HARRISTON INDUSTRIES 93066, Руководство оператора

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4.6 HARRISTON HYDRAULIC
CONTROL SYSTEM
The hydraulic drive planter is a single series
hydraulic system controlled by an electronic
pulse width modulated (PWM) control
valve. Hydraulic oil flow and pressure is
supplied by the tractor. This valve controls
how fast the clamp wheels turn, which in
turn, determines seed spacing. The system
can be operated with an open or closed
tractor hydraulic system.
4.6.1 PRESSURE-FLOW
COMPENSATED SYSTEM
Most new tractors use a pressure flow
compensated hydraulic system. Flow is
adjusted with the tractor flow control. It is
recommended that flow be set to deliver
only the gallons per minute (g.p.m.) required
to operate the planter at the desired rate and
speed, usually 10 g.p.m. is sufficient. Excess
flow could damage the planter control
system. When planting, the pressure will be
the tractor operating system pressure
(usually 3000 p.s.i.) plus the pressure
required to operate the planter. This varies
greatly depending on planter size and
configuration.
These systems have a very high flow, some
in excess of 40 g.p.m. To reduce overheating
and possible damage to planter hydraulic
system, set the flow to deliver only the
g.p.m. to operate the planter. Some
compensated hydraulic systems have a
pressure-sensing line available as an option.
Consult your tractor dealer about this option.
When the planter is not moving, or operating
in manual mode, there will be flow and
pressure from the tractor (A), but no flow or
pressure after the PWM valve (B). When the
planter begins to move, (or if you run the
planter manually with the radar override),
the control console receives a signal from
the radar and begins to open the valve. Oil
will begin to flow from Port 3 of the valve to
the clamp wheel hydraulic motor (C). As the
hydraulic motor begins to turn, oil will flow
from the motor to the feedbox flow control
(D) and on to the feedbox motors (E). Oil
returns to the tractor after it flows through
the feedbox motors (F). If you have a
fertilizer attachment, oil flows from the
bypass outlet on the PWM valve for the
clamp wheel motor to the PWM valve for
the fertilizer attachment (G). It then flows to
the fertilizer hydraulic motor (H) & back to
the return line to the tractor (F). See Page 24
for more information on motor solenoids /
oil flow.
If the feed box motor solenoid is open
(potatoes in top height range of sensor), oil
will bypass the feedbox motors in the valve
block below the solenoid and continue to the
other feedbox motors. If the feed box motor
solenoid is closed (no potatoes in low height
range of sensor), oil will flow through and
turn the motor. Any motor that has a closed
solenoid will turn as long as the main drive
motor is turning. Set the flow control on #2
or #3 when starting. See Page 35 for setting
bowl seed level.
Flow or Gallons Per Minute (G.P.M) is
regulated by the tractor flow control. Flow
should be set so that sufficient flow is
provided to operate planter at the desired
planting speed. Usually this will be 12
g.p.m or less. Flow should never be above
12 g.p.m. A check valve is located after the
hydraulic tip on the tractor return line to
prevent the planter from running in reverse.