Bleed Depth Control Hydraulic System

1. Avoid hazards due to escaping fluid under pressure. See AVOID HIGH PRESSURE FLUIDS in this manual.

   Ensure that cylinders are supported firmly with a wood block or wire before bleeding cylinders. Wire (A) could also be used to retain wheel module cylinders. Failure to do so can result in cylinder falling and causing serious injury to you or others.

   Bleed rate times are calculated using a flow rate of 113 Lpm (30 gal/min) per minute. If performing bleed procedure using a tractor with less hydraulic flow, bleed times MUST be adjusted. Example: If tractor hydraulic pump is running at 57 Lpm (15 gal/min), then double all bleed times.

   Follow bleed procedure EXACTLY as shown. Hydraulic reservoir MUST be filled before bleeding and kept FULL throughout entire bleed procedure.

   
   X9811-UN-23AUG88

   
   N37063-UN-06OCT88

   
   N89646-UN-09NOV10

   A - Wire

   Verify that tractor is full of hydraulic oil.

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2. Unfold machine and lower to ground.

3. Remove pins from the rod end (if installed). Make sure that cylinders are properly supported and do not contact other objects during extension.

4. 
   N95953-UN-13DEC11

   A - Stop Bracket

   B - Valve Plunger

   Back off the Single Point Depth Control stop bracket (A) so it does not contact valve plunger (B).

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5. Run tractor to 1800 rpm.

6. Fully extend and retract all cylinders at least two times, maintaining hydraulic pressure at full extension for at least 30 seconds.

7. If an oil leak is found during bleed procedure, stop oil leak then restart procedure.

   Extend cylinders and keep in continuous flow for 2 minutes.