Mahindra 3616 pto not working

BillC72 · Mar 19, 2021

My 3616 pto has stopped working. One day was fine....next time I go to use it...just barley rotates. With the tractor off, turns freely disengaged, and when engaged I can feel the gears turning. Also affects the mid pto. The 3616 HST is a mechanical pto with no solenoid to be the culprit. Any ideas on where to start, or any common failures? I'm thinking of pulling the top off to check the driveline first.

BrokeSolid · Mar 21, 2021

I was just now logging in to post about my issue on my 2007 2615 HST (400 hrs) and the top post is this one. Different tractors but both mitsu so probably the same or similar issue, so I’ll jump on unless it’s turns out mine is different.

Yesterday while using my post pounder, my pto would not engage every time and would kick out occasionally while using if I got it engaged. I had to try multiple times to get it to engage, noticed the mid pto is the same, so was wondering if this is the engagement shaft that both levers connect to or if this is a bigger problem. I have 200 posts to set and not wanting to pull out my clumsy 706.

Sergei1 · Mar 27, 2021

If I've read correctly my tractor has a clutch to engage the PTO, Have you checked your fluid level, also when was the filters, HST and hydraulic last chanced.
Also how many hours since last fluid change.

Sergei1 · Mar 28, 2021

BillC72 said:
My 3616 pto has stopped working. One day was fine....next time I go to use it...just barley rotates. With the tractor off, turns freely disengaged, and when engaged I can feel the gears turning. Also affects the mid pto. The 3616 HST is a mechanical pto with no solenoid to be the culprit. Any ideas on where to start, or any common failures? I'm thinking of pulling the top off to check the driveline first.

You do connect mechanical to the PTO with the lever, but all the power to drive it comes through the HST. I've heard them referred as transmission PTO.
In my service manual in the section on the transmission, not the HST unit, they cover the PTO and last page cover replacing the Hydraulic filter ever 200 hrs.
Does everything work correctly, FEL, steering, 3 point and drive correctly. Trying to see if maybe you've lost a hydraulic pump.

sspenst · Mar 28, 2021

I had a 3016 Shuttle Shift(2014) but it had a electric solenoid button and a mechanical lever to engage the PTO. not sure how the HST on yours works, my 2638 HST is setup sorta like my old 3016. i do have the service manual for the 3016-3616 in PDF if you want it

BillC72 · Apr 1, 2021

You actually sent me the service manual. Thanks for that. Everything else works fine in the hydraulic system. I've been reviewing the manual for some time now and I guess the only way to really diagnose it is to go in from the top. It looks like the pto drive shaft is coupled at each casting from front to back and I'm hoping I have broken a coupler. I was just hoping someone else has experienced this issue before me. None of my local Mahindra buddies have had pto problems.

Sergei1 · Apr 1, 2021

My 2815 should be the same tractor as yours just without all the extra government junk. Could your problem just be a simple problems with your linkage, the bottom link in my book shows a pin for the rear PTO shaft. Could pin be broken ór missing and now it's just slipping on the shaft.
Losing both rear and Mid has me wondering that it could then be inside transmission.

sspenst · Apr 2, 2021

looking at the service manual, I'd say there 3 possible things that might be the problem.
1- the PTO clutch inside could be the issue. most PTO systems uses some sort of clutch pack. I think yours is considered LIVE PTO. you have no wires to activate the clutch.
2- the PTO on/off lever(the the pins that hold the linkage on the shafts, roll pins i think)
3- The shift fork inside the rear axle at the very back could have broken (most likely because both Rear & MID PTO are affected).
I think the very back can be unbolted from the rear of the axle and I think the whole PTO assembly comes out, think there is a coupler on the main drive shaft...
I helped my uncle with his 3215 shuttle tear down and reassembly. (replaced pinion ring gear set, new rear end housing and new bearing holder assembly.) $$$$

I think you may have access via the top cover to inspect the clutch pack.
Inspection camera might help, only two places to enter would be the fill hole in front of seat and there's a pipe plug at the rear of the top cover I think(was on my 3016). if you got or can get a small inspection camera.

Sergei1 · Apr 2, 2021

You mentioned in your first post that when engaged that it was barely rotating. Have you taken hold of the shaft ( very carefully) to see if it under power or just freely rotating.
Does the mid PTO also barely rotate when engaged.
Since you have two separate forks for each PTO on the same PTO rail, do both act the same
With power off and PTO engaged you should only be able to rotate clockwise with resistance and not the other direction at all.

BillC72 · Apr 3, 2021

When engaged, it rotates at about 35 rpm and can be stopped with hand strength. I'm leaning toward the shaft coupling. It feels like it's being driven by oil film at the shaft ends if that makes sense.will check mid pto to see if it rotates at all. We use the tractor almost daily and I just hate to tear it down, but that's where its going.