What type / brand oil for road ranger

[Darmeisner]

My IHC dump truck with DT 466 and Fuller RT 610 road ranger transmission gets noisy after a few runs. Would Amsoil be the best gear oil for squeezing more life out of it? Hopefully a few mechanics can provide some feedback experience. TNX.

 

[Bill Stockard]

In our truck shop, we filled the older Roadrangers with 90 weight single viscosity mineral gear oil, not a hypoid type rear axle oil. The new over the road tractors get Eaton Synthetic for extended warranty benefits. If your transmission is high mileage, you might try 90 weight mineral gear oil.



To me, the RT610s always seemed to be noisy in combination with the DT466 engine. I sold many 12-14 yard tandem dump trucks with this combination to local excavation contractors.



Bill

 

[Darmeisner]

Thanx for the help. I've never used mineral oil before, but i'll give it a try.

 

[CKelley1]

i would stick with that eaton synthetic and add moores or one of the other additives that you see at napa with the crank on the gears, it gave us about 200k more out of a rto13

 

[Darmeisner]

I've had the truck less than 1 year, it was serviced before I got it. According to the bill, they didn't change it, just added 90 wt gear oil. Since road rangers have no synchros and I'm not a professional truck driver, I was hoping for a miracle cure for my shifting. Something really slippery for smooth engagement.

 

[Bill Stockard]

I've had the truck less than 1 year, it was serviced before I got it. According to the bill, they didn't change it, just added 90 wt gear oil. Since road rangers have no synchros and I'm not a professional truck driver, I was hoping for a miracle cure for my shifting. Something really slippery for smooth engagement.

For me, and I'm no experienced truck driver, the DT466 with a Roadranger RT610 or a RT613 was more difficult to shift because the engine's rpm fell off faster than a big bore Cummins. Except when starting from a stop, I shifted them without the clutch while "feathering" the throttle, not "hurrying" the shift, and "feeling" for the gears with the stick.



Bill

 

[Hoefler]

The 610 and the 613 used 90w gear oil. The 6610 and 6613 used 50w mineral oil. The newer transmissions work best if you double clutch them. By "feeling for the gears with the stick" you are grinding the corners off the sliding clutches and the gear. By doing so, you are decreasing the contact between the sliding clutch and the gear and causing the contact area to become tapered, which leads to the sliding clutch jumping or popping out of the gear.