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Maintenance ScheduleXR620/621/842/1045/1245/1254/1267/1534/2050/3034Table 3-6. Preventive Maintenance – After Every 500 Hours of Operation – Cont.Maintenance RequirementRefer toPara.Check radiator hoses for leaks, damage, and tightness 5-18Check engine electrical cables, leads, and connections for damage and tightness 5-19Check specific gravity of engine coolant 5-11Replace transmission fluid and filters (XR620/621/1045/1245/1254/1534) 6-5Replace hydraulic reservoir air breather 8-10Replace hydraulic return line filter 8-12Inspect wheel/tire assemblies 7-3Table 3-7. Preventive Maintenance – After Every 1,000 Hours of OperationMaintenance RequirementRefer toPara.Comply with 50-Hour Maintenance Requirements –Comply with 250-Hour Maintenance Requirements –Comply with 500-Hour Maintenance Requirements –Change transmission fluid (XR842/1267/2050/3034) –Change wheel-end oil 6-8Change differential oil 6-6Check valve tip clearance. Adjust if necessary. 5-16Inspect boom chains 10-5Replace hydraulic high-pressure filter 8-11Service Manual Rev 01 – 05/10 3-5P/N 24933-000