MUFFLER GP 1595787 - Caterpillar

Illustration 1. Location of red mark on 4W508 Differential Pressure Indicator.3. Remove the 3J5389 Plug (1/2 - 14 NPTF) from the cover. See Illustration 2. The higher, unfiltered oil pressure can be measured at the port where the plug was removed.4. Connect an oil line from this port to the high pressure port of the 4W508 Differential Pressure Indicator.5. Remove the 5M6214 Plug (1/8 - 27 NPTF) from the housing. See Illustration 2. The lower, filtered oil pressure can be measured at the port where this plug was removed.6. Connect an oil line from this port to the low pressure port of the 4W508 Differential Pressure Indicator.
Illustration 2. Location of plugs in oil filter group.