TM 10-3930-659-20 9-3. DIFFERENTIAL OIL REPLACEMENT. This task covers: a. Inspection c.. Filling b. Draining Initial Setup. Equipment Conditions: Materials/Parts: • Forklift truck parked on level surface. • Lubricating oil (Item 25, Appendix C) • Parking brake set (see TM 10-3930-659-10). References: Tools/Test Equipment: • TM 10-3930-659-10 • General mechanic's tool kit (Item 44, Appendix F) NOTE Front and rear differential oil level is inspected, drained, and filled the same way.  Front differential is illustrated a. INSPECTION 1. Remove fill plug (1) from front differential (2). 2. Inspect  oil  level.    Oil  level  should  be  up  to  fill plug (1) hole in front differential (2). 3. Add oil as necessary (see subparagraph c). 4. Install   fill   plug   (1)   on   front   differential   (2). TA706745 9-6