JD 4020 hydraulic pump coupler

J Key · Sep 23, 2014

Replaced the coupler to the hydraulic pump 3 weeks ago. Put all new parts in, torqued the bolts on the coupler to 35 ft lbs. Put about 20 hrs on the tractor bush hogging and today the new coupler broke where it clamps on the hydraulic shaft, thus no hydraulics. any idea on why the new part would break? Got it on the net for $93. would it be possible there is a better made part available? Or, other problem that could cause this new part failure?

Tx Jim · Sep 23, 2014

Are engine side frame & hyd pump support bracket to engine bolts tight?
Possibly the drive coupler you purchased had a flaw in it.

LarrySTN · Sep 23, 2014

Pretty sure you over torqued the clamp bolts, but that info is at the shop and I'm not. I have already broken one when I tried to torque it to 35.

D- · Sep 23, 2014

I have accounts with A&I and Hy-Capacity but will only use that shaft from Deere.

J Key · Sep 23, 2014

Won't be fixing for a couple weeks. If you are someone has torque spec for the 2 bolts (3/8 x 1 1/4) please let me know. Thanks for the help

J Key · Sep 23, 2014

Ordered from Deere today

DONMYEIL · Sep 26, 2014

Torque is 35 ft. lbs. . Sounds like the aftermarket may have been cast iron and not cast steel .That pump can use 25 hp. when it calls for full flow .

tim s · Sep 26, 2014

Yes I have a 30hp electric motor running my test stand with 3 belts, at full flow it works it some.

JD 4020 hydraulic pump coupler

J Key

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Tx Jim

Well-known Member

LarrySTN

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D-

Well-known Member

J Key

New User

J Key

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DONMYEIL

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tim s

Well-known Member

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