J&M 220 Operating And Maintenance Manual - page 41

MODEL 220 

HYDRAULIC 

IMPACT HAMMER 

IV. 

MAINTENANCE AND ADJUSTMENTS 

L.  CHANGING HYDRAULIC RETURN FILTER ELEMENTS 

1.  The return filters are located on the hydraulic reservoir above the hex key rack. 

2.  To remove the return filter elements, you must use a filter wrench capable of 

accepting a 5" diameter filter.  (Available at your local auto-parts store.) 

Unscrew the return filter elements counterclockwise to remove. Remove both 

filter elements and gaskets from the filter housing. 

3.  Clean filter housing with a lint free rag. 

4.  Install the new gaskets to the new filter elements.  Apply a light coating of multi-

purpose grease to the top of each gasket. 

5.  Screw the return filter elements and gaskets clockwise onto the filter housing 

until the gaskets make contact to the filter housing base. 

6.  Using the filter wrench, tighten both return filter elements approximately 3/4 of a 

turn. 

7.  Repeat above with the other two return filters. 

8.  With four new return filter elements  installed, start the power unit and run for 

approximately three minutes.  CHECK FOR LEAKS. 

IV-8