GLOW PLUG GROUP 4M8074 - Caterpillar

Illustration 1 g06135603
(1) Low oil pressure switch for the steering pumpOne pressure switch monitors the condition of the steering system.Oil pressure switch (1) monitors the output of the steering piston pump. Oil pressure switch (1) is attached to the steering check and relief valve that is on the frame behind the right front suspension cylinder and underneath the steering hydraulic tank.The Caterpillar Monitoring System is designed to alert the operator of an immediate problem in the steering system or in other machine systems. The monitoring system also alerts the operator about an impending problem in the steering system or other machine systems.The oil pressure switch is connected to the monitoring system. The alarm will sound and the action light and alert indicator for the secondary steering system will flash until the steering pressure reaches the de-actuation pressure. If the system pressure drops to the actuation pressure, the alarm should sound and the action light should flash.The oil pressure switch (1) is also connected to the Power Train Electronic Control Module (Power Train ECM). If the system pressure is below the deactuation pressure, the Power Train ECM will energize the secondary steering relay that is located behind the cab. The secondary steering relay behind the cab will then energize a second larger relay that is on the frame near the front left suspension cylinder. The larger relay will activate the brake release and secondary steering pump. The brake release and secondary steering pump will send oil to the steering check and relief valve.If the alarm sounds and the alert indicator is flashing, this alarm is an indication of a loss of primary steering flow. The brake release and secondary steering pump will provide enough flow to allow the operator to steer the machine to a safe location off the road.Note: A warning is displayed only if the ground speed is above 8 km/h (5 mph).