GASKET KIT 1458733 - Caterpillar

Illustration 1 g00104946
(1) Location of alert indicator for brake air pressure. (2) Two air pressure gauges.
Illustration 2 g00104949
(3) Service brake control valve.
Illustration 3 g00104950
View A-A (3) Service brake control valve. (4) Low brake air pressure switch. (5) Low brake air pressure switch. (6) Stop lights air pressure switch.The Electronic Monitoring System (EMS) consists of an action alarm, action light and a monitoring panel with individual alert indicators for each machine system. The EMS provides three warning categories. The first warning category requires only operator awareness. The second warning category needs operator response. The third warning category requires immediate shutdown of the machine systems.The alert indicator (1) for brake air pressure is a Warning Category 3. A low brake air pressure switch (4) is located on one side of the service brake control valve. The other low brake air pressure switch (5) is located on the other side of the service brake control valve. These switches are connected to the EMS control. The electronic circuits within the EMS control make all EMS decisions. The EMS control activates the action alarm, the action light and the alert indicator for the brake air pressure. If either circuit of the air system fails, the appropriate low brake air pressure switch will open at approximately 530 kPa (77 psi). This opens the circuit in order to signal the EMS control. This is a Warning Category 3. This indicates low air pressure to the brakes. The operator must stop the machine immediately. Engage the parking brake and stop the engine. The operator can look at the air pressure gauges (2) on the instrument panel in order to determine the circuit that has failed. Do not operate the machine until the cause has been corrected.Note: The action alarm is located in the console to the right of the operator's seat.The last circuit is for the stop lights. Stop lights air pressure switch (6) is in the air line that runs from the service brake control valve to the brakes. When the service brake control (pedal) is depressed, the stop lights air pressure switch closes. This completes a circuit in order to operate the stop lights.Each circuit is connected to the battery through a separate fuse in the fuse box.For further information, refer to the appropriate Operation and Maintenance Manual and the Service Manual, SENR2945, "Electronic Monitoring System (EMS)".