336D wont stay into gear

hawks000 · Apr 26, 2017

I have had my 336D for about 5-6 years and LOVE IT ... but recently I had to put a head gasket on it. SO While I had it in the shop I thought " now would be a good time to change all fluids" after all I've NEVER changed them since I had it & who knows how long before :thumbdown:

anyway my tractor has always slipped out of 3rd gear (not the power shifter) and so I thought I'd take the time & pull off the cover & have a looky .... I even went as far as to take the shifter forks out and they don't appear to be bent and from what I could tell everything looked good ?? :confused2: so I KNOW I am missing something ... so I Thought you all might help me?

What could be wrong with it?
I've attached pictures so you can see the forks

also another question is.. where is the dang hydraulic Screen ? I took the screw on filter off but can not find where the screen should be

another question :confused2

maybe this be the last one) does anyone have a wiring diagram they could share , more specifically the starter solenoid & key switch ?

SO thanks in advance ...

careyo63 · Apr 26, 2017

This should be it.....

yanmars · Apr 26, 2017

I had that problem maybe 15 years ago on my 336D. I thought it was a spring/detent ball as I recall. A cheap fix. I will try to bring my manuals home to check your questions.

winston1 · Apr 27, 2017

Yanmar Popping Out Of Gear

I believe your suction screen is right below the pto shaft.

hawks000 · Apr 27, 2017

Thanks careyo63 this will help alot !!:thumbsup: Do you have one that shows the solenoid as well ? I have one black wire that isn't connected to anything and I am trying to figure out where it goes as well but again thanks

hawks000 · Apr 27, 2017

Thanks

yanmars

I have read online that it may could be the detent ball \ spring but I dont know where it's located at?? Only spring I've seen is connected to the shifter lever , I didn't see any other sprigs.

hawks000 · Apr 27, 2017

winston1 said:
Yanmar Popping Out Of Gear

I believe your suction screen is right below the pto shaft.

winston1 thanks for the Link and the location of the tube , I was checing under her and on her side ...I didn't think to check her "backside" :laughing::cool2:

winston1 · Apr 27, 2017

hawks000 said:
Thanks I have read online that it may could be the detent ball \ spring but I dont know where it's located at?? Only spring I've seen is connected to the shifter lever , I didn't see any other sprigs.

Don't know about the 336 but some models have detents in the rod the shift fork slides on. The shift fork will have a spring and ball that goes in that detent. Make sense?

Something similar to this. SHIFT FORK 3RD & 5TH GEAR: Yanmar Tractor Parts

careyo63 · Apr 27, 2017

A good guess would be the Thermostart. All the way to the bottom or if you printed it to the far Right. BLK. to Thermostart Switch. This is what my Thermostart looks like. I had to run wire and connect mine. Which is Blue. Turn your key backwards to get power to it. I very seldom ever have to use mine but It does work and good when cold. I don't have a fuel Bowl so this is how I get fuel to it. Then disregard or squirt it back into my fuel tank.