User Manual

LEGEND FOR HYDRAULIC SYSTEM SCHEMATIC—LATER 420

1—Hydrostatic Transmission 10—Variable Hydrostatic 17—Steering Valve (5-Port) 24—Front Hydraulic

2—Output (Motor) Shaft Pump 18—Check Valve Outlets—Right Side

3—Hydrostatic Drive Motor 11—Input (Pump) Shaft 19—Oil Cooler 25—Front Hydraulic

4—Transmission Case Drain 12—Steering Wheel 20—Check Valve (3 used) Outlets—Left Side

5—Charge Relief Valve 13—Control Valve Section 21—Hydraulic Control Valve 26—Rockshaft Cylinder

6—Implement Relief Valve 14—Fluid Metering Section 22—Control Valve Spool 27—Rear Hydraulic Outlets

7—Check (Freewheel) Valves 15—Steering Cylinder (Three-Position) (2 used) (Optional)

8—Charge Pump 16—Drive Link Assembly 23—Control Valve Spool with

9—Filter “Float” (Four-Position)

MX,159027010,10-19-03MAY95

Hydraulic Schematics/Hydraulic System Schematics

TM1590 (17MAY95) 270-10-12 316, 318 & 420 Lawn and Garden Tractors

020895

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