Loader Hydraulics

[yanmar1948]

I'm new to this site....have a yanmar ym2010 with non-functioning hydraulics....fluid level is ok....no apparent leaks and color, smell, consistency, etc appears normal....lost use of back blade and front bucket all at once....suspect a bad pump.....any ideas?

thanx.....

 

[clemsonfor]

I'm new to this site....have a yanmar ym2010 with non-functioning hydraulics....fluid level is ok....no apparent leaks and color, smell, consistency, etc appears normal....lost use of back blade and front bucket all at once....suspect a bad pump.....any ideas?

thanx.....

Crack your pressure line somewhere down it and see if you have a flow or spray of fluid. This will tell you if the pump is bad or sheared.

 

[yanmar1948]

I have already opened the lines coming out of the pump.....there was no leakage.....could it be anything else, e.g. the controls under the seat?

thanx....

 

[careyo63]

Fluid going to the pump? Filter Clog,Enough fluid Etc.



Carey

 

[J_J]

Is the hyd fluid correct? If you have a reservoir full of fluid, and the pump is good, then if you crack or remove a hose off the pump pressure side, fluid should come out. If fluid is missing, then no fluid to flow. If shaft is twisted off, no pumping action. Is there any water in the hyd fluid that might have froze. Check filter. I know it is touching 20 degrees here in North Florida at night .

 

[bruce1966us]

Pickup screen clogged or pump key sheared...

 

[MichKubota]

This time of year I always suspect water in system and freezing. If you suspect this may be issue, get tractor in warm place and try again.

 

[Ductape]

Pickup screen clogged or pump key sheared...

My first thoughts also......................

 

[yanmar1948]

if it is the pump, can it be repaired....e.g. does it have a shear pin on shaft?

anything specific to be done with the fluid when removing the pump?
does it have to be drained?
is "bleeding" the system necessary when hooking back up?


thanks......

 

[winston1]

Did your system overpressure when things quit working. Like closing the stop valve or anything like that? Yes the pump has a key. Yanmar Tractor Parts: HYD. PUMP SHAFT KEY_ No, you do not have to drain the fluid to remove the pump. I believe if I were you I would drain the fluid and check the strainer before pulling the pump, especially if you did not experience any over pressuring.

 

[yanmar1948]

the hydraulics (bucket, back blade) stopped working all at once.....could it still be the strainer?

thanx

 

[winston1]

the hydraulics (bucket, back blade) stopped working all at once.....could it still be the strainer?

thanx

Doesn't sound likely. No over pressuring when this happened? Seems stange a key would shear in normal operation. Based on your sudden stoppage I would think pulling the pump may be needed.

 

[yanmar1948]

please explain over pressuring....(I am familiar with the stop control knob under the seat).....

thanx

 

[winston1]

please explain over pressuring....(I am familiar with the stop control knob under the seat).....

thanx

Over pressuring is when your pump is dead headed. Could also be defined as when your loader valve is held as cylinders reach the end and you hear the loader relief valve going off. If the stop valve under the seat is closed and you pull your 3 point lift handle back this can overpressure the hydraulics. A gear pump knows no limits on pressure, if there is no relief devise the first thing to give is the pump drive key.

 

[clemsonfor]

pull the pump. That would be what i do. IF its ok you put it back on and search some more. Its a few bolts on each line then 4 bolts that hold it to the engine, should not be a hard task.

 

[yanmar1948]

thanx, I will pull the pump....

 

[yanmar1948]

I pulled the pump....shaft is intact altho it doesn't turn easily...is this normal?.....I do not see a key....would it be close to the nut connection on the end of the shaft?

thanx

 

[chriswheeler]

Now that you have the pump off, might as well have a look inside, check condition. Couple of times right after I got my Yanmar, had this happen. Always ended up being a cloged filter in my case. After draining the fluid, open the little triangular plate with three screws and check to see if the filter is clean. First couple of years, even with frequent oil changes, filter got clogged. Inside of the case had to be real dirty on mine, think with frequent oil changes and filter cleaning, most is cleaned out. If you need a pump, Hoye has them at a reasonable price. Good luck.
Chris

 

[clemsonfor]

UHH. I thought you had already pulled the filter/screen. If you had not drained fluid and pulled it out and checked it you need to do that first. I would not put the pump back on till you pull the plate and see the filter. If the filter looks clean and good then dig into the pump.

 

[winston1]

I pulled the pump....shaft is intact altho it doesn't turn easily...is this normal?.....I do not see a key....would it be close to the nut connection on the end of the shaft?

thanx

The key is under that nut connection. Yanmar Tractor Parts: HYDRAULIC PUMP The pump should not be hard to turn. Pump shaft with key. Yanmar Tractor Parts: PUMP ASSY