HOSE AS 5170099 - Caterpillar

Visual Checks
Do not check for leaks with your hands. Pin hole (very small) leaks can result in a high velocity oil stream that will be invisible close to the hose. This oil can penetrate the skin and cause personal injury. Use cardboard or paper to locate pin hole leaks.
1. Check the oil level of the hydraulic tank.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. Check all oil lines, hoses and connections for leaks and damage. Look for oil on the ground under the machine.4. Remove and check the hydraulic return filter element for foreign materials. a. Shiny steel particles give an indication to pump gear or vibration motor failure or deterioration.b. Rubber particles give an indication of a seal or hose failure.c. Aluminum particles give an indication of vibration pump group failure.Whenever foreign particles such as rubber or metal are found, all the components of the vibration and conveyor/auger circuits must be flushed through. Each loop line circuit must be independently filtered. Do not use parts that have been damaged.Operation Checks
See subject Testing And Adjusting in KEBR1232 ASPHALT SCREEDS for additional information on the screed portion. Problem: A large amount of air in the oil. Probable Cause:1. A leak in the oil line between the tank and the pump(s).2. Failure to correctly bleed a hydraulic system after assembly, inspection or testing.3. Use of wrong hydraulic oil (not meeting specifications). Problem: Pump(s) too noisy. Probable Cause:1. If all the machine's systems pumps are found to be noisy, there is probably air in the oil (oil aeration).2. If the noise is found to be in only the vibration system pump, it is probably caused by wear or damage to that pump.3. The hydraulic oil is not at operating temperature. Problem: Hydraulic oil temperature is too high. Probable Cause:1. Operation of the machine with one or more relie valves open longer than necessary.2. Oil aeration (air mixed with the oil).3. A restriction to the flow of cool air through the oil cooler.4. Ambient (outside) air temperature too high.5. A restriction to the flow of oil through cooler. Problem: Vibrators will not operate. Probable Cause:1. Power STOP-GO switch on operator console in STOP position.2. Compactor switch on operator console in OFF position.3. Console selector switch on left control panel positioned for wrong console.4. Control panel circuit breaker tripped.5. Power STOP-GO switch terminals corroded, wires off, or switch defective.6. Vibration pump defective. Problem: Vibrators do not stop when compactor switch moved to OFF.1. See subject Testing And Adjusting in KEBR1232 ASPHALT SCREEDSInstrument Tests
The 4C4890 Fittings Group can be used to make pressure tests on the vibration 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