem is in the low pressure circuit.
(if level is rising remember to shut off the engine befor the tank overflows.)
david

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