770G and 772G Off-Highway Truck Hydraulic and Braking System: Electronic Control Module (Brake) & Hydraulic Tank (Brake, Brake Cooling, Hoist)

1.-Electronic Control Module (Brake)

View of the location of the Brake Electronic Control Module ( Brake ECM)(1) Brake ECM

Brake Electronic Control Module (Brake ECM)

The Brake Electronic Control Module (Brake ECM) is located at the front of the cab under the dashboard. The Brake Electronic Control Module (Brake ECM) is the main component in the brake electrical system. The Brake ECM controls the Automatic Retarder Control (ARC) and the Traction Control System (TCS) functions. The Brake ECM has several input signals and output signals. The Brake ECM receives information from various input components. The Brake ECM uses this information in order to determine if the service and retarder brakes should engage for the ARC or the parking and secondary brakes for the TCS. The output components are then activated in order to apply the ARC or the TCS. The inputs and outputs of the Brake ECM are connected to the machine harness.

For more information about the ARC or TCS systems, refer to Systems Operation, "Brake Valve (Rear Service Brake, Retarder Control, Traction Control)" in this Service Manual.

The CAT Data Link is used to communicate with the other electronic control modules on the machine. The CAT Data Link is bidirectional. A bidirectional Data Link allows the Brake ECM to receive information and send information. The CAT Data Link allows the sharing of information with other electronic controls. The Cat Data Link is used to share information with the following systems:

• Engine Electronic Control Module
• Power Train Electronic Control Module
• Road Analysis Electronic Control Module
• Vital Information Management System

2.-Hydraulic Tank (Brake, Brake Cooling, Hoist)

View of Hydraulic Tank (Brake, Brake Cooling, Hoist) from rear of truck (1) Hydraulic Tank (Brake, Brake Cooling, Hoist) (2) Breather port (3) Remote sight gauge port (4) Remote hydraulic tank oil fill tube (5) Oil level sensor port (6) Remote sight gauge port (7) Brake cooling return port (8) Return port for the Control Valve (Hoist) relief (9) Return port for the Brake Valve (Rear Service Brake, Retarder Control, Traction Control) (10) Suction port for the parking brake release section of the Pump and Motor (Parking Brake Release, Secondary Steering)(11) Suction port for the Gear Pump (Hoist)

Hydraulic Tank (Brake, Brake Cooling, Hoist) (1) is mounted on the frame directly behind the cab. Hydraulic Tank (Brake, Brake Cooling, Hoist) (1) supplies oil to the brakes, to the brake cooling system, and to the hoist hydraulics. Hydraulic tank oil fill tube (4) and remote sight gauge port (3) are located on the right side of Hydraulic Tank (Brake, Brake Cooling, Hoist) (1). Breather port (2) is located on top of the tank. Breather port (2) is connected to a breather which is mounted to the steering oil tank.

The Gear Pump (Hoist) pulls oil from Hydraulic Tank (Brake, Brake Cooling, Hoist) (1) through a suction screen and through suction port for the Gear Pump (Hoist) (11). Suction port for the Gear Pump (Hoist) (11) is located on the side of the tank which faces toward the rear of the truck. Oil returns from the Control Valve (Hoist) through the return port for the Control Valve (Hoist) relief (8).

View A-A (12) Remote drain port (13) Suction port for the Gear Pump (Brake, Brake Cooling)(14) Return port for the Control Manifold (Brake Accumulator Charge) and the Brake Valve (Front Service Brake)

The Gear Pump (Brake, Brake Cooling) pulls oil from Hydraulic Tank (Brake, Brake Cooling, Hoist) (1) through a suction screen and through suction port for Gear Pump (Brake, Brake Cooling) (13). Brake cooling oil returns to the hydraulic tank through brake cooling return port (7). Brake oil also returns to the hydraulic tank through return port for the Control Manifold (Brake Accumulator Charge) and the Brake Valve (Front Service Brake) (14).

View of remote sight gauges from front of truck (4) Remote hydraulic tank oil fill tube (15) Upper remote sight gauge(16) Lower remote sight gauge

Hydraulic Tank (Brake, Brake Cooling, Hoist) (1) has two remote sight gauges. Upper remote sight gauge (15) is used for checking the oil level when the truck body is down. The oil level should first be checked with cold oil and the engine stopped. The level should again be checked with warm oil and the engine running. Lower remote sight gauge (16) can be used when the hoist cylinders are in the RAISED position. When the hoist cylinders are lowered, the hydraulic oil level will increase. After the hoist cylinders are lowered, check the hydraulic tank oil level with upper remote sight gauge (15) as explained above. See the Operation and Maintenance Manual for the lubrication viscosity and for the refill capacity of Hydraulic Tank (Brake, Brake Cooling, Hoist) (1).

If you need more information, You can visit:

http://www.cat.com

770G and 772G Off-Highway Truck Hydraulic and Braking System: Electronic Control Module (Brake) & Hydraulic Tank (Brake, Brake Cooling, Hoist) 2012-12-26T20:05:00-08:00 Rating: 4.5 Diposkan Oleh: Unknown