TK711, TK721, TK722 and TK732 Track Feller Bunchers Hydraulic System Hydraulic Oil Contamination - Test Caterpillar


Hydraulic Oil Contamination - Test
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------ WARNING! ------

To prevent personal injury when checks are made while the machine is in operation, make sure only approved personnel are on the machine. Keep other personnel off the machine and in view of the operator. Make sure checks are done in an open area.

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NOTICE

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, "Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids.

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 hydraulic system.

  1. Start the engine and run the engine at high idle.

  1. Actuate all cylinders through a minimum of ten full cycles.

  1. Lower the felling head to the ground.

  1. Reduce the engine speed to low idle.



    Illustration 1g00827465

    Hydraulic lockout control on early machines




    Illustration 2g01162814

    Hydraulic lockout control on later machines

  1. Move the hydraulic lockout control into the LOCKED position.



    Illustration 3g01052558

    Layout of the cab on early machines




    Illustration 4g01162235

    Layout of the cab on later machines




    Illustration 5g01074453

  1. Open the hood for the engine compartment.

    Note: The switch for the hood is located underneath the right armrest on early machines. On later machines, the switch for the hood is located on the right hand console.




    Illustration 6g00936045

    Pilot Filter

    (1) Hydraulic oil sampling port. (2) Pilot oil filter.

  1. Locate hydraulic oil sampling port (1). The oil sampling port is located on the base of pilot oil filter (2). The pilot oil filter is located by the implement control valve.

  1. Purge hydraulic oil sampling port (1). Insert an 8T-9208 Probe Assembly into hydraulic oil sampling port (1).

    Note: Use approximately 150 mm (6 inch) length of tube on the end of the probe. Drain approximately 100 mL (4 fl oz) of oil into a container for disposal. This will clean out the sampling port so that a good oil sample may be obtained.

  1. Use a clean tube to draw a 50 mL (2 fl oz) oil sample from the fluid sampling valve. Use an 8T-9190 Fluid Sampling Bottle in order to take the hydraulic oil sample.

  1. The recommended level of cleanliness for the hydraulic system is ISO Code 18/15. See Table 1 for the maximum allowable particle count.

    Table 1
    Hydraulic Oil Contamination    
    ISO Code     Particle Size (Microns)     Maximum Number of Particles Per 1 mL Sample    
    18     5     2500    
    15     15     320    

    Note: Use the information that is collected from a series of samples. Keep track of the changes in the concentration of particles by size from the oil samples. This information can be used to spot abnormal wear. Also, prevent problems before failure occurs. Use a spectrographic analysis in order to identify the metal particles that are found in the oil samples. This analysis can also point to the probable components that might be failing.

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