Mini 4 Wheel laoder- Yanmar?

hali63 · Nov 3, 2010

Greetings all , first time here.
I am in need of help identifiing my mini 4 wheel loader , It was purchased at auction a couple weeks ago . It says yanmar on back bumper casting , has yanmar 3cyl engine, steers from rear , has 4 wheel drive lever, manual shift .
Started to have shifting problems , hard to get into gear, clutch seemed to release ok .Went to shift, Now has no gears or hydraulics . Any suggestions as to what machine I have or trans suggestions . All I can find for numbers is T15W or Y15w not clear , rest is in Chinese? Help !

teg · Nov 3, 2010

You have photos that you can post???

winston1 · Nov 3, 2010

Here is one at an auction in Canada, may be yours. It's on a pdf so takes a few seconds to load. http://www.canadianpublicauction.com/wp-content/auctionfiles/22/CPA_Oct2010_Web.pdf

hali63 · Nov 3, 2010

Thanks Winston , yep thats the one I didnt get 2 weeks on it, grrr auctions!I will get more pics, I wonder why hydrualics & trans would quit same Time.
Tks
Gary

hali63 · Nov 3, 2010

Hi all ,
Here is some pics of this loader. Any help as to why tranmission & hydraulics quit together.
thanks for any identification

winston1 · Nov 3, 2010

I don't have a clue but wondering what kind of transmission does it have? Geared, hydrostatic, is it possibly hydraulic motor driven?

teg · Nov 4, 2010

I've heard auction companies have mechanics come in to make sure all the equipment is running for the auction. That doesn't mean it's fixed... I really think you would get a better response in the construction forum.

So, it went from shifting hard into gears to not engaging? What do you mean by "Went to shift, Now has no gears" Does the shifter feel loose? Again, construction form is better for transmission and hydraulics problems, IMHO.

20 20 · Nov 4, 2010

hali63 try over at the heavyequipmentforums they have a lot of knowledge on machines like this.

Kernopelli · Nov 4, 2010

hali63 said:
Greetings all , first time here.
I am in need of help identifiing my mini 4 wheel loader , It was purchased at auction a couple weeks ago . It says yanmar on back bumper casting , has yanmar 3cyl engine, steers from rear , has 4 wheel drive lever, manual shift .
Started to have shifting problems , hard to get into gear, clutch seemed to release ok .Went to shift, Now has no gears or hydraulics . Any suggestions as to what machine I have or trans suggestions . All I can find for numbers is T15W or Y15w not clear , rest is in Chinese? Help !

We really need more information. Sounds strange that its gear drive ("manual shift", "clutch") and hydraulics and trans went out at exactly the same time. Specs on Yanmars newer loaders say they are "hydrostat" transmissions..I'll bet this one is too. Since you had hydraulics then started having shifting problems then eventually everything quit, I am going to speculate whatever was causing shifting problems is what eventually caused the total failure. I don't know a thing about how your trans works but if it were mine and I had to diagnose it this way i'd guess that whatever valve(s)/hydraulic circuit is used to translate flow from forward/neutral/reverse would be a likely candidate in my book with what I know right now.

Here's some things I'd like to know.
Was there gears grinding, etc when you said it was hard to get in gear? Can you explain more about that.

How many gear levers does it have and can you move the shift levers or are they stuck?

Does it have a "shuttle shift" or similar type forward/reverse shifter separate from the 1st,2nd,3rd gear or Hi range/ Low range type gear shift? I was wondering if that was the lever on the left side of the seat ( don't see one on the steering column and I've never personally driven a wheel loader w/o some kind of quick forward/reverse setup on the column)

When you try to lift the loader, does it bog the engine down or do you hear anything unusual like a relief valve is opening?

No hydraulics are often are caused by a relief valve that is stuck open or a pump that has quit working. Can also be caused by obstructed filters or screens. I am going with shifting issues being the root culprit though. Maybe you have an a main relief valve open and that is why you have no hydraulics at all? Could be a shot pump? We'll get to that stuff. Let's get some info first.

careyo63 · Nov 4, 2010

What's up Darryl. Been awhile.
Excellent advice more or less the same thing I was thinking Also. Hyd. Pump. That will get him going on the right track in finding the problem.Had a friend that had a Trans.shop yrs. ago and know just enough to get in over my head

Carey

hali63 · Nov 4, 2010

Hi all , thanks , for your time, This all seems to fit , I am thinking this is a hyd clutch release not a clutch pedal as per, It probably wasnt releasing fully causing grinding in the standard trans gearbox, gear positions very sloppy, when shifted to third it might have jambed 2 gears locking transmission, do you think it might have a drive coupling somewhare sheared ? Could you comment on if this was a friction clutch the hydrualics would be driven off engine not trans, would this be correct? as mine quit all together.
Thanks all ,I will start dissassembling covers ,as soon as I can move it to a warm place.
If better, would someone more this to construction forum , all have been very helpful on this one. Sorry," New Guy"
Hali63:thumbsup:

teg · Nov 4, 2010

I'll ask a moderator to move it...

Bird · Nov 4, 2010

OK, it's moved.

Kernopelli · Nov 4, 2010

hali63 said:
Hi all , thanks , for your time, This all seems to fit , I am thinking this is a hyd clutch release not a clutch pedal as per, It probably wasnt releasing fully causing grinding in the standard trans gearbox, gear positions very sloppy, when shifted to third it might have jambed 2 gears locking transmission, do you think it might have a drive coupling somewhare sheared ? Could you comment on if this was a friction clutch the hydrualics would be driven off engine not trans, would this be correct? as mine quit all together.
Thanks all ,I will start dissassembling covers ,as soon as I can move it to a warm place.
If better, would someone more this to construction forum , all have been very helpful on this one. Sorry," New Guy"
Hali63:thumbsup:

Its definitely possible to do as you've described.."jam two gears together". With the tractors, it's usually not too hard to access the upper trans cover and get to the internals and see what's going on and get it lined out. I would assume that if it has a gear trans w/ friction clutch, it has a hydo pump driven off the engine. Once you get the covers off, this will all be obvious to you. I am baffled as to why a gear transmission and all the hydraulics would quit at the same time......unless this is a powershift transmission...which it kind of sounds like you do, which on the tractors uses the same oil reservoir ( but not the same pump) as the loader. Have you checked the hydraulic fluid level and the filter/screen?

tlbuser · Nov 5, 2010

Very likely that the hydro pump is driven from the output shaft of the trans. Or dependent on a couple of things, it may have a flex plate arrangement that has worn out.

hali63 · Mar 22, 2011

Hi all , update,
I found this loader has a drive shaft from motor to trans , (hydro), it has 2 tire type couplings on shaft , one is rotten- broke,other not far behind, I have checked everywhere to find these , say bridgestone on them ,bridgestone has no idea of them as there are offshore , yanmar also doesnt want to help either , they are small couplings molded to part of coupling.Inside of part has a spline to go to output of engine, this might be hard to match, wonder if yanmar coupling to output might be used somewhere else/
Might have to machine a new type flexable drive shaft.Insidespline is the problem on making one. Ideas dont want vibrations here.
Gary?

tlbuser · Mar 22, 2011

I've seen what your talking about, but can't think of where to source them by size. Maybe something like these could work.
http://www.lovejoy-inc.com/