TM 10-3930-659-10 Table 3-1.  Troubleshooting (Con’t). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 2.  Check hydraulic oil level. If hydraulic oil level is low, fill to correct level (see LO 10-3930- 659-12).  If hydraulic oil level Is correct, notify Unit Maintenance. 15.  CONSTANT STEERING REQUIRED TO MAINTAIN STRAIGHT TRAVEL. Check for air in hydraulic system. If oil is foamy in hydraulic oil level sight gage, notify Unit Maintenance. HYDRAULIC SYSTEM 16.  HYDRAULIC SYSTEM DOES NOT FUNCTION. Check hydraulic oil level. If hydraulic oil level is low, fill to correct level (see LO 10-3930- 659-12).  If hydraulic oil level is correct, notify Unit Maintenance. 17.  HYDRAULIC FUNCTIONS ARE SLOW. Step 1.Check hydraulic system for cold oil. Cycle boom and fork attachments until oil reaches normal operating temperature. Step 2.Check outside of oil cooler for obstructions. Remove anything that blocks or impedes air flow. 18.  HYDRAULIC OIL TEMPERATURE EXCESSIVELY HIGH. Check for excessive loads. Reduce loads to lifting capacity of forklift truck (see paragraph 1-10). 3-9