Allis Chalmers — 1. Filter header (base) 4. O-ring 7. Filter/water separator
For these Allis Chalmers models: 433T & 433I, 6138, 6138LT-6138T, 649, 649T & 649I, 670, 67381, 685, 685I, 685T, Series 433, Series 606.
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Procedure
- 2. Vent screw or plug 5. Threads 8. Drain cock or plug & o-ring
- 3. Threaded insert 6. Gasket 9. Filter
Source: manual:Allis_Chalmers_Series_433-649-670-685-6138_Manual-1.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.