TM 5-3805-261-20HYDRAULIC SYSTEM TROUBLESHOOTING AND MAINTENANCE PROCEDURES. (cont)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONb.CIRCLE DRIVE OPERATES SLOWLY OR FAILS TO OPERATE.Step 1.Check the circle drive hydraulic hoses for leaks and loosefittings.If a circle drive fitting is loose--tighten. If a hose is damaged or defective--replace. Refer to paragraph 15-29.Step 2.Measure circle drive operation time. Using a stop watch, measure the amount of time for a onequarter revolution.The time for a one quarter revolution in either direction is between 9.5 and 11.5 seconds.If the time recorded is not within this range--replace circle drive. Refer to paragraph 15-6.If the time recorded is within range, a flow meter tee test should be performed. Contact Direct Support.c.BLADE FLOAT FAILS TO OPERATE.Step 1.Check the blade float hydraulic hoses for leaks and loose fittings.If a blade float fitting is loose--tighten. If a hose is damaged or defective--replace. Refer to paragraph 15-25.Step 2.Check to see if it is one or both sides of the blade that do not float.If both sides of the blade float do not operate--replace blade float pilot valve. Refer to paragraph 15-7.If one side of the blade float does not operate--replace blade float check valve. Refer to paragraph 15-8.15-4
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