A caster wobbling on worn spindle bushings or a fold cylinder weeping past its seals will park an ST820 precision tillage system right when the ground is ready, and this 230-page Flexi-Coil ST820 service manual PDF (OEM ID NW-010V2) is the factory answer for both. Hydraulic schematics trace every cylinder circuit through the fold and leveling functions, while the wiring diagram and connector service kit instructions cover the electrical side of your remote switches. Troubleshooting tables for the trips, openers, and air system run fault by fault to a fix, and the leveling procedure walks the frame back to true. When you rebuild the trip assemblies, torque the 3/4 inch trip mount v-bolts on 350 lb release trips to 240 N-m (175 lbf-ft), and reject any trip spring shorter than 216 mm (8.5 in). Guessing at trip torque costs shanks. This bookmarked, text-searchable PDF downloads in minutes, so the drill seeds this week, not after the rain.
What's Inside This Flexi-Coil ST820 Manual
| System | Pages | Key Topics |
|---|
| General Information | 7-36 | General Service Information, Important Information, Service Tools, Safety, Specifications, Units of Measure and Abbreviations, Conversion Chart |
| Adjustments | 37-58 | Wing Lift Adjustment (Three Section Outer Wing), Leveling Procedure, Final Leveling, Wheel Standard Restraint Chain Adjustment, Sweep Pitch Adjustment, Setting the Depth Gauge, Weight Transfer Kit Nw-547K |
| Mechanical Service | 59-124 | Troubleshooting Tables, Grease Locations, Yearly Maintenance, Wheel Bolt Torque, Tire Pressures, Hubs, Spindles, Wheels and Walking Beams, Caster Hub and Spindle Maintenance, Fold Linkages |
| Hydraulics | 125-144 | Ram Mount Depth Stop Connection, Replace Seals in Cylinders, Hydraulic Cylinder Components |
| Electrical | 145-164 | Connector Service Kit, Remote Switch Installation |
| Trips and Openers | 165-176 | Troubleshooting Tables, Trip Compressor Tool Kit, Tension Link Kit Tp-133K for the 550 Pound Trip, Adjustment of Trip Assemblies, Anti-Skewing Trip Shim Installation, Trip Shim Kit for the 650 Pound Trip |
| Air System | 177-188 | Troubleshooting Tables, Hoses, Theory of Operation, Balancing the Air Flow, Methods of Determining Adequate Carrying Velocities, Header Assemblies, Hose Holder Brackets and Distribution Clamps |
| Options | 189-230 | Harrows, Heavy Harrows, Press Wheels and Packer Gangs, Endmarker |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| 1/4 UNF Grade 2 Lubricated Torque | 5.7 N·m | p. 23 |
| 350 lb Trips | 260 N-m (190 lbf-ft) | p. 55 |
| Space between the bushings and the washers | 2 cm (3/4") | p. 81 |
| Minimum spring length | 216 mm (8.5 in) | p. 199 |
| Maximum transport speed | 30 km/hr | p. 12 |
| Maximum exposed thread on depth link adjuster | 146 mm | p. 45 |
| 350 lb trip mount V-bolt torque | 240 N-m | p. 55 |
| 550 lb trip mount V-bolt torque | 700 N-m | p. 55 |
| 650 lb trip U-bolt torque | 240 N-m | p. 55 |
| Wheel bolt torque (all tire sizes) | 170 N-m | p. 84 |
| 3/8" Nut dry torque | 31 N-m | p. 133 |
| 1/2" Nut dry torque | 60 N-m | p. 133 |
