hydrapower drive test?

I have a 1650 parts tractor that has 2 speed hydrapower. Is there a way to test hydrapower with it out of tractor? Tried to look it up in the archives with out success! A buddy has a 1650 that doesn't go into direct so just looking for option's if it a major malfunction! Thanks Greg

We used to run them with a half inch drill and check both the lube pressure and the clutch pressure.

Thank you Mr. Schwiebert, I can turn input shaft only one way is that correct? Hydrapower drive unit has oil cooler on top if that makes any difference. I found an old clutch to use splined hub to make adapter for the drill. Tractor was purchased at auction so don't know it's history but looks pretty good for 7900 hours! Where would you look first on unit that's in tractor now? Thanks again Greg

   Started teaching HPDs back in the mid 60"s.  You can drive the unit on the bench with a half inch electric drill.  Take a radiator hose of the correct size, slip it over the input shaft and the outside of the drill chuck, clamp it on with radiator hose clamps.

  Direct drive clutch pressure should be between 140 to 190 PSI.  Tee in a pressure gauge in the hose that goes from housing to the collector ring tube that comes to the outside of the housing.  Lube pressure should be between 20 to 60 PSI.  Take a 1/8" pipe union and weld it to the top center of the filter.  After welding, drill a small hole through the filter, you are now on the clean side of the lube system.  Since you are now probably running the unit at about 1/2 rated speed of engine, you will probably see pressure at the low end of the spec.  Remember the clutch is a closed center system, thus once the clutch fills ideally it should not require more fluid.  Watch for pressure change between hydropower drive and direct drive, should only drop a couple of PSI.  If pressure drops really low you have a leak in the clutch circuit or clutch piston rings.

  We always recommended draing the type A oil and putting in a mixture of diesel fuel and one quart of oil since this will duplicate the viscosity of the type when it is at operating temp.

You should see the change in sprocket speed change when shifting, you may have to put some resistance against the sprocket to see speed change.

Thanks B A Star, I like the radiator hose idea! I never had any major problem's with 2 or 3 speeds and all were used on the farm. When I bought my 1650 gas engine the farmer threw hydropower in with the deal said it didn't work in direct. It ended up an easy fix just a $16 spring from Agco. Parts guy was surprised so much for that little spring, I said if that all the problem is that's a cheap fix! Thanks for all the info, he just doesn't want to put a lot of money in a tractor older than my wife! Greg

Take the side cover off of both of them. There are serial numbers on those hydra power units. Check them.