NH 16LA loader on a TC45DA

[K5lwq]

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]

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]

Interesting theory. Unfortunately both sides of the piston don稚 have the same amount of fluid/volume. Therefore the fluid can稚 simply move from one sided the piston to the other...... supposedly!

Here is a cylinder rebuild video. He says at the end it痴 �ypically the cylinder. I guess I壇 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]

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