Loader Hydraulic issues, No back Pressure after the Loader controls?

[scooter133]

Okay, here is more info.

Still have jerky minimal control for a few moments after start up.
What I've taken apart/seen.
Intake Screen - cleaned
Pump seems to be able to build pressure, cant seem to sustain it.

Took apart the relief valve to the parts shown- Spring and valve pin. Valve pin had slightly burred edge. used ceramic edge to smooth.

Replaced all. Can get oil to flow from top of pressure relieve. Tighten back down and bucket performs the same jerky movements.

That one with the O-Ring seems to be where I'm headed next. Though I'm not sure?

 

[winston1]

You have two control levers for the 3 point lift. One that raises and lowers, the other is for draft control. Have you tried moving the draft control lever to different positions to see if it effects anything? I remember my old 2002d was effected in some way, just can't remember just how.

 

[careyo63]

Look inside the lines. Had the same thing pretty much happened on the Fords Wagner. NTM. so I was doing Maint. and changed the Hyd. fluid cleaned the filter etc.. Started it up and it did the same thing. Pulled it back down and checked the screen which is a Basket just before the pump which is driven off the Eng. Crank shaft so real easy to access. It was clean still and full of Fluid! thought that was odd that was Happening. Luck have it I happen to look inside the hyd. line itself and Wahla!! The hose swelled up inside at a bend and had the line almost pinched off. I Replaced the line actually shortened that section to prevent it happening again and has been working ASIS every since. You can see the small section just before the Strainer basket in the Pick. Barely see it on the L.side. Only a couple inches to were it use to be at least 6 inches easy. Replaced and cleaned both pump lines and it's been trouble free!

Attachments

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  pump.JPG

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[scooter133]

I was able to remove the bucket controls from the line. So it’s just the screen, filter, Pump QuickConnect, then back into Hydraulic control valve.

3Pt was still wacky.

Pressure gauge shows not even 500PSI when put inline.
Pressure gauge pegged passed 3000 when I cranked the engine (no gas).

Took apart the Hydraulic controller. The O-Ring on the cylinder in there has some rough spots. Looking for the replacement O-Ring.

Took quite a bit to get the Cylinder out of there. Most of the videos I watched it just slides out. I need to Add compressed Air to push it out. I was stuck or so it seemed?

 

[scooter133]

Look inside the lines. Had the same thing pretty much happened on the Fords Wagner. NTM. so I was doing Maint. and changed the Hyd. fluid cleaned the filter etc.. Started it up and it did the same thing. Pulled it back down and checked the screen which is a Basket just before the pump which is driven off the Eng. Crank shaft so real easy to access. It was clean still and full of Fluid! thought that was odd that was Happening. Luck have it I happen to look inside the hyd. line itself and Wahla!! The hose swelled up inside at a bend and had the line almost pinched off. I Replaced the line actually shortened that section to prevent it happening again and has been working ASIS every since. You can see the small section just before the Strainer basket in the Pick. Barely see it on the L.side. Only a couple inches to were it use to be at least 6 inches easy. Replaced and cleaned both pump lines and it's been trouble free!

Attachments

• 
  pump.JPG

  2.1 MB · Views: 118

I’ll Check out the lines out, though I am getting flow to the Hydraulic valve Controller, It gushed out of the input there when I loosened the connectors.

 

[careyo63]

I’ll Check out the lines out, though I am getting flow to the Hydraulic valve Controller, It gushed out of the input there when I loosened the connectors.

Pumps work or they don't pretty much. The pump is working so you have a problem with the amount of Hyd. fluid being pumped. Just because you have pressure the problem is not enough fluid. Suction side to the Hyd. pump is my guess. Why I'm saying this is I worked for a swimming pool store and That is very common for that to happen. I did the repair work also! Commercial and Residential pools!! I knew to pull mine back down and start to look for a problem, The Bio lab plant in Ga. on fire. I know it well. Local....Chlorine!

 

[ponytug]

I was able to remove the bucket controls from the line. So it’s just the screen, filter, Pump QuickConnect, then back into Hydraulic control valve.

3Pt was still wacky.

Pressure gauge shows not even 500PSI when put inline.
Pressure gauge pegged passed 3000 when I cranked the engine (no gas).

Took apart the Hydraulic controller. The O-Ring on the cylinder in there has some rough spots. Looking for the replacement O-Ring.

Took quite a bit to get the Cylinder out of there. Most of the videos I watched it just slides out. I need to Add compressed Air to push it out. I was stuck or so it seemed?

Yes, that o-ring looks bad to me, both in this photo and the slightly out of focus one before. However, I would look inside to see if there is rust or scars or scratches that could have caused the nicks/wear in the o-ring. It would be great to find the cause of the wear on the o-ring. If you don't, I think that you run the risk of this repeating itself.

I would not rule out the thought that part of your issues is water in the hydraulic oil, causing a clogged suction screen.

The nicked o-ring might explain the "glitches", but it probably doesn't entirely explain the low pressure.

Good luck!

All the best,

Peter

 

[winston1]

Not understanding the 3000psi when cranking the engine. You are not going to have much pressure unless your lift is requiring it. (big load). On the 20002 you can slowly close down on the stop valve and watch your pressure gauge. The 2002d has a relief valve built in the 3 point control and it will or should relieve a little over 2200psi. I wouldn't necessarily recommending making it relieve, just close the valve enough to watch the pressure rise. If it doesn't rise then there is something rotten in Denmark.

 

[careyo63]

Rice patty water trashed my Org. cylinder screen, Had to replace it. Looked as though Someone Copper welded a new screen. So it had problems a couple times! The weld was pitiful and the screen showed signs of damage on that one, The Hyd Pan had 1 inch of Crisco thick dirty Hyd. fluid on the bottom. Super Nasty!! And Stank!! Rice Patty water no doubt! And my guess Whale oil. Common Hyd. fluid back then! be careful you don't Shear the Hyd. shaft key if you close that Valve I highly don't recommend doing that!