Sequence Valve

Introduction

This has been used with the current slurry door since early 1997 to reduce the number of hydraulic control pipes & to perevent the pushing & slurry door colliding.

The sequence – when the hydaulics are engaged to begin spreading, the side door will open & the slurry door will lift. When the slurry door has reached its full stroke the hydraulic pressure builds up in the line & opens one of the two valves in the sequence valve block allowing oil to flow to the pushing rams & therefore moving the pushing door forward.

When the machine has been emptied & the tractor hydraulics reversed, the ushing door will return to its original position at the back of the machine. The pressure again builds up in this cicuit & opens the second valve in the sequence block, allowing the oil to flow to the return side of the slurry door & side door rams. These will then close.

To adjust the Sequence Valve

Problem

Solution

Pushing door begins to move forward before the slurry door is fully raised

Turn sequence screw "A" (closest to the chassis of machine clockwise)

Slurry door opens but pushing door moves forward with difficulty or not at all

Turn sequence valve screw "A" anti-clockwise

Slurry door begins to close before pushing door has returned to back position

Turn sequence valve screw "B" (closest to the centre of the machine) clockwise

Pushing door returns fully but slurry door closes with difficulty, judders as it moves or does not move at all

Turn sequence valve screw "B" anti-clockwise

Use incremants of no more than 1/4 of adjustment screw until correct setting is found. All the above adjustments should be carried out while the machine is empty. If the adjustment fails to solve the particular problem then check the following:-

  1. Low input pressure.
  2. Faulty quick release couplings.
  3. Incorrect plumbing of system.
  4. Faulty flow valve.
  5. Dirt in the hydraulic system.
  6. Faulty sequence valve.

Transportation

For transportation the pushing door may require to be brought forward which will give better height clearance as the pushing door arm is now in the down position. To achieve this the following procedure is advised

  1. Connect hydraulics to the tractor.
  2. Operate spool valve until slurry door lifts to fully open position & the pushing door moves three quaters of the way forward in the body.
  3. Put spool valve into neutral.
  4. Turn sequence valve "B" (closest to the centre of the machine) fully anti- clockwise – remembering exactly the number of rotations the valve is rotated.
  5. Operate the spool valve in the opposition direction – this allows the slurry down to close and giving adequate height clearance.
  6. Disconnect hydraulics and rotate the sequence valve "B" clockwise (back the counted number of times) – this returns the sequence valve to the normal operation so that the next time it is operated it will have the correct sequence.

Remember to ask the customer to return the pushing door back to fully returned position after transportation

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