ORIFICE AS 3091877 - Caterpillar

Personal injury or death can result from machine articulation or movement.Machine frames can move and a person can be crushed.Connect the steering frame lock link between the front and rear frames before working on machine.
Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine.To prevent personal injury or death, perform the following:Park the machine on a smooth, level surface.Lower the work tool to the ground and engage the parking brake.Stop the engine and remove the key.Block the wheels and install the steering frame lock.
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.
The hydraulic oil in this system is SAE 10. 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 steering system.
Start the engine and run the engine at high idle. Allow the oil temperature to reach the normal operating temperature.
Actuate the steering cylinders through a minimum of ten full cycles.
Stop the engine.
Move the STIC steer control and the brake pedals through all positions. Release any pressure in the steering system and the brake system.
Illustration 1 g03880532
(1) Fluid sampling valve
Insert a probe in fluid sampling valve (1). Fluid sampling valve (1) is located on the steering cooling system filter. Make sure that the STIC steer control is in the HOLD position.
Start the engine and allow the engine to run at low idle. Note: Do not operate the STIC steer control.
Draw a 50 mL (1.70000 oz) 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
ISO Code Particle Size (Microns) Maximum Number of Particles Per 1 mL Sample
18 5 2500
15 15 320 Note: The concentration of the particles by size should be monitored over a series of samples. This information can be used in order to spot abnormal wear before a failure occurs. A spectrographic analysis of the samples can be used in order to identify the composition of the particles. The analysis of the oil sample may be used in order to identify the components that are failing.