TM 10-3930-659-20 Table 4-1.  Mechanical Troubleshooting (Con't). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 13.  TRANSMISSION HYDRAULIC SYSTEM OVERHEATS. Step 1. Inspect transmission oil cooler for restricted air flow. Remove all exterior restrictions from transmission oil cooler. Step 2. Perform transmission fluid pressure test (see STE/ICE-R Test GO11). Step 3. Test transmission thermal bypass valve element (see paragraph 7-12). Replace transmission thermal bypass valve element (see paragraph 7-13). Step 4. Perform transmission oil cooler backflush (see paragraph 7-16). 14.  TRANSMISSION HYDRAULIC FLUID FOAMS. Step 1. Inspect for air in hydraulic fluid, proper fluid level, and correct type of fluid in transmission (see LO 10-3930-659-12). Add or drain hydraulic fluid as required (see TM 10-3930-659-10 or LO 10-3930-659-12). Step 2. Inspect transmission oil suction tube for leaks or damage. Replace leaking or damaged transmission suction tube (see paragraph 7-7). 15.  FORKLIFT TRUCK LACKS POWER AND ACCELERATION. Step 1. Inspect for air in hydraulic fluid, proper fluid level, and correct type of fluid in transmission (see LO 10-3930-659-12). Add or drain hydraulic fluid as required (see TM 10-3930-659-10 or LO 10-3930-659-12). Step 2. Perform transmission fluid pressure test (see STE/ICE-R Test GO11). Step 3. Inspect transmission clutch cutoff valve for sticking or damage. Replace sticking or damaged transmission clutch cutoff valve (see paragraph 7-11). 16.  TRANSMISSION SHIFTS TOO SLOWLY. Inspect transmission clutch cutoff valve for sticking or damage. Replace sticking or damaged transmission clutch cutoff valve (see paragraph 7-11). ______________________________________________________________ PROPELLER SHAFT 17.  FRONT UNIVERSAL JOINTS OR SUPPORT BEARING VIBRATION OR NOISE IS EXCESSIVE. Step 1. Inspect front universal joints or support bearing for improper lubrication. Lubricate front universal joints or support bearing (see LO 10-3930-659-12). 4-16