Mother Deuce
Senior Member
This thread has been so helpful I was kind of wondering that myself
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Weird Hydraulic Issue cat 315CL
- Thread starter floridamechanic
- Start date
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- Tags
- hydraulic help
Nige
Senior Member
This is worse than waiting for the end of an Alfred Hitchcock movie .........
alaskaforby4
Senior Member
I test drove a 315b looking to buy and it would only lift the tracks 4" off the ground as you said and the only way it would go higher was with the boom down function.
I showed the owner and he tapped the display panel, (it was set up for priority to Aux. Power) he pushed the normal dig button and everything went to as it should be.
Just my experience. Best of luck
I showed the owner and he tapped the display panel, (it was set up for priority to Aux. Power) he pushed the normal dig button and everything went to as it should be.
Just my experience. Best of luck
floridamechanic
Well-Known Member
sorry guys, been juggling work an my excavator entertainment event, pulled relief next to tag on MCV, looked good and clean, went an got a tip cleaner an could not run it thru holes in relief tip, was 80% stopped up, could not even see the obstruction, see pic, put back together an presto boom down drops to zero, NC pressure is too high but was no shims in cap on relief, now has 850 lbs on this pump and 380 on other pump oil hot, still gotta get pressure down here pic
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floridamechanic
Well-Known Member
thanks alaskaforby4 will check
Nige
Senior Member
It sounds like you are possibly going to be in contamination issues for a while yet. Something is circulating in your hydraulic system that's for sure.
I suggest that you go back to my post #267 on Page 14 and follow the recommendations contained in it. It will give you proof positive whether your system is "cleaning up" as time passes, or whether you are still in problems.
I don't want to be the harbinger of doom here but how does anyone know that the pump you changed is the only thing in the whole of the hydraulic system that is taking a dump at the present time..? Only oil analysis could potentially confirm or deny that IMHO.
I suggest that you go back to my post #267 on Page 14 and follow the recommendations contained in it. It will give you proof positive whether your system is "cleaning up" as time passes, or whether you are still in problems.
I don't want to be the harbinger of doom here but how does anyone know that the pump you changed is the only thing in the whole of the hydraulic system that is taking a dump at the present time..? Only oil analysis could potentially confirm or deny that IMHO.
jonno634
Well-Known Member
As mentioned, i’d Put it to work if you think you’ve got it mostly done (and see if you can narrow down the quirks). I’d change and cut filters after 3 days and inspect, to make sure things are settling down,
John C.
Senior Member
Earlier Mobiletec showed a picture with instructions for adjusting minimum stroke on the pump and it showed adding or removing shims to adjust that. Please note that the opposite side of that combination of spools there is an adjustment screw with a lock nut. This is similar to what is on a 330C excavator and NC pressure can be adjusted there. Turning the screw in decreases NC pressure on those machines. I don't know if that has a slotted screw or an allen head. In either case put a mark somewhere for a reference point and then turn the screw in a full turn and see if pressure on the gauge changes. If it does, bring the pressure even with the other pump and then try out your functions.
funwithfuel
Senior Member
So glad you found something. Not to pile on, but yeah, moving forward those little gremlins may reveal themselves here and there for a bit to come. Hope its minimal and GOOD JOB!
funwithfuel
Senior Member
Vetech will be disappointed, we only made 24 pages, nowhere near 61.
Mobiltech
Senior Member
Negative flow control pressure is created during the following machine operating conditions.
- All of the joysticks and travel levers/pedals are in the NEUTRAL position.
- Any of the joysticks and/or travel levers/pedals are partially moved from the NEUTRAL position in order to perform a fine control operation.
- A boom lower operation is performed alone.
I’m disappointed in all of you. LOLVetech will be disappointed, we only made 24 pages, nowhere near 61.
floridamechanic
Well-Known Member
Hey mobiltech, go down slow it does not stay at zero, comes back up, but drops quick if you open flow, has not done this, it matches other functions is kinda way to say it, really do not have a lot of ''boom down'' room on boom ground gets in the way real quick, know that cleaning debris made it drop 6 to 800 lbs,
floridamechanic
Well-Known Member
Tomorrow I get off dozer an outta swamp gonna hook gauges back up an get warm see NC pressures and then swap NC lines at MCV and see if pressures move with lines or stay like they did when I swapped before, thoughts? suggestions? Yes John C have allen head and can mark twist and see results tomorrow
floridamechanic
Well-Known Member
Going to equalize pressures with shims first thing this afternoon, bet the builder did not have test stand to flow/pressure test and set pumps after rebuilding.
funwithfuel
Senior Member
By the way those pieces of material that you pulled out of the relief valve or they Iron or bronze is hard to tell from the picture checking with a magnet to see for sure