GUARD AS 2A7238 - Caterpillar

Visual Inspection
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.
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.
Implement System
When you are troubleshooting a problem, a visual inspection of the system is the first step. Turn the engine OFF before you inspect the machine. Lower all implements to the ground. Make sure that the Key Switch is OFF. Place all controls in the HOLD position. After performing the visual inspection, check the operation of the machine and note any unusual noises.Check the Fluid Levels
Fill all the oil reservoirs to the correct level.Reference: Refer to the Operation and Maintenance Manual for your machine.Expected Results
The oil levels are at the correct level.Results
OKAY: Proceed to "Check for Oil Leaks".Check for Oil Leaks
Inspect these components for leaks and for damage: oil lines, hoses, and fittings.
Look under the machine and attachments for oil that has leaked from the machine onto the ground.Expected Results
No leaks exist.Results
OKAY: Proceed to "Check the Electrical System".
NOT OKAY: Repair all leaks. Check the machine for the original problem. If the conditions are not resolved, proceed to "Check the Electrical System".Check the Electrical System
Inspect the wires and check the electrical connectors to the component that is suspect.Expected Results
The wires and the electrical connectors are not damaged. The electrical connectors are clean.Results
OKAY: Proceed to "Check for Oil Contamination".
NOT OKAY: Replace any damaged wires. Replace any damaged electrical connectors. Ensure that all the seals are properly in place. Check the machine for the original problem. If the conditions are not resolved, proceed to "Check for Oil Contamination".Check for Oil Contamination
Use the 175-7546 Oil Filter Cutter Gp to cut open spin-on filters to inspect the filter media for contaminants.
Check the oil for air and for excessive particles. Air in the oil causes the oil to foam. If particles are in the oil, the oil appears sandy.
Check the hydraulic oil by taking an oil sample from the S O S Sampling Valve. The S O S Sampling Valve is on the cooler bypass valve block in the engine compartment.Reference: Refer to Operation