TM
Model 4900M0247-01
Rev. 10/17 3-21
Row Unit Operation
GFX HYDRAULIC ROW CLEANERS
Run the minimum flow rate necessary. Generally this is a setting of .5-.7 with maximum
ever being used being about 1.5. This is on a scale of 1-10, most tractors will be using
less than 10% of available flow. Any additional flow will simply waste power and also
increase stress and temperature on control manifold, valves and also the tractor oil
temperature.
BLEEDING HYDRAULIC CIRCUIT AND INITIAL OPERATION
Gfx hydraulic row cleaners were designed to bleed the hydraulic circuit by purging
air out of system from either end of tool bar. In practice it will be virtually impossible
to completely bleed system in the shop. A certain amount of air will need to work
itself out over time. To sufficiently bleed the system use the following procedure.
1. Make sure that pressure setting in system is set to it’s minimum by moving pressure control knob on control box
counter-clockwise until it stops, or in the (0) setting. A minimum amount of pressure should be running during
bleeding process.
2. Using the " cap nut at each end of the tool bar, open BOTH ends slightly at this time.
3. Keep knob on Dawn digital control box at zero and tune the tractors SCV hydraulic control to 1-2 GPM (gallons
per minute) or at about 5% of maximum flow.
4. Gradually increase pressure setting on electronic control knob until a slow steady stream of fluid is flowing from
bleed adapters. There should be surging coming out of bleed adapters at this point. Continue the bleed process
until surging stops and clean fluid begins coming out.
5. When clean hydraulic fluid flows freely from bleed adapter, close bleed valves. Cycle circuit a few times using
digital control knob, then re-open " cap nuts to release air bubbles.
Pressurized hydraulic fluid can penetrate
body tissue and result in death, serious
infection, or other injuries. Fluid injected
under skin must be IMMEDIATELY
removed by a surgeon familiar with this
type of injury. Make sure connections
are tight and hoses and fittings are
not damaged before applying system
pressure. Leaks can be invisible. Keep
away from suspected leaks. Relieve
pressure before searching for leaks or
performing any system maintenance.
WARNING
START UP
1. Turn on SCV to hydraulic row cleaner.
2. Turn row cleaner adjustment dial to zero, and then turn on electrical switch on side of control box.
3. Adjust dial on control box to achieve desired down force; clockwise to increase, counter-clockwise to decrease.
4. To operate turn control knob and apply as much pressure as necessary to achieve desired level of row cleaning.
SHUT DOWN
1. Turn row cleaner adjustment dial to zero.
2. Always turn electrical power switch on side of control box to off position before turning off tractor hydraulic SCV.
NOTE: Failure to follow this order will trap pressure in the row cleaner hydraulic accumulators.
3. Turn off tractor SCV.
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