Hydraulic
System
Reelmaster 6500-D/6700-D Hydraulic SystemPage 4 - 23
Right and Left Turns
In addition to supplying hydraulic flow to the cutting unit
lift circuits, gear pump section (P3) supplies hydraulic
flow to the steering control valve for turning the rear
wheels.
With the the engine running and the steering wheel in
the neutral position (rear wheels positioned straight
ahead), the spool of the steering control valve is in the
center position. Hydraulic flow enters the steering con-
trol valve at the IN port, by-passes the rotary meter (V1)
andsteeringcylinder,andexitsthroughthecontrolvalve
through the AUX port. The flow continues on to the lift
manifold (see Raise Cutting Units and Lower Cutting
Units in this chapter) and returns to the hydraulic reser-
voir.
Left Turn
With the engine running, and the steering wheel turned
to the left,the flowtravels through the top of the steering
control spool. Flow enters the steering control valve at
the IN portand isdivided into two paths. Mostof the flow
throughthevalveisdirected outtheAUXportbacktothe
lift manifold, and on to the hydraulic reservoir. The re-
mainder of the flow is sent through the r otary meter (V1)
and out the (LH) port to the rod end of the steering cylin-
der. The rotary meter ensures that the oil flow to the cyl-
inder is proportional to the amount of steering wheel
rotation. The steering cylinder retracts, which results in
a turn to the operator’s left when the vehicle is moving
forward. Fluid leaving the steering cylinder flows back
through the steering control valve, exits through the
OUT port, travels to the lift manifold, and returns to the
hydraulic reservoir.
Right Turn
With the engine running, and the steering wheel turned
to the right, the flow travels through the bottom of the
steering control spool. Flow enters the steering control
valve at the IN port and is divided into two paths. Most
of the flow through thevalve is directedout theAUX port
back to the lift manifold, and on to the hydraulic reser-
voir. The remainder of the flow is s ent through the rotary
meter (V1) and out the (RH) port to the piston end of the
steering cylinder. The rotary meter ensures that the oil
flowtothe cylinderis proportionaltothe amountofsteer-
ing wheel rotation.The steeringcylinder extends, which
results in a turn to the operator’s right when the vehicle
is moving forward. Fluid leaving the steering cylinder
flows back through the s teering control valve, exits
through the OUT port, travels to the lift manifold, and re-
turns to the hydraulic reservoir.
