MODULE GP-RELAY DRIVER 2934465 - Caterpillar

Troubleshooting
Troubleshooting can be difficult. A list of possible problems and probable causes is on the pages that follow.This list of problems and probable causes will only give an indication of where a problem can be and what repairs are needed. Normally, more or other repair work is needed beyond the recommendations on the list. Remember that a problem is not necessarily caused only by one part, but by the relation of one part with other parts. This list cannot give all possible problems and probable causes. The serviceman must find the problem and its source, then make the necessary repairs.The 4C4890 Fittings Group can be used to make pressure tests of the leveling blade system. Before any tests are made, visually inspect the complete hydraulic system for leakage of oil and for parts that are damaged. For some of the tests a magnet and a mm (in) measuring rule will be needed.When any test is made of the leveling blade hydraulic system, the hydraulic oil must be at the normal temperature for operation.
Sudden movement of the machine or pressure oil release can cause injury to persons on or near the machine. To prevent possible injury, do the procedure that follows before testing and adjusting the leveling blade hydraulic system.
1. Move the machine to a smooth horizontal location. Move away from working machines and personnel. Stop the engine.2. Permit only one operator on the machine. Keep all other personnel either away from the machine or in view of the operator.3. Activate the parking brake.4. Make sure all hydraulic pressure is released before any fitting, hose or component is loosened, tightened, removed or adjusted.Visual Checks
A visual inspection of the leveling blade system and its components is the first step when a diagnosis of a problem is made. Stop the engine, make the following inspections.1. Measure the oil level.2. Look for air in the oil that is in the tank. Do this immediately after the machine is stopped. Use a clear bottle or container to get a sample of the oil. Look for air bubbles in the oil that is in the bottle.3. Remove the hydraulic filter element and look for particles removed from the oil by the filter element.4. Check all oil lines and connections for damage.Performance Tests
Performance tests of the leveling blade system can be used for a diagnosis of poor performance and to find the source of oil leakage inside the hydraulic system. Problem: Steering pump makes noise and the blade cylinder rod does not move smoothly. Probable Cause:1. Air in the leveling blade hydraulic circuit.2. The steering pump is worn.3. Loose oil line connection on the inlet side of the steering pump.4. Low oil level in the tank.5. Viscosity of the oil is wrong.6. Blockage at suction strainer. Problem: Temperature of oil is too hot. Probable Cause:1. Low oil level in the tank.2. Viscosity of the oil is wrong.3. Air is mixed with the oil.4. Steering pump relief