TM 5-3805-261-20 Section II.  HYDRAULIC SYSTEM MAINTENANCE. 15-3. HYDRAULIC SYSTEM MAINTENANCE PROCEDURES. a. The purpose of this section is to provide you with all needed instructions and  additional  information  to  help you at the organizational support level to keep the hydraulic system and its components in good repair. b. This section is arranged by functional group code and provides a list of hydraulic system components to be maintained and step-by-step maintenance procedures. INDEX Title Paragraph Page Hydraulic System Maintenance Procedures 15-3 15-7 Circle Drive Motor Assembly 15-4 15-8 Blade Float Pilot Valve 15-5 15-11 Blade Float Check Valve 15-6 15-15 Hydraulic Pump Relief Valve Assembly and Mounting 15-7 15-18 Circle Drive Check Valve 15-8 15-21 Leaning Wheel Check Valve 15-9 15-25 Sideshift Check and Relief Valves 15-10 15-29 Blade Tip Check and Relief Valve 15-11 15-33 Scarifier Check and Relief Valve 15-12 15-37 Centershift Check Valve 15-13 15-42 Right Blade Lift Check Valve 15-14 15-46 Articulation Check Valve 15-15 15-50 Left Blade Lift Check and Relief Valve 15-16 15-54 Hydraulic Control Valve Group 15-17 15-58 Hydraulic Control Linkages 15-18 15-70 Hydraulic Control Levers 15-19 15-73 Hydraulic Pump and Control Valve Lines and Fittings 15-20 15-84 Oil Cooler to Relief Valve and Hydraulic Tank Lines, Fittings and Hoses 15-21 15-92 Hydraulic Pump Assembly, Junction Block and Steering Control Valve Lines 15-22 15-101 Blade Float Lines, Fittings and Hoses 15-23 15-111 Blade Lift Lines, Fittings and Hoses 15-24 15-116 Blade Tip Lines, Fittings and Hoses 15-25 15-126 Leaning Wheel Hoses and Fittings 15-26 15-136 Circle Drive Motor Hoses and Fittings 15-27 15-143 Centershift Lines, Fittings and Hoses 15-28 15-149 Articulation Lines, Fittings and Hoses 15-29 15-156 Sideshift Lines 15-30 15-163 Scarifier Lines, Fittings and Hoses 15-31 15-171 Hydraulic Oil Cooler 15-32 15-176 Hydraulic Tank Filters 15-33 15-180 15-7