2. TROUBLESHOOTING 2. TROUBLESHOOTING Diagnose malfunction charts are arranged from most probable and simplest to verify, to least likely, more difficult to verify. Remember the following steps when troubleshooting a problem : Step 1. Operational check out procedure (see group 3 in section 1) Step 2. Operational checks (in this group) Step 3. Troubleshooting Step 4. Tests and adjustments (see group 3) 5-10 Problem Cause Remedy No steering Low oil level. Restricted suction line. Failed hydraulic pump. Failed main hydraulic pump drive. Stuck priority valve spool in MCV. Broken priority valve spring in MCV. Failed hydraulic lines. Add recommended oil. Check.
Remove and inspect return filter for metal pump particles. Do main pump flow test. Remove and inspect priority valve spool in MCV. Remove and inspect spring. Check. Slow or hard steering Too much friction in the mechanical parts of the machine. Cold oil. Low priority valve pressure setting. Worn hydraulic pump. Sticking priority valve spool in MCV. Broken priority valve spring in MCV. Pinched or restricted LS line. Low system relief valve setting. Low overload relief valves setting. Lubricate bearings and joints of frame or cylinders or repair if necessary. Check steering column installation. Warm the hydraulic oil. Do priority valve pressure test. Do hydraulic pump performance check.
Remove and inspect. Remove and inspect. Inspect line. Test and adjust if necessary. Test and adjust if necessary.