Hydraulics question

[NCScott]

Hi Guys,

I did a complete rebuild on my hydraulics last fall. Dropped it, cleaned everything, new type cylinder piston, replaced all the moving parts and pressure relief valve. It waorks fine, smooth and lifts fine, but it goes down overnight, isn't it supposed to stay where you leave it? any ideas on what might be wrong? Thanks for the help

Scott

 

[NCScott]

Sorry, forgot to add its an 8n front mount

 

[Bruce (VA)]

Wrong? Not that I can see!

I'd imagine some folks have a lift that can keep up a bush hog for days, but w/ about 7 likely leak sources (as I recall) it could be any one of them or a combination of two or three. You got the likely culprits, so I'd be happy w/ it.

I apply the 5 minute rule. If the disc or bush hog hits the ground in 5 minutes after the engine is off, it's time for me to work on it.
50 Tips

 

[ZANE]

It don't get much better than that!

Zane

 

[NCScott]

Thanks! I think I'll stop worrying about it!

 

[Dean]

Scott:

Most 9/2/8Ns will not hold a heavy load more than a few hours even with the NAA style piston and O ring.

There are exceptions. I recently finished rebuilding the lift and replacing the relief valve on a friends 49. I mounted a 550 lb. mower on the lift to test function and performance. It's been over a week now and the tailwheel is still about 10" from the floor.

I've also recently rebuilt the lifts on my 51 and 52 8Ns but but neither will hold the same mower completely off of the ground more than a day or two.

Dean

 

[Dell (WA)]

Scott.......ennythang over 30-mins is "braggin' time". I agree with Bruce's 5-min rule. .......Dell

 

[Popster MD]

Heh, I'd kill for a lift that would stay up for 5 minutes let alone overnight. Just finished spreading 10 truckloads of millings with a lift that hits the ground within 10 seconds! Have the parts, need to do the fix.

Your story gives me hope!

 

[HCooke]

According to the TV ads, if you got one that stays up overnite - call your doctor. Seriously, you should get in the habit of lowering the lift and implement to the ground every time you get off the tractor. Acts as an addtional brake and won't come down unexpectedly on a pet or kid.

 

[MeanGene1]

My '50 8N sat out back for 3 weeks, and the hitch was still up about halfway- of course this pampered puss has 1042 hrs on it, oil is clean...
Just bought a mower for it, but I almost hate to put the hours on it- but it is a tractor, and it's meant to work
It also started almost instantly after 3 weeks- completely stock 6V system

 

[Bruce (VA)]

".....if you got one that stays up overnite - call your doctor. "

Unless you're still in HS.

Like the old guy said, it now takes him all night to do what he used to do all night.

 

[Kenster]

(quoted from post at 19:22:57 04/01/10) Hi Guys,

I did a complete rebuild on my hydraulics last fall. Dropped it, cleaned everything, new type cylinder piston, replaced all the moving parts and pressure relief valve. It waorks fine, smooth and lifts fine, but it goes down overnight, isn't it supposed to stay where you leave it? any ideas on what might be wrong? Thanks for the help

Scott

Scott, where are you located? Has it been very warm there? What type of fluid did you use in the hydraulics?

If it's very warm where you live and you used 134-D fluid you may find that the fluid is too thin, which I believe will contribute to faster let down, and maybe leaks at seals, too. At least that's what I experienced here in hot, south central Texas. I got a lot better result when I switched back to 90 WT fluid.