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Old 02-28-2012, 11:45 AM   post #1 of 25
apewrangler
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Default 4230 Hydraulics Stopped Working

Got a 4230 with a front loader. Worked all day Friday hauling dirt in the loader with no issues. On Saturday, the U-shaped hose between the hydraulic pump and cooler blew out. We just cut the end off, put it back on, and topped of the fluid. Ran the rest of the day with no problems.

Yesterday, my dad was using it to scoop up some grass. He backed up some and changed gear to go back forward and all the hydraulics quit working - front loader, three point hitch, steering and transmission. There was no leakage from anywhere and no out-of-the-ordinary sounds.

The pump turns freely and makes a gulp-like sound as if the shaft is still in tact. There's just no fluid going to or from the pump. With the tractor running, there just doesn't appear to be any pressure in the system.

Any help is greatly appreciated.

Andy
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Old 02-28-2012, 03:47 PM   post #2 of 25
Tx Jim
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Default Re: 4230 Hydraulics Stopped Working

Did you check the frt hyd pump coupler is see that it's not stripped??? Next if it has a Quad-Range or Syncro-Range trans remove 3pt center link attaching bracket and plug under the bracket. Pull trans hyd pump drive shaft and look for rounded off corners on the hex shaft. How long since trans filter was changed and sump screen cleaned.
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Old 03-01-2012, 05:07 PM   post #3 of 25
apewrangler
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Default Re: 4230 Hydraulics Stopped Working

Removed the 3-pt center link to find the trans hyd pump shaft bent and jammed. Can only get a good hold of it with needle nose vice grips, but it ain't going anywhere. What now? Will turning ove the engine help to free it up?
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Old 03-01-2012, 06:34 PM   post #4 of 25
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Default Re: 4230 Hydraulics Stopped Working

From what you stated, the transmission pump may have seized for some reason. You'll have to remove the rockshaft(lift housing) to inspect.

The transmission pump has two functions. It lubes the transmission shafts and also supplies charge oil to the main pump. When the trans pump stops pumping, the tractor will loss all hydraulic functions.

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2009 JOHN DEERE Z445, 54" Deck
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Old 03-02-2012, 03:39 PM   post #5 of 25
Tx Jim
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Default Re: 4230 Hydraulics Stopped Working

I think you're going to have to remove the rockshaft housing and look at trans pump. When you remove RS housing you can attach vise-grips on shaft and try to tap hex drive shaft to the rear.
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Old 03-02-2012, 07:06 PM   post #6 of 25
apewrangler
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Default Re: 4230 Hydraulics Stopped Working

Dug into it today. I was able to see the crack in the trans hydr pump through the shaft access hole. We got the rockshaft housing loose but not out. First thing in the morning, we are going to have to modify the cab floor support bar to make room for the for the front of the RS housing. It's hitting right in front of where the dipstick tube is.

There is some sort of lever arm hanging down. That and the dipstick tube seem to be the only two things that would keep it from sliding right out. The tube looks bent enought to keep it from just pulling out the top.
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Old 03-02-2012, 10:54 PM   post #7 of 25
jd110
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Default Re: 4230 Hydraulics Stopped Working

If you remove the rear cab mount bolts, you should be able to raise the rear of the cab enough to remove the rockshaft.
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Old 03-03-2012, 08:02 AM   post #8 of 25
Tx Jim
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Default Re: 4230 Hydraulics Stopped Working

I agree with jd110 to jack back of SGB up. A cherry picker or forklift with a stinger on it is a good way to R&R RS housing. Be careful with the L/D cam(parts key #8)& mechanism.
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Last edited by Tx Jim; 03-03-2012 at 09:41 AM.
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Old 03-04-2012, 07:31 AM   post #9 of 25
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Default Re: 4230 Hydraulics Stopped Working

If you have access to a fork lift, place the forks under the lift arms.
When you lift the R/S, reach under and fold the L/D cam forward. Also, if you have the cab floor removed, you can lift the dipstick tube out of your way. Note the clamp(#8 in diagram) holding the tube to the top of the R/C housing.



Good luck,
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2009 JOHN DEERE Z445, 54" Deck
1973 JOHN DEERE 401B Industrial Tractor (2030)
2008 JOHN DEERE LA125
1971 JOHN DEERE Model 15 Chain Saw
Precision Classics Die Cast JOHN DEERE 4020 Power Shift , No. 5549, S/N 2565U
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Old 03-04-2012, 05:30 PM   post #10 of 25
apewrangler
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Default Re: 4230 Hydraulics Stopped Working

We ended up removing the floor, seat, and the sheet metal around the seat and used the cab "roll cage" as a support and a come-along to jack up the RS about a foot.

The pump manifold was broken and the shaft was wedged in the pump.

Now, any suggestions on where to buy a new manifold and pump?
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Old 03-04-2012, 07:09 PM   post #11 of 25
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Default Re: 4230 Hydraulics Stopped Working

You'll need to find out what caused the damage.

Just a thought.
When you're looking around, check the differential bevel gear shaft(#18). I've seen the cap screw(#9) break. This causes the pin(#18) to move out of place. The pin wipes out the transmission manifold and pump.



For parts, try Southern Tractor.
Canton, MS.
Bolton, MS.
Hattiesburg, MS.
Summit, MS.
Mendenhall, MS.
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2009 JOHN DEERE Z445, 54" Deck
1973 JOHN DEERE 401B Industrial Tractor (2030)
2008 JOHN DEERE LA125
1971 JOHN DEERE Model 15 Chain Saw
Precision Classics Die Cast JOHN DEERE 4020 Power Shift , No. 5549, S/N 2565U
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Old 03-04-2012, 08:40 PM   post #12 of 25
apewrangler
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Default Re: 4230 Hydraulics Stopped Working

Thanks for the tip. Judging by where the shaft was bent and the extent of the bend, that sounds just like what happened. It's just not obvious the way it sits. Will definitely explore that further.

I failed to mention that I dropped a half inch combination wrench into the differential when I was removing the pump. That took about 4 hours to dig out.
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Old 03-05-2012, 07:43 AM   post #13 of 25
Tx Jim
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Default Re: 4230 Hydraulics Stopped Working

Here's JD's prices for comparison. I didn't find a pump offered in A&I.
R50825 SHAFT,TRANS OIL PUMP DRIVE ADD 92.00 USD
AR75648 PUMP,TRANSMISSION OIL,ASSEMBLY ADD 728.00 USD(INCREASED CAPACITY, COMPLETE PUMP)
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Old 03-05-2012, 08:11 AM   post #14 of 25
apewrangler
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Default Re: 4230 Hydraulics Stopped Working

$728 !!!!!!!!!!!

Looks like I'll be getting two shafts.
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Old 03-05-2012, 08:19 AM   post #15 of 25
apewrangler
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Default Re: 4230 Hydraulics Stopped Working

The number on the manifold is R51674, and the pump is R50846. Is AR75648 a newer eqivalent part number? I don't seem to have much luck googling the "R" part numbers.
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