Lost all gears at stop light!!!

Driving a int. 4700 single axle dump truck loaded 7 ton. This truck has a 5spd/2spd. Splitter. I stopped at the light, put the truck into neutral, pushed the two spd. Button down (electric two speed). The light turned green I put the truck in gear let out on the clutch and nothing happened. I tried it with the two spd. Button in the up position and still nothing. I ended up being towed. When the tow truck un hooked I dumped the load and all gears were working fine. I drove the truck 150 miles home. Has anyone had this problem?

 

Yea, that is what I was thinking, the two speed was the problem. I guess it is like the two speed in between the hi,low gear, but I really don't know how it works. Has this ever happened to anyone else?

 

If the two speed is in say second hi, you have to leave the button in hi to shift to third, then while you are still in third gear you can push down the button and up the rims to activate the lower gear. These are simple shifters, but if one does not know how to use the button and rims correctly, it's a mess up every time.