HANDLE 6I0325 - Caterpillar

Personal injury can result if the machine moves while testing.If the machine begins to move during test, reduce the engine speed immediately and engage the parking brake.
Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the brake system.
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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Specifications
Table 1
Service Brake Pressure Specifications
Date Equipment ID Code
Pump Pressure Setting Actual
Service Brake Valve(1) Fully Depressed 8790 350 kPa (1275 51 psi)
Fully Released 35 kPa (5 psi) Maximum
(1) Introduction
This information includes the following test:
Service Brake SystemThis information includes the following adjustment:
Service Brake SystemRequired Tools
Table 2
Required Tools
Tool Item Qty Part No Description
B B1 1 8T-0860 Pressure Gauge
B2 1 6V-3989 Fitting
B3 2 6V-4143 Quick Connect Coupler
B4 1 177-7862 Hose As Test Preparation
Position the machine on a dry, hard, level surface.
Be sure that the machine is in an open area and that the area is clear of personnel.
Place the steering frame lock in the LOCKED position.
Hydraulic oil should be at normal operating temperature 52.5° 7.5°C (126.5° 13.5°F)
Check hydraulic tank for correct oil level and maintain throughout the air removal procedure.Test Procedure
Stop the engine. Place the transmission in the NEUTRAL position.
Engage the parking brake.
Depress the brake pedal repeatedly to release all oil pressure from the brake circuit.
Illustration 1 g06084092
Brake control valve test port
(1) Service Brake Control Valve Test PortNote: The brake control valve and test port is on beneath the cab as shown in Illustration 1.
Remove the protective cap from test port (1) to test the oil pressure of the service brakes. Install a 0 to 15850 kPa (0 to 2300 psi) pressure gauge.
Look at the pressure gauge. Before you start the engine, the oil pressure must be at the pressure of the hydraulic oil tank.
Start the engine and allow the hydraulic oil to reach normal operating temperature and normal operation pressure.
Hold down the brake pedal and look at the pressure gauge. The brake pressure should be 8790 350 kPa (1275 51 psi) with the brake pedal depressed.
Release the brake pedal and look at the pressure gauge. The brake pressure should be a maximum of 35 kPa (5.1 psi) with the brake pedal depressed..
If the brake pressure is not in the correct range but the brake accumulator charging valve is functioning correctly, replace the brake control valve.