John Deere 1951 Model B Power Trol issue

i attached a 3 point conversion kit to my power-trol
and noticed it turns very slowly and and doesn't
turn at all when attaching the mower to it. It also
will only turn about 20 degrees. I don't know what
normal is, the tractor was just handed down. so
far, i've learned online it may be some o rings that
need replaced. curious if anyone has any experience
or suggestions. thank you.

Post a picture of the back of your tractor showing the powr-trol and the 3-pt.

photos attached. thank you for considering my questions.

PTO engaged when trying to operate the lift arms ? Power-Trol full of oil ? Clutch engaged while operating the lift arms ??

yes husker, clutch on and pto spinning. no problems with the pto when dragging a mower from the hitch. as i mentioned, the powr-trol will only turn about 20 degrees, even without the 3 pt attachment on it, and not at all with a mower on the 3 pt
1.) how much should it turn?
not sure about the oil, but is was serviced before i got it.
2.) does the oil go in the pipe cap (labeled a33r in the photo), and it is full when you can see it?

Yeah - that's the oil fill for the PowerTrol. There's a petcock on the right hand side of the PowerTrol unit. Open the petcock and pour in oil until it starts to run out the petcock. Hopefully, you're just low on oil.

IRRC, In your manual you will find a description of how to adjust the powr-trol unit for remotes or rockshaft operation. There are two adjustment screws under caps on the powr-trol. One is for rockshaft speed and the other I believe is for the rockshaft/remote setting.

As a follow-on to what 55deere70 said, check the position of the "metering screw". It's on the upper left side of the powr-trol. It has a long hex nut as a cap. Remove the cap and then loosen the jam nut under the cap. Using a flat screwdriver, turn the screw "in" until it bottoms out. Then turn the screw "out" 2 full turns. Tighten the lock nut and replace the long cap nut. If the previous owner used a remote cylinder instead of a 3pt you might find the metering screw is turned all the way in or close to it.

If this doesn't fix the problem, check the fluid level in the powr-trol. It takes straight 30 weight engine oil.

If the problem is still not fixed the leather cup or the packing ring on the rockshaft piston is probably shot and allowing pressurized oil to leak around the piston back to the oil reservoir. It's not a hard job to replace the cup or packing ring. If you have to do this start a new post and we can help you.

If you don't have a parts manual, go to jdparts.com and find the place where you can do a "manual" search. Type in PC330. Be patient, it takes a long time to download. When it does download scroll down to page 102 and look at key #s 9,17,& 18. These are the two different type "seals" that go on the rockshaft piston.

Correction:
Go to jdparts.com and find where you can do a "catalog number" search. Then type in 330.

thanks guys, i have a shop manual that discusses the metering screws also. heading out to check the oil then perhaps the metering screws. appreciate the advice, little less stress now. hope to update with good news!

just added some oil and the powr-trol is picking up the mower and moving faster! thanks for all the suggestions. i may mess with the set screws at a later date, happy to have this success for now!

(quoted from post at 09:29:02 09/05/13) just added some oil and the powr-trol is picking up the mower and moving faster! thanks for all the suggestions. i may mess with the set screws at a later date, happy to have this success for now!

Click to expand...

That's good news...you should still check the screw that bbard mentioned to make sure it is set for rockshaft operation.

One other thing I thought of today...These tractors only have around 1300psi in the hydraulic system. They weren't designed to lift heavy 3pt equipment. I put an aftermarket 3pt similar to your on my model B and It wouldn't pick up a 5ft brush hog more than a few inches. I shimmed the spring on the relief valve with some washers to get enough pressure to at least lift it up high enough for transport. I don't know how much pressure it has now but it will pick up the mower now.