155d FEL guick tatch or forks

[rScotty]

I don't really know how much I've lifted with that loader. Something over 500 pounds in the bucket would be my guess. Yours is the same as mine. I'm sure I've tried to lift all it will do. The hydraulics aren't all that powerful on the YM155/165 loader, so it can handle anything it will lift, and you won't hurt anything if the load won't lift.

An interesting feature of that loader is that the breakout force at the bucket lip is about twice what it can lift to full height. My guess is that this was done to protect the front axle bearings. What it means is that even if the loader with forks attached cannot lift a load, it may still be able to rotate the bucket enough to get the load off the ground. That may not help with a project, but it's a curious feature of this loader.

I've attached the specs on the stock loader. The first is the manufacturer's advertising sheet while the second seems to be the result of an actual test. They are fairly close. Don't get too hung up on the differences, just keep in mind that how much anything can lift depends on how far the weight is from the pivot point. The longer the lever arm, the less weight can be lifted.

The key is a formula like this: Weight times Lever Arm Length = Torque

The specs shows that we can lift (approximently) 500 pounds with a lever arm measuring roughly (17+25+10) or 52" from the loader upright to the Center of Gravity of the loader bucket. So our torque is 52 inches times 500 = a torque of 26000 inch pounds.
That is our answer: we can change the lever arm or the weight, but when we multiply them together we find our maximum lift when the the answer is 26,000 inch pounds. Twenty six thousand inch pounds is the maximum torque our YM155 loader hydraulics can develop around the pivot point when lifting a load to full height. We can call this 26000 inch pounds our max torque.

So to answer your question, suppose we put some short forks on the bucket so that we can lift a different load that is farther out. This new load has it's center of gravity about two feet out beyond the lip of the bucket. This new load might be pallet with a load on it or maybe a couple of short logs we want to carry somewhere.
Anyway, now we have moved the center of gravity of the load out farther from the loader uprights. our lever arm is now longer. In fact it is about (17+25+10+11+24) or 87 inches long. To find out how much we can lift now, we divide our max torque by the length of our new lever arm.
26000 divided by 87 = 298 pounds. And that's your answer. Out where you will be using your forks you can lift about 300 pounds.
Enjoy!
rScotty

 

[chevy791979]

I don't really know how much I've lifted with that loader. Something over 500 pounds in the bucket would be my guess. Yours is the same as mine. I'm sure I've tried to lift all it will do. The hydraulics aren't all that powerful on the YM155/165 loader, so it can handle anything it will lift, and you won't hurt anything if the load won't lift.

An interesting feature of that loader is that the breakout force at the bucket lip is about twice what it can lift to full height. My guess is that this was done to protect the front axle bearings. What it means is that even if the loader with forks attached cannot lift a load, it may still be able to rotate the bucket enough to get the load off the ground. That may not help with a project, but it's a curious feature of this loader.

I've attached the specs on the stock loader. The first is the manufacturer's advertising sheet while the second seems to be the result of an actual test. They are fairly close. Don't get too hung up on the differences, just keep in mind that how much anything can lift depends on how far the weight is from the pivot point. The longer the lever arm, the less weight can be lifted.

The key is a formula like this: Weight times Lever Arm Length = Torque

The specs shows that we can lift (approximently) 500 pounds with a lever arm measuring roughly (17+25+10) or 52" from the loader upright to the Center of Gravity of the loader bucket. So our torque is 52 inches times 500 = a torque of 26000 inch pounds.
That is our answer: we can change the lever arm or the weight, but when we multiply them together we find our maximum lift when the the answer is 26,000 inch pounds. Twenty six thousand inch pounds is the maximum torque our YM155 loader hydraulics can develop around the pivot point when lifting a load to full height. We can call this 26000 inch pounds our max torque.

So to answer your question, suppose we put some short forks on the bucket so that we can lift a different load that is farther out. This new load has it's center of gravity about two feet out beyond the lip of the bucket. This new load might be pallet with a load on it or maybe a couple of short logs we want to carry somewhere.
Anyway, now we have moved the center of gravity of the load out farther from the loader uprights. our lever arm is now longer. In fact it is about (17+25+10+11+24) or 87 inches long. To find out how much we can lift now, we divide our max torque by the length of our new lever arm.
26000 divided by 87 = 298 pounds. And that's your answer. Out where you will be using your forks you can lift about 300 pounds.
Enjoy!
rScotty

View attachment 531098View attachment 531099

Nice work! Great post. I've lifted 9- 80lbs bags of sac create with mine. Lol. It didn't like it and the tractor tried to come off the ground when I got off of it to unload them by hand. Mind you, these were in the buck as far back as possible inside it. My ballast box is the one Yanmar sold with this tractor when it was new and is full of gravel (ca-6). And I have 5 gal of concrete on it also for crazy lifts (for this little tractor). I more or less tried to do that to see if it would do it. The relief valve hated it but it did it.

The fact that putting the load out at the bucket cutting edge will almost cut the break out rating in half makes me want to build a set of pin on forks.

 

[rScotty]

Nice work! Great post. I've lifted 9- 80lbs bags of sac create with mine. Lol. It didn't like it and the tractor tried to come off the ground when I got off of it to unload them by hand. Mind you, these were in the buck as far back as possible inside it. My ballast box is the one Yanmar sold with this tractor when it was new and is full of gravel (ca-6). And I have 5 gal of concrete on it also for crazy lifts (for this little tractor). I more or less tried to do that to see if it would do it. The relief valve hated it but it did it.
The fact that putting the load out at the bucket cutting edge will almost cut the break out rating in half makes me want to build a set of pin on forks.

Yep. I'm not surprised you were able to lift about 50% more than the specs call out. Although I am betting it lifted slowly in a series of small jerks as you worked the hydraulic lever at high revs. Take a look at the loader psi; the loader specs are rated at only 800 psi, which is the continuous flow rating. But the YM155 hydraulic system is ultimately limited by a relief valve which is set at over 1100psi. So if you rev it up, you can "bump" the lift lever and get a momentary advantage of more pressure to the cylinders to make the bucket lift more by jumping up half an inch at a time. That will work - for awhile - for any hydraulic system.

That 900 lb break-out rating is out at the bucket lip already. That YM155 loader breaks out pretty well - better than some bigger tractors.
As you point out, the lift limit is likely to the be the weight of the tractor itself. It sure would be nice to make up some sort of quick change bucket/forks for that loader. I've got the standard skid steer quick change (SSQA) on a larger tractor and sure do like it. But it's just a little heavy for the YM155. Not that it wouldn't work, but the 155 just doesn't need that heavy and robust of a quick change. There are lots of simpler and lighter quick attach systems.
rScotty

 

[chevy791979]

Can anyone send a picture of their loader valve hose location. Mine is a Yanmar loader and the return line port the say OUT is plugged. And the return oil to tank is in the bottom of the valve going to the tank on my. I'm wondering if I use the outlet port if it will flow more oil when booming down. The manual shows the outlet port being the return port used.

 

[rScotty]

Can anyone send a picture of their loader valve hose location. Mine is a Yanmar loader and the return line port the say OUT is plugged. And the return oil to tank is in the bottom of the valve going to the tank on my. I'm wondering if I use the outlet port if it will flow more oil when booming down. The manual shows the outlet port being the return port used.

There were two ways to hook up the hose connections to that YFL155 Loader. Which one to use depends on whether you are connecting a system using an accessory front hydraulic pump, or whether you are simply using the existing Yanmar hydraulics.

I believe you said that you did not have a front PTO, so my assumption is that you are using the existing Yanmar hydraulics. If so, there will be two parts that we have only briefly discussed - these are a diverter block on the tunnel between your feet, and a selector valve mounted beneath the loader valve. See the attached photos; the selector valve is shown on the first photo and also as part 7 in the third photo.

I hope these original Yanmar instructions help. If not, we need to know which parts you have. Some photos would help.
Or if you want, we can go into a more technical explanation as to what these valves all do and why they are necessary.
Good Luck,
rScotty

 

[chevy791979]

I do have a front PTO pump. Using the right side frame tube as a tank.

 

[chevy791979]

Yep. I'm not surprised you were able to lift about 50% more than the specs call out. Although I am betting it lifted slowly in a series of small jerks as you worked the hydraulic lever at high revs. Take a look at the loader psi; the loader specs are rated at only 800 psi, which is the continuous flow rating. But the YM155 hydraulic system is ultimately limited by a relief valve which is set at over 1100psi. So if you rev it up, you can "bump" the lift lever and get a momentary advantage of more pressure to the cylinders to make the bucket lift more by jumping up half an inch at a time. That will work - for awhile - for any hydraulic system.

That 900 lb break-out rating is out at the bucket lip already. That YM155 loader breaks out pretty well - better than some bigger tractors.
As you point out, the lift limit is likely to the be the weight of the tractor itself. It sure would be nice to make up some sort of quick change bucket/forks for that loader. I've got the standard skid steer quick change (SSQA) on a larger tractor and sure do like it. But it's just a little heavy for the YM155. Not that it wouldn't work, but the 155 just doesn't need that heavy and robust of a quick change. There are lots of simpler and lighter quick attach systems.
rScotty

Oh it didn't like doing it and wasn't going but 30ft with it. Lol

 

[chevy791979]

There were two ways to hook up the hose connections to that YFL155 Loader. Which one to use depends on whether you are connecting a system using an accessory front hydraulic pump, or whether you are simply using the existing Yanmar hydraulics.

I believe you said that you did not have a front PTO, so my assumption is that you are using the existing Yanmar hydraulics. If so, there will be two parts that we have only briefly discussed - these are a diverter block on the tunnel between your feet, and a selector valve mounted beneath the loader valve. See the attached photos; the selector valve is shown on the first photo and also as part 7 in the third photo.

I hope these original Yanmar instructions help. If not, we need to know which parts you have. Some photos would help.
Or if you want, we can go into a more technical explanation as to what these valves all do and why they are necessary.
Good Luck,
rScotty

View attachment 531981View attachment 531982View attachment 531983

I have the Yanmar loader manual for this loader and pump. I'll take pics tonight when I get home

 

[rScotty]

I have the Yanmar loader manual for this loader and pump. I'll take pics tonight when I get home.
I do have a front PTO pump. Using the right side frame tube as a tank.

Everyone always likes to see pictures of projects, so if you get time to take some, please post them.

Ok, since yours has a separate front pump the hook up is even simpler. No diverter and no selector. So it ought to be hooked up just like manual says with the "OUT" being the short low pressure return line that goes directly into the top of the reservoir. That would flow the most oil when booming down.

If you have a normal "open circuit" hydraulic loader valve, then I have no idea why someone would plug the "OUT" port and use the bottom port for return flow to the reservoir. I don't even know what that bottom port is - although it is most probably a "Power Beyond" port. With your hooked up like you are saying, it would still be safe enough....meaning nothing would overpressure and blow up... but the loader sure wouldn't have much lift. Normally "OUT" is the low pressure return and the PB port is plugged.

BTW, almost all of the hydraulic loader valves you will run across are "open circuit" type. I guess it is possible that someone gave you the wrong loader valve. It would be rare, but there is another type of hydraulic valve called a "closed circuit" type that has different innards and ports even though they are labeled much the same. You don't see those valves much because not only are they much more expensive, AFAIK only used by some of the medium sized and larger John Deere tractors that have closed circuit hydraulics.


So to repeat what the manual is saying:
With a dedicated front pump, your FEL won't have the diverter block or the selector valve. And the hook up is much simpler.
Basically you go from the pressure side of the front pump with a high pressure line up to the "IN" port on the loader valve. The "OUT" port of the loader valve normally goes to the upper connection on your loader's oil reservoir, and the lower connection goes back to the intake of the pump. Only the pressure hose needs to be special. The other two can be any kind of hose & held on with screw clamps.
Luck, rScotty

 

[chevy791979]

This is how mine was when I got it.
The first picture I'm pointing to the port labeled OUT. The second is the port currently being used for return oil. It's labeled PB