GASKET KIT 6V6376 - Caterpillar

There are purge valves for the hydraulic brakes on each wheel. Before you use the purge valves to remove air from the oil in the system, the makeup oil tank for the hydraulic brakes must be full. Also, the air system pressure must be more than 550 kPa (80 psi).
Personal injury or death can result from air in the oil for the brake hydraulic system.Air in the system can prevent complete brake application and it is possible that the wheels on the machine can not be stopped.Air must not be in the oil for the brake hydraulic system to function properly.
Personal injury or death can result from machine movement.Place blocks in front of and behind the wheels to make sure the machine does not move while the parking brakes are disengaged.
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.
Note: Purge only one wheel at a time.Service Brakes and Retarder
Rear Brakes
Use a 6V-4055 Pressure Hose Assembly and two 6V-4143 Coupler Assemblies to construct a jumper hose.
Apply the parking brake. This will release the pressure in the lines.
Illustration 1 g00540358
(1) Pressure tap on the rear slack adjuster
(2) Pressure tap for parking brake release pressure
Put one end of the jumper hose on pressure tap (1).
Put the other end of the jumper hose on a pressure tap (2).
Illustration 2 g00540799
(P) Purge valve for the parking brake
(S) Purge valve for the service brake Note: Identification letters are embossed on the purge valves at the top of the brake housing. The purge valve for the parking brake is labelled with a "P". The purge valve for the service brake is labelled with an "S".
Connect a drain hose from the "S" port to the hydraulic tank or to a suitable container.
Run the engine at low idle. Move the parking brake lever to the OFF position.
Pull down the retarder control.
Open the purge valve "S" on a rear wheel brake housing and purge the brake system. Leave the purge valve open until there is a constant flow of oil.
Close the purge valve. Repeat Step 8 for the other rear wheel brake.
Close the purge valve. Move the retarder control to the OFF position. Activate the parking brake in order to release the pressure. Remove the jumper hose. Note: In order to verify that all of the air was removed from the service brake lines for the rear brakes, perform the following steps.Note: In order to make sure that the makeup oil tank is full, operate the engine at high idle for 20 seconds before each brake application.Note: Make sure that the parking brake reset valve is depressed.
Move the parking brake lever to the OFF position in