Re: PTO HP

Posted by Hugh MacKay on September 18, 2004 at 19:15:36 from (64.228.11.1):

In Reply to: PTO HP posted by Pete on September 18, 2004 at 08:57:32:

Pete: I think a bit on this torque-horsepower item can be learned from highway tractors. I have driven just about all Cat, Cummins, Mack, etc. Loaded on the highway you will get variations in power requirments with topography. For example a truck running at 1650 rpm, giving roughly 60 mph. and governed at 1800 rpm. If you lug that truck down to 1400 rpm on a hill, it will recover faster if you maintain your 1650 pedal setting than if you tramp the pedal to the floor.

A few years back I would have scoffed at the idea of cruise control in a highway tractor. They do work and work well. I have tried this with all of them and leave it on cruise, is the answer. There is a limit of course and you must shift.

Most of us grew up on cars and pickups with gas engines where it was pedal to the metal for power, just not so with diesel. In actual fact most diesels develop their max torque at or below 1500 rpm.

One job I have done is haul logs on ice roads with hills. You do as little shifting as possible, as it causes truck to spin out on the ice. Here is where the Cat and the Mack shine. I have seen those engines lug to 800 rpm and yes recover. Not recomended by the experts, but one H#$% of a lot better than going down the hill backwards.

Follow Ups:

• Re: PTO HP Rod F. 04:09:16 09/19/04 (0)

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