2 mechanical ? K B7800

[moship]

Logan97,

Perhaps consider this as a test to rule out or confirm the curl cylinders are the root cause.

Swap the hoses between the lift and curl at the joy stick controller. I致e included a picture from my tractor which may have a different color code than yours. The idea would be the same.

After swapping the hoses around, start the tractor and lift the bucket similar to what you have done in the past when the bucket would uncurl. What does it do now?

If the bucket height drops and the curl holds; The curl cylinders are good and there must be something else causing the fluid to bleed from the cylinder. Perhaps it is in the controller.

If the bucket height maintains and the curl still doesn稚 hold there is something definitely going on with the cylinders.

Note:
1) Before swapping the hoses around make certain the tractor is off and move the joy stick through all positions to bleed off any residual pressure.
2) After swapping the hoses around the loader will work opposite of what you are use to, so be careful. Lift will curl and curl will lift.
3) The color code on my tractor may be different and the hoses shown in the photo are from my snow blower. White and Yellow raise/lower and Blue and Red control the curl.
4) Do not forget to swap the hoses back after the test.

wdchyd posted very similar comments as to what I sent in a private message. Either the cylinder was not the problem in the first place, they did a sloppy job with the repair or they never did the packing replacement.

 

[logan97]

tops to bottoms or sides to sides ??

 

[logan97]

New Development. I had to leave for a moment this morning, (visitors) so I could not keep an eye on the mechanics visit. On my return before he left I noticed a large spot on the ground under one of the cylinders and a smaller under the other.He evidently looked at the cylinders in my absence, as he stated they were worn. I specifically asked if he checked the hydro fluid level, he replied yes it is OK,just fine.Few minutes ago I went to transfer some firewood thought I would check the hydro level before starting the engine,Bucket and Box Blade in the down position engine off.No fluid shows on the stick Kubota UDT hydro fluid correct,fill plug behind the seat,fluid level check down right of seat. Should the engine be on or off when checking ?

 

[logan97]

Update. Dealer reimbursed parts (seal kit) and 1 hr labor. Does 1hr sound correct to replace / repack cylinder seals ?

 

[wdchyd]

Yep, that's pretty much it.......1 hr each if no trouble/newer cyl.......1-2 if old/rusty or beat ect.......

Sounds about right....

 

[nike]

I read somewhere ( I wish I could remember where) that the controls were the cause of hydraulic creep. I think I would have them checked first. One bad cyclinder after 275 hours,ok, but both?????:2cents:

 

[wdchyd]

I read somewhere ( I wish I could remember where) that the controls were the cause of hydraulic creep. I think I would have them checked first. One bad cyclinder after 275 hours,ok, but both?????:2cents:

Nike,

The control valve can be the source of "Creep Down", but the only way to absolutely be sure is to troubleshoot (swapping hoses/pressure guages ect)...

Cyl seals are a wear/tear item that take a lot of stess but do wear out more often than control valves.......if the control valve was worn then it's junk and can be more costly than repacking cyls.....

Usually cyls are the first thing to suspect but troubleshooting saves the agony of guesswork....never assume....

Also if only ONE of a pair of cyls are not holding a load, then both in that circuit will creep down at the same rate......