CLIP 2284597 - Caterpillar

Escaping fluid under pressure, even a pinhole 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.Always use a board or cardboard when checking for a leak.
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.
Note: Use oil with the correct viscosity for the operating conditions. If the oil becomes contaminated, premature component failure could result. Contaminated oil can also contribute to overheating. Use the following procedure to sample the oil in the brake system.
Start the engine and run the engine at high rpm.
Actuate all cylinders through a minimum of ten full cycles.
Actuate the service brakes in order to cycle the charging system for the brake accumulators.
Lower the bucket to the ground and stop the engine.
Move all control levers and brake pedals through all positions in order to release any pressure in the hydraulic system.
In order to relieve all of the pressure in the hydraulic oil tank, press and hold down the plunger on the breaker relief valve. The breaker relief valve is located on the hydraulic oil tank.
Insert a probe in the fluid sampling valve near the hydraulic oil tank. Make sure that all of the hydraulic controls are in the HOLD position.
Start the engine and allow the engine to run at low idle. Do not operate the hydraulic controls.
Draw a 50 mL oil sample through the fluid sampling port. The level of contaminants must be lower than the values in the following table.
Table 1
Hydraulic Oil Contamination    
Particle Size (Microns)     Maximum Number of Particles    
10 to 20     48000    
21 to 50     2580    
51 to 100     150    
100 or more     20    Reference: For additional information about the various lubricant viscosities, refer to the Service Manual module Operation And Maintenance Manual, "Lubricant Specifications" for the machine that is being serviced.