CHECK VALVE GROUP 9J5723 - Caterpillar

Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.Always use a board or cardboard when checking for a leak.
Personal injury or death can result if two persons are not used in the following procedure.
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
966M and 972M Service Brake Pressure    
Pump Pressure     Setting     Actual    
Front Service Brake     5510 170 kPa (800 25 psi)        
Rear Service Brake    
5407 207 kPa (784 30 psi)        Introduction
This information includes the following test:
Service Brake SystemThis information includes the following adjustment:
Service Brake SystemRequired Tools
Table 2
Required Tools    
Part Number     Description    
8T-0858     Pressure Gauge (0 TO 16,000-KPA (0 TO 2,300-PSI))    Test Preparation
Illustration 1 g03116679
Steering frame in locked position
Move steering frame lock to the LOCKED position.Test Procedure
Stop the engine. Place the transmission direction selector in the NEUTRAL position.
Engage the parking brake.
Depress the brake pedal repeatedly in order to release all oil pressure from the brake circuit.
Illustration 2 g03116818
Location of Brake Control Valve on left side of machine under the cab.
Illustration 3 g03116876
Brake Control Valve (1) Test port for Front Service Brakes (2) Test port for Rear Service Brakes
Remove the protective cap from test port (2) in order to test the oil pressure of the rear service brakes. Install a 0 to 16000 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 operating pressure.
Hold down the brake pedal and look at the pressure gauge. The rear brake pressure should match the figure displayed in Table 1.
If the brake pressure is not in the correct range but the brake accumulator charging valve is functioning correctly, replace the brake control valve.
Repeat this procedure at test port (1) in order to test the oil pressure of the front service brakes.