Adjusting 7308 Pressure Relief Valve Setting: New Holland Tractor Review  -- New Holland Tractors Discussion Forum and Review Adjusting 7308 Pressure Relief Valve Setting: New Holland Tractor Review -- New Holland Tractors Discussion Forum

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 05-08-2003, 20:35 Post: 54540
cdcole



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 Adjusting 7308 Pressure Relief Valve Setting

Very surprised this morning when I went to lift a 1952 Dodge Power Wagon axle (about 800lbs). The relief valve stopped the lifting but I was able to curl the bucket back with the chain over the front of the bucket - such that I could get the unit off the ground to move it. Very disappointing to say the least. Called New Holland and they want me to bring it there to be adjusted - 35 miles away - with a fee.

Any advice? You can email me at: my 3 boys at execpc dot com






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 05-09-2003, 06:11 Post: 54556
drcjv.



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 Adjusting 7308 Pressure Relief Valve Setting

I had similar problem and found out my loader pressure was set 300lbs psi too low from factory. I also know of two other loaders set too low and have heard of others. When I ask the dealer he told me it was fairly common and sent a mechanic out to test and set the pressure. He increased the pressure about 600lbs psi. I tested the loader after the adjustment and it lifted 2016lbs with ease it would of lifted more but I could not fit anything else in the bucket. The tractor (TC33D, 7308FEL) has worked flawlessly for about a year. There are some saftey and sructural concerns with doing this and I have discussed these in detail in some other threads but, good commonsence should keep you and your tractor safe. If the tractor is still under warranty I would tell the dealer to come to you and there should not be a charge for the service call. I would not recommend you do this yourself unless you have the proper gauges and tools as well as understanding to do so.






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 05-09-2003, 07:40 Post: 54558
Mrwurm



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 Adjusting 7308 Pressure Relief Valve Setting

I have posted this very same question myself. I suspect that someone out there knows how to adjust the pressure but they are not talking. For you situation, I would suggest doing a simple adjustment. The 7308 loader is spec'ed to lift about 900lbs on a TC33. So, place the 800lb object (axle) in your bucket along with another 100lbs of stuff. Make small adjustments to the pressure relief until the loader will just barely lift the load. Now, of course, we need someone to tell us where the adjustment point is.
Jerry






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 05-09-2003, 09:04 Post: 54565
DRankin



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 Adjusting 7308 Pressure Relief Valve Setting

Reading this thread and the other one about the fan blades hitting the radiator makes me wonder if the two are connected.

Maybe they turn the pressure down at the factory to reduce the frame flexing that causes the fan blade/radiator interference.

What do you guys think?






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 05-09-2003, 09:16 Post: 54567
AC5ZO

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 Adjusting 7308 Pressure Relief Valve Setting

The FEL advertised specifications are a little bit optimistic. I believe that the lifting force for one thing is specified from the bucket pivot point which is closer to the tractor than the end of the bucket. I also believe that the lifting weight specifications in some cases do not include the bucket weight. Still, most people find that the 7308 is a very capable loader that can easily lift a full bucket of the heaviest material. And, if the loader pressure is at the high end of the allowed pressure range, it will lift beyond the advertised load. We only seem to approach the limits of its capability when lifting machinery.

The reason that you can rotate the bucket and lift a heavy load when the main cylinders will not lift the same load is that the bucket cylinders have a higher mechanical advantage. The bucket lifting force is specified as the breakout force and it is significantly above the lifting capability of the loader. This force is required when you are using the loader bucket to pry out a rock or something but you need to be careful. Using the bucket to lift a heavy load causes higher than normal pressures to be in the hoses of the main lift cylinders when the spool valve is closed. This is dangerous and I don't think that the relief valve can perform its safety relief function in this situation.

Adjusting the relief valve pressure is not complicated. If as in drcjv's case, your pressure is low, it would help to have it adjusted to specification. But, it is not advisable to go beyond the specified maximum pressure. It can be adjusted with some very inexpensive NH parts and a more expensive guage system for the hydraulic pressure. This is not an area for untrained mechanics to be working in. The final pressure that you set will determine how much stress and strain are placed on your FEL and tractor.

I would not advise that you do this yourself unless you have all the proper parts, tools and experience to know the whole story and potential consequences. It is possible to "hot rod" the hydraulic system to exceed the NH specifications, but you have to ask yourself if it is worth doing so since you will be exposing yourself, anyone else around, and your equipment to potentially dangerous overload conditions. A skilled operator may never experience any problems, but the dangers and potential liability will still be there.

If you need to lift the full specified load on any loader, you should lift in line with the loader pivot pin. If you have a quick attach bucket, then take the bucket off and lift from the frame. It is best to use lifting straps that are made for hoisting. Use rear ballast to maintain the balance of the tractor/FEL/load.






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 05-09-2003, 09:27 Post: 54568
AC5ZO

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 Adjusting 7308 Pressure Relief Valve Setting

Mark, I think that the reported fan blade interference problem has been on the next frame size tractors. (35-45 HP)

I have a TC45 w 16LA and I have not seen the fan issue. I lift very heavy loads with it. I try to balance loads as best I can, but I do move over uneven terrain.

Relief valve pressure can certainly be set to limit the maximum load on a loader. It is adjustable, at a risk. Alternately you could also install larger lift cylinders, modify the attachment points for the cylinders and other things to increase the load capability. Proceed at your own risk.






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 05-09-2003, 10:12 Post: 54572
drcjv.



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 Adjusting 7308 Pressure Relief Valve Setting

AC is this de'ja vue or what. Mrwurm the adjustment is under the joystick cover on the right fender.I would not recommend doing this on your own unless you have the proper training and tools as in the past I do not always agree with AC but, his safety and stuctural concerns are very valid. I had the dealer do this for me and the mechanic was not even sure what to do the first time out. I love the increased lifting capacity but, the risk of accident has also increased. Mark I have not heard of any fan problems on the TC33D.






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 05-09-2003, 12:04 Post: 54577
cdcole



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 Adjusting 7308 Pressure Relief Valve Setting

Lot's of very good advice - Not sure what I will do yet.

Also - very surprising to me that my JD318 would raise the front tires off the ground with a snowblade. My old Ford 600 with it's Bush Hog loader could easily raise the tires off the ground too. With the Boomer - only the bucket curling down will raise the tires. Definitely need to fix this. Often to get good down pressure - I intentionally lift the front end up with the loader - right now I am missing that capability. Tractor is out of warranty.






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 05-09-2003, 15:39 Post: 54583
drcjv.



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 Adjusting 7308 Pressure Relief Valve Setting

Lifting the front on the 7308 is limited by the length of the main cylinders not only by lifting ability. Put a 6 inch block under your bucket and it should lift the front end although in your case if the pressure is low it could effect this. I think it would be well worth the money and time to have a dealer check and adjust the loader pressure.






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 05-09-2003, 21:32 Post: 54590
Mrwurm



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 Adjusting 7308 Pressure Relief Valve Setting

"place a block under the bucket and see if it will lift the front end"

Nope, no way. My TC30 with 7308 won't do it and my neighbor's 1920 with 7308 won't do it.

When I was shopping for my TC30 last year I mentioned the limited loader capacity to the dealer. He sent it into the repair bay with a tech. Five minutes later it returned and could lift the front with the loader. I did'nt end up buying from that dealer. So, what did he do and where did he do it. I know he did not have time to tap into a line and install a gauge. Maybe he put a quick-connect gauge on after the selective control valve between the valve and the quick connect for the hose??

I would like to have mine spec'ed out by the dealer but he is 30 miles away and would probably charge me for transport and labor if there turns out to be nothing wrong.

Jerry

Jerry






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Discussion Boards > Active Subjects > Messages as Posted > New Holland Tractor Review Forum

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