4230 with slow hydraulics update continued. Any suggestion.

Johnsdeere · Sep 28, 2014

JD 4230 with Syncro Trans. I have posted in the past about Hyd's slow. Very slow at the rear remotes and gets slower if steering is used. Had the JD tech out and tested the pressure for the clutch port etc. Trans lube pump is putting out 118 lbs at high engine rpm. Should be more like 180 lbs, zero lbs with clutch in. We checked the relieve valve it looks good and well as the gasket, o rings for the trans pump and tubes. Pulled the trans pump out looks ok still. Filter and screen were not plugged as well.

Ok so its all back together of course no change. Both remotes are slow a cylinder movers about 1/2 in 15 seconds, but everything works, speed of engine makes no change what so ever.

Checked clutch pressure with front pump destroke screw turned in and no change in pressure.

I have a line that comes from the steering valve that vibrates lots goes to side of trans area near clutch valve.

Anyone wanna take a stab at what could be wrong or what to test next? I do have the It manual and JD tech manual and we are not getting anywhere. JD tech is stumped as well.

buickanddeere · Sep 28, 2014

#1 Find a new tech
#2 measure flow supplied up to the front pump.
#3 trouble shoot to ensure the transmission oil pressure isn't being bled out through a failed pto brake or a stuck relief valve.
#4 Mother Deere sells high flow pumps to compensate for 39+ years of seal wear and seal hardening a well as shaft/drum sealing surface wear.
#5 you did not hear it from me but maybe a snort of the seal swelling fix in a can stuff. It may either either kill or cure?

TRANSMISSION OIL PUMP
(QUAD-RANGE AND SYNCRO-RANGE)

RE228724 KIT 1 (C) (D) (SUB FOR RE213662)

(C) SEE UPTIME KIT PAGE

(D) FURNISH COMPONENTS

newgenjdcollector · Sep 28, 2014

Question: Do you get any chatter or vibration like the pump is cavitating or no? If so, is likely a supply problem. If not, then only thing I could think of is the pressure control valve could be damaged/stuck, etc. On your tractor it's on the input line to the rockshaft. You could disassemble and check it. You didn't mention if your 3pt is slow that would be helpful to know.

tim s · Sep 28, 2014

so did you put a new trans. pump back in???

Johnsdeere · Sep 28, 2014

Thanks for the ideas. B+D I tried the Bigger
trans pump but it does not bolt up in my case.
Trans pressure doesn't change with PTO on or off.
Is there another way to test this?

Bob · Sep 28, 2014

Look at the post by "B&D"... #2 measure flow supplied up to the front pump.

If that flow is to "spec." you need to look at the main pump or for a HIGH PRESSURE leak-to-sump, as that would rule out the tranny pump and function return circuits.

Even with NO transmission pump flow, main hydraulics should work at full speed for a few seconds 'til the oil up front in the cooler and reserve tank are used up. (ASSUMING the tranny pump had already filled them.)

Johnsdeere · Sep 28, 2014

Put the old one in. Its not wore out yet and compared to the new one I had it defiantly was not bad. The hex shaft driving it has no wear as well. Had this tractor for 10 years. One day last winter at 10 below it started this on a cold start up. One day worked great next everything hydraulic was slow. I have a hard time believing a mechanical gear pump failed over night.

tim s · Sep 28, 2014

i'm thiking the stroke valve is stuck...

Johnsdeere · Sep 28, 2014

No chatter or vibration. Just slow.

Johnsdeere · Sep 28, 2014

If it had a leak to sump when I destroke the front pump the clutch test port should shoot up correct? there is no change though.

Bob · Sep 28, 2014

IMHO, I don't know why you would expect clutch pressure to increase???? LUBE pressure likely would, though.

The clutch pressure is set by the clutch pressure regulating valve and the excess oil that bypasses that valve goes to the oil cooler, then to the main pump.

If the front pump is not using it/is out of stroke, the cooled oil simply is returned to the transmission lube circuit.

Tx Jim · Sep 29, 2014

Johnsdeere
Temporarily remove pressure control valve(parts key 6) or check for sticking to see if it's blocking flow. Have you checked to see if stand-by pressure is at 2250 psi?

Tech 7 · Sep 29, 2014

Can you get a gauge into the Lube test port and let us know what the lube pressure is with the front pump in stroke and out of stroke?

David G · Sep 29, 2014

I would agree with Tim S, a slow no chattering system would probably be a front pump or stroke control issue.

WTW · Sep 29, 2014

Sir, Considering all previous test and finding/results I have to agree with Tx Jim. If you had a restriction at the priority valve you would have the symptoms you have. Recommend removing priority valve or better yet plumb flow rater directly to hydraulic pump pressure line and check pump flow. If flow is good you can suspect a restriction or leak in either the steering or rear rockshaft/SCV end of tractor. If low you can back up and look at /test transmission pump supply to hydraulic pump. A simple process of elimination by way of isolation. Good Luck DW

4230 with slow hydraulics update continued. Any suggestion.

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Bob

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