MTS MT28 — Scrapers

AMBMike said: Are the scrapers modified? How are they getting 40% more than rated capacity? Click to expand... Either they have ridiculous side boards, or the material is that sticky that it's piling up.

Shimmy1 said: What kind of nonsense is this. Overloading a scraper? I can't imagine anything of the sort. If the tires can't handle what can fit in the scoop, GET DIFFERENT TIRES. Click to expand... Bingo.If they are not full we are not getting anything done.The more opinion I read here and looking at them yesterday they just may be undersized for the design.They are not much more than a loader tire. The remote pressure monitors may be a wise investment. I have a couple pictures but I have to adjust the format somehow

Zewnten said: We run loads of MTS scraper pans. No abnormal tire failures usually just getting punctures from debris or operator error. Personally sounds like the pans are being over loaded, that's on the operators though. They should know when to stop. Click to expand... I see 657-627 cutting till they overflow so that is how the jobsite usually goes

mekon said: looking at them yesterday they just may be undersized for the design.They are not much more than a loader tire. Click to expand... Did you get any of the details I asked for earlier regarding the tyres.?

mekon said: I see 657-627 cutting till they overflow so that is how the jobsite usually goes Click to expand... That's how all scrapers work. Fill the bowl until the material spills over the sides, at that point lower the apron, lift the box and give it beans. There is a very good YT channel on scraper operation by an outfit called SoCal Earthmovers. Their videos shows how scrapers SHOULD be run. - https://www.youtube.com/@SoCalEarthMovers

Nige said: Did you get any of the details I asked for earlier regarding the tyres.? Click to expand... I was hoping to post pictures but a format of heic which I have never seen is stopping me at the moment.The tire size is 26.5R 25 ,more of a loader tire,probably underrated. I amtrying to figure out heic to jpg format.Sometimes I just dislike this electronic age.

Get the photo up on your PC screen and use the snipping tool on it.? Or Google "heic to jpg". It seems to throw up a million results. Unfortunately 26.5R25 tells me very little. It's the make, TRA rating, load rating, etc, etc, (all of which is on the sidewall) that I need.

Curious if the radial tires are the original tires? Radial tires generally squat more. On front wheel assist Ag tractors with loaders many farmers prefer bias ply tires because they keep their shape much better especially when turning sharp. Maybe they put loader tires on that are a lower ply rating?

Well, after a bit of digging, I see that the average weight rating for 26.5-25 tires is about 25k, they can go to 33k. If, and I mean IF they actually are getting over 50 yds per load, if we use 2500 lbs per yard, that's 125k, plus probably about 35k for the scraper to get 160k. Tongue weight on those pans is like 65/35, so let's say conservative numbers put the load on the tires at 100k+. Even if they are running premium tires, 33k each, they could still be overloading tires if they aren't paying attention to where they are driving and running the tires on a ridge. As far as I'm concerned, if they've modified the pans to get 50 yards, they can pound sand and keep spending money on tires. Otherwise, the operators are going to have to adjust their loading if they want to quit buying tires.

I'm also going to throw a few numbers out here. From the MT28 spec sheet the Max Rated GVW is just over 52,000kg. I will assume 56,000. Also from the spec sheet 75% of the weight (42,000kg) when loaded is on the rear axle. That gives a load per tyre of 10,500 kg From my Bridgestone OTR data book a 26.5R25 VMT, TRA E-3, 2-star rated earthmover tyre (recommended for scraper service) will carry 10,600kg using a cold inflation pressure of 69psi, 11,200kg @ 73psi, and 11,500kg @ 76psi. Maximum speed under those conditions would be 50km/h or 30mph.

Need some pics. and more tire info. If higher sides weren't added it couldn't be overloaded that much.

Not running Ling Long Ding Dongs are we?

JD955SC said: Not running Ling Long Ding Dongs are we? Click to expand... Or maybe Double Coin...... OTR Tires, Off-The-Road Tires | Double Coin Tires Double Coin’s OTR tires are heavy duty and built for today’s severe requirements, also see their farm tires, off-the-road tires, earthmover tires www.doublecointires.com

AMBMike said: It's all speculation until we have good data including:

1. Pictures of the tires both pre and post failure.
2. Tire brand, recommended inflation pressure for expected load, and load rating.
3. Tire inflation. Are they over, under, or at recommended inflation for the load?
4. Which tires are failing? Inner, outer, or both equally?
5. Are the scrapers stock or have side boards been added?
6. Are the pulling units tracked or on tires? If on tires are they having failures as well? If tracked are they lasting as expected?
7. What condition are the haul roads?
8. Are the failures happening approximately equally across all units or are some operators experiencing more failures than others? Pictures of normal operating conditions and videos of how the scrapers are typically operated would also help. Click to expand... I think it'd be helpful to have these questions and the questions asked by others answered.

mekon said: OK let me back this up.It seems like belt or cord separation and then a bulging area that blows.The resulting sound from the blow out makes anybody on-site think there is a terror attack. Nige,I assume they are replacing with like spec tires,but I generally stay away from those machines if possible so I don't pay close attention . AMBMike they are usually in mud and clays,currently running in sand.Tire inflation is a good question ,the inner tire is impossible to check, the outer tire would be possible but the guys dont(at least they grease fairly regularly) Questionable Wizards pressure sensors with a cab remote may be the right tool to have,I will pass that idea on to the guys whith the check book. It just seems to me that one of the pans are down every couple of months with a failure. I just never see haul trucks or scrapers with such tire issues. Click to expand... Negligence is the number one killer of tires. I.E. I kicked the tire last week.

AMBMike said: I think it'd be helpful to have these questions and the questions asked by others answered. Click to expand... The OP seems to have lost interest when in fact the solution to the problem was in all probability quite simple.

Nige said: The OP seems to have lost interest. Click to expand... Click to expand... I think you're right. I was hoping to get pics. I really wanted to see 50 yds in a scraper rated for 33.6 yds with factory sideboards.

Shimmy1 said: Either they have ridiculous side boards, or the material is that sticky that it's piling up. Click to expand... That's exactly how they were doing it when I saw it. Super sticky clay just piling up. Was even damaging the rear "spoiler" with how heavy it was.

I thought of this thread and the mention of it being impossible to check the inner tire air pressure on MTS scrapers today when I was looking at an older Icon pull scraper. The tires are currently on the ground but if it was hooked to a tractor with the wheel frame in this position they would be 8-12 inches off the ground and easily rotated by hand. Photos are the showing right inner tire from the left side of the scraper and rear view. This is pretty typical of scrapers I've been around. Are the MTS scrapers set up differently?