LATCH 9Y2656 - Caterpillar

Hydraulic oil pressure can remain in the hydraulic system on this machine after the engine and pump have been stopped. Serious injury can result if this pressure is not released before any service is done on the hydraulic system. In order to prevent possible injury, release the hydraulic system pressure before working on any fitting, hose, or hydraulic component.Lower all work tools to the ground before service is started. If the hydraulic system must be serviced, tested, or adjusted with the work tool in the raised position, the work tool and lift cylinders must be supported properly.Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made.
Personal Injury or death can result from improperly checking for a leak.Always use a board or cardboard when checking for a leak. Escaping fluid under pressure, even a pin hole size leak, can penetrate body tissue, causing serious injury, and possible death. If fluid is injected into the skin, it must be treated immediately by a doctor familiar with this type of injury.
In order to identify hydraulic problems, a visual inspection of the hydraulic system should be performed first. Stop the engine and lower the work tools to the ground. In order to remove the hydraulic tank filler cap, turn the filler cap counterclockwise. Allow the tank pressure to escape before removing the filler cap. Make the following inspections:
Check all hydraulic oil line connections for damage and leaks.
Follow all hydraulic oil lines from the implement cylinder to the valve. Check the lines and connections for damage and leaks.
Check the control valves for leaks.
Check the pump and connections for damage and leaks.
Follow the pump lines to the tank and valves. Check the hydraulic lines and check the hydraulic tank for damage and leaks.
Check the oil level in the tank.Note: A breaker relief valve is installed in the tank. Pressure relief is set to operate at approximately 140 21 kPa (20.3 3.0 psi). The vacuum relief valve is set to operate at 0 to 2 1 kPa (0.3 0.1 psi) less than atmospheric pressure.
Use a clear container in order to obtain an oil sample from the tank. Obtain an oil sample immediately after the machine is stopped. Check for air bubbles in the oil sample.
Remove the filter element. Check for particles in the filter elements. A magnet separates ferrous particles from nonferrous particles.
Inspect the control linkage for damaged components.