International S1900 dump truck frame matl.

[Ncostello]

For welding purposes, what type of steel (psi, heat treated?) would typically have been used for a 1989 International S1900 tandem? It has a double frame, DT466, Allison Auto. Served life as a municipal snow plow/dump truck.

 

[mwilson]

Are you repairing the frame or adding to it???



Mike.

 

[CKelley1]

we have used 7018 for years to weld brackets and extend frames including the double frame international

 

[mwilson]

we have used 7018 for years to weld brackets and extend frames including the double frame international

Same here. Welds one rusty anything to another rusty anything.



Mike.

 

[Bill Stockard]

For welding purposes, what type of steel (psi, heat treated?) would typically have been used for a 1989 International S1900 tandem? It has a double frame, DT466, Allison Auto. Served life as a municipal snow plow/dump truck.

IIIRC, tandem drive medium duty International trucks that vintage were equipped with 110,000-psi steel frames. The frame rail flanges were heat treated. Some were equipped with inverted L frame reinforcement and some were equipped with a full channel frame reinforcement, depending on how they were ordered and/or the wheelbase.



Bill

 

[Dizo]

Like Bill said, also you cannot weld or drill on the frame flanges past the radius. You can weld and drill on the web, DOT regulations. Mike D.

 

[Ncostello]

It's a double frame truck, with extended front frame. However the double frame ends at about the motor mounts forward. We were having some steering "slop" issues and had taken the truck to a "reputable" frame/spring HD shop who said there was nothing wrong with it. Not being satisfied with that we did out own teardown to see exactly what was going on. First the spring hangers and bushings were SHOT creating alot of the slop. Next we found the frame had some cracking on the passenger side steering gear mounting area.



It looked repairable so we stripped it down, cleaned everything well and followed some good practice procedures that seemed to be common on everything I could find about something like this. We ended up using a "fish plate" repair on the inside of the frame, making sure to keep clear of the flanges and not build up alot of heat. Everything was bolted back on using fine thread, flange head frame bolts of the correct length. All new holes were perfectly drilled to the exact bolt size using a mag drill. The gent doing our welding is a real pro. I'd trust his work on anything.



Anyhoo it seems to be working very well and were going to keep monitoring for future cracks or problems.

 

[Bill Stockard]

You must have dual power steering which indicates the truck may have either a 16,000-lb or an 18,000 front axle. Dual power steering was usually standard with those two axles and it was optional with a 12,000-lb axle.



IIRC, the double frame usually stops at the front just past the rear of the front spring hangers unless it was ordered with a full length double frame which was usually ordered if a crankshaft driven front engine PTO pump was to be installed.



It sounds like your frame shop did a good job on the repair.



Bill

 

[DValentine]

FYI-There are other rods above E7018. 80,90 up to E11018. Pre/Post weld heat treat is advisable. GregH, or others might have more info. For my use, the highest tensile rod I have used is 90.

Dave