Hydraulic Flow Diagrams Page 4 - 10 Reelmaster
®
335-D
Reservoir
No. 2 Lift
Cyli
Val
ift
Val
3
1
2
nder
No. 3 Lift
Cylinder
Lift Valve
Counter
Balance
ve
No. 1 L
Cylinder
Charge
Relief
ve
Filter
ENGINE
Aux.
Pump
Oil Cooler
Pressure
Lift/Lower Circuit – Lifting Cutting Units
Return
Suction
Oil from the secondary pressure port of the auxiliary gear type pump goes to the
three-spool valve, then through the counterbalance valve, oil cooler, filter, and back
Flow
to reservoir. Each lift valve spool controls a separate lift cylinder. 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.
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