3-Point Hitch help with my 3 point lift

[alana1]

1992 Rhino 204
Seems like the 3 point lift is not right. I have had the tractor for a couple weeks and trying to figure out the 3 point lift. It kinda works for 2 mins after starting and then nothing. Not up or down, i tried the adjustment knob "i think" on the right side of the seat. You can hear the motor sag when lifting it, but its already at its highest point and in about 2 mins everything goes away. i changed hydrolic oil in tractor a few days ago and it didnt help. Everything else is perfect. Please any advice helps...... Owners manual is kinda grey around the troubleshooting.
Thanks

 

[Affordable]

My guess would be the o-ring or wiper on your 3-point piston is damaged causing the hydraulic fluid to pass by it,does it have a loader ? Power steering ?

Tommy
Affordable Tractor Sales
"Your Jinma Parts Superstore"
Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company

 

[greg_g]

i tried the adjustment knob "i think" on the right side of the seat.

That might be your problem. If you turned what I think you turned, that's a diversion valve. It diverts hydraulic fluid from the rear lift to elsewhere, usually to a remote line. Try turning it back the other direction.

//greg//

 

[RonMar]

What Greg said, turn it fully counter clockwise. Your description of "you can hear the motor sag when lifting it" sounds like the fluid is trying to be sent somewhere other than the 3PH cylinder(got any hydrolic fittings on the rear of the tractor?) and can't flow, so the pressure builds till the safety relief in the 3PH opens and allows fluid back into the resovoir. This loads the engine and quickly heats up the fluid...

 

[Diamondpilot]

Like the others said it could be you are sending the fluid to a remote or a bad seal. First thing I would do is with the tractor off turn the knob all the way in fully closed then open 1.5 turns. Start the tractor and give it a try.

Also you said you you changed the fluid. What did you use? It may be too thin since its working when you start and cold(thick), then thinning out over time due to heat.

Chris

 

[YukonKing]

Have you changed the hydraulic filter? I had a lot of issues with my 3 point not lifting. All problems were do to a restricted filter (dirt). Change the filter. If you still have a problem you may want to throw a pressure gauge at it. If the pressure is good then it's likely the filter. There are a lot of interesting threads on filter options. As far as how many micron and such. I am running a 150 micron before the pump and that is it. I think they came with a 20 micron. Fun Fun Fun.

Do you have a loader? Does it work?

 

[alana1]

Alright thanks, i will try a few things you guys suggested and see if it works. I got the manuals for the tractor in the mail yesterday, those combined with your suggestions should help me alot. The manuals are a little grey in some areas but not to shaby.
Thanks
No remote lines going elsewhere only a loader in the front and 3 point on rear. I used the John Deere hydrolic fluid for the smaller tractors i think it is a 40wt. I will check the bottle later. The hydrolic oil that came out was actually really good still but i changed it anyway.

 

[Smalljobs]

It's easier to trust the active members of this site before studying the manuals.

 

[alana1]

Sorry no disrespect meant. I think "we" fixed the problem, the adjusting valve on the front of the hydrolic package just needed some fine tuning like some of you guys mentioned. It works well up and down and now i just need to put those little "stops" in there appropriate places for fully up or down. Just a simple adjustment is all it was and hopefully i didnt ruin to much of the internals earlier when i was cranking on it. It was in the fully up position and i couldnt get it to go down and kept messing with it. As soon as i opened the adjusting valve a little more i was able to move it up and down.
Thanks everyone for your help

 

[Diamondpilot]

Glad you got it and it was a simple fix.

Chris

 

[alana1]

Well, i guess i spoke too soon. Kinda got it, now it works half the time and i am again troubleshooting the problem. Adjusting the adjuster and working the safety vavle and trying some stuff. I used the John Deere hydraulic fluid and mixed it with valvoline hydraulic fluid from NAPA autoparts, i hope this was the right stuff. Maybe mixing it was a bad idea, The guy behind the counter at NAPA said it was but there is no numbers on the jugs. What kind of hydraulic fluid is recomended for these tractors. Could it be the wrong stuff or too light or heavy. I will tear the system apart in a few days hopefully to find any issues.
Thanks

 

[YukonKing]

Alana,

Do you have a front loader? Does the steering feel fine? When you are in the up position on your 3 point control try lowering the front loader at the same time. Does the 3 point come up? The 2" knob between your legs slows down the fall rate of the 3 point. Filter? Have you checked it/changed it?

Or next option is mung in the diverter valve.

All of my issues have been to lack of fluid to the main pump. ie. Filter.

 

[YukonKing]

What RPM are running at? I have to hit about 1000 when my fluid is cold for the 3 point to work. I run AW32 Hyd fluid. Once warm it is better, at idle it will raise. Enough fluid must reach the diverter to then go the the 3 point.

On mine the loader always works as it is in line before the diverter and 3 point.

 

[alana1]

Yes i have a front loader, filter is clean, the loader gets kinda jerky from time to time going up and i tried moving the loader and the 3 point at the same time. It's weird, the 3 point works 50% of the time. I will check the internals in a few days for gunk and bad seals and stuff. The diversion valve i am still unsure what that is and where its located. maybe it is on the divider block on the hand control for the loader. It does not have power steering unfortunatly. YukonKing says AW 32, i will see if thats available here in town.
Thanks again for your help, keep it coming if you want. I love this little tractor project, its a cool rig to play/work with.

 

[greg_g]

Could it be the wrong stuff or too light or heavy. I will tear the system apart in a few days hopefully to find any issues.

If there were "no numbers" on the container, odds are good that it's the wrong stuff. I think we pretty much established in your other thread that you want AW32 (or ISO32) hydraulic fluid. Nothing else. If it don't say AW32 or ISO32 on the container, it ain't the right stuff. AW32 is about 10 weight. If you live in a climate that's warm year round, you could go up a step to AW46/ISO46 - which is just barely 20 weight. Next step up is AW64/ISO64, at just under 30 weight. I use my tractor in all weather and all conditions, so I stick with AW32 year round.

//greg//

 

[Rich Waugh]

If you don't have power steering, you shouldn't have a diverter valve - its purpose is to divert hydraulic flow to the steering whenever it is needed. No PS, no need for hydraulic pressure there, right? Thus, I would say that all your pump is doing is running to the loader valve and then to the TPH, or the reverse order. Mixed oils means you have no idea what you really have and that is not good.

AW32 hydraulic fluid is probably what you should be running. I'm in the (mostly) temperate tropics and I run AW32 or UTF with no problems at all, no matter how hard I work things. I'd suggest draining the hydraulic fluid completely, then flushing the system with some kerosene for a few minutes of operation of the controls. Then drain out all the kero and pull the filter and take the top off the hydraulic sump so you can get at the pickup screen. Once you're sure the screen isn't clogged with debris and the sump is free of crud, then install a new filter, button things up and fill it with AW32 hydraulic fluid.

Best of luck with it.

Rich

 

[greg_g]

Had to do a little diggin' through your old posts, but it appears you're in the Pacific Northwest. In that case, definitely stick with AW32/ISO32 hydraulic fluid. It will be much thinner than whatever that duke's mixture is you have in there now. And don't forget the suction screen inside the sump. Odds are good it needs at least a good cleaning, perhaps even outright replacement.

It would help us help you more quickly, if you'd flesh out your profile.

//greg//

 

[alana1]

Yeah Greg, Whatcom County area, northwest Washington it gets flippin cold up here. Today was 28 degrees at 4 am. Summer gets as high as about 85 but that probably wont be a problem. AW32 is what i will use.

 

[RonMar]

I am up in Port Angeles and have been running AW-32 in mine for years without any problem.

 

[alana1]

Sounds like AW-32 is the stuff. Now if i could just figure out how to get rid of some of my older posts to shorten up this thread. Any ideas?