NH 16LA loader on a TC45DA

[Sigogglin]

I was using my loader yesterday and noticed that if I let it sit for 15 minutes the bucket slowly uncurls and dumps everything on the ground.

I'm used to a bit of a droop with loaders, but this is pretty extreme. I did find one hose on the loader hydraulic that was lose so I tightened it, but it made no difference. What else can I look at to figure out why it droops so quickly.


thanks
david

 

[RickB]

Bucket cylinder seal kits.

 

[Sigogglin]

I've never rebuilt a cylinder, but it looks do able. Question for someone that has, is the rod seal installing tool required? It looks like getting that one seal in could be a hassle.

thanks

 

[RNeumann]

Drift sounds more like the valve. Undo the QCs between the loader and tractor and see if it drifts. If you don’t have QCs cap the hoses and see if it drifts.
If it’s a cylinder seal- where is the fluid going?

 

[RickB]

Drift sounds more like the valve. Undo the QCs between the loader and tractor and see if it drifts. If you don’t have QCs cap the hoses and see if it drifts.
If it’s a cylinder seal- where is the fluid going?

To the other side of the piston. Piston seals fail far more often than valves.

 

[RNeumann]

To the other side of the piston. Piston seals fail far more often than valves.

Interesting theory. Unfortunately both sides of the piston don’t have the same amount of fluid/volume. Therefore the fluid can’t simply move from one sided the piston to the other...... supposedly!

Here is a cylinder rebuild video. He says at the end it’s “typically” the cylinder. I guess I’d like to diagnose more than others- before I just throw parts at it.

Oops I forgot the like-

How to Repair a Hydraulic Cylinder - YouTube

 

[Sigogglin]

I can disconnect the hydraulic line quick disconnect. Then remove the line from one port and let it sit. This should allow air to be sucked into the cylinder, if there is a leak and it will drop. To speed it up I guess I could use my compressor to pressurize it.

At least I think this will work,

Basically a modified version of this:

Bypass testing a hydraulic cylinder - YouTube

david

 

[Sigogglin]

OK I did a quick test.

I lifted the bucket and made it level. I then disconnected both of the curl hydraulic quick disconnects and let it sit. It has now dropped 90 degrees. There is no leaking hydraulic fluid out the quick disconnected or anywhere I could see.

So I've read that this doesn't happen because there is no where for the fluid to go. So why did my bucket drop?

thanks,
david

 

[RNeumann]

Does this help?

Hydraulic cylinder fluid internally bypassing - YouTube

 

[Sigogglin]

Does this help?

Hydraulic cylinder fluid internally bypassing - YouTube

that makes sense, when you pull it out from a retracted position you just create a bit of vacuum. So it makes me think that my cylinders need rebuilt, regardless if there is an issue with the valve. Otherwise how would it ever hold position?

thanks