PINION 0827394 - Caterpillar

If the steering control unit drive is not timed correctly, the machine can turn in the opposite direction as the steering wheel.To prevent personal injury, loss of life and/or property damage, make sure the drive is timed correctly.
The steering control unit controls the direction of the turn and the speed of the turn. The volume of oil that is supplied to the cylinder is proportional to the angular rotation of the steering wheel. The flow rate of the oil to the steering cylinder will increase as the steering wheel is turned faster. This will cause the cylinder to move faster.In order to check the steering time of the compactor, place the machine on a dry, hard, smooth surface. This will reduce the resistance to the contact area of the ground.With the engine at high idle, the time for a full right turn is one to two seconds. This will correspond to three turns of the steering wheel. With the engine at high idle, the time for a full left turn is one to two seconds. This will correspond to two and a half turns of the steering wheel.
Illustration 1 g00470238
Drive Timing of the Steering Control Unit. (1) Cross pin. (2) Rotor tooth. (3) Rotor. (4) Stator.Cross pin (1) must align with the bottom of the rotor tooth (2).