CYLINDER GP-BOOM 4781347 - Caterpillar

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.
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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
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 system:
Start the engine and run the engine at high rpm. Allow the oil temperature to reach the normal operating temperature.
To circulate the oil, move the Steering Transmission Integrated Control (STIC) repeatedly through all travel positions and depress the brake pedal repeatedly.
Run the engine at low idle. Note: Make sure that the STIC steering control lever is in the LOCKED position. Do not operate the Steering Transmission Integrated Control (STIC) or the brakes.
Illustration 1 g02708117
Left side view
Illustration 2 g02707996
Location of pilot oil pump
Drain 50 mL (1.7 fl oz) of oil from the sampling valve on the pilot oil pump for the steering system in order to clean out the sampling valve. Properly dispose of the oil.
Draw another 50 mL (1.7 fl oz) of oil from the sampling valve for analysis. 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 Note: For additional information about taking a good oil sample, refer to Special Publication, PEHP6001, "How To Take A Good Oil Sample" for the machine that is being tested.