HOSE 1226898 - Caterpillar

Preparation for Troubleshooting
Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system.
Park the host machine on a smooth, level surface. Move away from other operating machines and away from personnel. Lower the work tool to the ground. Stop the engine.
Permit only one operator on the host machine. Keep other personnel away from the host machine or in the operator's sight.
Engage the parking brake. Place chocks in front of the tracks or wheels and behind the tracks or wheels.
When the work tool is raised for testing or for adjusting, make sure that the work tool is supported correctly. The lift circuit has high oil pressure when the lift arms raise the work tool.Note: Do not stop the host machine with the work tool off the ground unless this is required for a test. Lower the work tool to the ground and stop the engine.
Cycle the hydraulic control levers through all positions in order to release the pressure in the hydraulic system. Refer to the Service Manual of your host machine for the correct procedure to release the pressure within the hydraulic system.During a diagnosis of the hydraulic system, remember that correct oil flow and correct pressure are necessary for correct machine operation. The pump output increases as the engine speed increases and vice versa. Oil pressure is caused by resistance to the flow of oil.Visual Inspection
A visual inspection of the hydraulic system is the first step when you troubleshoot a problem. The inspection should be made with the engine off. Lower the work tool to the ground.
Personal injury or death can result from sudden work tool movement.Sudden movement of the work tool can cause injury to persons near the work tool.To prevent injury or death, make sure that the area around the work tool is clear of personnel and obstructions before operating the work tool.
Personal injury or death can result from improperly checking for a leak.Always use a board or cardboard when checking for a leak. Escaping air or fluid under pressure, even a pin-hole size leak, can penetrate body tissue causing serious injury, and possible death.If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Check the level of the oil in the hydraulic tank. Slowly loosen the fill/vent plug and release the pressure before the fill/vent plug is removed.
Remove hydraulic filter elements and check for material that would give