784B and 785B Off-Highway Truck/Tractors Steering System Caterpillar


Pressure Switches

Usage:

784B 5RK



Illustration 1g00429838

Location of pressure switch for steering system

(1) Pressure switch for steering system

One pressure switch monitors the condition of the steering system.

Pressure switch (1) monitors the output of the steering pump. Pressure switch (1) is attached to a manifold that is mounted on the inside of the left frame. The actuation pressure of the pressure switch is approximately 12500 kPa (1813 psi). The deactuation pressure is approximately 10500 kPa (1523 psi) .

EMS

The Electronic Monitoring System (EMS) is designed in order to alert the operator of an immediate problem or impending problem in the steering system or other machine system.

The pressure switch is connected to the primary steering alert indicator. The primary steering alert indicator is located on the EMS panel. At start-up, the primary steering alert indicator should flash. The action alarm should sound and the EMS action light should come on. This will continue until the steering system pressure gets to approximately 12500 kPa (1813 psi). If the system pressure drops to approximately 10500 kPa (1523 psi) the action alarm and the EMS action light should come on and the primary steering alert indicator should flash.

If the primary steering alert indicator flashes and if the action alarm sounds and if the EMS action light comes on this is an indication of a loss of primary steering flow. The accumulators will provide enough flow in order to allow the operator to steer the machine to a safe location off the road.

Note: A warning is only displayed if the ground speed is above 8 km/h (5 mph) .

VIMS

The Vital Information Management System (VIMS) is designed in order to alert the operator of an immediate problem or impending problem in the steering system or other machine system.

The pressure switch is connected to the VIMS. At start-up, the alarm will sound and the alert indicator will flash until the steering pressure reaches approximately 12500 kPa (1813 psi). If the system pressure drops to approximately 10500 kPa (1523 psi) the alarm should sound and the alert indicator should flash.

If the alarm sounds and the alert indicator is flashing this is an indication of a loss of primary steering flow. The accumulators will provide enough flow in order to allow the operator to steer the machine to a safe location off the road.

Note: A warning is only displayed if the ground speed is above 8 km/h (5 mph) .

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