Great Plains NTA3007 Operator Manual - Manual (Page 136)

132 NTA907 or NTA3007 Table of Contents Index Great Plains Manufacturing, Inc.
166-371M Table of Contents Index 2012-07-02
In-Line Filter
If the raising or lowering times of the openers slow
noticeably, check the in-line filter and clean if needed.
The filter is located at the inlet port of the down-pressure
valve block (page 101).
1. Unfold drill (page 34). Lower openers (page 42) as if
for planting (down-pressure active).
2. Record the current bar or psi readings on the
down-pressure and weight-transfer gauges.
3. Set lift circuit to Float.
4. Completely close the Centre, Wing and Transfer
valves to minimize fluid loss. The Bypass valve may
be left as-is.
5. Shut down tractor and remove key.
Refer to Figure 130
6.
Slowly loosen filter and relieve any residual pressure
in line. When disconnecting hose, support the end to
minimize fluid loss.
7. To disassemble unscrew end cap of filter. Remove
top retaining washer and screen.
8. Clean filter screen with solvent and compressed air,
or replace if needed.
9. When reassembling put screen into filter. Place
retaining washer on top of filter and screw on end
cap.
10. Re-install filter.
11. Actuate the lift circuit for down-pressure. Cycle the
lift system several times. Check for leaks.
12. Restore the Centre, Wing and Transfer valves to their
former settings.
13. Cycle the lift system several times. If there is any
sign of air in the system, perform a bleed operation
(page 131).
Figure 130
In-Line Filter
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