DR Mini Tiller Roto-Hog User Manual
DR® ROTO-HOG™ Mini Tiller
SAFETY & OPERATING INSTRUCTIONS
DR Power Equipment
Serial No. ________________
Order No. ________________
Read and understand this manual and all instructions before operating this Tiller.
Toll-free phone: 1-800-DR-OWNER (376-9637)
Fax: 1-802-877-1213
Website: www.DRpower.com
Table of Contents
Chapter 1: Important Safety Considerations.......................................................................................................................... 3
Chapter 2: Setting up your DR ROTO-HOG Mini Tiller......................................................................................................... 6
Chapter 3: Operating Your DR ROTO-HOG Mini Tiller .......................................................................................................11
Chapter 4: Maintaining the DR ROTO-HOG Mini Tiller...................................................................................................... 14
Chapter 5: Troubleshooting.................................................................................................................................................. 18
Chapter 6: Parts Lists, Schematic Diagrams, and Warranty................................................................................................ 20
Conventions used in this manual
This indicates a hazardous situation, which, if not avoided, could result in death or serious injury.
This indicates a hazardous situation, which, if not avoided, could result in minor or moderate injury
This information is important in the proper use of your machine. Failure to follow this instruction could result in damage to
your machine or property.
.
Tip: This is a helpful hint to guide you in getting the most out of your DR ROTO-HOG Mini Tiller.
Tools Needed: This indicates you will need a special tool to perform a maintenance function on your Tiller.
NOTE: This information may be helpful to you.
We have done our utmost to ensure that your DR ROTO-HOG Mini Tiller will be one of the most trouble-free and satisfying
pieces of equipment you have ever owned. Please let us know of any questions you may have. We want to answer them as
quickly as possible. When you do call, please have your order number, or serial number handy. For technical assistance,
please visit our website at www.DRpower.com or call Toll-Free 1-800-DR-OWNER (376-9637) and one of our Technical
Support Representatives will be happy to help you. We also hope to hear from you on how much you like your new helper.
If you are ever unsure about an action you are about to take, don’t do it, visit our website at www.DRpower.com for help or
information.
DR Power Equipment reserves the right to discontinue, change, and improve its products at any time without notice or
obligation to the purchaser. The descriptions and specifications contained in this manual were in effect at printing.
Equipment described within this manual may be optional. Some illustrations may not be applicable to your machine.
2 DR® ROTO-HOG™ Mini Tiller
Chapter 1: Important Safety Considerations
We want you to enjoy years of safe and productive use from your DR ROTO-HOG Mini Tiller. We do not want you injured, so
please take a few moments to read the following instructions for safely operating your new Tiller.
Your DR ROTO-HOG Mini Tiller carries a prominent safety label (shown below) to remind you of important information while
you are operating the machine. Take a moment to study this label before
replace this label if it should become unreadable due to fading, or otherwise damaged during use of your DR ROTO-HOG
Mini Tiller.
you operate the machine. Please, immediately
Warning Label located on the Battery Box. #261871
Protecting Yourself and Those around You
Tragic accidents can occur if the operator is not alert to the presence of children. Children are often attracted to the Tiller and
the activity of tilling. Never assume that children will remain where you last saw them.
This tilling machine, can cut, and sever parts of your body if they become in contact with the moving Tines. Always take the
following precautions when operating the DR ROTO-HOG Mini Tiller:
• Only allow responsible individuals who have a thorough understanding of these instructions to operate the Tiller. Never
allow children to operate the machine.
• Always wear protective goggles or safety glasses with side shields while tilling to protect your eyes from possible foreign
objects thrown from the machine.
• Wear shoes with non-slip treads when using this machine. If you have safety shoes, we recommend wearing them. Do
not use the machine while barefoot or wearing sandals with exposed toes or heels.
• Avoid wearing loose clothing or jewelry, which can catch on the machine’s moving parts.
• We recommend wearing long pants and gloves while using this machine. Be sure the gloves fit properly and do not have
loose cuffs or drawstrings.
• Never place your hands, feet, or any part of your body near the Tines when starting the Engine or while the DR ROTO-
HOG Mini Tiller’s Engine is running.
• Keep children, other bystanders, and pets away from your work area at all times. Stop the Engine when another person or
pet approaches.
• Before and while pulling the machine backwards, look behind and down for small children and for secure footing.
• We recommend the use of ear protectors or earplugs rated for at least 20 dba to protect your hearing.
CONTACT US AT www.DRpower.com 3
Operating the Tiller Safely
• Clear the work area of objects that might jam or wrap around the Tines such as glass, large sticks, stones, metal objects,
wire, rope, and string-like materials. Use on these objects could damage the DR ROTO-HOG Mini Tiller and/or cause
injury.
• Do not touch the muffler and Engine when the machine is in use as they become very hot and can cause severe burns.
• The Engine should always be off before adjusting the Wheel Height or Drag Stake.
• Never, under any conditions, remove, bend, cut, fit, weld, or otherwise alter standard parts on the DR ROTO-HOG Mini
Tiller. This includes all shields and guards. Modifications to your machine could cause personal injuries and property
damage and will void your warranty.
• Do not operate the machine when under the influence of alcohol, drugs, or medication.
• Use the DR ROTO-HOG Mini Tiller only in daylight.
• Do not hurry or take things for granted when using the DR ROTO-HOG Mini Tiller. When in doubt about the machine or
your surroundings, stop the machine and take time to look things over.
• Do not use this machine around large roots and surface rocks that you cannot remove.
• Do not use this machine around underground pipes and wiring.
• When removing material from the Tines by hand, stop the Engine and remove the Spark Plug wire.
Safety with Gasoline-Powered Machines
Gasoline is a highly flammable liquid. Gasoline also gives off flammable vapor that is easy to ignite and cause a fire or
explosion. Never overlook the hazards of gasoline and always follow these precautions:
• Never run the DR ROTO-HOG Mini Tiller Engine in an enclosed area or without proper ventilation as the exhaust from
the Engine contains carbon monoxide, this is an odorless, tasteless, and deadly poisonous gas.
• Store all fuel and oil in containers specifically designed and approved for this purpose and keep away from heat, open
flame, and out of the reach of children.
• Mix the oil and gasoline outdoors and then fill the Fuel Tank outdoors with the Engine off; allowing the Engine to cool
completely. Do not handle gasoline if you or anyone nearby is smoking, or if you are near anything that could cause it to
ignite or explode. Replace the Fuel Tank and Fuel Container Caps securely.
• If you spill gasoline, do not attempt to start the Engine. Move the machine away from the area of the spill and avoid
creating any source of ignition until the gas vapors have dissipated. Wipe up any spilled fuel to prevent a fire hazard and
properly dispose of the waste.
• Allow the DR ROTO-HOG Mini Tiller Engine to cool completely before storing in any enclosure. Never store the machine
with fuel in the tank or with fuel in a container near an open flame or spark such as a water heater.
• Never make adjustments or repairs with the Engine running. Before making an adjustment or repair, shut off the DR
ROTO-HOG Mini Tiller Engine, wait five (5) minutes to cool, then disconnect the spark plug wire and keep the wire away
from the spark plug to prevent accidental starting.
• Never check for an ignition spark with the Spark Plug or Spark Plug wire removed. Always use an approved spark tester.
• To reduce fire hazard and keep the Engine from overheating, keep the Engine and Muffler area free of debris or any other
combustible material.
• Never operate the Engine without the Muffler. Inspect the Muffler periodically and replace if necessary.
• Never operate the Engine with the Air Filter or Cover over the Carburetor air intake removed, except for adjustment.
Removal of such parts could create a fire hazard. Do not use flammable solutions to clean Air Filter.
• Always check Fuel Lines and fittings frequently for cracks or leaks, replace if necessary.
• Replace rubber Fuel Lines and Grommets when worn or damaged, but do not use over five (5) years.
4 DR® ROTO-HOG™ Mini Tiller
Safe operation of the DR ROTO-HOG Mini Tiller is necessary to prevent or minimize the risk of minor or moderate injury
Unsafe operation can create a number of hazards for you. Always take the following precautions when operating this machine:
.
• The DR ROTO-HOG Mini Tiller is a powerful tool and not a plaything. When using this machine, exercise extreme
caution at all times. The design of this machine is to till soil. Do not use it for any other purpose.
• The operator or user of the DR ROTO-HOG Mini Tiller is responsible for accidents or hazards occurring to other people,
their property, and themselves.
• In an emergency, to quickly stop the machine, simply release the Throttle Lever and shut off the Engine.
• Do not transport the DR ROTO-HOG Mini Tiller from one place to another with the Engine running.
• If the machine should make an unusual noise or vibration, shut off the DR ROTO-HOG Mini Tiller Engine. Vibration is
generally a warning of trouble. Wait five (5) minutes for the DR ROTO-HOG Mini Tiller Engine to cool, disconnect the
Spark Plug wire and then inspect the machine for clogging, damaged Tines, or loose Engine mounting bolts. Clear any
obstructions and repair and/or replace damaged parts.
• Always keep the machine in good safe operating condition. Always make certain nuts and bolts are tight and always use
the supplied self-locking hardware. Do not use substitute hardware.
• Always shut off the DR ROTO-HOG Mini Tiller Engine, wait five (5) minutes to cool, and disconnect the spark plug wire
before attempting to clear any obstructions.
• If the DR ROTO-HOG Mini Tiller Engine should stall, raise the Tines out of the soil by pushing down on the Handlebars.
Never squeeze the Throttle Lever when the Tines are already in the ground.
• Never leave the DR ROTO-HOG Mini Tiller unattended with the Engine running.
Handling the Battery Safely
ELECTRICAL HAZARD: PREVENT FIRE
• Never modify the DR ROTO-HOG Mini Tiller’s electrical system. Modifications could ruin the electrical system as well as
cause a fire, resulting in serious injury.
• Using the wrong type of Battery or Charger could cause a fire or explosion, resulting in serious injury. Use the 12-volt
Charger supplied with your machine.
• Use the Charger only in dry locations. Avoid contact with water.
• Only adults should handle the Battery. It contains sulfuric acid (an electrolyte).
• Never allow children to charge the Battery. The electricity involved in charging the Battery could cause severe injury.
• Examine the charger, its connectors, and the Battery for excessive wear or damage each time you charge the Battery. If
you see any excessive wear or damage, do not use the Charger or the Battery, replace them.
• Never lift or carry the Battery by its cable. This can damage the Battery and possibly start a fire, resulting in serious injury.
Lift and carry the Battery only by its case.
• Do not short circuit the Battery, this may cause a fire or explosion.
No list of Warnings and Cautions can be all-inclusive. If situations occur not covered by this manual, the operator must apply
common sense and operate the DR ROTO-HOG Mini Tiller in a safe manner. Visit our website at www.DRpower.com or call
1-800-DR-OWNER (376-9637) for assistance.
A Note to All Users
Under California law, and the laws of some other states, you are not permitted to operate an internal combustion Engine using
hydrocarbon fuels without an Engine Spark Arrester. This also applies to operation on US Forest Lands. We provide all DR
ROTO-HOG Mini Tillers shipped to California and Washington State with Spark Arresters. Failure of the owner/operator to
maintain this equipment in compliance with state regulations is a misdemeanor under California law and may be in violation of
other state and/or Federal regulations. Contact your local Fire Marshal, Forest Service, State Park Association, or the
appropriate State organization for specific information in your area.
CONTACT US AT www.DRpower.com 5
Chapter 2: Setting up your DR ROTO-HOG Mini Tiller
This chapter outlines a few simple steps you will need to follow to set up your new machine before you use it. It may be
helpful to familiarize yourself with the controls and features on your new machine by reviewing Figure 1 on the following page
before beginning the steps outlined in this chapter. For technical assistance, please visit our website at www.DRpower.com
and one of our Technical Support Representatives will be happy to help you.
DR ROTO-HOG Mini Tiller Specification Sheet
Engine Viper 2-Cycle, 43cc, Electric Start
Fuel Tank Capacity 36 ounces
Fuel Type Unleaded regular gas
Oil/Gas Ratio 50:1 (2.6 ounces per gallon)
Oil Type 2-Cycle Engine Oil
Spark Plug NGK BM6A or Champion CJ8
Spark Plug Gap .028"
Transmission Centrifugal Clutch and Gear Drive
Gear Ratio 32:1
Tilling Width 6" minimum to 10" maximum
Tilling Depth 10" maximum
Tine Speed 250 RPM
Wheel Size 1.375 x 7.0" diameter
Machine Weight 42 lbs.
Machine Size 23"L x 20"W x 20"H
Shipping Size 16"H x 17"W x 12"D
Shipping Weight 45 lbs.
6 DR® ROTO-HOG™ Mini Tiller
DR ROTO-HOG Mini Tiller Controls and Features
NOTE: The model shown in Figure 1 may look slightly different from your machine.
Throttle Lever
Manual Recoil
Start Handle
Choke Lever (rear of Air Filter)
Air Filter
Electric-Starter Key Switch
Connector for Battery Charger
Primer Bulb
Battery Connection
VIPER 43cc 2-Cycle Engine
Manual Venting Gas Cap
Fuel Tank
Hood
Tines
CONTACT US AT www.DRpower.com 7
Figure 1
Unpacking and Assembling the Machine
Your DR ROTO-HOG Mini Tiller shipped in one carton, completely assembled except for the Handlebars and Battery
connection.
Parts Supplied in Shipping Carton:
• DR ROTO-HOG Mini Tiller
• Upper Left Handlebar
• Upper Right Handlebar
• Middle Handlebar
• Battery Charger
• Safety
&
Operating Instructions Manual
• Hardware Bag:
- (4) T-Handle Nut
- (4) Curved Washer
- (4) Handle Clamp Bolt
- (2) Ignition Key
Upper Right Handlebar
Handle Clamp Bolt
(4 places)
Throttle Cable
Upper Left Handlebar
Curved Washer
(4 places)
T-Handle Nut
(4 places)
Middle Handlebar
Lower Handlebar
Stabilize the shipping carton on a flat ground surface before attempting to unpack and assemble the machine. Do not
place the machine on a bench or table where it can fall and cause personal injury or damage the machine.
1. Carefully lift the DR ROTO-HOG Mini Tiller out of the carton and set the machine upright with the Tines and Wheels on a
level surface.
2. Remove the Hardware Bag from the Shipping Carton.
3. Remove any packing material from the machine and cut the Ties holding the Handlebar pieces to the Tiller assembly.
NOTE: Use care with the Upper Right Handlebar so as not to kink the Throttle Cable; it is pre-attached to the Engine.
4. Using two (2) T-Handle Nuts, two (2) Handle Clamp Bolts and two (2) Curved Washers, assemble the Middle Handlebar
to the Lower Handlebar already attached to the machine (Figure 2).
NOTE: You can install the Middle Handlebar in either of two (2) positions, one high, and one low. DO NOT over tighten the T-
Handle Nuts.
Figure 2
8 DR® ROTO-HOG™ Mini Tiller
5. Attach the Upper Right and Left Handlebars to the Middle Handlebar using the remaining two (2) T-Handle Nuts, two (2)
Handle Clamp Bolts, and two (2) Curved Washers (Figure 2 on page 8). DO NOT over tighten the T-Handle Nuts.
6. The Drag Stake shipped with its pointed end facing upwards. Remove the Detent Pin, turn the Drag Stake around and
direct the point in the downward position facing towards the Tines, and then reinsert the Detent Pin (Figure 3).
7. Plug the white plastic connector from the Battery into the mating plastic receptacle under the Battery Box (Figure 4).
NOTE: Make sure to remove the Ignition Key from the Ignition Switch before connecting the wiring in the Battery Box.
9. Do not discard your packaging material until you are fully satisfied with your new DR ROTO-HOG Mini Tiller.
Battery
Charger
Mating
Connector
Drag Stake Tip
pointed forward.
Detent Pin
Connector from
Battery plugged in.
Figure 3
Figure 4
Charging the Battery
1. Make sure the white plastic connector on the Battery Box is securely connected.
2. Plug the three-prong connector from the Charger into its mating connector on the side of the Battery Box (Figure 4).
3. Plug the other connector from the Charger into a standard 110-120V-outlet receptacle.
• Typically, the Battery takes between 6 and 8 hours to fully charge. The Battery is fully charged when the LED light on
the Charger turns GREEN. The Battery does not have a “memory”; so don’t worry about overcharging the Battery or
charging it too often.
• Once the Battery is charged, pull the plug from the wall outlet and then unplug the Charger from the Battery Box.
• Store the Charger in its plastic shipping bag in a dry location.
• The Battery will maintain a charge in the DR ROTO-HOG Mini Tiller when the Engine is running.
• Do not try to start the Engine while the Battery is charging, this could damage the Engine Starter and the Battery.
• Do not spray water on or near the Battery Box as this may damage the components.
CONTACT US AT www.DRpower.com 9
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