CONTROL GP-ELECTRONIC 1020690 - Caterpillar

Illustration 1 g00718645
The metering pump (steering) is located at the base of the steering column.
Illustration 2 g00718802
Metering pump (steering) (1) Left steer port (2) Right steer port (3) Tank port (4) Pump port (inlet) (5) Control section (6) Drive pin (7) Drive shaft (8) Spool (9) Sleeve (10) Housing (11) Metering section (12) Check valve (13) Check valve (14) Load sensing port (15) Pilot pressure port
Illustration 3 g00718865
Metering section (6) Drive pin (7) Drive shaft (16) Rotor ring (17) RotorControl section (5) consists of spool (8), sleeve (9) and housing (10). The sleeve is connected to the spool by drive pin (6). Drive pin (6) is installed through a slot in the spool. Drive pin (6) is installed through a hole in the sleeve.Metering section (11) consists of rotor ring (16) and rotor (17). The spool is connected to the rotor by drive shaft (7). Drive shaft (7) has a slot that engages with drive pin (6). Drive shaft (7) is splined to the rotor of the metering section.The steering column is connected to the spool by a spline coupling.Oil from the steering pump flows into the control section through inlet port (4). When the steering wheel is not being turned, the flow is blocked by the spool.When the steering wheel is turned, spool (8) turns and spool (8) starts to compress the centering spring. The centering spring is not shown in illustration 2. When the drive pin contacts the ends of the slots in the spool, the sleeve also turns. As the steering wheel is turning, the spool and the sleeve turn as a unit and the centering spring is compressed.The initial movement of the spool opens passages between the control section and the metering section. This allows inlet oil to flow from port (4) to the metering section.Steering wheel rotation turns rotor (17) inside rotor ring (16). As the rotor turns, a metered flow of oil from the steering pump is sent back through the housing. The oil flows to the right turn port or the oil flows to the left turn port. This depends on the direction of rotation. The oil then flows to the steering cylinders.When the speed of the rotation of the steering is increased, the oil flow rate to the steering cylinders is increased. Additional oil flow bypasses the metering section and flows directly from the control section to left steer port (1) or to right steer port (2) .The metering pump (steering) allows the number of turns (stop to stop) of the steering wheel to vary depending on the speed of the steering wheel. As the steering wheel is turned slowly, 7 to 8 turns of the steering wheel are required in order to fully articulate the machine. As the steering wheel is turned quickly, 4 to 5 turns of the steering wheel are required in order to fully articulate the machine.This feature