Pneumatic Down Force (8 and 12 Row Machines)

1. CAUTION: Avoid serious injury from exploding parts due to overpressurization or operating the system without all components in place.

   • Do not inflate system above 827 kPa (8.2 bar) (120 psi).
   • Do not remove pressure relief valve.
   • Do not pressurize system unless all row unit components are in place.
   
   

   IMPORTANT: Do not lower machine with zero air pressure in system. Maintain 34 kPa to 55 kPa (0.3 bar to 0.5 bar) (5 psi to 8 psi) in system or air springs can kink. If air spring kinks, raise machine and pressurize the system until air springs straighten out.

   IMPORTANT: Do not operate if a pinched or unrolled air spring occurs. Lower system pressure until air springs can be rolled by hand. Roll air spring back over lower piston. Incremental lowering of machine is required to start air spring rolling over lower piston.

   NOTE: It is normal for system air pressure to drop when frame is raised and increase when frame is lowered.

   NOTE: Some additional down force on row units that follow in tractor tire tracks can be required. An extra single down force spring can be installed on these row units, without affecting other row units.

   
   A48706-UN-15FEB02

   Properly Rolled Air Spring

   
   A48850-UN-01MAR02

   Improperly Rolled Air Spring

   
   A67515-UN-25MAY10

   A - Valve Stem

   With machine in planting position, apply shop air to valve stem (A) to preset down force to desired setting.

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2. 
   A67516-UN-25MAY10

   
   A48647-19-20FEB02

   A - Valve

   B - Toggle Switch

   C - T-fitting

   D - Valve

   E - Fitting

   If equipped with split rows, attach hose with white mark to fitting (B). Attach hose without white mark, for primary rows, to T-fitting (C).

   Pneumatic Down Force Valve Settings
   	Rotate Valve (A)	Rotate Valve (D)
   Pressurize	Counter Clockwise
   Depressurize	Clockwise
   Pressurize (Split Rows)	Counter Clockwise	Counter Clockwise
   Depressurize (Split Rows)	Clockwise	Clockwise

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3. NOTE: Power to compressor is linked to tractor ignition switch. Compressor cannot run when ignition switch is in “off” position.

   To increase system down force, turn compressor on using toggle switch (E) and open appropriate valves as described in preceding table. When desired setting is reached, turn off compressor.

4. Pressure drop in excess of 83 kPa (0.8 bar) (12 psi) in 10 hours is considered excessive and could indicate a fitting leak.

   NOTE: Spray soapy water on fittings. Bubbles appear when air is leaking.

   For excessive pressure drops, check all connections with soapy water in the following order:

   1. Threaded Compressor Fittings—If leaking, tighten, or tape threads with thread tape and install fittings.

   2. Hose Compression Fittings—If leaking, push hose completely into coupler.

      If leak persists, first relieve system pressure, then simultaneously push in compression ring and gently pull air line out of fitting. Cut hose tip off squarely, clean, and reinstall hose in coupler.

   3. Swivel Tee or Elbow fitting on top of air spring—If leaking, first relieve system pressure, then remove fitting. Check O-ring and seal surfaces for damage. Clean seal surfaces and reinstall fitting.