KIT-BRAKE 3866608 - Caterpillar

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, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Complete the procedure in the Service Manual module Testing and Adjusting, "Machine Preparation for Troubleshooting" prior to testing the machine."Procedure 1" is a quick method for checking the cutout pressure. This procedure also indicates whether the oil pressure switch for the service brakes and the brake oil pressure indicator operate correctly. The procedure provides an estimate of the accumulator precharge pressure and an estimate of the number of brake applications before the brake oil pressure indicator turns on."Procedure 2" determines whether the cut-in pressure and the cutout pressure are correct. This procedure also provides the required steps for adjusting the brake accumulator charging valve.Procedure 1
Stop the engine. Engage the parking brake. Depress the brake pedal repeatedly until there is no brake oil pressure. This will require more than eleven applications of the service brakes.
Illustration 1 g00880945
Illustration 2 g00880833
(1) Brake accumulator charging valve (2) Service brake pressure switch (3) Pressure test port (4) Cover for the adjustment screwNote: The brake accumulator charging valve is located behind the cab in the compartment for the brake components.
Connect a 0 to 20700 kPa (0 to 3000 psi) pressure gauge at pressure test port (3) on brake accumulator charging valve (1) .
Observe the pressure gauge. Before you start the engine, the oil pressure must be 0 kPa (0 psi).
Start the engine. Allow the oil pressure to increase to the cutout pressure. The correct cutout pressure should be 14485 345 kPa (2100 50 psi).
After the brake accumulators have been completely charged and the correct cutout pressure has been obtained, stop the engine.
Turn the engine key start switch to the ON position, but do not start the engine.
Apply the service brakes repeatedly. Pause for two seconds before each brake application and count the number of applications while you observe the pressure gauge.
Illustration 3 g01310367
Alert Indicator Panel (5) Brake oil pressure indicator.
When the reading on the pressure gauge decreases to 8960 345 kPa (1300 50 psi), brake oil pressure indicator (5) will turn ON. This indicates the operational status of brake oil pressure indicator. This also indicates the operational status of brake oil pressure switch (4) for the service brakes. The brake oil pressure switch is located on accumulator charging valve (1) .
Continue to apply the service brakes, pausing for a second or two before each brake application. When the pressure drops off rapidly, this indicates the approximate nitrogen precharge pressure in the brake accumulators.
Determine the number of brake applications that were required before the brake oil pressure indicator turns on in Step 8. This count should be approximately eleven times for brakes that