Ky Grain Farmer
Member
I have a 1973 ford LN900 Grain Truck, it has a 18 ft dump bed with air breakes and tandem axles. the very back axle is lifted up and you can raise and lower it if you want to... my question is, in the cab there are TWO levers that raise and lower the very back axle, the FIRST BIG lever on the steering column says "not for parking" and when I hit the FIRST lever the back axle lowers without putting air in the airbags. but there is another SMALL lever on the dash with a PSI gauge right beside it and when I hit the SMALLER lever while having the FIRST lever turned OFF, the back axle not only lowers but raises the back end of the truck up just a little.... so my real question is what is the difference between the two levers and when should i use them and when not to use them??????????
the only thing I can think is that the first lever is for driving on the road with a load on with no down pressure on the rear axle and the second lever is for putting down pressure on the very back axle to raise the back end so that all the weight is resting on axle closest to the end of the bed when your dumping a load and not sittin on the front rear axle but that is only my guess. so someone who knows please help because we will be putting over 20,000 LBS of corn in this truck this fall. I cant afford to make a simple mistake to a simple solution... PLEASE HELP
the only thing I can think is that the first lever is for driving on the road with a load on with no down pressure on the rear axle and the second lever is for putting down pressure on the very back axle to raise the back end so that all the weight is resting on axle closest to the end of the bed when your dumping a load and not sittin on the front rear axle but that is only my guess. so someone who knows please help because we will be putting over 20,000 LBS of corn in this truck this fall. I cant afford to make a simple mistake to a simple solution... PLEASE HELP