Yanmar RSA1201 Tiller Gauge Wheel repair

[Yanmar F15D]

@Yanmar F15D that is quite the adventure! I'm not surprised that you doing the repairs yourself raises a few eyebrows. In my very limited exposure to Japanese agricultural practices, my impression was that the expectation was that the service center would fix things. As challenging as they are, I love the small fields, and watching farmers working the small plots.

All the best,

Peter

I was quite surprised how many don't do their own repairs! But I think that is more of a cultural thing here. Most people bring things back in to be repaired rather than fixing them themselves (whether a small appliance or changing engine oil).

I have 4 medium size rice fields I'm using this year. I'll try to find a picture of my Yanmar in action to share. But I agree, it's nice to see the fields come alive this time of the year. The other day when I came home, my neighbor, along with two of his friends (these are men in their 60s), was sitting back relaxing against a house after a long day of cutting weeds eating ice cream, and joking around. A fun sight to see.

 

[Yanmar F15D]

Comparison of the two 4514 bearings.
Left is OEM (Maker is Nachi 45BCS14)
Right is NJ-4514 from Frederick's.
Size for thr 4514 is 45mm x 80mm x 18mm

 

[bmaverick]

I was quite surprised how many don't do their own repairs! But I think that is more of a cultural thing here. Most people bring things back in to be repaired rather than fixing them themselves (whether a small appliance or changing engine oil).

I have 4 medium size rice fields I'm using this year. I'll try to find a picture of my Yanmar in action to share. But I agree, it's nice to see the fields come alive this time of the year. The other day when I came home, my neighbor, along with two of his friends (these are men in their 60s), was sitting back relaxing against a house after a long day of cutting weeds eating ice cream, and joking around. A fun sight to see.

Yes, it would be great to see how the machines are used today in their homeland. Some rice paddy fields there are so deep and other shallow. I don't know why really. As you have 4 fields, can you explain how these Yanmars do their work. I've only watched YT vids with no understanding of the work.

 

[ponytug]

Comparison of the two 4514 bearings.
Left is OEM (Maker is Nachi 45BCS14)
Right is NJ-4514 from Frederick's.
Size for thr 4514 is 45mm x 80mm x 18mm

Wild.

In general, for the same alloys, more balls of the same size gives a larger load capability as the total load L is spread over more points of contact, provided that the force on the race and the ball isn't excessive. There is going to be a pressure trade off between larger balls, with a lower surface pressure, and more balls with potentially a smaller indivicontact area.

It is not clear to me that there is "one" answer. I would trust the bearing supplier to have made a bearing compatible with the load specifications of that bearing.

Good luck,

Peter

 

[bmaverick]

Wild.

In general, for the same alloys, more balls of the same size gives a larger load capability as the total load L is spread over more points of contact, provided that the force on the race and the ball isn't excessive. There is going to be a pressure trade off between larger balls, with a lower surface pressure, and more balls with potentially a smaller indivicontact area.

It is not clear to me that there is "one" answer. I would trust the bearing supplier to have made a bearing compatible with the load specifications of that bearing.

Good luck,

Peter

I would trust the slightly smaller with more balls as the inside race (ring) is a thicker wall. Less prone to cracking when load stresses slam on it.

 

[Yanmar F15D]

Yes, it would be great to see how the machines are used today in their homeland. Some rice paddy fields there are so deep and other shallow. I don't know why really. As you have 4 fields, can you explain how these Yanmars do their work. I've only watched YT vids with no understanding of the work.

As it's my first year with my tractor but what I've seen from other farmers is that they are just tilling, tilling, tilling. Then fill up the fields with water, let them sit for a day or less, and then till again. After that, the fields will have rice put in. I just picked up a Yanmar rice transplanter from a local farmer who retired. Interesting machines.
I don't see tractors really used for anything else. I am hoping to find a stronger tractor with a front loader in the future so I can deal with my compost more efficiently. But for now, the 15hp should do fine.

 

[ponytug]

I'm more familiar with rice culture in other countries. Mostly what one is dealing with in rice paddies is pure clay. If one the first tilling one gets the soil into fairly small chunks, and then flood it, the soil will hydrate quickly, and be uniform enough to either retill or plant in day. I think that clay is a funny substance, and it is often faster to go from dry to fully wet than from damp, solid clumps, and the process is very pH dependent. (And clay for pottery is a very different story, but one that Japanese potters excel at.)

What I have seen is that the seed paddies are very carefully tilled to get a very uniform slurry/mud to plant into. Transplanted seedlings are more tolerant.

Then you have the Louisiana approach of helicopter seeding rice and crayfish. Rather different process, but one might argue that their primary business is in crayfish culture, not rice, based on the relative economics, and profits.

All the best,

Peter

 

[careyo63]

Like to see the Pics. no doubt about that!! Rice patty tires I still use to the day. Old and ugly Org. Bridgestone no doubt but they work with no leaks. Reline and new tubes in 2016. Gempler's. Mow wkly. this time of the Yr. and noticed how far the cracks spread. The large tread works great for mowing my typical Ga. rock hard clay. When it's dry and no tracks!! They had some cracks when I bought it 900 tach. Hrs. I put on them I don't think I'll wear them out! When the soil is wet I can tear it up..... No wheel weight. My ford Liquid Loaded rears.

 

[bmaverick]

I'm more familiar with rice culture in other countries. Mostly what one is dealing with in rice paddies is pure clay. If one the first tilling one gets the soil into fairly small chunks, and then flood it, the soil will hydrate quickly, and be uniform enough to either retill or plant in day. I think that clay is a funny substance, and it is often faster to go from dry to fully wet than from damp, solid clumps, and the process is very pH dependent. (And clay for pottery is a very different story, but one that Japanese potters excel at.)

What I have seen is that the seed paddies are very carefully tilled to get a very uniform slurry/mud to plant into. Transplanted seedlings are more tolerant.

Then you have the Louisiana approach of helicopter seeding rice and crayfish. Rather different process, but one might argue that their primary business is in crayfish culture, not rice, based on the relative economics, and profits.

All the best,

Peter

Here in the USA, the oldest and largest rice paddy fields are in the Carolina's. Well over 100,000 acres from the 1940s and earlier. Then the world wars broke out and the rice era nearly ended until 1984 when a duck hunter rediscovered it. Today, the Carolina rice is grown in the Carolina's, Georgia and Louisiana. There is a small area in California too.

 

[ponytug]

Here in the USA, the oldest and largest rice paddy fields are in the Carolina's. Well over 100,000 acres from the 1940s and earlier. Then the world wars broke out and the rice era nearly ended until 1984 when a duck hunter rediscovered it. Today, the Carolina rice is grown in the Carolina's, Georgia and Louisiana. There is a small area in California too.

Thomas Jefferson grew rice back in the 1700s, in Virginia, and the barrier island rice from the Carolinas is a special item.

All the best,

Peter