Quickie loader, very slow. WHY?

[jahmes143]

Update...I removed the fill cap with tractor running and do faintly hear a slight bit of frothing sound. Perhaps see a few air bubbles on dipstick but hard to tell (will add oil dye next week and see if it makes bubbles show up easier.

Tractor doesn't have rear remote, so no detent to get stuck.

No oil leaks/seeps anywhere, so not sure whether the potential air leak is coming from.

 

[rScotty]

Pressure gauges ordered. Will report back next week.

Nice. I'll look forward to working on it with you.

If you want to try something while you are waiting, go back up to post #7 and look at the that hydraulic diagram. Do you see the two joints in the suction pipe where the 050 O rings are used? Get in there with some stretchy rubbery electrical tape or some stretch & seal self-fusing silicone tape or maybe just some silicone gasket goo and wrap the outside of those two joints.
Don't take them apart, that would be a mess. Just try to seal around the outside with something easy to remove and see it that helps...

I never have fully trusted that method of "O rings comressed on a steel tube" that Kubuta uses there.
rScotty

 

[jahmes143]

@rScotty Gauges came in today. Pressure is reading ~2500psi. I was able to rubber tape one of the 050 o-rings (at the joint of 2 steel tubes), but no real clearance to get tape around the joint by 050 joint by the filters.

Looking for air bubbles...maybe maybe one here or there, but definitely not foamy at top of dipstick or anything.

Loader is still extremely slow.

Is there a way to test whether air is getting in on the suction side?

Should I check for anything else?

 

[rScotty]

@rScotty Gauges came in today. Pressure is reading ~2500psi. I was able to rubber tape one of the 050 o-rings (at the joint of 2 steel tubes), but no real clearance to get tape around the joint by 050 joint by the filters.

Looking for air bubbles...maybe maybe one here or there, but definitely not foamy at top of dipstick or anything.

Loader is still extremely slow.

Is there a way to test whether air is getting in on the suction side?

Should I check for anything else?

Darn....I was hoping for a suction leak, but OK. It is sounding like it isn't a suction leak, so next we look for a flow restriction. Basically the procedure is to insert the adapter T with its gauge everywhere we can by interrupting every hose we can - starting with the pump to the FEL {IN) port.
While the T is in line we work the hydraulic controls - and hope we see a reading on the gauge that we can't explain.

Where is the gauge adapter inserted now to get the 2500 psi? I'm assuming that you are using one of the "T" adapters in the set so that the adapter is in series with one of the hydraulic hoses. And also that the gauge is on one leg of the "T", right? Is that how it is?

However it is hooked up, let me knowwhere you have that "T" adapter plumbed: And it makes sense each location to note what else was goiing on and the pressure as the FEL is Raising, Lowering, Straining in overload, or just sitting there...

 

[jahmes143]

@rScotty Yes, it's plumbed how you described, with the T in series and gauge on one leg. T is located very close to fuel filter...on the "passenger" side near loader valve. T is screwed into a welded port on the cylinder barrel very near where the rod comes out of the cylinder. Pressure is 0 under no load and remains 0 during all functions of the FEL other than it spikes to, and stays at, 2500 when bucket touches ground and raises front wheels off ground.

 

[oldnslo]

Have you timed the cylinder movement - velocity to determine actual flow rate. If not I would do that as a baseline to determine actual flow rate vs it seems slow.

To do this you need to pick an engine RPM for all of the velocity tests.

You will need to know cylinder diameter for this.

Formula for figuring flow based on velocity is: Flow = cylinder velocity times cylinder area. This provides flow based on operation of a single cylinder. For a typical loader you are operating 2 cylinders so divide calculated flow by 2 to get actual pump flow.

Since cylinder area in expressed in square inches I find it is the easiest to convert velocity to inches per second and to cubic inches per second.

NOTE: Measure the actual cylinder movement and not loader movement

 

[jahmes143]

@oldnslo I have not timed flow rates. Starting at full curl up, it takes about 10 seconds to get to full curl down. My redneck math says that's very slow.

 

[oldnslo]

@oldnslo I have not timed flow rates. Starting at full curl up, it takes about 10 seconds to get to full curl down. My redneck math says that's very slow.

I agree that does sound slow but reason for inquiry on flow is the flow = speed while pressure = force. I presume raise and curl are equally slow ( can’t remember what has been posted)

RScotty method of taking pressure readings will tell you if there is a restriction potentially limiting flow.

Your post on no pressure till bucket movement is restricted points towards no restriction in that portion of the circuit

 

[jahmes143]

@oldnslo lowering operates normal speed. Raise & curl up/down are all 3 very slow. Thinking I'll get an in-line flow meter to test gpm flow rates. Found a good Omega on ebay for $100 OMEGA OIL FLOW METER 25 GPM 1 NPT HIGH FLMH-1025BR-HT PCCLR07536 3500PSI | eBay

 

[oldnslo]

Lower speed is probably gravity so that makes sense. Flow meter is a nice tool in the tool box for problems like this. Is there space to install it in the pressure line from the pump?