JD 4450 Clutch Valve Pressures

magnessqh · Sep 20, 2018

Just purchased a 4450 and Hydraulic pressure is bouncing between 1400 and 2500. Pressure at the inlet of the clutch valve housing is 150 static. Pressure at the cooler exit is bouncing between 30 and 50. Is this probably a problem with front pump or the pressure release valve in the clutch housing? These pressures are at idle rpm's and there is a video attached. Thanks so much!

Bob · Sep 20, 2018

My GUESS would be a front pump issue, or some strange problem in the high pressure circuit that's making the pump go in and out of stroke.

Before condemning the main pump, check for heating at all valves on the high pressure side... the brake valve, steering valve, all SCV's, and the hitch valve (if used).

johnyquest69 · Sep 20, 2018

Had a 4430 that would start out good pressure and then lower. Per Tim S after he received the pump it was very erratic. Crank case outlet valve was stuck on the pump.

magnessqh · Sep 21, 2018

(quoted from post at 10:38:59 09/20/18) My GUESS would be a front pump issue, or some strange problem in the high pressure circuit that's making the pump go in and out of stroke.

Before condemning the main pump, check for heating at all valves on the high pressure side... the brake valve, steering valve, all SCV's, and the hitch valve (if used).

I ran it a while and not drastic change anywhere in temperatures. I will pull the pump this weekend and let you know what I find in it. Thanks, John

magnessqh · Sep 21, 2018

JD 4450 Clutch Valve Pressures

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