HOSE 2647811 - Caterpillar

Table 1
Tools Needed    
Part Number     Part Description     Qty    
177-7862     Hose As     1    
6V-4143     Coupler     2    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, "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.
Note: Purge only one wheel at a time.Service Brakes and Retarder
Use a 177-7862 Hose As and two 6V-4143 Coupler Assemblies to construct a bypass hose.
Apply the parking brake. This will release the pressure in the lines.
Illustration 1 g00297437
(1) Pressure tap on the rear slack adjuster (2) Pressure tap for parking brake release pressure
Put one end of the bypass hose on the pressure tap for the slack adjuster. Use the pressure tap on the rear slack adjuster (1) for both rear wheels. Use the pressure tap on the front slack adjuster for both front wheels.
Put the other end of the bypass hose on a pressure tap for parking brake release pressure (2) .
Illustration 2 g00282133
(P) Purge valve for the parking brake (S) Purge valve for the service brakeNote: 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 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. 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, perform the