How to flush hydraulic system on a TC24DA?

   / How to flush hydraulic system on a TC24DA? #1  

chanceu

Silver Member
Joined
Aug 19, 2005
Messages
120
Location
Alpharetta, GA
Tractor
New Holland TC24DA
A little background...I have a year old TC24DA with 64 hours. I've been having issues with my FEL (NH 12LA) curl and lift leaking down while the tractor is running at PTO speed. The lift slowly leaks down, but the curl is inconsistent. Sometimes the curl stays in place for a long time or slowly goes gown, but other times it'll almost hit the ground in the time it takes to turn my head to back up. When I say leaking down, I'm don't mean the FEL settles a little, I mean it will hit the ground if I let it go.

The dealer suggested it might be a seal in one of the cylinders and said that if I dead head the system for a few minutes, the bad cylinder will get hot. I did this for both lift and curl and none of the cylinders seemed to get any warmer than the others.

Someone here suggested the backflow poppits in the control valve might be bad. Since they were inexpensive, I gave it a shot and replaced both of them. The problem seemed to go away for a month or more then came back.

There are no leaks I can see and the FEL seems to work fine and be as strong as it always was, it just won't stay up. As a last ditch effort before I take it to the dealer, I have been thinking about flushing the hydraulic system. I figure it's a fairly inexpensive DIY project and if it works, it'll save me the time and money of a dealer visit.

The point of this post...I have read several posts about flushing the hyraulic system, but none specifically for NH. They suggest draining the hydraulic oil, refilling with kerosene or diesel, running the system for a few minutes, drain the kerosene or diesel, and refil will hydraulic oil. My question is can this be done to my TC24DA without hurting it? The other posts were about other tractors, some were older and some were brands I'd never heard of.
 
   / How to flush hydraulic system on a TC24DA? #2  
Personally I wouldn't put anything but hydraulic oil in the system.

Did you change out the hydraulic & HST filters at 50 hours? If not, I'd drain the system & replace those filters. Maybe there is some crud gumming up the works. If a fluid & filter change doesn't solve it, send it back while it is under warranty.

I'm assuming you have already disconnected & reconnected the FEL quick connections to ensure they are properly "seated" for lack of better term.

Are you seeing any oil leaks?
 
   / How to flush hydraulic system on a TC24DA? #3  
You have either a cylinder issue which I doubt if both lift and curl are failing or you have an issue with the spool valve. I vote for the spool valve. It's not surprising that replacing the load checks did nothing as their function is to monentarily keep the loader from dropping due to gravity when pressure is initially applied. Once pressure builds up they no longer function. This prevents jerking.

Your valve could have unacceptable machined tolerances, poor seals or any number of inherent problems. Let the dealer worry about it.

As for flushing the hydraulic system with anything other than hydraulic fluid, I would not since you have an HST. Besides it won't fix your problem and may do more damage that help.
 
   / How to flush hydraulic system on a TC24DA? #4  
I with MadRef on this one, I vote for a defective valve.
 
   / How to flush hydraulic system on a TC24DA?
  • Thread Starter
#5  
The reason I was trying to avoid the dealer is for whatever reason, I thought the warranty was only for 12 months and I bought it 8/24/2005. I just called and found out that the full vehicle warranty is for 24 months, so I will take it to the dealer.

Thanks
 

Tractor & Equipment Auctions

3- point Row Crop Cultivator (A35780)
3- point Row Crop...
Kubota X1100C RTV (A36337)
Kubota X1100C RTV...
2014 Atlas Copco XAS-300-JDU7 Air Compressor (A36337)
2014 Atlas Copco...
2008 Utility VS-2RA Refrigerated Van Trailer, (A35430)
2008 Utility...
Yamaha Electric Golf Cart W/Charger (A36602)
Yamaha Electric...
John Deere RM Row Crop Cultivator (A36337)
John Deere RM Row...
 
Top