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4230 hyd pressure spike

K

Kerry50

Member
My friend has a 4230. Last year he had the remote scv's rebuilt by a retired JD mechanic. This summer he has it hooked to his discbine and it blows a hose out of the remote. Later, the remote starts leaking so he has it rebuilt, again. Mowing it develops a hyd leak at the main pump. Blows out a o-ring on the cap which holds the piston. We bring it to the shop, get it fixed. Take it to the field, blows the same o-ring out again. He gets a gauge and we check the pressure at the remote, 2900 lbs. Again we bring it to the shop. I took the de stroke valve out and there was a washer under the spring. Put it back together without the washer and psi dropped to 1800. What would cause this spike in pressure?
TimS, he is ready to send the pump to you. Anybody had this happen before?
 
Why don't you adjust the pressure with the adjusting screw and leave the washer(s) alone???

How accurate is the gauge? does the pressure hold after being set with the adjustment screw?
 
Set the pressure at 2250 and see how it goes. The 4020 runs at 2250, I blew the seals out of planter cylinder running it on my 6610 at 2600 PSI.
 
The gauge is new. He has had this tractor for 10 years. The de stroke valve has never been touched in that time. When the tractor started blowing o-rings is when we checked the pressure and found it at 2900 psi. What caused the hydraulic pressure to spike? I left the washer out, that the previous owner had put in, and the hydraylic pressure dropped to 1800 psi.
 

Washer must have applied enough pressure to move sleeve(parts key 44) down just enough to raise pressure. I was thinking to remove that the sleeve in question has to be tapped out of pump with a hammer & punch
mvphoto26698.gif
 

My mistake in reading comprehension as I thought you stated removing de-stroking screw to access washer.

Have you tried adjusting stroke control valve screw to attain 2250-2350 psi??
 
Jim, my question is what caused the spike. The pressure was fine and all of a sudden it jumps to 2900 psi. What would cause this?
 
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