SLEEVE-FLINGER 5103685 - Caterpillar

Steering Control
The steering assembly consists of two hydraulic cylinders, a hydraulic control valve and two interconnected control levers. The control levers, one at each end of the control panel, set the position of a spool in the control valve located under the console. The position of the valve spool determines whether control system hydraulic pressure is blocked at the valve or routed to one or the other end of each of the steering cylinders. When either control lever is moved to "L" (left), control pressure is applied to the head end of the right cylinder, extending the cylinder rod, and to the rod end of the left cylinder, retracting the cylinder rod. The combined action of the two cylinders turn the front leg assembly and the attached track to the left. Moving either control lever to "R" (right) applies control pressure to the rod end of the right cylinder and to the head end of the left cylinder. The front track can be turned 60 degrees each side of center.Elevation Control
System Description
The elevation of the mainframe and the attached cutter can be controlled manually or automatically. When using manual control, the operator manually positions a control valve to adjust the elevation of each of the three legs.
PR-750B ELEVATION CONTROL SYSTEMWhen automatic control is used, the elevation of the front leg is controlled by an elevation sensor mounted on the left side of the machine. The elevation of the rear legs is controlled by an elevation sensor or by the cross slope sensor, or either rear leg can be manually adjusted to a set elevation above the cut grade (locked to grade) at which the leg will remain. See page 2-34 for more information on the possible modes of elevation control.Elevation Sensors
Each elevation sensor consists of a patented hydraulic valve, a wand and a counterweight arm. The counterweight position is adjustable to ensure that the wand will ride firmly against the wand guide. Any change of machine elevation in relation to the wand guide will cause the wand and counterweight arm to rotate the shaft in the hydraulic valve. The rotation of the valve shaft opens a valve port which allows the pressurized hydraulic oil to flow to the end of the hydraulic cylinder that will bring the machine back into proper relation with the wand guide. As the machine moves back to its proper position, the wand and counterweight arm rotate in the opposite direction, closing the valve port and stopping the movement of the hydraulic cylinder.When the sensor is in the null position (there is no hydraulic flow at the C1 and C2 ports) the counterweight arm should be 90° to the valve body centerline and the wand should be in line with the counterweight arm.Cross Slope Sensor
The cross slope sensor (pendulum assembly) is a pendulum-type hydraulic sensor that senses any change in machine cross slope from that entered in the system. If the cross slope sensor detects a change in the machine cross slope, the sensor