Jd 2840 pto control valve springs

Gieryic · Jan 13, 2021

I posted a question about the springs on a jd 2840 pto control valve in the restoration section. If you have any knowledge of symptoms of the springs being reversed, please provide guidance here or on the other post

Pto engaged all the time....

SVcummins · Jan 14, 2021

I don’t know but there’s a lot finer John Deere mechanics on
here beside me that I’m sure do

Tx Jim · Jan 14, 2021

Welcome to YT
Have you attempted stopping spinning pto by CAREFULLY placing a 4 ft 2x4 between drawbar & pto shaft to determine if shaft will stop spinning??
My 1st guess is pto mechanism isn't installed correctly in pto control valve piston.

tim s · Jan 14, 2021

Strong chance your PTO clutches are gualded together,or a failed PTO brake,,on a 2840 it could ,and probably is both..

Gieryic · Jan 14, 2021

Thanks. I was hoping it was simple. Oh well

Gieryic · Jan 14, 2021

I’ll try the 2x4 tonight. Carefully...

buickanddeere · Jan 14, 2021

Operators of high inertia loads are commonly the demise of PTO brakes .
The PTO is engaged with the engine at full rpm . Then the operator flips the PTO lever to off . That little bitty PTO brake is awful hot, long before the PTO stops turning .

Gieryic · Jan 14, 2021

Shes free. 2x4 did the trick.

Previous owner confirmed it spins without load but with some load doesnt spin due to resistance

Spins with pto engaged but handle doesnt stay up.

Tx Jim · Jan 15, 2021

You need to remove pto control cover(key 4) in an attempt to determine why pto lever won't stay engaged. My guess is shift fork(key 9) is the problem.

buickanddeere · Jan 15, 2021

Make sure the plug #12 is secure . The valve pushed the plug out on my tractor and she was drooling oil .

Gieryic · Jan 15, 2021

I agree with the plan but the control valve is different. Mine is vertical and mounted on the right side of the transmission (under your right foot while sitting).

I have an ancient exploded view - anyone have something clear as Id like to have the parts/gaskets on hand before going in.....

An entire used but functional valve would be great

Thanks

Tx Jim · Jan 15, 2021

I sold new 2840's & don't remember a different type pto clutch control mechanism. Can you please post a photo of your tractor's pto control lever or the exploded view you referred to?

Gieryic · Jan 15, 2021

(quoted from post at 07:16:48 01/15/21)
I sold new 2840's & don't remember a different type pto clutch control mechanism. Can you please post a photo of your tractor's pto control lever or the exploded view you referred to?

The attached photos are not in order

The black shaft with orange rod is the engage/disengage. Up to engage - shown disengaged

The green vertical rod with the jog in it is below the operating platform looking back on the left side of the tractor if you were sitting on it. The vertical steel
Plates are the covers for the control valves

Last - the exploded view is from the tech manual

Respectfully - you may be referencing the main clutch control valve vs the pto control valve.

Gieryic · Jan 15, 2021

(quoted from post at 17:07:25 01/15/21)

(quoted from post at 07:16:48 01/15/21)
I sold new 2840's & don't remember a different type pto clutch control mechanism. Can you please post a photo of your tractor's pto control lever or the exploded view you referred to?

Click to expand...

[img:264b15ac75]https://forums.yesterdaystractors.com/photos/mvphoto68392.jpg[

The attached photos are not in order

The black shaft with orange rod is the engage/disengage. Up to engage - shown disengaged

The green vertical rod with the jog in it is below the operating platform looking back on the left side of the tractor if you were sitting on it. The vertical steel
Plates are the covers for the control valves

Last - the exploded view is from the tech manual

Respectfully - you may be referencing the main clutch control valve vs the pto control valve.

A couple of corrections:

Orange knob, not rod
Valve located on right side of tractor (under right foot) not left

Sorry

Gieryic · Jan 15, 2021

Right side of tractor not left
Orange knob not rod

Tx Jim · Jan 16, 2021

SORRY!

I guess for some dumb reason I must have typed in wrong tractor model when I posted previous parts photo. I forgot 2840 had that type unique pto control valve.

Does your tractors tech manual mention checking pto clutch/brake pressures? If so I suggest to perform that task 1st.

I suggest to check parts(keys encircled in green) plus gasket(key 32) might have failed

Gieryic · Jan 16, 2021

(quoted from post at 03:34:25 01/16/21)
SORRY!
I guess for some dumb reason I must have typed in wrong tractor model when I posted previous parts photo. I forgot 2840 had that type unique pto control valve.

Does your tractors tech manual mention checking pto clutch/brake pressures? If so I suggest to perform that task 1st.

I suggest to check parts(keys encircled in green) plus gasket(key 32) might have failed

Thanks. Thats where I was going...

Gieryic · Jan 16, 2021

Forgive the perhaps stupid question.....

Can I complete this without dumping the hydraulic system contents?

I was about to change the hyd oil and clean the suction strainer but stopped myself.....hy-guard is n0t cheap....

Tx Jim · Jan 17, 2021

I think if valve body is removed it will be necessary to have hyd oil drained

Jd 2840 pto control valve springs

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