YM1700 hydraulic problem

[bigdawggreaser]

I have a YM1700. The Hydraulic lines hung down and hooked on a stump and pulled loose at the quick connect. Now none of the hydraulics work. the bucket will not lift and the 3ph will not lift or lower. I don't seem to be getting any pressure from the pump. any suggestions where to look?

 

[ym2610]

you didn't say so I'm guessing you didn't loose any fluid, but could air have got in some way, just wondering.

 

[mark777]

Does the pump whine or make any noise? I'm thinking a pressure line is badly kinked somewhere.

Mark

 

[DavesTractor]

When the lines disconnected at the QD, the QD shut off the flow from the pump and the flow had no where to go. The pressure relief is downstream from the loader. The pump should have blown to bits, but to protect from such a violent expolsion, most pumps have a "fuse" of sorts, either a key in a keyway, or sometimes a groove machined in the shaft (newer "F" series) The pump likely either sheared the shaft or the key in the keyway if so equipped. It is very possible that the pump is damaged, but if the key sheared immediately it may have protected the pump. I'm not sure of the design on that pump, but others will know.

Sorry for the bad news, but welcome to TBN where someone always seems to know the answer and be able to provide a solution

 

[1danny]

There is a 3m x 13m shear key on the pump shaft.

Danny

 

[bigdawggreaser]

Thanks Daves tractor! You were absolutely correct. After checking the screen, we decided to pull the pump to see if there was a problem there (when in doubt disassemble is my moto). The key was sheared smooth. Thanks everyone.

 

[Eddie]

That's good information to know since I have a ym1700 with quick disconnects on the FEL. I learned something as I have so many times on this forum.

 

[Mickey_Fx]

Anyone ever give thought to adding a bypass line with a pressure relief valve? Have the valve set so it would open up in the event a QD poped off causing excessive load on the pump. The likely hardest thing is to find the valve with the correct pressure.

 

[DavesTractor]

Mickey,

Good idea, but it does require some hardware and some additional plumbing. Sometimes it isn't so easy to find a good "tank" location to dump the bypass either.

Most people hardly ever remove their loader, so an easy and practical solution is to remove the QD's and just connect the hoses. If a hose gets ripped off, it will squirt oil, but it won't damage the pump. If you do remove the loader every couple of years, just unscrew the hoses.

 

[Soundguy]

I've seen ( on heavy equipment ) a relief plumbed right after the pump, with a short hose just pointing out/up... if a qd broke.. relif would dump/spray oil in a fountain and not deadhead the pump.. easy to see.

Seen this on big pull pan setups with 2 pans behind a big tractor...

wastefull and not ideal.. but then.. some of the pumps on those big machines are a couple thousand dollars to rebuild
and 6k to 7k$ to repalce...

Soundguy