ORIFICE 4364599 - Caterpillar

Hot oil and components can cause personal injury.Do not allow hot oil or components to contact skin.
The fittings on the filter cart and Portable Particle Analyzer may be hot.When the steering system is at operating temperature, the steering oil is hot and under pressure.
Kidney Loop Removal
Illustration 16 g02404598
Relieving possible steering tank pressure
To relieve possible tank pressure, press the button on top of the breaker relief valve (7). Refer to Illustration 16.
Illustration 17 g02404617
(11) Filter cart suction hose
(13) Filter cart discharge hose
Disconnect the filter cart suction (11) and discharge (13) hoses from the fill cap adapter. Install the dust caps on the couplers and nipples. Refer to Illustration 17.
Remove the fill cap adapter. Store filtering adapters in a clean location.
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Cap Installation
Install the strainer, retaining ring, and a clean filler cap to the steering tank filler neck. Refer to Illustration 18.
Check the steering tank oil level.
Inspect the steering system for leaks. Most steering contamination is brought into the system from an external source. To provide a long-term benefit, repairs must be completed before the machine is returned to service.
Remove the chocks from the rear wheels.Oil Compartment Filtration Times
If an on-line, portable particle counter is not available to diagnose and track when the contaminant level has lowered to an acceptable point, refer to the following equation. This equation relates to the 188-3242 Filter Cart Gp and 246-1157 Filter Cart Gp only. Other filtration units will have a different equation reference and will be noted when appropriate. There are various conditions that must be factored into the filtration efficiency of any filter cart and situation. Therefore, the following equation must be viewed as only a simple reference and not an absolute time or efficiency result.
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Oil compartment filtration equation
(A) Compartment oil capacity (gal)
(B) Pulses per minute
(C) Approximate filtration time (min)Pulses per Minute definition: Each air discharge or stroke of the air operated filter pump delivers one pulse of oil. The internal pump shaft will slide left (one pulse), and then to the right (one pulse), delivering oil going both directions. Another way of determining pulses is to listen for the TUK – CHUK (two pulses). Count the number of pulses in 1 minute for use in the above equation.Example: A 797 steering tank has 235 L (62.0 US gal) of SAE 10W oil. The filter cart is operating at 160 pulses per minute. The approximate filtration time should be 55 minutes.Oil Cleanliness Information
To establish a level of oil cleanliness, record an initial particle count of the bulk oil. The portable particle counting procedure is one of the techniques that can be used to determine the level of oil cleanness. The advantage to this process is that the test results are available at the time the oil sample is taken. The data can then be used as a baseline and compared to the value measured after a failure. The data can also be used whenever there is concern that debris may have contaminated the vehicle oil. A particle count unit electronically measures the count