4640 no brakes or steering

Jd44A_1 · Jun 12, 2017

Was baling and lost all brakes and
steering. Thinking its the steering
valve by the steering column ??? Am I
correct ?? Thanks guys.

David G · Jun 12, 2017

If the 3 point and hydraulics work, I would suspect priority valve.

tim s · Jun 12, 2017

Not the steer valve,,most likely the stroke control valve in the front pump

Cliff Nelson · Jun 12, 2017

Priority valve will never block steering or brakes as they receive their oil before the priority valve.

matthies · Jun 12, 2017

Tim's more than likely right. But had friend come pick me up to look at his 4640 when he lost hyd. Front crankshaft bolt backed out and the dampner hammered the keyway out of it and the front pump stopped turning. Won't mentioned how he fixed it, but ended up with a different engine during the process.

Tx Jim · Jun 13, 2017

Ditto what Tim stated. What trans does tractor have?

Jd44A_1 · Jun 13, 2017

Sorry that i didnt mention the trans.
Its a Syncro.

Jd44A_1 · Jun 13, 2017

Thanks Tim !! I will check pump cupling also.

tim s · Jun 13, 2017

I have a pump that was acting like that here now,off a 4640, the guy said he was chiselling and it lost steering and 3pt.he pulled the pump and dropped it off.I haven't looked at it yet,,but I will tell you what I find when I get into it,,I'm thinking stroke valve..

DONMYEIL · Jun 14, 2017

Check the hex shaft that runs from the rear case to the flywheel .They will round off and quit turning the transmission pump . A new shaft will buy some time but eventually the trans pump will have to be pulled . Its behind the center link bolted to the main case .Just pull it out, you will see where the pump gears run .

4640 no brakes or steering

Jd44A_1

Member

David G

Well-known Member

tim s

Well-known Member

Cliff Nelson

Well-known Member

matthies

Well-known Member

Tx Jim

Well-known Member

Jd44A_1

Member

Jd44A_1

Member

tim s

Well-known Member

DONMYEIL

Member

Similar threads