TM10-3930-660-20 W -  Weekly Q - Quarterly S -  Semianually A -  Annually Item To Be Inspected Procedure: Check for and repair, fill or adjust as necessary THE FOLLOWING ITEMS MUST BE CHANGED AFTER THE FIRST 50 HOURS   OF   OPERATION: - Planetary gear oil. Refer to para. 11-4. -  Differential  oil. Refer to para. 11-3. - Hydraulic oil filter element. Refer to para. 18-30. - Engine oil and engine oil filter element. Refer to para.  4-3. THE FOLLOWING ITEMS NECESSARY AFTER THE - Boom electrical MUST BE CHECKED FIRST 100 HOURS cable  tension. AND ADJUSTED IF OF  OPERATION: Refer to para. 18-25. - Boom hydraulic base tension. Refer to para. 18-25. BOOM CHAIN Check boom chain tension. With the boom fully extended in a horizontal position, measure the retract chain sag at the middle of the intermediate boom section. The chain sag should be approximately 3-1/4 to 3-1/2 inches from the top of the chain to the bottom of the boom. Refer to para. 18-24 if the chain requires adjustment. BOOM ELECTRICAL CABLE AND HYDRAULIC HOSES The boom electrical cable and hydraulic hoses also require adjustment at 100 hours of operation and at 100 hours after replacement or else damage to the  forklift  may  occur. Check cable and hose adjustment. Refer to para. 18-25 for adjustment procedures. FORK BUSHINGS AND WEAR PADS Check fork bushings and wear pads for excessive obvious  damage. Replace wear pads when worn to 3/8 of an inch. Refer to para. 18-17 and para. replacement instructions. wear and less  than 18-18 for 2-6