1969 john deere 4020 hydraulic loss

DMC7 · Nov 5, 2013

tractor will lose steering , brakes,and pto will shut off ,and then go back to normal

Tx Jim · Nov 5, 2013

Could possibly be caused from a worn stroke control valve. How long since hyd filter was changed & sump screen cleaned. I would also recommend checking hyd stand-by pressure which should be 2250 psi.

DMC7 · Nov 6, 2013

FILTER CHANGED .SUPER LOW HR TRACTOR BUT HAS SIT FOR YEARS WHERE IS THE STROKE CONTROL VALVE ?

Tx Jim · Nov 6, 2013

Parts keys 42,43 & 44 in frt hyd pump

buickanddeere · Nov 6, 2013

This must be a side console and the pto clutch is pressurized
via the trans pump.
Low pressure system needs to be tested first. Has he even
said if it was PS or syncro?

buickanddeere · Nov 6, 2013

Have you followed the regular scheduled transmission hydraulic service provided in the operator's manual?
What kind of hydraulic oil?

Tx Jim · Nov 6, 2013

(quoted from post at 12:21:42 11/06/13) This must be a side console and the pto clutch is pressurized
via the trans pump.

Yes b&d '69 4020 is a side console with hyd controlled pto.

DMC7 · Nov 6, 2013

TRACTOR IS A SYNCRO,OIL IS JOHN DEERE,FILTER ALWAYS CHANGED,IN THE BEGINNING WHEN I MADE A SHARP TURN, I WOULD LOSE ALL STEERING AND PTO WOULD SHUT OFF, NOW HAPPENS EVERY NOW AND THEN

Tx Jim · Nov 6, 2013

DMC7
FYI if you type using all upper case letters it's considered shouting(by some not I) and gets some of the "self proclaimed forum moderators" undies in a bunch. :wink:

buickanddeere · Nov 6, 2013

Is the screen clean ?

1969 john deere 4020 hydraulic loss

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