Case 1845 hydraulic issues?

[Skerian]

Hello I have an 1845 Case (Not C or B model) that we are assuming has a major hydraulic issue, but are completely stumped.
To explain what happened we were dumping a bucket of dirt. After turning around we were driving forward and dropping the bucket when suddenly we lost boom and driving forward/reverse power. Motor was still running. Before the sudden stop there was no loss of power or whining in the pumps.
We have pulled the tandem pumps finding no issues all shafts are clean and move properly. We turned the motor that runs the u-joint to the tandem pumps which appears to be good.
When we drained the hydraulic oil it was holding approximately 10 Gallons.
Their is no cuts in hydraulic hoses, but had one small leak in a return line
We have 1 broken wire that appears to run to the hydraulic filter? Would that shut down the hydraulics?
What else should I look at that would cause sudden failure?

 

[[email protected]]

Hello I have an 1845 Case (Not C or B model) that we are assuming has a major hydraulic issue, but are completely stumped.
To explain what happened we were dumping a bucket of dirt. After turning around we were driving forward and dropping the bucket when suddenly we lost boom and driving forward/reverse power. Motor was still running. Before the sudden stop there was no loss of power or whining in the pumps.
We have pulled the tandem pumps finding no issues all shafts are clean and move properly. We turned the motor that runs the u-joint to the tandem pumps which appears to be good.
When we drained the hydraulic oil it was holding approximately 10 Gallons.
Their is no cuts in hydraulic hoses, but had one small leak in a return line
We have 1 broken wire that appears to run to the hydraulic filter? Would that shut down the hydraulics?
What else should I look at that would cause sudden failure?

I am not sure if you tested the tilt of the bucket and if so does that not work? You said the drive stopped and that took place when lowering the bucket and lost all the hydraulics. So lets do this, what is the main drive pump location and what drives it? A belt? Coupler off the engine? I have seen the couplers on some strip off the splines. If that is the case on this unit remove that pump and check the coupler and the splines that attach it.. That"s one test. If the pump is belt driven how's the belt? Tight or sloppy? Check the cables that engage the hydraulic valve banks. Starting at what seemed to be a quick drop of hydraulics maybe where to look first. Or was it sluggish for some time? How about a System relief stuck open? Just some ideas.

 

[Skerian]

I am not sure if you tested the tilt of the bucket and if so does that not work? You said the drive stopped and that took place when lowering the bucket and lost all the hydraulics. So let's do this, what is the main drive pump location and what drives it? A belt? Coupler off the engine? I have seen the couplers on some strip off the splines. If that is the case on this unit remove that pump and check the coupler and the splines that attach it.. That"s one test. If the pump is belt driven how's the belt? Tight or sloppy? Check the cables that engage the hydraulic valve banks. Starting at what seemed to be a quick drop of hydraulics maybe where to look first. Or was it sluggish for some time? How about a System relief stuck open? Just some ideas.

Tilt of bucket does not work, no up and down on bucket, & no forward or reverse. Main drive pump is removed already and splines are good and couplers are good in between each pump.

Belt that drives that pump is in good condition and tight. The U-joint and shaft that runs to the "tandum pumps" is good.

I'm not finding any reliefs stuck open, but will check the cables.

Skid loader was not sluggish at all when it quit working.

I've attached some pictures of the u-joint that runs to the pumps, and the 3 pumps that have been all checked over.

 

[billyb]

I am not sure if you tested the tilt of the bucket and if so does that not work? You said the drive stopped and that took place when lowering the bucket and lost all the hydraulics. So lets do this, what is the main drive pump location and what drives it? A belt? Coupler off the engine? I have seen the couplers on some strip off the splines. If that is the case on this unit remove that pump and check the coupler and the splines that attach it.. That"s one test. If the pump is belt driven how's the belt? Tight or sloppy? Check the cables that engage the hydraulic valve banks. Starting at what seemed to be a quick drop of hydraulics maybe where to look first. Or was it sluggish for some time? How about a System relief stuck open? Just some ideas.

Main hydraulic pump runs of of the fan end of the engine. Driven off engine crankshaft. See it when you open back door. It provides the oil for the hydrostatic drives under the seat as well as the loader functions. It has a splined coupler between it and the engine. Worn coupler and/or pump splines is a common problem on these older machines

 

[[email protected]]

Tilt of bucket does not work, no up and down on bucket, & no forward or reverse. Main drive pump is removed already and splines are good and couplers are good in between each pump.

Belt that drives that pump is in good condition and tight. The U-joint and shaft that runs to the "tandum pumps" is good.

I'm not finding any reliefs stuck open, but will check the cables.

Skid loader was not sluggish at all when it quit working.

I've attached some pictures of the u-joint that runs to the pumps, and the 3 pumps that have been all checked over.

You say the pumps are all checked over. Flow wise ? It there by chance a diverter valve for other tools on this machine? Stuck open? If the main pressure system relief is stuck open or gave up nothing will work. The cables if broken could be another problem since you have gone through it that leaves internal pump issues. The splines are good you said. Even inside the of the hub it slides into? On the older bucket trucks there was what was called a dead man valve. Designed to dump all pressures incase of an injury etc. It's a system pressure dump valve. Or sometimes used to divert the flow to an auxilary too. not sure what you have there. Just some thoughts to review and ideas may flow. Good Luck Post any results if you can it may help others later.

 

[Skerian]

You say the pumps are all checked over. Flow wise ? It there by chance a diverter valve for other tools on this machine? Stuck open? If the main pressure system relief is stuck open or gave up nothing will work. The cables if broken could be another problem since you have gone through it that leaves internal pump issues. The splines are good you said. Even inside the of the hub it slides into? On the older bucket trucks there was what was called a dead man valve. Designed to dump all pressures incase of an injury etc. It's a system pressure dump valve. Or sometimes used to divert the flow to an auxilary too. not sure what you have there. Just some thoughts to review and ideas may flow. Good Luck Post any results if you can it may help others later.

We have found the problem after we had dug through the whole machine and could not find the slightest imperfections on exterior of pumps/drive. Today we decided to split all 3 pumps. The shaft interior completely snapped. Keep in mind when we moved the pump from the outside it was not slipping or catching. New pump is ordered through all state ag. Thanks for the help.

 

[vince1845]

We have found the problem after we had dug through the whole machine and could not find the slightest imperfections on exterior of pumps/drive. Today we decided to split all 3 pumps. The shaft interior completely snapped. Keep in mind when we moved the pump from the outside it was not slipping or catching. New pump is ordered through all state ag. Thanks for the help.

Would you be interested in selling the old pump for parts?