TM10-3930-660-20 18-30. HYDRAULIC OIL FILTER -  REPLACE  (Cont’d) 1. UNSCREW HYDRAULIC FILTER ELEMENT (1) FROM FILTER BASE (2) . DISCARD FILTER ELEMENT (1) . 2. IF NECESSARY, REMOVE HYDRAULIC FILTER BASE (2) FROM VEHICLE. a. b. c. d. e. Remove hose (3) and elbow (4) from filter base (2). Plug hose (3). Unscrew sampling valve (5) from elbow  (6). Remove elbow (6). Remove four screws (8), lockwashers (9),  and  flatwashers  (10).  Discard lockwashers  (9). Remove filter base (2) from the  vehicle. INSTALLATION Remove caps and plugs as hoses are installed. Wipe all sealing surfaces on valve and hoses clean and dry. Apply film of clean hydraulic oil to all seals as they are installed. Apply Loctite 242 to threads of screws (8) as installed. 1. IF ON a. b. REMOVED, INSTALL FILTER BASE (2) VEHICLE. Support and position filter base (2)  on  vehicle.  Install  four flatwashers (10), four new lockwashers (9), and four screws (8) to secure filter base (2) to vehicle. Install  elbow  (6). 2. 3. 4. 5. c. Apply Loctite 59241 to threads of sampling valve (5) and screw sampling valve (5) into elbow (6) . Be sure drain end of valve (a) is facing down. d. Install elbow (4) and hose (3) to filter  base  (2). INSTALL FILTER ELEMENT (1) a. Lubricate the seal on new filter (b) with a thin coat of fresh oil. b. Screw new filter element (1) onto base  (2). START AND RUN ENGINE FOR ONE MINUTE. CHECK FOR LEAKS AT FILTER ASSEMBLY AND AT HYDRAULIC CONNECTIONS. REFILL HYDRAULIC TANK, PARA. 5-10. INSTALL TRANSMISSION COVER, PARA.  16-6. 18-120