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Inspections of Aerial Equipment - page 10 / 10

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Presentations from the 12th Equipment Management Workshop

91

OPERATIONS CHECK AND HOLDING VALVE TEST:

The truck should still be running with the PTO engaged.

  • 1.

    Remove the boom/platform tie-down device(s).

  • 2.

    Engage axle locks and counterweight (red axle lock engaged indicator light).

  • 3.

    Place the unit/axle lock selector valve in the “UNIT” position (PULL OUT).

  • 4.

    Close B-2 and B-3. If you don’t close B-2 and B-3, these booms may open when you raise B-1.

  • 5.

    Raise B-1, one foot above the boom rests.

  • 6.

    Lower the platform rests to the deck.

  • 7.

    Lower B-4 approximately 45 degrees (if installed).

  • 8.

    Place the unit/axle lock selector valve in the “AXLE LOCK” position (PUSH IN).

  • 9.

    Now, perform the holding valve test. Watch for drift.

    • Operate B-1 to the “DOWN” position for 5 seconds.*

    • Operate B-2 to the “OPEN” position for 5 seconds.*

    • Operate B-3 to the “OPEN” position for 5 seconds.*

    • Operate B-4 to the “DOWN” position for 5 seconds.*

  • 10.

    Test the hydraulic air compressor and generator (shut them down when test completed).

  • 11.

    Test the T-1 intercom.

  • 12.

    Raise the platform rests and lock them into place.

  • 13.

    Test the truck engine start/stop system at the platform (red button). Leave truck engine off.

  • 14.

    Test the platform intercom.

  • 15.

    Start the auxiliary engine.

  • 16.

    Use the auxiliary engine to stow the unit; this will test the auxiliary engine.

  • 17.

    Place the unit/axle lock selector valve in the “UNIT” position (PULL OUT).

  • 18.

    Raise B-4 (if installed).

  • 19.

    Lower B-1 tightly into the rests (about 900 psi on the hydraulic gauge at T-1).

  • 20.

    Place the unit/axle lock selector valve in the “AXLE LOCK” position (PUSH IN).

  • 21.

    Disengage the axle locks and counterweight (green axle lock disengaged indicator light).

  • 22.

    Install the boom / platform tie-down device.

  • 23.

    Shut down the auxiliary engine.

____________

  • *

    If any one of the booms moves (drifts) during the holding valve test, perform the test

again in order to verify which boom is drifting. The problem holding valve(s) must be replaced before the unit is put into service.

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