AD30 Underground Articulated Truck Braking System System Pressure - Release Caterpillar


System Pressure - Release
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Table 1
Required Tools    
Part Number     Part Description     Qty    
177-7861     Hose As     1    
6V-4143     Coupler     2    
8T-0851     Pressure Gauge (0 to 16,000 kPa (0 to 2,300 psi))     1    

This procedure should be followed when the technician is removing a hydraulic line or a hydraulic component.

------ WARNING! ------

Personal injury or death can result from escaping fluid under pressure.

Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated by a doctor familiar with this type of injury.

Always use a board or cardboard when checking for a leak.

----------------------


NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Refer to Special Publication, NENG2500, "AVSpare Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on AVSpare products.

Dispose of all fluids according to local regulations and mandates.


  1. Engage the parking brake. Stop the engine.



    Illustration 1g00882562

    Location of the service brake pedal

    (1) Service brake pedal

  1. Depress service brake pedal (1) at least 70 times to remove the oil pressure from the brake accumulators.



    Illustration 2g00994948

    Location of the brake accumulator pressure taps

    (2) Rear brake accumulator pressure tap

    (3) Front brake accumulator pressure tap

  1. Remove the protective cover from pressure tap (2) . Connect a hose assembly with an 8T-0851 Pressure Gauge [0 to 15850 kPa (0 to 2300 psi)] to pressure tap (2) . Check the reading on the pressure gauge.

  1. If the reading on the pressure gauge is not 0 kPa (0 psi), repeat Step 2.

  1. Remove the protective cover from pressure tap (3) . Connect a hose assembly with an 8T-0851 Pressure Gauge [0 to 15850 kPa (0 to 2300 psi)] to pressure tap (3) . Check the reading on the pressure gauge.

  1. If the reading on the pressure gauge is not 0 kPa (0 psi), repeat Step 2.

  1. Remove the test equipment. Place the protective covers on the pressure taps.

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