Currently on a 2 - 5 day processing time.
A lockout valve is
needed when an implement with two functions is added to the front of your John
Deere Garden Tractor and:
- The implement angle or curl seems lazy or moves due to external
pressure or load.
- The mower deck or 3 point hitch moves with the implement angle or
curl.
This
valve is recommended when tractor ballast supported by a 3 point hitch exceeds
300 lbs. See NOTE below for more information.
Our
Heavy Duty Lockout Valve fits John Deere 425, 445, 455, X465, X475, X485, X495,
X585, X595, and all X700 series tractors up to and including current
production!
Reference:
OEM Part Number: AM134625 - OEM Price: $205.10 USD
OEM Part Number: AM118213 - OEM Price:
$128.22 USD
NOTE: There are three pressures in a given
hydraulic system: load, pump, and return. Load pressure is different from the
pump pressure due to a little load lock check valve embedded in the
hydraulic control valve. This load lock valve is there to prevent drop of a
partially lifted load when the control valve lift pressure is re-applied. The
load is partially lifted stopped then the operator continues up. Without the
load lock check valve the load would drop a little before starting back up. The
drop before starting up is an undesirable condition and is solved by adding
that load lock check valve in the control valve body.
This check valve creates
another situation however. External forces acting on the hydraulic system are
trapped by the check valve. There is no pressure relief valve. It's way back at
the pump. The lockout valve is trapped in that part of the hydraulic circuit
and is exposed to pressure exerted by those external forces. Those external
forces can cause load pressure spikes two times higher than pump pressure.
External forces are described as bouncing loads and scooping up loads.
Click to View Installation Instructions
