MODEL 66-80 VIBRATORY DRIVER/EXTRACTOR
IV. MAINTENANCE AND ADJUSTMENTS
I. CHANGING HYDRAULIC RETURN FILTER ELEMENT
1. The 2 return filters are located in the hydraulic reservoir above the manual
hand pump.
2. To remove filter elements, remove the 4 hex head screws and remove the
cover assembly. Screw driver slots are provided at bottom to aid in removing
the cover. (Note: Approximately 1 gallon (3.8L) of oil will be lost per filter.)
3. Remove the bypass valve and spring assembly from filter housing. Remove
the element.
4. Clean filter housing interior and all component parts with a lint-free rag.
5. Check O-ring for damage. Lubricate with multi-purpose grease.
6. Install new filter element (P/N 140403).
7. Replace bypass valve and spring assembly.
8. Replace cover and tighten 4 hex head screws.
9. Repeat for second filter.
10. Start power unit and run for approximately five minutes. Stop power unit and
check for leaks.
IV-9
