Three points hitch: mast adjustement on ASAE S217.12
Three points hitch: mast adjustement on ASAE S217.12
(OP)
Hi all,
I'm designing a three points hitch and I know there is the ASAE S217.12 that imposes some geometric constraints. I don't understand one constraint called "mast adjustment height", it isn't drawn on the standard. Does anyone know, what it is?
Thanks
I'm designing a three points hitch and I know there is the ASAE S217.12 that imposes some geometric constraints. I don't understand one constraint called "mast adjustment height", it isn't drawn on the standard. Does anyone know, what it is?
Thanks
RE: Three points hitch: mast adjustement on ASAE S217.12
What I think they are trying to state is the minimum lower hitch points that the +/-5° mast inclination range can be measured at.
- Low point: Note that the "Mast adjustment height, lowest position" is the same as the "lower hitch point." Looking at a CAT-I this means that you must to have the ability to adjust mast inclination at least +/-5° at 200mm above the gound. If you can still get +/-5° at a lower point its gravy. Realize that due to the geometry, the lower you go the harder it is going to be to get the +/-5° range.
- High point: Again looking at CAT-I, you must have the ability to adjust mast inclination at least +/-5° with the "lower hitch point" at 508mm or more above the gound. And similarly, due to the geometry the higher you go the harder it is going to be to get the +/-5° range. The geometry is designed to kick the rear of the implement up at the high lift range to facilitate transport of long implements (i.e. plows).
ISZ
RE: Three points hitch: mast adjustement on ASAE S217.12
thanks a lot, with your explanation I have understood it perfectly. The ISO standard is equal to the ISO you looked at. What a pity ISO didn't provide any picture for it.
Cheers
RE: Three points hitch: mast adjustement on ASAE S217.12
RE: Three points hitch: mast adjustement on ASAE S217.12
another question regarding to the ISO 730-1 or the ASAE S217.12. Are they mandatory? Do companies have to design a three point hitch in according to this standard or not? I haven't found any refereces so far.
thanks
Pietro
RE: Three points hitch: mast adjustement on ASAE S217.12
The SAE, ASAE nor ISO can make standards a requirement. Realize that all of these organizations use people in the respective industries to come up with the standards that they will use. What this basically means is that there is very little outside oversight, unless it concerns the public good. (automobile crash regulations, engine emissions, etc.)
This is where homologation comes in. What you need to do is find out if the country where you want to sell your equipment makes them mandatory. Individual governments can make them mandatory, or go above and beyond!
The EU is a prime example. There are the "directives" that cover any machine sold in the EU. A few of the main ones are:
DIRECTIVE 2006/42/EC - machinery directive
DIRECTIVE 2005/88/EC - noise directive
DIRECTIVE 2002/44/EC - vibration directive
DIRECTIVE 74/151/EEC - tractor directive
In theory these are all you have to meet, but in reality some countries go beyond this, often contradicting ISO standards and directives. Italy is a good example of this. If you are going into Europe I would strongly suggest getting a company like TUV involved.
And then there are countries like the USA where standards may not be required by law, but if someone gets injured and you don't follow the "voluntary" safety standards you will loose a lot of money in court cases.
ISZ
RE: Three points hitch: mast adjustement on ASAE S217.12
thanks for your reply. I got it. In the directive you have mentioned, any ISO standard isn't mentioned about the three point hitch, but few companies in their tractor datasheet write the three point hitch category, so it should mean the most of them don't follow any standard, right?
Best regards
Pietro
RE: Three points hitch: mast adjustement on ASAE S217.12
In reality it is probably tough to meet all the 3pt requirements considering all the other options and tire choices that are offered in the various markets. I wouldn't be surprised if they cut corners a little, but you would have to measure very carefully to find out.
ISZ
RE: Three points hitch: mast adjustement on ASAE S217.12
RE: Three points hitch: mast adjustement on ASAE S217.12
RE: Three points hitch: mast adjustement on ASAE S217.12
I'm sorry for the delayed reply I was on holiday. By the way for the dynamic radius index I mean the radius that it is used exclusively for the calculation of forward ground speed during homologation procedures.
RE: Three points hitch: mast adjustement on ASAE S217.12
You also have to consider other options. Will you see different performance with a "quick hitch"? What about two wheel drive vs. MFWD, claw vs. ball ends, 540 vs. 1000 rpm PTO, etc. Some tractors have multiple holes for the top link, meant to increase the tipping action with long implements like plows. Many tractor chassis also come with different classes of 3 pt. hitches, depending on the power. For example, it is very common in North America to find tractors with class 3 and 4 narrow.
ISZ
RE: Three points hitch: mast adjustement on ASAE S217.12
thanks for your reply, does the rolling radius change on the several configuration for a specific tractor?
what do you mean for " to increase the tipping action with long implements?".
thanks
Pietro
RE: Three points hitch: mast adjustement on ASAE S217.12
My comment about the different configurations is that you will have to review if, for example, the pin center for attaching the implement to the lower arms moves between configurations. Different tire configurations will alter the pitch of the tractor. Some tractors have both 540 and 1000 rpm PTO shafts, at slightly different heights.
As far as tipping action goes, I am specifically talking about how the geometry tips the implement forward as it is raised. If you have a long implement like a 6 bottom plow you may want to increase the tipping action to increase road clearance for the last bottom during transport.
ISZ
RE: Three points hitch: mast adjustement on ASAE S217.12
RE: Three points hitch: mast adjustement on ASAE S217.12
RE: Three points hitch: mast adjustement on ASAE S217.12
RE: Three points hitch: mast adjustement on ASAE S217.12
ISZ
RE: Three points hitch: mast adjustement on ASAE S217.12
I was again on holiday. Btw the lift rod regulation was introduced in order to enchance the three point hitch connectivity, right?
RE: Three points hitch: mast adjustement on ASAE S217.12
ISZ
RE: Three points hitch: mast adjustement on ASAE S217.12
where a CAD tool has been created to help the designer to design a three point hitch able to follow the ASAE S217.12 standard. In the three point hitch design I think it is also necessary to take into account the lifting perfomance measured in according of the OECD code. There I created a tool to design a TPH. Would it be useful for designers to take into account to design a three point hitch?
RE: Three points hitch: mast adjustement on ASAE S217.12
thanks
Pietro
RE: Three points hitch: mast adjustement on ASAE S217.12
In reality you don't want a lack of lifting force to be lowest limit in your system. This will make customers think you have a weak tractor. Farmers will add weight to the front of the tractor to offset the lack of stability. (water/salt mix in tires, iron weights) I have seen large water tanks mounted to the front just to add ballast. On the negative side this is stressful to the tractor structure, adds to soil compaction, and burns extra fuel.
ISZ
RE: Three points hitch: mast adjustement on ASAE S217.12
RE: Three points hitch: mast adjustement on ASAE S217.12
I'm not suprised that similar tractors from different manufacturers have similar lifting forces. As customers compare specifications nobody wants to appear lacking. There are always the 1% of customers that will push the limit, but like you suggested previously there is a practicle limit that most customers will not exceed.
ISZ
RE: Three points hitch: mast adjustement on ASAE S217.12
RE: Three points hitch: mast adjustement on ASAE S217.12
RE: Three points hitch: mast adjustement on ASAE S217.12
By the way...I found an old paper, where it's written it is necessary do apply two times the gravity force of an implement to remove it out from the ground. Taking into account the heaviest implement , I get the same order of size of the maximum lifting force for a specific tractor size
RE: Three points hitch: mast adjustement on ASAE S217.12
I have just realized that in a normal implement the CoG is moved rearward than the one used at the OECD test. Therefore in normal working condition the lifting force is lower than the one measured with the OECD test. What do you think about it?
thanks
RE: Three points hitch: mast adjustement on ASAE S217.12
I can tell you from experience that some things are very black and white while other aspects are not. One example is taking production varience into account. If you did a statistical analysis of your 3pt hitch design there is probably a +/-0.5% possible varience. Though the difference is small, what number gets put into the sales literature?
ISZ
RE: Three points hitch: mast adjustement on ASAE S217.12