830 Mower-Conditioner

830 Mower-Conditioner


  • Optional V10 rolls and Wide Swath Kit
  • Modular-design cutterbar
  • Adjustable roll pressure
  • Hydraulic tongue positioning
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Urethane roll conditioner available

Urethane rolls Urethane rolls

The 630 and 635 Side-Pull Mower-Conditioners and the 830 and 835 Center-Pivot Mower-Conditioners are available with a urethane roll conditioner.


The urethane roll conditioner works well in legumes, especially alfalfa, and most all-grass crops.


In general, roll conditioners are better suited for thick-stemmed, cane-type crops, and crops more than 1.5 m (5 ft) tall.


Molded urethane rolls are formed by a cool molding process that does not distort or warp the steel core of the roll:

  • This process ensures the rolls are straight and cylindrical, so they can be accurately spaced close together for uniform conditioning along the length of the roll.

An intermittent recessed cleat design gives more crimping edges for greater pressure per square inch, which results in superior conditioning and faster crop drying.

Shields removed for illustration purposes Shields removed for illustration purposes

Power is distributed by the platform and conditioner drive gearboxes:

  • Gearbox uses heat-treated, steel-forged spur gears for added strength.
  • Drive gears operate in a sealed environment to prevent excessive wear or contamination.
  • Telescoping drivelines ensure positive drive.
  • Spur gears have two to three teeth intermeshing at all times for a smooth, positive drive.

Wide swath kit

Wide swath kit Wide swath kit

The wide swath kit is a factory-installed option for the 630, 635, 830, and 835 Mower-Conditioner models.

When equipped with an impeller conditioner the kit consists of a redesigned, base swath board and four (3.0-m [9.8-ft]) or six (3.5-m [11.5-ft]) steel vanes bolted to the bottom of the swath board.

On roll conditioner machines the kit also comes with a redesigned, base swath board but has six (3.0-m [9.8-ft]) or eight (3.5-m [11.5-ft]) steel vanes.

When the forming shields are fully open, this kit will increase windrow width up to 25 percent over the base configuration of the machines.

Rockshaft swivel hitch and tongue

Swivel hitch Swivel hitch

For added maneuverability, the 830 and 835 Mower-Conditioners offer an optional rockshaft swivel hitch. The swivel hitch includes an overrunning clutch behind the primary driveline to enable free rotation of the tractor hookup to make attaching to the tractor easier.


The swivel hitch is available in 1000 rpm power take-off (PTO) only. It attaches to the lower lift arms of a Category 2 or 3N 3-point hitch with or without quick-hitch.


This option enables cutting square corners without the need to reposition the platform using tractor hydraulics, as well as making it easier to cut around field obstacles.


U-joint angles remain constant for reduced driveline noise and vibration in turns. A powerline support cable keeps the driveline out of the dirt when detached from the tractor.


A parking stand allows quick and easy hookup. A down stop chain is also included to limit travel of the rockshaft to prevent damage to the implement driveline.

Modular-design cutterbar

Modular cutterbar Modular cutterbar

John Deere's patented design cutterbar is made from individual, diagonal-cut modules.

Serviceability is easy. Modules can be removed individually while leaving the cutterbar attached to the frame.


Made of high-strength nodular-iron castings, each module consists of two idler gears and one drive gear. The large-diameter idler gears transmit power from module to module. The idler gears turn at a relatively slow speed for added durability.

The smaller-diameter pinion drive gear is used only to power the cutting disk. Power is not transmitted from one cutting disk to another except through the large-diameter idler gears.


The modules are interchangeable. Disk rotation is determined by the position of the quill (A). There is a rubber oil seal between each cutting module.

Impeller conditioner

Impeller conditioner Impeller conditioner

Impeller conditioning is standard equipment on all John Deere mower-conditioners.


Proper conditioning in a wide range of crops can be achieved when the conditioner is properly adjusted.


The impeller conditioner works well in legumes, especially alfalfa and most all-grass crops. Impeller conditioners are not recommended for thick-stemmed or cane-type crops, such as sudan or sudex, or crops over 5 ft tall.

How an impeller conditioner works:



1. As hay is cut by rotating knives, tines pick up the plants and carry them through the machine:

  • 33 V-shaped tines are on the 625 MoCo; 45 V-shaped tines are on the 630 and 830 MoCo; and 57 V-shaped tines are on the 635 and 835 MoCo.
  • Tines are free swinging to reduce damage to the conditioner if rocks or other solid objects are struck.

2. As the plant passes through, it rubs against the conditioning hood (A) and other plants:

  • Scuffing action removes the waxy surface from the stem of the plant to allow faster evaporation of moisture.

Impeller hood crank handle Impeller hood crank handle
Impeller hood position indicator Impeller hood position indicator
  • Conditioner hood opening is adjustable to accommodate various crop volumes.
  • Crank handle allows an infinite number of adjustments between the minimum and maximum conditioning levels. The closer the hood is to the tines, the more aggressive the conditioning.
  • Conditioner position indicator provides an easy reference point to control the degree of conditioning.
630 MoCo (shown with shields removed) 630 MoCo (shown with shields removed)

3. The speed at which the tines rotate will also affect the degree of conditioning. Two impeller speeds can be achieved by interchanging the upper sheave (A), located under the shield, and the lower sheave (B).

  • With the sheaves in the position shown, the impeller turns at 870 rpm; this is ideal for grasses.
  • If the sheaves are reversed, the impeller turns at 630 rpm; this is ideal for legume crops.

Windrow formation

Handle for forming-shield adjustment Handle for forming-shield adjustment

Forming shields are easily adjusted to control material flow. This allows the operator to match the windrow width to harvesting requirements.

Handle for swathboard adjustment Handle for swathboard adjustment

A swathboard is in base equipment for additional control of windrow formation.

The windrow width* is as follows:


830 89 cm to 198 cm (35 in. to 78 in.)
835 99 cm to 238.8 cm (39 in. to 94 in.)

*Depending on crop conditions.

V10 steel roll conditioner

Close-up of V10 steel conditioning rolls Close-up of V10 steel conditioning rolls

The V10 steel conditioner rolls feature 10 angled flutes arranged in a chevron, or V-pattern along the length of the steel core.

Steel rolls offer improved wear life over urethane rolls, particularly in adverse crop conditions.

Advantages of the V10 conditioner roll over the previous straight flute design are as follows:

  • More crimping edges for improved conditioning
  • Improved feeding
  • Improved windrow formation

Rotary disk cutterbar

Rotary cutterbar Rotary cutterbar

The rotary cutterbar is designed and built by John Deere. Large oval disks with free-swinging knives are used to cut the crop.


All cutting disks are the same and are computer-designed for improved wear and cutting performance.


Cutting disks are made of high-strength austempered steel to ensure the steel is thoroughly and evenly tempered for good wear characteristics.


The disks rotate to give a knife-tip speed of 307 km/h (191 mph) for clean cutting.


The knives are free-swinging to reduce damage if a solid object is struck, and they are reversible to double the useful life.


The knives are removed at the front of the cutterbar for convenience.

Wear caps
Wear caps Wear caps

Made of austempered heat-treated ductile steel for excellent wear characteristics, wear caps are installed on each end of the cutting disks (except on the end disks where crop accelerators are used) to increase the wear life of the cutting disks and knife-bolt nuts.


Wear caps are open on the end to prevent debris from packing in close to the nut, making hardware and knives easier to change.

Equal-angle hitch and tongue

Drawbar equal-angle hitch Drawbar equal-angle hitch

An overrunning clutch located behind the primary driveline enables free rotation of the tractor hookup to make attaching to the tractor easier.


The drawbar equal-angle hitch and tongue are in base equipment on the 830 and 835 Mower-Conditioners.

The equal-angle hitch and tongue includes:

  • Ball-joint hitch—to be installed on the mower-conditioner tongue
  • Tractor hookup
  • Drawbar extension—to be bolted onto tractor drawbar


The drawbar equal-angle hitch and tongue cannot be converted to a rockshaft swivel hitch and tongue.


The drawbar equal-angle hitch is designed to be towed by a tractor only and includes a screw jack and safety chain.


Turn limiters may be required to prevent powerline damage if the hitch point of the tractor is beyond the rear drive wheels of the tractor.


Power requirements

PTO speed 540 or 1,000 rpm
HP 540 rpm PTO
HP 1000 rpm 1-3/8 in. PTO 52-112 kW
70-150 hp
HP 1000 rpm 1-3/4 in. PTO
Powerline type Double-telescoping Grob spline (swivel is tube)
Hydraulic pressure required 13,790 kPa
2,000 psi


Type John Deere
Cutting width 3 m
9.8 ft
Cutting height 2-9.5 cm
0.8-3.7 in.
Number of disks 6
Number of knives 12
Disk speed 2,650 rpm
Knife tip speed 307 km/h
191 mph
Disk drive Gear
Lubrication Hy-Gard oil
Oil reservoir capacity 7 L
7.4 U.S. qt
Cutterbar oil check Combination check, drain plug
Cutterbar angle Adjustable
Angle adjustment Mechanical standard
Angle range
Cutterbar protection Shearhub
Adjustable gauge shoes Yes


Impeller Width
185 cm
73 in.Diameter
60 cm
23.5 in.Number of V-tines
45Number of speeds
3-V powerband belt and sheavesConditioner hood
Adjustable, single hand crank
Rolls Width
185 cm
73 in.Diameter
25.4 cm
10 in.Type of material
Recessed cleatSpeed
664 rpmDrive
Telescoping shaft

Tractor hookup

Standard hitch
Ball joint equal angle hitch Standard
Rockshaft swivel hitch Optional
Drawbar swivel hitch


Overall width Transport
3 m
9.8 ft
Overall length Conventional transport
6.3 m
20.6 ft
Weight With urethane roll conditioner
Equal angle: 2,519 kg
5,553 lbWith impeller conditioner
Equal angle: 2,376 kg
5,238 lb
Standard tires 11L-15 standard
31x13.5L 15 optional


Are wrenches required for adjusting? Roll pressure
YesRoll spacing
YesHeader tilt

Additional information

Date collected