Grading--what am I doing to cause this?

[Xfaxman]

Just trying to educate people about other machines

 

[mechtheist]

Just trying to educate people about other machines

It's very definitely 'other'. If I ever need a new tractor, they'll be on my list.

 

[mechtheist]

The requested pix of my road. The rainy one is from a couple of years ago [documenting delivery conditions], you can just see part of the worst spot over the left side of hood, if I got out I'd step in it. In the other photos, it's right under the straggly looking tree with right-leaning hang-over branches. Most of the road is like you see over the right side of the hood, it doesn't matter how wet it gets, it stays firm/hard enough to not rut at all.

 

[KWentling]

Washboard is usually at intersections where traffic speed changes dramatically and/or on steep inclines where wheel slippage gets them started.

The OP's problem is blade chatter.

Interesting to read all the posts and theories. All must be taken with a grain of salt. My roadbed type isn't like the OP's or like most of the posters. We should always consider that. What works for me might not work for the OP.

I've maintained 16,000 miles of gravel roads in NW Missouri over the past 32 years. But I don't know how to maintain his Texas road. I know theories and can offer suggestions that would work for me.

My first is to do the maintenance when the roadbed is damp. In the pic the roadbed is wayyyy too dry.

Interesting discussion though.

This is all spot on. I too maintained roads for the county road and bridge for a few years right out of high school.
Getting people to slow down and not accelerate up the hill that has the 90 degree corner at the bottom is my biggest road maintenance nightmare. That it has been SO dry compounds it.

 

[Little Red Tractor]

I'm certainly not an expert on this, (I've done a bit of raking but not much with any back blade or box blade), but could the pitch of the blade be part of the problem? You would adjust that with the center link

 

[ovrszd]

I'm certainly not an expert on this, (I've done a bit of raking but not much with any back blade or box blade), but could the pitch of the blade be part of the problem? You would adjust that with the center link

A good point. Problem is the top link adjustment probably won't change the pitch enough.

Using a modern grader I'd roll the blade all the way forward which would cause the cutting edge to be trailing rather than leading. That would let it slide over the rocks etc., and fill the low spots with the loose material.

 

[Steppenwolfe]

A good point. Problem is the top link adjustment probably won't change the pitch enough.

Using a modern grader I'd roll the blade all the way forward which would cause the cutting edge to be trailing rather than leading. That would let it slide over the rocks etc., and fill the low spots with the loose material.

Box blades are hard to master, and like you point out, the learning curve is somewhat counter intuitive.

 

[mechtheist]

I have a lot of options to try.

ovrszd I think I could get the same effect by spinning the blade around and dragging it backwards as some have recommended.
So the pix above were from Friday late afternoon, we then got 1 1/4" rain overnight so a good test and it will allow me to go abuse my poor road some more.

In the way too much information department, below pix show what the rain did, overall, I'm pretty happy with it. The problem spot I've mentioned is the trapezoid area, before my latest attempts, it was a fairly deep mudhole after a rain like this. With the wonders of google, it turns out it's about 315 ft of drive and varies in altitude by about 4 feet. I've labeled a few spots with elevation, distance from start and some trees for orientation. I got rid of the worst spot and turned a couple of other deep-ish holes into broader but very shallow puddles that will dry in a day or two.

I don't think the former/original owner who built the road in the early '70s ever added any extra material, the line along the road is where there was a long hump that must have been material removed to cut the road. You can see what he did in these photos, kinda draw a line down the slope to go over the road to meet with ground level on the downhill side. The top middle photo is what the land looks like in a lot of areas. I think you'll get a gravelly road without doing much of anything. The roughly 50'x50' parking area by the house has no soft spots or mud holes, it's like a gravel road, always very solid/hard with occasional fist or so sized rocks popping out once in a while. I even changed its shape with different usage patterns and the new areas are just like the rest of it.

If anyone who understands these things is still paying attention, I was thinking it seems like in this particular case, maybe trying to establish a crown isn't very useful, wouldn't it be better to try for a flat-ish but slightly inclined surface sloping downhill? I'm getting no erosion, the road doesn't rut into the usual two tire tracks, water would just run off downhill along the whole length. Trying to put in a drainage ditch kind of thing on the uphill side doesn't really make sense.

That rain was substantial enough to thoroughly wet the ground and except for a couple of places, my truck tires didn't sink in appreciably. You can tell I was digging down on the downhill side but what I think I should have been doing is grabbing material from the uphill side and using that to build up any low spots and also establish a more definite incline. The lowest spot, if google is right, is the 1043 spot and there's no water collected there.

I'll keep trying, figure out what works, it's a good excuse to go do stuff on the tractor.

 

[K5lwq]

You have received some really good advice and mine is not much different. I would start with breaking up what is there a little. I use a subsoiler but do not go down but about 6 inches.

Then use the rear blade on angle and pull all the material from the edges to the center. This may take a few passes but get as much as you can to the center.

Then turn the blade around backwards and no angle. Then just drive down the center and let the material fan out. You will see the road starting to take shape. Just keep going over it till you have as much or little a crown as you want.

Before long you will get a feel of how to do it and will be a pro. Just take your time and be patient.

 

[ParkWhite]

I angle the grader blade to scrape all loose gravel to the center making at least one pass in each direction. Then I use the blade backwards with no angle to smooth the gravel to the edges of the road. I takes some practice and if you switch to a different tractor or blade you have to relearn your technique. Big rocks and potholes make it difficult and sometimes I just have to resort to good old hand raking and shovel work.