RING-BACKUP 2K3258 - Caterpillar

Introduction
This troubleshooting guide can be an aid for the service personnel to find the cause of existing problems. Several common problems are covered in the guide, but these problems are not arranged in any particular sequence.Identify your particular type of problem from the Troubleshooting Index, then go directly to that problem in the guide. However, when you begin the procedure for that problem, start at Step 1 and follow through the step by step procedure. The steps that follow in a particular problem provide a definite sequence to be followed for a logical, one by one elimination of many variables. These steps are arranged in order from the most probable/easiest to check, to the least probable/most complex to check.Whenever the cause of the problem is found and corrected, stop the test (as shown by STOP). Do not continue through the complete procedure just because it is there.Troubleshooting Index
Problem No. 1: Fuel Linkage Has Limited Travel, Binds, Or Takes Excessive Force Step 1Check Linkage Separately Test Procedure:Remove bolt that holds linkage to actuator lever. Now check movement of the fuel linkage by itself. Test Results:A. Linkage moves to full FUEL ON position correctly: No mechanical problem with linkage. Go to Step 2.B. Linkage does not move smoothly, does not reach stop screw, or takes excessive force: Linkage is binding, or there is an engine problem. Repair linkage or engine. STOP. Step 2Check Actuator Separately Test Procedure:With linkage still disconnected from actuator lever, check lever movement by itself. Test Results:A. Actuator lever moves through its full range easily, but the lever travel is not greater than the fuel linkage travel at the full FUEL ON position. Not a actuator mechanical problem. Make an adjustment of lever length or position on actuator terminal shaft to eliminate this condition. Now install linkage back to actuator lever. STOP.B. Actuator does not move through full range smoothly, hangs up or takes excessive force. Actuator has internal mechanical problem. Repair or replace actuator. STOP. Problem No. 2: Engine Will Not Start Step 1Check For Actuator Travel Test Procedure:Crank the engine and check for Actuator Travel. Test Results:A. Actuator moves to FUEL ON position. Governor is not the problem. Check for engine problem and make the repair. STOP.B. Actuator does not move to FUEL ON position. Go to Step 2. Step 2Measure Cranking rpm Test Procedure:Crank the engine and measure the cranking rpm. Test Results:A. Cranking speed is less than 75 rpm (100 rpm for hot starts). Problem is in starting motor cranking circuit, engine, or engine has excessive load. Find and make the necessary repairs or corrections. STOP.B. Cranking speed is more than 75 rpm (100 rpm for hot starts). Go to Step 3. Step 3Manual Linkage Check Test Procedure:With engine stopped, manually move actuator lever and linkage to full FUEL ON position against stop screw. Test Results:A. Linkage moves through full travel smoothly until it is against stop screw, without binding or excessive force. Check backlash according to Service Procedure B. If linkage backlash