NH 16LA loader on a TC45DA

Sigogglin · Nov 4, 2018

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 · Nov 5, 2018

Bucket cylinder seal kits.

Sigogglin · Nov 5, 2018

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 · Nov 5, 2018

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 · Nov 5, 2018

RNeumann said:
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 · Nov 5, 2018

RickB said:
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 · Nov 5, 2018

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 · Nov 5, 2018

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 · Nov 5, 2018

Does this help?

Hydraulic cylinder fluid internally bypassing - YouTube

Sigogglin · Nov 5, 2018

RNeumann said:
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

K5lwq · Nov 5, 2018

RNeumann said:
Does this help?

Hydraulic cylinder fluid internally bypassing - YouTube

What a great demonstration! Thanks for sharing as this should clear up a lot of confusion.

RNeumann · Nov 5, 2018

Sigogglin said:
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

That’s what I’m guessing. Obviously a lot of wear since both are shot.

I reread my first post and that may have created the confusion. For that I apologize. My thought was a systematic diagnosis before you order parts and or break into something. But it didn’t come across that way.......

RickB · Nov 5, 2018

RNeumann said:
Interesting theory. Unfortunately both sides of the piston donç¨š have the same amount of fluid/volume. Therefore the fluid canç¨š simply move from one sided the piston to the other...... supposedly!

Here is a cylinder rebuild video. He says at the end itç—´ é��ypically the cylinder. I guess Iå£‡ 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

As you can see, it is a fair bit more than theory. 24 years of dealership experience I cannot tell you how many times this has come up and far, far more often than not the cause is in the cylinder. Valves are metal on metal, cylinders have soft parts that fail easier. Valve replacement is a rare repair, seal kits are often in stock at the dealer level. That is because they sell. Accurate troubleshooting is always prudent and always part of my recommendation.

Sigogglin · Nov 21, 2018

Update:

I got the replacement seal kits and got around to doing it today.

Both of the nuts on the rods were loose, like basically finger tight (maybe not that loose, but easily turned with a crescent wrench). I went ahead and replaced the seals, hit the big nut with the impact until it would no longer turn. Verified it was actually tight with a hand wrench and put it all back together.

Works wonderfully, no drooping bucket for me. Was quite easy, took maybe 2 hours? 1.5 for the first one and .5 for the second.

david

NH 16LA loader on a TC45DA

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