4035 PST Hyd pressure relief valve location?

[Halfcabnut]

Hello
Can anyone help me locate the pressure relief valve. I've tested pressure at the loader valve and seems I'm currently at about 1850 PSI. I have checked the strainer and its clear new filter installed still low reading.
It dosen't appear that relief is in loader valve. Will I find it in the pump? or is it remotely located? 225hrs on tractor ,Power shuttle model.
Thank you
Dan S

 

[Halfcabnut]

Hello
Can anyone help me locate the pressure relief valve. I've tested pressure at the loader valve and seems I'm currently at about 1850 PSI. I have checked the strainer and its clear new filter installed still low reading.
It dosen't appear that relief is in loader valve. Will I find it in the pump? or is it remotely located? 225hrs on tractor ,Power shuttle model.
Thank you
Dan S

Tumble weeds and Crickets .. LOL Hopefully I can figure this out.Dealership was little to know help.

 

[jb1390]

Hello
Can anyone help me locate the pressure relief valve. I've tested pressure at the loader valve and seems I'm currently at about 1850 PSI. I have checked the strainer and its clear new filter installed still low reading.
It dosen't appear that relief is in loader valve. Will I find it in the pump? or is it remotely located? 225hrs on tractor ,Power shuttle model.
Thank you
Dan S

It's an open center system, so pressure relief should be within the valve. I don't think there's a system level relief.

Have you checked other circuits? Do you have an auxiliary port on the rear? What does that measure at?

The loader valve is a pain to get to if it's constructed like my 3550, not sure if you've disassembled to look at the valve, or just tried to find the relief setting from underneath the machine.

 

[Halfcabnut]

It's an open center system, so pressure relief should be within the valve. I don't think there's a system level relief.

Have you checked other circuits? Do you have an auxiliary port on the rear? What does that measure at?

The loader valve is a pain to get to if it's constructed like my 3550, not sure if you've disassembled to look at the valve, or just tried to find the relief setting from underneath the machine.

JB1390
Sure appreciate the help. I do have rear remotes and I obtained approx same pressure reading at them. I have removed loader valve from frame of tractor but have not removed any lines or such, made it a little easier too look at.
It does not appear to have a place for a relief . Valve body is manufactured by Cross but I'm unable to locate a model# I was hopeful I could locate a schematic. Underneath Tractor I have found a Valve that's manufactured by Brevini Fluid Power,Model#M82101020A I'm not sure if this has something to do with relief or not ,or possibly pertains too the hydraulic shuttle? So far I'm kind of at a loss. Sure appreciate any advice or such..

Thanks
Dan

 

[jb1390]

JB1390
Sure appreciate the help. I do have rear remotes and I obtained approx same pressure reading at them. I have removed loader valve from frame of tractor but have not removed any lines or such, made it a little easier too look at.
It does not appear to have a place for a relief . Valve body is manufactured by Cross but I'm unable to locate a model# I was hopeful I could locate a schematic. Underneath Tractor I have found a Valve that's manufactured by Brevini Fluid Power,Model#M82101020A I'm not sure if this has something to do with relief or not ,or possibly pertains too the hydraulic shuttle? So far I'm kind of at a loss. Sure appreciate any advice or such..

Thanks
Dan

Backing up a step, do you know your gauge is accurate? Do you have another machine to test on? What symptoms led you to check the pressure in the first place?

 

[Halfcabnut]

Jb1390
I believe my Gage is fairly accurate. Just recently purchased it which i guess doesn't necessarily mean it's good tho.
What lead me too checking things out is I have noticed loads that was once fairly easy too lift now have become a challenge. Getting ready for winter i move 4 tons of pellets a year .
Pellets are packaged on skids of 2000 lbs .
I've always just pulled 15 bags from skids which 1 bag is 40 lbs reducing my load to 1400lbs of skid weight. Now my forks and location of weight relative too pin reduces my loader capacity i know. But I've never had problems with that load before at all. I couldn't budge it this year. So that sent me down the path of looking for trouble.
I've checked loader leak down and it appears very good. I placed forks approximately 2ft of ground and left over night . Hadn't moved 1/4 " overnight.
Just seems I'm not making the pressure like i once was . Thank you so much for your time trying to help.

Dan

 

[doneill127]

Not sure if it's the same but my Max has a Cross loader valve also. The loader valve does have a relief but there's also a system relief that's adjusted by shims in the hydraulic block. Should be able to go to the Mahindra site and look at the parts diagram and see if you have the same set up. I have the cross valve info but it's out in the barn. I'll get you it later

 

[jb1390]

Jb1390
I believe my Gage is fairly accurate. Just recently purchased it which i guess doesn't necessarily mean it's good tho.
What lead me too checking things out is I have noticed loads that was once fairly easy too lift now have become a challenge. Getting ready for winter i move 4 tons of pellets a year .
Pellets are packaged on skids of 2000 lbs .
I've always just pulled 15 bags from skids which 1 bag is 40 lbs reducing my load to 1400lbs of skid weight. Now my forks and location of weight relative too pin reduces my loader capacity i know. But I've never had problems with that load before at all. I couldn't budge it this year. So that sent me down the path of looking for trouble.
I've checked loader leak down and it appears very good. I placed forks approximately 2ft of ground and left over night . Hadn't moved 1/4 " overnight.
Just seems I'm not making the pressure like i once was . Thank you so much for your time trying to help.

Dan

From that description and weights sure sounds like pressure readings are accurate. If the readings are identical for loader and rear remotes, seems there may be a system level relief. Once you find it, I'd check for a broken spring inside before making any adjustments.

I'll try to look on my machine later to see if I can follow the lines from the pump.

 

[doneill127]

My cross valve is a DV102ACXYD0P03. Here's a link to the cross spec sheet that interprets that. Relief on mine was factory set to 2000psi.https://info.crossmfg.com/acton/att...e-d3d1dac88a9f/1/-/-/-/-/Valves Dv Series.pdf

Here's the direction for adjusting:Valve Adjustments:

Series B and C valves are available with adjustable relief valves - the "F" designation from 500 to 1500 psi (factory preset at 1000 psi) "G" designation from 1500 to 2500 psi (factory preset at 2000 psi). Pressure settings are made at 10 gpm and hence, pressures will be slightly higher at higher flow rates and slightly lower at lower flow rates. To reset, remove acorn nut, loosen lock nut, turn screw clockwise to increase pressure or counter-clockwise to reduce pressure. Series B and C valves are available with pressure released detents which are factory preset at 1000 psi and can be adjusted in the same manner as the system relief valves . (Should be at least 200 psi less than relief valve setting).

Never Attempt To Adjust Pressure Without The Use Of A Reliable Gage In The System.

 

[jb1390]

From that description and weights sure sounds like pressure readings are accurate. If the readings are identical for loader and rear remotes, seems there may be a system level relief. Once you find it, I'd check for a broken spring inside before making any adjustments.

I'll try to look on my machine later to see if I can follow the lines from the pump.

Following the main pressure line from the pump on my 3550, it goes to a distribution valve that likely has crossover relief in it. The loader valve is plumbed off that. That valve is right underneath the hydro pedals. Tough to see in there, best bet might be to remove that valve and check the relief spring on the bench, might've broken. If you know something noticably changed I'd be nervous to try to just adjust it without understanding why it changed.

When I checked pressure on my rear remote a couple years ago, it was around 3000. I was adjusting backhoe relief valves, and my backhoe has individual relief settings for each circuit. Never touched anything system level for the tractor.