1845C Hydraulics Issue

[Delmer]

On my Case 1845C, as I begin lifting a heavy load, my lift arms will actually begin to drop. If I increase the rate at which I lift it will stop descending and lift as it should. Any ideas on what is causing this? Any photos or parts diagrams? Thanks, Delmer

 

[Tazza]

Could be the load checks in the control block or as simple as bad seals inside the ram. If the piston seals are leaking, oil will flow past and the arms will lower, if you start to lift, the extra oil will push against the piston more than it's leaking making it lift as it should.

 

[Delmer]

Could be the load checks in the control block or as simple as bad seals inside the ram. If the piston seals are leaking, oil will flow past and the arms will lower, if you start to lift, the extra oil will push against the piston more than it's leaking making it lift as it should.

Thanks Tazza, I'll explore the control block possibility. I most definitely could be wrong, but it doesn't seem like it could be a piston seal. The loader stays up fine if nothing is done with the controls. It's only when I try to inch up a little higher that it will drop - till I move the lever even further and lift faster. Kinda hairy when trying to precisely place heavy objects.

 

[Yoda]

Thanks Tazza, I'll explore the control block possibility. I most definitely could be wrong, but it doesn't seem like it could be a piston seal. The loader stays up fine if nothing is done with the controls. It's only when I try to inch up a little higher that it will drop - till I move the lever even further and lift faster. Kinda hairy when trying to precisely place heavy objects.

I will be following this thread closely. my 1845c does the exact same thing

 

[SethA]

Tazza is right on the load checks, They are plugs on the loader valve that hold it until the oil builds up enough to lift, after supporting the loader (very important when working with hydraulics) you can take those plugs out and you will see a spring and a valve. What happens is that valve starts to wear into the plug/cap and creates a little ridge to it hangs up on there. The easiest way to fix it is to use emery cloth, or a sander attachment on a die grinder and smooth the inside of that cap/plug so there isn't a lip or ridge for the valve to hang up on

 

[Yoda]

Tazza is right on the load checks, They are plugs on the loader valve that hold it until the oil builds up enough to lift, after supporting the loader (very important when working with hydraulics) you can take those plugs out and you will see a spring and a valve. What happens is that valve starts to wear into the plug/cap and creates a little ridge to it hangs up on there. The easiest way to fix it is to use emery cloth, or a sander attachment on a die grinder and smooth the inside of that cap/plug so there isn't a lip or ridge for the valve to hang up on

Seth, which is the plug cap you are referring to?http://www.colemanequip.com/CASE/Images/1845C/CASE-1845C-Hydraulics-JAF0122751-nFYt-normal.gif

 

[SethA]

Seth, which is the plug cap you are referring to?http://www.colemanequip.com/CASE/Images/1845C/CASE-1845C-Hydraulics-JAF0122751-nFYt-normal.gif

http://caseconstruction.dminteractive.com/s/115122/39139/419891/ they're reference 12 in this picture

 

[Yoda]

http://caseconstruction.dminteractive.com/s/115122/39139/419891/ they're reference 12 in this picture

Thanks Seth

 

[Delmer]

Tazza is right on the load checks, They are plugs on the loader valve that hold it until the oil builds up enough to lift, after supporting the loader (very important when working with hydraulics) you can take those plugs out and you will see a spring and a valve. What happens is that valve starts to wear into the plug/cap and creates a little ridge to it hangs up on there. The easiest way to fix it is to use emery cloth, or a sander attachment on a die grinder and smooth the inside of that cap/plug so there isn't a lip or ridge for the valve to hang up on

I took the loader control apart and pulled the valve rods. In my case they were in perfect condition, I couldn't see any ridge or wear. Any other thoughts?

 

[Delmer]

Bump

 

[Tazza]

Bump

The only other thing i can think of is the relief valve in that segment of the control block. If it's by-passing, it could allow the load to drop?

 

[Delmer]

The only other thing i can think of is the relief valve in that segment of the control block. If it's by-passing, it could allow the load to drop?

I finally got it! Minus the time, the cost was around $6 for a couple springs from the hardware store. On the advice of someone who had a similar issue I pulled the load checks from the valve body - the springs in them were compressed and broken. On my machine these are the two 7/8" plugs on the top of the valve body, in amongst the hydraulic line fittings. I did have to remove a few of the lines to get a socket on the valve heads, and I had to grind down an old socket to where the wall was thin enough to fit. Here's a link to where I uploaded a few images: http://www.heavyequipmentforums.com/threads/case-1845c-hydraulic-issue.68296/

 

[Delmer]

I finally got it! Minus the time, the cost was around $6 for a couple springs from the hardware store. On the advice of someone who had a similar issue I pulled the load checks from the valve body - the springs in them were compressed and broken. On my machine these are the two 7/8" plugs on the top of the valve body, in amongst the hydraulic line fittings. I did have to remove a few of the lines to get a socket on the valve heads, and I had to grind down an old socket to where the wall was thin enough to fit. Here's a link to where I uploaded a few images: http://www.heavyequipmentforums.com/threads/case-1845c-hydraulic-issue.68296/

Tazza, you had identified it in your first response, I just didn't know enough for what to look for specifically.

 

[Tazza]

Tazza, you had identified it in your first response, I just didn't know enough for what to look for specifically.

Glad you worked it out. Shame it was such a pain to work out, but at least it's sorted out now.