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 |
Flexi-Coil ST820 Common Problems This Manual Covers
Flexi-Coil ST820 floating hitch bushings worn out, hitch clunks and rocks on the drawbar
Inspect the floating hitch hooked to the tractor: pry the drawbar up and down and watch the pivot for slop. Set the space between the bushings and the washers to 2 cm (3/4 inch) as specified on page 81. Replace worn bushings early; once the bore goes oval you are into torch and welder territory.
Manual Section: Mechanical Service p. 81Hydraulic cylinders won't hold pressure, frame bleeds down overnight in the yard
Check every cylinder for oil weeping past the rod wiper, then raise the frame and watch for drift over ten minutes. Replace seals in any leaking cylinder using the procedure in the Hydraulics section starting on page 125. Torque 1/2 inch nuts to 60 N-m dry from the chart on page 133 during reassembly.
Manual Section: Hydraulics p. 125Outer tines have excessive play, trip assemblies rattle and shanks wander in the row
Grab each outer tine and rock it; any movement means loose mounts or worn pivots. Torque the 3/4 inch trip mount V-bolts to 240 N-m (175 lbf-ft) on 350 lb trips, or the 7/8 inch bolts to 700 N-m (500 lbf-ft) on 550 lb trips, per page 55. Replace bushings that stay loose after torquing.
Manual Section: Adjustments p. 55Wheel bolts keep loosening on road transport, wheels wobble and shimmy between fields
Torque all wheel bolts to 170 N-m (125 lbf-ft) after the first hour of transport and again each season, using the tire and torque table on page 84. Check tire pressure against that same table before every road move, and hold speed under the 30 km/hr limit listed on page 12.
Manual Section: Mechanical Service p. 84Shovels won't enter hard ground, rear rows cutting shallow with ridging between passes
Check frame level first; a nose-high machine keeps the rear shovels riding out of the ground. Run the leveling procedure in the Adjustments section starting on page 39, and keep exposed thread on the depth link adjuster under 146 mm per page 45. Work through the mechanical troubleshooting table before tearing anything apart.
Manual Section: General Mechanical TroubleshootingFrequently Asked Questions
What are the torque specifications for the 550 lb trip mount V-bolts?
For the 550 lb release trips, the 7/8" grade 8 trip mount V-bolts should be torqued to 610 N-m (450 lbf-ft). p. 174
What is the recommended torque for wheel bolts?
The recommended torque for all wheel bolts is 170 N-m (125 lbf-ft) as specified in the table on page 84. p. 84
What is the required offset for mud scrapers to prevent interference?
The required offset for mud scrapers to prevent interference with the opener or chisel plow sweep is 18.4 cm (7.25"). p. 124
What is the maximum length of exposed thread allowed on the depth link adjuster?
The maximum length of exposed thread on the depth link adjuster should not exceed 146 mm (5 3/4"). p. 45
What is the recommended torque for 3/4" fine thread shank bolts on 650 lb trips?
The 3/4" fine thread shank bolts on 650 lb release trips should be torqued to 542 N-m (400 lbf-ft). p. 174
Do I get instant access to this Flexi-Coil ST820 Service Manual?
The whole 230-page manual arrives as one searchable PDF at checkout. Read it at the desk, then take the phone out to the machine.
Can I print specific sections of this Flexi-Coil ST820 Service Manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
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