Tillage type
Tandem disk harrow
John Deere tillage equipment ยท 1990s to 2000s
John Deere 637 Disk
John Deere 637 Disk is a pull-type tandem disk harrow for primary or heavier secondary tillage, residue mixing, and surface leveling. Typical working widths are about 15 to 32 ft, with concave disk blades arranged in front and rear gangs.
Working width
About 15 to 32 ft
Working depth
Typically 3 to 7 in.
Production years
1990s to 2000s
John Deere 637 Disk specifications
| Tillage type | Tandem disk harrow |
|---|---|
| Working width | About 15 to 32 ft |
| Working depth | Typically 3 to 7 in. |
| Production years | 1990s to 2000s |
| Disk blade size | Typically 22 or 24 in., depending on configuration |
| Blade/shank spacing | Typically 9 in. blade spacing |
| Frame type | Pull-type, rigid or folding-frame configurations |
| Horsepower required | Typically 8 to 12 hp per ft |
| Approx. weight | About 6,000 to 20,000 lb, depending on width and blade package |
What the 637 Disk is used for
The 637 Disk cuts and mixes residue while breaking clods and leveling the soil surface. It can follow plowing or other primary tillage, or make a heavier secondary pass before a finishing tool. Working depth and gang angle are adjusted to match residue, soil condition, and the desired degree of soil movement.
Why the John Deere 637 Disk stands out
Front and rear gangs provide a balanced tandem-disk action that helps leave a more level surface than a single-direction disk. Blade size, gang angle, and optional rear attachments allow the tool to be matched to lighter finishing or more aggressive residue-mixing work.
Buying a used John Deere 637 Disk
Measure blade diameter and check for severely worn, cracked, or mismatched blades. Inspect gang bearings, spools, gang bolts, scrapers, and bearing hangers, since repairs can involve substantial labor. Check the hitch, rockshaft, fold cylinders, tires, and frame welds for damage or leakage.
John Deere 637 Disk frequently asked questions
Is the John Deere 637 a primary-tillage tool?
It can perform moderate primary tillage in previously worked ground, but it is also commonly used for heavy secondary tillage and residue incorporation.
Why are disk gang bearings important on a used 637?
Worn bearings can let gangs run rough or loose and may lead to damage to spools, shafts, blades, and hangers.
How do worn disk blades affect performance?
Smaller worn blades penetrate less effectively and leave less consistent cutting and mixing across the disk.
Specifications are commonly cited figures for general reference; exact figures vary by year and serial number, so confirm against TractorData.com and the machine's records. Values and prices of used tillage equipment vary by condition, use, and region. Page updated Aug 4, 2026.