MaX28XlL is 98 lb weakling, Main Pump Pressure Low

[mike69440]

My 2013 Max28 XL shuttle has less than 4 hours on it. I bought it as a new leftover in NY State. (Tier 3!)
I have not worked the machine other than play move some snow, but immediately noticed the loader seemed especially weak.

The machine has no ballast, in fact the front guard is removed to add a expanded metal grill guard.

The loader will barely, just barely start to lift the front tires off ground.

The Blade my excavator weighs less than 1100 lbs, Just trying to lift one corner with it in float, the Max 28 loader will barely budge it.
My Max 28 bucket will not even break out a good load of soft snow in a pile.

My tired weak smaller Kubota has as much fight, if not more.

First thing I tried was the relief valve on the loader, as it looks it was ever adjusted as there is like no paint marring from wrenching.

Turning the screw in made no difference, nor did two turns screwing it out. It took 3 full turns out on the adjustment screw for me to notice any difference in loader performance.

Therefore my conclusion is the main pump relief is set very low.

That will mean also the 3 pt lift won't be worth anything.

I'd be happy just to be able to be at 90% of advertised rated capacity.
Could someone tell or better yet post a diagram or photo of how to set the mail pump pressure and just where is the pump relief valve located?

I'd very much appreciate it very much, as a old guy with poor eyesight crawling around in the mud is not pretty.

PS: I think I see it hiding behind the loader frame on Left Side?

 

[BobG_in_VA]

I assume its under warranty? Why are you trying all these things...have the dealer take care of it or have him/her take it back...Don't know what else to say.,.. BobG in VA

 

[mike69440]

I assume its under warranty? Why are you trying all these things...have the dealer take care of it or have him/her take it back...Don't know what else to say.,.. BobG in VA

a. BOUGHT OUT OF STATE. That would be over a 500 mile road trip.

b. Even if local dealer gave me time of day, I'd have to haul it there at my time and expense. Still a 50 mile haul.

c. In 15 years, the only time (once) any of my equipment has been serviced by anyone but me, it was an insurance claim due to fire.

 

[J_J]

Your tractor probably didn't have a FEL from the factory.

So the 3pt relief was the only and main relief.

Since someone added a FEL, the pump flow probably goes to the FEL first, and therefore, the FEL relief now sets the relief pressure for the tractor.

If in fact the FEL relief pressure was set wrong, or the relief springs are broke, the FEL relief setting will limit the power the tractor has as to the FEL and the 3pt.

I recommend installing a 3000 psi hyd gauge in a tee in the IN port of the FEL valve, and use it to trouble shoot and monitor the tractor hyd system.

Hyd gauge setup should cost about $30.

Did the relief actually work when you held the lever to max cyl cycle?

You did check fluid level, and filters are good.

.

 

[J_J]

Your tractor probably didn't have a FEL from the factory.

So the 3pt relief was the only and main relief.

Since someone added a FEL, the pump flow probably goes to the FEL first, and therefore, the FEL relief now sets the relief pressure for the tractor.

If i fact the FEL relief pressure was set wrong, or the relief springs are broke, the FEL relief setting will limit the power the tractor has as to the FE and the 3pt.

I recommend installing a 3000 psi hyd gauge in a tee in the IN port of the FEL valve, and use it to trouble shoot and monitor the tractor hyd system.

Hyd gauge setup should cost about $30.

Is your FEL relief screw adjustable or shim adjustable?

.

 

[drajj5]

Mike

I totally understand your reasons for not wanting to go to the dealer, you and I are similar in that regard. I will try and post up the hydraulic flow charts and related pump relief valve location for you in the morning; I have the day off work.

Others have posted about sticking or not fully connected Quick disconnect fittings on your loader. Wouldn't hurt to disconnect and reconnect those hoses to see if that is your culprit.

The loader will not lift the wheels too far off of the ground with a flat/level bucket. If I roll my bucket down then lower the arms it will lift the front of the tractor plenty high though

Don

 

[mike69440]

Your tractor probably didn't have a FEL from the factory.

So the 3pt relief was the only and main relief.

Since someone added a FEL, the pump flow probably goes to the FEL first, and therefore, the FEL relief now sets the relief pressure for the tractor.

If in fact the FEL relief pressure was set wrong, or the relief springs are broke, the FEL relief setting will limit the power the tractor has as to the FEL and the 3pt.

I recommend installing a 3000 psi hyd gauge in a tee in the IN port of the FEL valve, and use it to trouble shoot and monitor the tractor hyd system.

Hyd gauge setup should cost about $30.

Did the relief actually work when you held the lever to max cyl cycle?

You did check fluid level, and filters are good.

.

Part of my day job is to design hydraulic machine tool fixtures. I thought this was going to be a sinple adjustment of the loader valve.
With the brutal weather and other projects, I really have not even bothered to get into sorting this out till now, but I will get a test gage Tee'd into the inlet to the FEL to see what he main pump is up to.
I kinda doubt anything is up upth the loader relief spring, Then again sometimes new out of the box is messed up.

Looks like I'll be ordering some qick connects and fittings from Surplus Center.

Drajj5;
Thanks for looking into this. I was not planning to have to scrounge up a service manual this soon.

 

[J_J]

mike69440 ,


You asked where the pump relief is.

Open center hyd systems generally do not put a relief valve at the pump.

The hyd circuit should have a relief at the first valve in the flow path. The setting on this relief valve will set the max operating pressure for the other valves.

Each valve could have a relief valve and you might have three or more on a tractor.

You would logically set them all the same.

 

[drajj5]

Ok This is for the Max 28 shuttle.... there are some variations between the auto and the manual shift (these are for the manual)

Hope this point you in the right direction

Good luck, J_J is right - you will need a hyd gauge to check the pressures. Please post your results as I am curious as to what is causing your issues
Don

 

[mike69440]

Ok This is for the Max 28 shuttle.... there are some variations between the auto and the manual shift (these are for the manual)

Hope this point you in the right direction

Good luck, J_J is right - you will need a hyd gauge to check the pressures. Please post your results as I am curious as to what is causing your issues
Don

Don

Thank you. I appreciate you even titled the photos!

I'll order fittings and plug in a gage.