SAE J1227:2019 pdf free

SAE J1227:2019 pdf free.Assessing Cleanliness of Hydraulic Fluid Power Components and Systems
Static components can be evaluated by two basic methods. The first (which is historically probably the most commonly used) is a slosh test, which uses movement of a partially flled component to transfer the contaminant from the wetted surfaces of the static component to the clean test liquid. The second method is a flow test and recognizes the importance of achieving a Reynolds number equal to or greater than that achieved in service (see 4.2.1), and which measures the contaminant increase contributed by the static component to a circulating system. The slosh test is normally simpler and more economical and should suffice, except where it can be shown that the flow test removed significantly more contaminant.
Fill the component 1/3 to 1/2 full of clean test liquid and seal the component so that it can be mechanically agitated, vibrated,and shocked so as to loosen contaminants without spilling the test liquid. A specified plan for agitation, vibration, and shock consistent with the geometry of the component should be followed (see 4.2.2). The sealing method should be validated to assure that it does not add significant contamination. The fluid sample should be removed from large components, using the ISO 4021 method of Table 1 Section 4. Smaller components should be completely drained into a verified clean container (see 4.2.4).
Where appropriate, connect the static component to a precleaned (<10% rule) flow test stand capable of achieving a Reynolds number at the wetted surfaces of the component at least equal to the maximum it will see in service (see 4.2.1).The test stand can be similar to that shown in Figure 3 with the static component connected at points A and B and the directional control valve (7) positioned such that flow through the static component is in the normal direction of flow. Flow through the component for a time sufficient to assure that a hydraulic fluid volume at least equal to 10 times the test system liquid volume has passed through the component. After the minimum flow time withdraw a sample per ISO 4021 (Table 1 Section 4) (see 5.4).SAE J1227 pdf free download.