Groundsmaster
®
455-D Page 4 - 9 Hydraulic Flow Diagrams
Reservoir
Lift Cyli
Orbitrol
Check
Val
Check
Val
Aux.
Pump
Wing Li
Cylinder
Lift Cyli
Balance
Val
Bal
Lift Circuit – Lifting Center Cutting Unit
Pressure
Center Unit
nder
Steering
ve
Lift Valve
ve
Filter
ENGINE
Return
Suction
ft
Center Unit
nder
Counter
ve
Wing Counter
ance Valve
Oil Cooler
Wing Lift
Flow
Oil from the secondary pressure port of the auxiliary gear type pump goes to the
Cylinder
three-spool valve, then through the counterbalance valve, oil cooler, filter, and back
to reservoir. Each lift valve spool controls separate lift cylinders. Check valves in
each spool section hold the cutting units in the raised position. When a lift lever is
moved to the lift position, the valve spool moves to direct oil flow to the lift cylinder,
lifting the cutting unit. An orifice in the lift port of each cylinder limits the speed of
cutting unit lifting and lowering. A counterbalance relief valve in the return line creates
a constant back pressure in the lift circuit to transfer some of the cutting unit weight
to the traction unit.
Hydraulic System
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