Applicators for Kubota Round Balers

2024 - Selection Guide
(Applicator Part Numbers)

Hay preservative can be used to bale large round bales between 16% and 30% moisture. The kit is available with a 25-gallon tank which mounts on the tongue of the baler and holds enough preservative to treat 30 to 60 tons of hay.

Depending on your need, choose the new 300 series automatic system, an electronic system, or an economical manual control system.

Moisture Sensors for Round Balers

Automatic systems for round balers are equipped with two moisture sensing discs, one mounted on each of the baler side walls, sensing moisture across the width of the bale via conductivity. The sensors can accurately read crop moisture from 8% to 60%, covering a wide range of moisture levels.


Product Specs

All applicators come as complete kits designed to fit your specific baler, and consist of:

  • 25 Gallon Tank
  • 12 volt pumping system
  • All plumbing and wiring supplied
  • Your choice of control options

Click the link to see more info on the available control options or use the helpful chart below

Control Options for Round Balers

Comparison of Applicator Controls

Electronic Applicator 300 Series Automatic
Single Pump System X X
Control Box with Adjustable Dial X
iPad Display X
Built-in Flowmeter X
Automatic Application X
Moisture Sensing Capability X
Job Records by Field X
Calculates Baling Rate: Small Square Baler, Large Square Baler X
Hay Indicator Compatible X X


300 Series Automatic Control System

Round Balers


The 300 series automatic control system is a more compact and efficient applicator that accurately senses moisture on the go and adjusts the application of preservative to match the condition of the hay. This precision give the operator the exact amount of product required to keep their crop in great condition, without wasting product. The 300 Series applicator is controlled with an iPad* through a Bluetooth receiver, eliminating harnesses in the cab.

New improvements to the 300 Series Automatic Applicator include:

  • Single constant-pressure pump with pulsing solenoid that reacts quickly to changes in application rates
  • Improved flowmeter that works on a range of products
  • Smaller and more compact system that is easier to install and maintain

The applicator takes moisture and baling rate information from the two star wheel sensors on small square balers, and two moisture discs in the bale chamber on round balers, and the system will automatically apply the correct amount of product. The moisture, tonnage, and rates are all displayed on the screen, along with the volume used. A simple push of any Main Menu key pulls up a selection of other screens including adjustable settings and a Job Records screen. The system stores 63 jobs by date and time, number of tons baled, product used, and high and average moisture.

*iPad Mini or iPad 3rd Generation (2012) or newer, running the current iOS operating system or one version previous required for iPad option

Electronic Control Systems

Electronic Controls The electronic cab control is a solid state electronic pump control used for any large square, small square, or round baler. The control box can be mounted in the cab or on the fender, and once set the electronic control will hold the application rate constant and is adjusted by turning the dial on the control box.

Your hay is important. Make sure your preservative does what it says it will.

Find out more >>

Hay Indicator (Crop Eyes)


The hay indicator sensors see when hay enters the balers pick-up and activates the preservative application. When no crop is coming into the baler, the system will pause on its own, while being ready to apply when crop once again enters the baler.

Part# 474A - Pre-700 Series Automatic Applicator & Electronic Systems

Part #474C - 700 Series Automatic Applicator


Flow Meter


Part# 453

Digital Electronic Flow Meter is for use with any Harvest Tec preservative applicator
delivering between 40 and 500 pounds per hour. The flow meter reads the application rate in pounds per hour and total pounds used.

H2O Precision Moisture Sensor


The H2O Precision Moisture Sensor is a new moisture option for Small Square, Round and Large Square balers. Two discs or star wheels mount in the bale chamber and read moisture with the patented side-to-side technology. Allowing accurate readings up to 60% moisture on the round and large square balers, and up to 33% on small squares.

The H2O Precision Moisture Sensor is controlled with your Apple or Android smart phone or tablet via a hardwired connection and free app.

Part# 201RB - Round Balers

Part# 201SS - Small Square Balers

Part# 201LS - Large Square Balers


Transfer Pumps


To transfer Baler’s Choice Hay Preservative safely and easily from your storage container to your applicator tank, use any of the following transfer pumps:

Model 9214: For a rapid transfer rate of 14 gallons per minute, this 12-volt unit can get the job done quickly.

Model 9212: This standard output, 12-volt model, will transfer preservative at a rate of 4 gallons per minute.

Model 9213: This inexpensive hand transfer pump is ideal for transferring small amounts of preservative easily.


Dye Sprayer Marking System


The Dye Sprayer Marking System is a simple way to visibly mark the wet areas on your large square bales. Compatible with the 600 & 700 Series Automatic Applicator or moisture only system for any large square baler. The 3-gallon system is mounted near the bale chamber and when the adjustable high moisture alarm sounds, the system will spray a red-colored, food-grade dye on the exact location on the bale for a quick and easy reference.

Part# 030-0840 - 600 Series

Part# 030-0740DM - 700 Series


GPS Interface Kit


By incorporating the GPS into the Model 600 or 700 system the producer has the ability to create yield maps for their crops, allowing them to gain the knowledge needed to maximize productivity. The kit consists of a removable data storage card and GPS interface harness that is compatible with the Trimble 162 AgGPS, which is purchased separately from a Trimble dealer.

Part# 030-0780GPS - 700 Series

Part# 030-0880GPS - 600 Series

Automatic Applicator kits DO NOT include display

Made for iPad® running the current iOS operating system
or one version previous is required for iPad operation
*iPad is a trademark of Apple Inc., registered in the U.S. and other countries.

*Contact Your Local Kubota Dealer For Pricing*


Baler Model 300 Series Automatic Part # Electronic Part # Upgrade to 300 Automatic System Part#
BV4160, 4180, 5160, 4580 3464481C 4414481 3U64481C


Baler Style 300 Series Moisture Only Upgrade to Auto Applicator
Round Baler 030-300RB N/A
030-201RB (H2O Precision Moisture Kit) Contact Harvest Tec


Description Part Number
400 Series iPad Conversion Kit (Bluetooth Receiver) 030-4672B
iPad Mini Mounting Kit 030-2012MK
iPad Mini & Mounting Kit Combo (iPad Mini, mount, charger) 030-4670DK
Baler Mounted Moisture Tester 008-FX2000
Hay Indicators (Crop-Eyes) 030-0474A
Dye Marking System 030-0840
H2O Precision Moisture Kit Dye Marker 030-200DM
12V Electronic Transfer Pump (4 Gal/Min) 008-9212
12V Electronic Transfer Pump (15 Gal/Min) 008-9214
110V Electronic Transfer Pump (4 Gal/Min) 008-9215