TM 10-3930-659-20 Table 4-1.  Mechanical Troubleshooting (Con't). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 2. Inspect front and rear universal joints for bends or damage. Replace bent or damaged universal joints (see paragraphs 8-1 and 8-2). Step 3. Inspect for worn support bearing. Replace worn support bearing (see paragraph 8-1). Step 4. Inspect for loose or missing mounting bolts. Tighten or replace mounting bolts (see paragraphs 8-1 and 8-2). Step 5. Inspect front and rear universal joints for proper alinement. Aline universal joints (see paragraphs 8-1 and 8-2). __________________________________________________________ AXLE 18.  DIFFERENTIAL OVERFILLED WITH HYDRAULIC FLUID. Remove differential fill plug (see paragraph 9-3) and apply service brakes.  Check for leakage from fill plug. If differential oil leaks from fill plug, notify Direct Support Maintenance. 19.  DIFFERENTIAL OR AXLE NOISE IS EXCESSIVE. Step 1. Inspect differential for low differential oil level (see paragraph 9-3). Fill differential with differential oil as required (see paragraph 9-3). Step 2. Drain differential oil (see paragraph 9-3) and inspect magnetic drain plug for metal shavings. If drain plug has metal shavings, notify Direct Support Maintenance. Step 3. Inspect service brake disc (see paragraph 10-7). If service brake disc is damaged, notify Direct Support Maintenance. _________________________________________________________ BRAKE SYSTEM 20.  BRAKING IS POOR OR NONEXISTENT. Step 1. Bleed brake system (see paragraph 10-17). Step 2. Test fork/brake hydraulic pump standby pressure (see paragraph 17-3). Adjust fork/brake hydraulic pump (see paragraph 17-3). 4-17