Just picked up a 336.. couple quick questions

[walnutman]

Runs good. Looks decent.
There is a large 2-1/2" or so finger wheel that has open and close on it just under the seat facing forward. Right now it's frozen so I'm spraying the threads, tapping lightly with a small hammer and trying to turn it every so often. What is it for?

Also the draft control for the 3pth lever is also frozen. Doing the same with that. Hopefully these things will break free eventually. I can't use heat due to seals and such I suppose.

 

[rScotty]

Congratulations, very nice tractor.
That finger wheel controls the the rate at which the 3pt hitch drops.
The other thing - the 3pt draft control lever - is probably frozen because nobody ever used it.
In fact, both of these adjustments are rarely used.

 

[walnutman]

There is a lever at the 3ph that moves up and down. Bunch of flat linkages wrap around the yoke of the upper arms. Not sure what it does. I ordered all the manuals today

 

[rScotty]

That lever engages/disengages draft control to regulate the ground engagement dept for an implement attached to the 3pt hitch. It's sort of a hold-over from the days when tractors were used a lot for plowing. When plowing it keeps you from having to constantly have a hand on the 3pt lift & lightning reflexes. It's not useful for much of anything else. I don't think I've used that feature on any tractor in 30 or 40 years.
Except once when I left it engaged by accident.....

To see how draft control works, take a look at the top connection of the 3pt hitch on the back of the tractor. See how that top link connection it is actually a pivot and lever?
Well, when the plow contacts an obstruction like a rock underground it puts compressive force onto the top link. That lever is on a heavy spring, but it moves just enough to open a valve inside the rear end that instantly raises the 3pt lift arms an inch or so. If that doesn't clear the rock, it all happens again...very rapidly.

Draft control forces are only crudely adjustable. Most of the time you don't want draft control, so you disengage it with that lever that is frozen up.

Forgetting to disengage draft control when using a 3pt mounted backhoe used to be the cause of many farm-related accidents & deaths.
rScotty

 

[bmaverick]

There is a lever at the 3ph that moves up and down. Bunch of flat linkages wrap around the yoke of the upper arms. Not sure what it does. I ordered all the manuals today

Why order when you can download them for FREE.

YANMAR YM336 PARTS MANUAL

www.tractorforum.com

YANMAR YM336 WIRE SCHEMATIC

tractorforum.com

Or at the Yanmar Tractor Owners Group, link below in my signature.

 

[yanmars]

I have a 336d. Decent little tractors.

 

[walnutman]

Why order when you can download them for FREE.

YANMAR YM336 PARTS MANUAL

www.tractorforum.com

YANMAR YM336 WIRE SCHEMATIC

tractorforum.com

Or at the Yanmar Tractor Owners Group, link below in my signature.

Thank you
I don't see the tach and hour meter in the electrical schematics....

 

[walnutman]

Here she is working

 

[careyo63]

I have this marked from 2011 336D it may help?

 

[walnutman]

I have this marked from 2011 336D it may help?

Same as the one above. Thank you