Hydraulic Circuit Operation
Steering Circuit
The hydraulic gear pump supplies flow for the steering
circuit and forraising andlowering thebed.Pumpoutput
flows to the steering control valve before reaching the lift
valve so the steering circuit has priority. Circuit pressure
is limited by a relief valve located in the steering control
valve.
Fluid leaving the steering cylinder flows back through
the spool valve, then out the T port and returns to the hy-
draulic reservoir (transaxle).
The steering wheel and steering control valve return to
the neutral position when turning is completed.
When the steering wheel is not being turned with the en-
gine running (hydraulic pump being rotated), flow enters
the steering control valve at the P port and by--passes
the rotary meter and steering cylinder. Flow leaves the
control valve through the E port and is directed to the lift
valve.
Right Turn
When a right turn is made with the engine running, the
turningofthesteering wheelpositions thespoolvalveso
that flow goes through the bottom of the spool. Flow en-
tering the steering control valve at the P port passes
through therotary meter and isdirected outport R.Pres-
sure extends the steering cylinder for a right turn. The
rotary meter ensures that the oil flow to the cylinder is
proportional to the amount of the turning on the steering
wheel. Fluid leaving the cylinder flows back through the
spool valve, then out the T port and to the hydraulic res-
ervoir (transaxle).
Left Turn
When a left turn is made with the engine running, the
turningofthesteering wheelpositions thespoolvalveso
thatflowgoesthrough thetopofthespool.Flowentering
the steering control valve at the P port passes through
the rotary meter and is directed out the L port. Pressure
contracts the steering cylinder for a left turn. The rotary
meter ensures that the oil flow to the cylinder is propor-
tional to the amount of the turning on the steering wheel.
The steering wheel and steering control valve return to
the neutral position when turning is completed.
STEERING CYLINDER
PISTON MOVEMENT
STEERING CYLINDER
PISTON MOVEMENT
STEERING CYLINDER
NO PISTON MOVEMENT
1
800
1800
PSI
1800
PSI
PSI
STEERING
CONTROL
VALVE
STEERING
CONTROL
VALVE
STEERING
CONTROL
VALVE
NEUTRAL POSITION
LEFT TURN
RIGHT TURN
Figure 8
Hydraulic System
Page 9 -- 10
Workman HD Series
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Language | English |
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