Case 1845 b

[pinto Bill]

I have a 1845 b skid steer and it will not hold the curl the lift arms work perfectly and will hold no problem. Could it be the control valve is bad any help will be appreciated thank you.

 

[brdgbldr]

I have a 1845 b skid steer and it will not hold the curl the lift arms work perfectly and will hold no problem. Could it be the control valve is bad any help will be appreciated thank you.

Could be the tilt cylinders need to be resealed. Could also be the tilt control valve or pressure relief valve.

 

[pinto Bill]

Thank you I will try that the right till cylinder is leaking hydraulic fluid

 

[Gearclash]

How fast is the bucket sagging? Some sag is inevitable, especially on the first part of the cylinder travel where the bucket has great leverage on the cylinder. If the cylinders are sagging rapidly, force the arms all the way down, then take the bucket and lift the front wheels of the machine off the ground at least half a foot. See if the bucket cylinders sag in retraction almost as bad they as they sag in extension. If the cylinders sag significantly in retraction, there is leakage in the control valve/load check valve. If the cylinder sag badly in extension but not in retraction, there is cylinder piston seal blown.

 

[pinto Bill]

Thank you so very much. I will try this next week and pray it's not the control valve.it's so hard to find parts for this machine. And I really would like to save it.

 

[pinto Bill]

Thank you so very much. I will try this next week and pray it's not the control valve.it's so hard to find parts for this machine. And I really would like to save it.

Well I had time off today and I tried it and raised the skit steer up with the bucket and yes! It will go down at the same speed as when you curl the bucket up. Now I will have to find out where is the check valve location. But if it's not the check valve then it's the control valve. Thank you again Mr. Gearclash

 

[Dougushka]

Thank you I will try that the right till cylinder is leaking hydraulic fluid

A dual cylinder machine is easy enough to test for internal cylinder bypass. All you need is a pair of JIC (or face-seal on newer machines) caps & plugs. After first positioning the machine so as to lose a minimum amount of oil, disconnects the lines on one cylinder. Plug off both lines and cap both adapter fittings on the cylinder. Then start the machine and try to cycle the bucket with just the one cylinder. If the seals are good in the disconnected cylinder the active cylinder will not be able to force it to bypass. If it does move, then that cylinder is bypassing and needs to be re-sealed. And the other cylinder might be bypassing also, so you should test them both.

 

[Gearclash]

A dual cylinder machine is easy enough to test for internal cylinder bypass. All you need is a pair of JIC (or face-seal on newer machines) caps & plugs. After first positioning the machine so as to lose a minimum amount of oil, disconnects the lines on one cylinder. Plug off both lines and cap both adapter fittings on the cylinder. Then start the machine and try to cycle the bucket with just the one cylinder. If the seals are good in the disconnected cylinder the active cylinder will not be able to force it to bypass. If it does move, then that cylinder is bypassing and needs to be re-sealed. And the other cylinder might be bypassing also, so you should test them both.

Don't, under any circumstances, try this test without a really stout attachment firmly coupled to the machine or you with twist the $h!t out of the coupler. Even then its not a great test as you will not make the bad cylinder retract, even if the piston seals were completely gone.

 

[Dougushka]

IF the rod seal is leaking, as we already know it is in this case, then YES, you will be able to make the bad cylinder retract, and that extra oil is not going back through the valve, it is instead going on the ground.

 

[Gearclash]

You are correct, I should have noted that the capped off cylinder cannot be forced to retract unless the oil in the cylinder can leak out of the head seal.

 

[Dougushka]

IF the rod seal is leaking, as we already know it is in this case, then YES, you will be able to make the bad cylinder retract, and that extra oil is not going back through the valve, it is instead going on the ground.

You are correct, I should have noted that the capped off cylinder cannot be forced to retract unless the oil in the cylinder can leak out of the head seal.

With more than one component in a system I always try to isolate the suspect component for testing. No one wants to replace a cylinder only to discover the actual problem was the control valve, or vice-versa. It happens more often than one would think.
Your concerns about using one cylinder to "test" the other are both valid. If we're testing on retraction obviously the extra oil has to go somewhere. Better to test on extension. And if both cylinders are actually good, and we hog into it with throttle up (no need for that!) possible could tweak the coupler frame. A skid-steer coupler frame is certainly way less stout than a traditional front-end loader frame.
Maybe the better approach (which eliminates those two concerns) is the good old bucket and a hose. This method also works when you have just one cylinder instead of two.
Stroke out the cylinder in question . Block, support, & secure so gravity can't move anything. Remove the line at stroked out end and plug it off. Attach a temp hose to the cylinder to drain into a bucket. Start the machine and engage to the same direction as the cylinder is already at. The cylinder can not move because it's already stroked out. IF it is bypassing, oil will flow into the bucket. If there is no oil going into the bucket, the cylinder is not bypassing. Then put it all back together and stroke it the other direction and re-test. The cylinder is good only if there is no oil flow at either end. And if we are dealing with two cylinders, obviously we need to test them both. ONLY then, when I have confirmed with 100% certainty that the cylinders are not bypassing, would I then go after the control valve.