CYLINDER GP-LIFT 4Z6390 - Caterpillar

Without Service Brake Pressure Gauges
Table 1
Required Tools    
Part Number     Part Description     Qty    
177-7861     Hose As     1    
6V-4143     Couplers     2    
8T-0857     Pressure Gauge     1    
5I-3190     Fitting     1    
2R-6806     Connector     1    
6V-3965     Fitting As     1    
3J-1907     O-Ring Seal     2    Front Axle Service Brakes
Move the machine to a hard, level surface.
Engage the parking brake and stop the engine.
Install the steering frame lock.
Release the braking system oil pressure.Reference: Refer to Systems Operation, Testing and Adjusting, "System Pressure - Release" for the machine that is being serviced.
Illustration 2 g00944873
(3) Service brake hose assembly for the front axle (test fitting installed)
Install a 5I-3190 Fitting, 2R-6806 Connector and 6V-3965 Fitting As into service brake hose assembly (3) .
Connect a 177-7861 Hose As and an 8T-0857 Pressure Gauge to the 6V-3965 Fitting As .
Purge the air from the braking system.Reference: Refer to Systems Operation, Testing and Adjusting, "Braking System Air - Purge" for the machine that is being serviced.
Start the engine and allow the hydraulic oil to reach normal operating temperature.
With the brake accumulator charging valve oil pressure operating between the cut-in and cut-out pressures, depress and hold down the service brake pedal. Observe