DR 16.5 Quick start guide

MODELS:
16.5 Self-Feeding Chipper
21.0 Self-Feeding Chipper
DR SELF-FEEDING CHIPPER
SAFETY & OPERATING INSTRUCTIONS
Serial No.
Order No.
Read and understand this manual and all instructions before operating or servicing this DR SELF-FEEDING CHIPPER.
Original Language
DR Power Equipment
Toll-free phone: 1-800-DR-OWNER (376-9637)
Fax: [phone]
Website: www.DRpower.com

2DR®SELF-FEEDING CHIPPER
This indicates a hazardous situation, which, if not avoided, could result in death or serious injury.
Table of Contents
Chapter 1: General Safety Rules....................................................................................................................... 3
Chapter 2: Setting Up the DR SELF-FEEDING CHIPPER ............................................................................... 9
Chapter 3: Operating Your DR SELF-FEEDING CHIPPER ........................................................................... 19
Chapter 4: Maintaining the DR SELF-FEEDING CHIPPER........................................................................... 25
Chapter 5: Troubleshooting ........................................................................................................................... 38
Chapter 7: Parts List and Schematic Diagrams............................................................................................. 41
Conventions used in this manual
Serial Number and Order Number
A Serial Number is used to identify your machine and is located on the Serial Number Label on your machine. An Order Number
is used to check and maintain your order history and is located on the upper left portion of your packing slip. For your
convenience and ready reference, enter the Serial Number and Order Number in the space provided on the front cover of this
manual.
Additional Information and Potential Changes
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.
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.
This indicates a hazardous situation, which, if not avoided, could result in minor or moderate injury.
This indicates a hazardous situation, which, if not followed, will result in death or serious injury.

CONTACT US AT www.DRpower.com 3
Chapter 1: General Safety Rules
Labels
Your DR SELF-FEEDING CHIPPER carries prominent labels as reminders for its proper and safe use. Shown below are copies of
all the safety and operation labels that appear on the equipment. Take a moment to study them and make a note of their location
on your DR SELF-FEEDING CHIPPER as you assemble and before you operate the unit. Replace damaged or missing safety and
operation labels immediately.
#
241801
#
241851
#
242321
Read this Safety & Operating Manual before you use the SELF-FEEDING Chipper. Become familiar with the operation and
service recommendations to ensure the best performance from your machine.
Thoroughly inspect the area in which you will be working and remove all foreign objects. Look for Rope, Wire, ECT., and
remove these objects before chipping. Inserting these objects into the chipper hopper could damage the machine and/or
cause injury.
This is a high-powered machine, with moving parts operating with high energy at high speeds. You must use proper clothing
and safety gear when operating this machine to prevent or minimize the risk of severe injury. This machine can crush, grind,
cut and sever parts of your body it they enter the inlet or discharge area of your chipper.

4DR®SELF-FEEDING CHIPPER
#
241991
#
241811
#242041
#
241821
#
241841
#
242001
#
241831
#242331 (electric start model only)
#
242611
(
Roa
d
-Tow Models onl
y)
#137581

CONTACT US AT www.DRpower.com 5
Protecting Yourself and Those Around You
Safety for Children and Pets
This is a high-powered machine, with moving parts operating with high energy at high speeds. You must operate the machine
safely. Unsafe operation can create a number of hazards for you, as well as anyone else in the nearby area. Always take the
following precautions when using this machine:
Always wear protective goggles or safety glasses with side shields while chipping to protect your eyes from possible thrown
debris.
Avoid wearing loose clothing or jewelry, which can catch on moving parts or the material fed into the chipper hopper.
We recommend wearing gloves while chipping. Be sure your gloves fit properly and do not have loose cuffs or drawstrings.
Wear shoes with non-slip treads when using your chipper. If you have safety shoes, we recommend wearing them. Do not
use the machine while barefoot or wearing open sandals.
Wear long pants while operating the DR SELF-FEEDING Chipper.
Use ear protectors or ear plugs rated for at least 20 dba to protect your hearing.
Never allow people who are unfamiliar with these instructions to use the chipper. Allow only responsible individuals who are
familiar with these rules of safe operation to use your machine.
Never place your hands, feet, or any part of your body in the chipper hopper, discharge opening, or near or under any moving
part while the machine is running. Keep area of discharge clear of people, animals, buildings, glass, or anything else that will
obstruct clear discharge, cause injury, or damage. Wind can also change discharge direction, so be aware. If it becomes
necessary to push material into the chipper hopper, use a small diameter stick, not your hands.
Keep bystanders 100 feet away from your work area at all times. Wood chips exit the chipper at great speeds. To be safe, do
not operate the machine near small children or pets, and never allow children to operate the chipper. Stop the engine when
another person or pet approaches.
Never use the machine without ensuring that all guards and shields are in place, including the chipper hopper, discharge
chute and blowback shield.
Do not operate the engine with the air cleaner or the carburetor air intake cover removed. Removal of such parts could create
a fire hazard. Do not use flammable solutions to clean the air filter.
Always operate the machine from the operator zone (see chapter 4). Never pass or stand on the discharge side of the
machine when the engine is running or the flywheel is turning.
Never try to pick up, move, or transport the machine while the engine is running or the flywheel is turning.
The muffler and engine become very hot and can cause a severe burn; do not touch.
Clear the area of objects such as wire and rope, etc. Inserting these objects into the chipper hopper could damage the
flywheel and/or cause injury.
Never, under any conditions, remove, bend, cut, fit, weld, or otherwise alter standard parts on the DR SELF-FEEDING
Chipper. This includes all shields and guards. Modifications to your machine could cause personal injuries and property
damage and will void your warranty.
Tragic accidents can occur if the operator is not alert to the presence of children and pets. Children are often attracted to the
machine and the chipping activity. Never assume that children will remain where you last saw them. Always follow these
precautions:
Keep children and pets at least 100 feet from the working area and under the watchful care of a responsible adult.
Be alert and turn the machine off if children or pets enter the work area.
Never allow children to operate the DR SELF-FEEDING Chipper.

6DR®SELF-FEEDING CHIPPER
Safety with Gasoline - Powered Machines
Gasoline is a highly flammable liquid. Gasoline also gives off flammable vapor that can be easily ignited and cause a fire or
explosion. Never overlook the hazards of gasoline. Always follow these precautions:
Never run the engine in an enclosed area or without proper ventilation as the exhaust from the engine contains carbon
monoxide, which 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 and open
flame, and out of the reach of children.
Replace rubber fuel lines and grommets when worn or damaged and after 5 years of use.
Fill the gasoline tank outdoors with the engine off and allow the engine to cool completely. Don't handle gasoline if you or
anyone nearby is smoking, or if you're near anything that could cause it to ignite or explode. Reinstall the fuel tank Cap and
fuel container cap 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 engine to cool completely and empty the collector box before storing the DR Leaf and Lawn Vacuum in any
enclosure. Remember, decomposing material can generate heat and start a fire. Never store the machine with gas in the
tank or a fuel container, near an open flame or spark such as a water heater, space heater, clothes dryer or furnace.
Never make adjustments or repairs with the engine running. Shut down the engine, disconnect the spark plug wire, keeping it
away from the spark plug to prevent accidental starting, wait 5 minutes before making adjustments or repairs.
Never tamper with the engine’s governor setting. The governor controls the maximum safe operation speed and protects the
engine. Over-speeding the engine is dangerous and will cause damage to the engine and to the other moving parts of the
machine. If required, see your authorized dealer for engine governor adjustments.
Keep your hands and combustible substances away from the engine when it is hot and clean the engine area after each use.
To reduce fire hazard, keep the engine cooling fins and muffler area free of debris build-up such as leaves, grass, oil, grease or
any other combustible material.
Never cover the machine while the muffler is still hot.
Do not operate the engine with the air cleaner or the carburetor air intake cover removed, except for adjustment. Removal of
such parts could create a fire hazard.
Do not use flammable solutions to clean the air filter.
The muffler and engine become very hot and can cause a severe burn; do not touch.

CONTACT US AT www.DRpower.com 7
Before towing, be certain the DR SELF-FEEDING Chipper is correctly and securely attached to the towing vehicle and the
safety chains are in place. Leave slack in the chains to allow for turning.
Never allow anyone to ride on the DR SELF-FEEDING Chipper.
Never transport anything on the machine.
Obey local, state, and federal regulations when you tow the chipper on public roads and highways.
Note: Some states may require the machine to be registered with the state department of motor vehicles.
Allow for added length in driving situations, e.g., when turning, parking, and crossing intersections.
Adjust your towing speed for terrain and conditions. Do not exceed 45 mph while towing the chipper.
Towing the machine can affect handling of the tow vehicle:
The chipper might track at an angle to the tow vehicle.
The machine can turn tighter than the tow vehicle.
Never back up the tow vehicle with the chipper attached. The machine can jackknife, causing damage to itself and/or the
tow vehicle.
Long distance towing is not recommended. The DR SELF-FEEDING Chipper does not have springs to absorb road shock and
will tend to bounce on rough roads. Extended towing can cause unnecessary wear.
Road Towing Safety (For Road-Tow Models Only)
General Safety
Operating this chipper safely is necessary to prevent or minimize the risk of death or serious injury. Unsafe operation can create a
number of hazards for you. Always take the following precautions when operating this chipper:
Keep in mind that the operator or user is responsible for accidents or hazards occurring to other people, their property, and
themselves.
Your DR SELF-FEEDING Chipper is a powerful tool, not a plaything. Exercise extreme caution at all times. The design of this
machine is to chip wood. Do not use it for any other purpose.
Know how to stop the chipper quickly; see chapter 3.
Operate this machine on a level surface only. Never operate your unit on a slippery, wet, muddy, or icy surface. Exercise
caution to avoid slipping or falling.
Keep your face and body back from the chipper hopper to avoid accidental bounce back of any material.
When feeding material into the chipper hopper, be extremely careful that pieces of metal, rocks, or other foreign objects are
not included. Personal injury or damage to the machine could result.
Never allow an accumulation of processed material to build up in the discharge area as this will prevent proper discharge and
can result in kickback from the chipper hopper.
Always stop the engine when moving the DR SELF-FEEDING Chipper.
Keep combustible substances away from the engine when it is hot.
Never cover the machine while the muffler is still hot.
See manufacturer’s instructions for proper operation and installation of accessories. Only use accessories approved by DR
Power Equipment.

8DR®SELF-FEEDING CHIPPER
California Proposition 65:
Engine exhaust and some of its constituents are known to the State of California to cause cancer, birth defects, and other
reproductive harm.
This product contains or emits chemicals known to the State of California to cause cancer, birth defects, and other
re
p
roductive harm.
General Safety Continued
California Proposition 65
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. All DR SELF-FEEDING
CHIPPERS shipped to California, New Mexico and Washington State are provided with spark arresters. Failure of the owner or
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 or forest service for specific information in your
area.
No list of warnings and cautions can be all-inclusive. If situations occur that are not covered by this manual, the operator must
apply common sense and operate this DR SELF-FEEDING Chipper in a safe manner. Contact us at www.DRpower.com or call 1-
800-DR-OWNER (376-9637) for assistance.
If the cutting mechanism strikes a foreign object or if your machine should start making an unusual noise or vibration, shut
down the engine, wait for all moving parts to come to a complete stop (the flywheel will continue rotating for a while after the
engine is shut down), disconnect spark plug wire, keeping it away from the spark plug to prevent accidental starting, then wait
5 minutes before inspecting for clogging or damage. Vibration is generally a warning of trouble. Clean and repair and/or
replace damaged parts.
Never tamper with safety devices. Check their proper operation regularly.
Stay alert for hidden hazards or traffic. Never carry passengers on your machine.
Never overload or attempt to chip material beyond the manufacturer’s recommendation; see chapter 3. PERSONAL INJURY
or damage to the machine could result.
While using the DR SELF-FEEDING Chipper, don't hurry or take things for granted. When in doubt about the equipment or
your surroundings, stop the machine and take the time to look things over.
Never operate the machine when under the influence of alcohol, drugs, or medication.
Use the machine only in daylight.
Keep all nuts and bolts tight and keep the equipment in good operating condition.

CONTACT US AT www.DRpower.com 9
Chapter 2: Setting Up the DR SELF-FEEDING CHIPPER
This chapter outlines assembly and 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 of your DR SELF-FEEDING CHIPPER as shown in Figure 1 before
beginning these procedures. If you have any questions at all, please feel free to contact us at www.DRpower.com or call our
Customer Service Representatives at our toll free number: 1-800-DR-OWNER (376-9637).
DR SELF-FEEDING CHIPPER Controls and Features
Key
Switch
Oil Drain
Discharge
Chute
Figure 1
Blow Back
Shield
A
ccess Cove
r
f
or Chipper
Knife Check
Belt Guard
Choke Lever
Fuel Fill
Cap
Belt
Tensioner
Tongue
A
ssembly
Wheel
A
ssembly
Fuel
Shut-off
Throttle
Lever
On/Off Key
Switch
Starter
Cord
Hopper
A
ssembly
Battery
Chipper Knife
Wear Plate
Oil Fill/Dipstick
Fuel Fill Cap
Pro Engine
Oil Drain
Plu
g
Hopper Removed
21.0 Yard-Tow
Model Shown

10 DR®SELF-FEEDING CHIPPER
Specifications
Models 16.5 Manual and Electric Start Models 21.0
Engine Briggs & Stratton (See Engine Manual for Engine
Specifications)
Briggs & Stratton Electric Start (See Engine Manual
for Engine Specifications)
Series 1650 2100
Chipping Capacity 4-3/4" Diameter 5-3/4" Diameter
Number of
Chipper Knives
1 1
Chipper Knife Size 6-1/4" x 1-1/4" x 9/32" 7-1/4" x 1-1/4" x 9/32"
Chipper Knife
Material
Heat Treated Tool Steel Heat Treated Tool Steel
Adjustable Wear
Plate
Yes Yes
Chipper Flywheel 17-3/4" Diameter x 5/8" Thick 20" Diameter x 5/8" Thick
Flywheel Weight 50 Lbs 62.5 Lbs
Chipper Knife Tip
Speed
128 mph 144 mph
Wheel Size 4.10/3.50-6 Pneu. (Yard-Tow Models)
4.80/4.00-8 Pneu. (Road-Tow Models)
4.10/3.50-6 Pneu. (Yard-Tow Models)
4.80/4.00-8 Pneu. (Road-Tow Models)
Axle 3/4" Diameter (Yard-Tow Models)
1" Diameter w/Welded Angle (Road-Tow Models)
3/4" Diameter (Yard-Tow Models)
1" Diameter w/Welded Angle (Road-Tow Models)
Hopper Material 10 GA Neck, 16 GA Hopper, Steel 10 GA Neck, 16 GA Hopper, Steel
Frame Material 12 GA Steel 12 GA Steel
Hopper Opening
at Top
17" x 27" 19" x 30-1/2"
Assembly
Parts supplied in Shipping Container:
DR SELF-FEEDING CHIPPER
Hopper Assembly
Lights, Light Brackets and Wiring (Road-Tow models only)
Tow Bar Assembly
Extended Top-Discharge Chute (if ordered, see Chapter 6 “Chipper
Accessories”)
Parts Box containing (Figure 2):
Discharge Chute
Safety Glasses
Safety &Operation Instructions Manual
Engine Owner’s Manual
Hardware Package (Figure 3 and Table on next page)
Discharge
Chute
Safety
Glasse
s
Safety &
Operating
Instructions
Manual
Hardware
Packa
g
e
Engine
Owners
Manual
Fi
g
ure 2

CONTACT US AT www.DRpower.com 11
Hardware Package Parts:
Item # Part # Description Qty
1 ........... 24197.......Bolt, 5/16-18 x 4-1/2"..................................2
2 ........... 14313....... Nylon Locknut, 5/16-18 ..............................8
3 ........... 15448 .......Nylon Locknut, 3/8-16 ................................6
4 ........... 11152 .......Bolt, 3/8-16 x 1"...........................................5
5 ........... 11241....... Flat Washer, 5/16" ......................................6
6 ........... 16679 .......Bolt, 5/16-18 x 3/4.......................................4
7 ........... 16003 ....... Knife Gap Gauge .........................................1
8 ........... 37459 ....... U-Bolt...........................................................1
9 ........... 14340 .......Nylon Locknut, 1/4-20 ................................2
10 ......... 14906 ....... Cable Tie......................................................12
11 ......... 14605 .......Bolt, HCS, 5/16-18 x 1, Gr5.........................2
12 ......... 14292 .......Hitch Plate, Tow Bar ...................................1
Note: You may have extra hardware that is not needed for your model.
Installing the Tow Bar for the Yard-Tow Model
Note: For easier installation, keep the machine on the pallet and supports until the
Tow Bar is installed.
Tools Needed:
7/16 Wrench
Two 9/16" Wrenches
Two 1/2" Wrenches
1. Position the Tow Bar under the Base and secure the front Bracket with two
3/8-16 x 1" Bolts and Locknuts using two 9/16" Wrenches (Figure 4).
2. Secure the Bracket at the rear of the Tow Bar to the Axle with a U-Bolt and
two Locknuts using a 7/16" Wrench. (Figure 5).
3. Attach the Hitch Plate to the Tow Bar with Two 5/16-18 x 1" Bolts and
Locknuts using two 1/2" Wrenches (Figure 6).
1
Figure 3
3
6
4
2
7
8
9
10
5
11
12
U-Bolt and
Locknuts
Figure 5
Tow Bar
Bracket
A
xle
Bolt and
Locknut
Figure 4
Tow Bar
Base
Tow Bar
Figure 6
Hitch Plate
5/16-18 x 1" Bolts
and Locknuts

12 DR®SELF-FEEDING CHIPPER
Installing the Tow Bar and Lights for the Road Tow Model
Note: For easier installation, keep the machine on the pallet and supports until the
Tow Bar is installed.
Tools and Supplies Needed:
7/16 Wrench
Two 1/2" Wrenches
Two 3/4" Wrenches
Wire strippers/Cutters
Stiff Wire with Hooked End
Cable Ties (Supplied with machine)
1. Insert the ends of the Yellow/Brown and Green/Brown Wires of the
Wire Harness into the Tongue Assembly and down into the Tow Bar (Figure 7)
until they reach the large hole (Figure 8).
2. Pull the ends of the wires through the large Hole by using a stiff wire
with a small hook formed at the end.
3. Continue pulling the Wires through leaving approximately two feet of
the Plug end extended beyond the front of the Tongue assembly.
4. Position the Tow Bar under the Base and secure the front Bracket with
3/8-16 x 1" Bolts and Locknuts using two 9/16" Wrenches (Figure 9).
5. Secure the rear of the Tow Bar to the Axle with 3/8-16 x 1" Bolts and
Locknuts using two 9/16" Wrenches (Figure 10).
6. Position the Yellow/Brown Wires along the left side of the axle and up
to the light location over the Fender (Figure 11).
7. Position the Green/Brown Wire along the right side of the axle and up
to the Light location over the Fender.
8. Secure the Wires under the Frame with Cable Ties at the four places
shown.
Figure 11
Cable Ties
Yellow/
Brown
Wire
Wires
Bolt and
Locknut
Figure 10
Tow Bar
Rear Bracket
Road Tow
A
xle
Bolt and
Locknut
Figure 9
Tow Bar
Base
Wires
Figure 8
Tow Bar
Hook Tool
Larger Hole
Figure 7
Wires
Tow Bar

CONTACT US AT www.DRpower.com 13
9. Mount a Light Bracket to both sides of the Chipper with two 5/16-18 x 3/4"
Bolts and Locknuts each using two 1/2 Wrenches (Figure 12).
10. Attach the Lights to the mounting brackets with the Locknuts that are
included on the Lights using a 7/16" Wrench.
Note: The Side Light of each Light Assembly must face to the outside of the Chipper
with the clear Lens facing down.
11. Secure the Wires to the Light Brackets with a Cable Tie.
12. Cut the wires with Wire Cutters near the top of the Light allowing enough
extra Wire for installation into the back of the Light after Wires are stripped
in the next step.
13. Strip (remove) 1/2" of insulation from the ends of the Yellow/Brown wires
and Green/Brown wires with Wire Strippers and twist the individual wire
ends to aid in installation.
14. At the left side of the Chipper, insert the Yellow Wire into the top left hole in
the back of the light socket. Insert the Brown Wire into the top right hole.
Note: The wires are retained in the light socket holes by spring-loaded connectors.
15. At the left side of the Chipper, insert the Green Wire into the top left hole in
the back of the light socket. Insert the Brown Wire into the top right hole.
16. Remove 1" of insulation from the end of the White (Ground) Wire with the
Wire Strippers (Figure 13).
17. Loosen a Trailer Hitch Bolt, wrap the White (Ground ) Wire around the Bolt,
and then re-tighten with two 3/4" wrenches.
18. Secure the Wires to the Tongue Assembly between the two large Bolts to
ensure they will not get caught between the Tongue and Ball of the Tow
vehicle (Figure 14).
19. Secure the colored and white wires together with a couple of Cable Ties.
Figure 14
Zip Tie
Tongue
A
ssembly
Light Plug
Zip Ties
Figure 13
Ground Wire
Hitch Bolt
Figure 12
Tail Light
Yellow/Brown
Wires
Light
Mounting
Bracket
Bolt and
Locknut
Light
Mounting
Hardware
Cable
Tie
Side Light

14 DR®SELF-FEEDING CHIPPER
Attaching the Hopper Assembly
Note: We recommend that you have someone help you lift the Hopper in place and
support it until it is secured to the Chipper.
Tools Needed:
Two 1/2" Wrenches
For 16.5 Models:
1. Remove and discard the three Shipping Nuts from the Housing Bolts
with two 1/2" Wrenches, but leave the Housing Bolts in place (Figure 15a)
2. Position the Hopper Assembly onto the Housing Support and Stud
(Figure 16a) and secure the upper Bolts to the Hopper Assembly with two 5/16-
18 Locknuts and Washers using two 1/2" Wrenches.
3. Secure the lower right Bolt to the Hopper Assembly with a 5/16-18
Locknuts (no Washer) using two 1/2" Wrenches.
4. Install a 5/16-18 Locknut and Flat Washer to the lower Housing Stud
and secure with a 1/2" Wrench.
For 21.0 Models:
1. Remove and discard the Shipping Nut from the Housing Bolt with two
1/2" Wrenches, but leave the Housing Bolt in place (Figure 15b.)
2. Position the Hopper Assembly onto the Housing Support and the three
Housing Studs (Figure 16b) and secure the Bolt to the Hopper Assembly with a
5/16-18 Locknut and Washer using two 1/2" Wrenches.
3. Install three 5/16-18 Locknuts and Flat Washers to the three Studs and
tighten with a 1/2" Wrench.
Figure 16a: 16.5
Hopper
Chipper
A
ssembly
Bolt, Locknut and
Washer (Upper
Left and Right)
Spacer
Bolt and Locknut
(Lower Right)
Locknut
(Lower Left)
Bolt and
Locknut
Figure 15b: 21.0
Housing
Studs
Housing
Support
Bolts and
Locknuts
Figure 15a: 16.5
Housing
Stud
Housing
Support
Always secure the Support Leg in the up (transport) position before towing to
prevent damage to the machine.
Figure 16b: 21.0
Hopper
Chipper
A
ssembly
Locknut and Washer
(Two on other side of
Hopper Also)
Bolt, Locknu
t
and Washer

CONTACT US AT www.DRpower.com 15
Figure 20
Negative
Battery
Cable
Battery
Attaching the Discharge Chute
Tools Needed:
Two 1/2" Wrenches
1. Position the Discharge Chute facing away from the Hopper as shown and
secure with two 4-1/2" long 5/16-18 Bolts, Washers (one Washer on Bolt
side and one on Locknut side) and Locknuts using two 1/2" Wrenches
(Figure 17).
Positioning the Support Leg from Towing to Operating Position
1. Pull the Hitch Clip from the Pin and pull the Pin from the Support Leg and
Tow Bar (Figure 18).
2. Rotate the Support Leg to the down (operating) position, align the holes in
the Tow Bar and Leg, reinstall the Pin and secure with the Hitch Clip (Figure
19).
Connecting the Battery Cable (Electric Start)
We ship the electric-start DR SELF-FEEDING CHIPPER with the negative
terminal battery cable disconnected. This prevents the battery from discharging
during shipment. Before using your electric start DR SELF-FEEDING CHIPPER,
you must connect the battery cable.
Tools Needed:
5/16" Wrench
Phillips Head Screwdriver
1. Connect the Negative Battery Cable onto the Negative Terminal Lug of the
Battery with the existing Bolt, Washer and Nut using a 5/16" Wrench and a
Phillips Head Screwdriver (Figure 20).
Discharge
Chute Bolts
,
Washer
s
and Locknut
s
Hopper
Figure 17
Chipper
Housing
Tow Bar
Figure 19
Support Leg
Pin w/Hitch
Clip
Figure 18
Support Leg
Pin w/Hitch
Clip
Tow Bar

16 DR®SELF-FEEDING CHIPPER
You must add oil before starting the engine. This machine is shipped without oil. Traces of oil may be in the reservoir from
factory testing, but you must add oil before starting the engine. Fill the reservoir slowly checking the dipstick frequently to
avoid overfilling.
To get an accurate reading when checking the oil level:
- The machine should be on a level surface.
- The dipstick should be pushed all the way down and turned a quarter turn clockwise (16.5) or screwed fully in (21.0 Model)
to ensure an accurate oil level reading.
Adding Engine Oil and Gasoline
Capacities
Engine See engine owners manual
Fuel Tank Unleaded gasoline, 4 US quarts (3.79 L)
Tip: To avoid confusion, we recommend leaving the caps on the gas and oil fills until you are ready to pour either gasoline or oil
into the correct fill.
Note: Use SAE 30 high detergent oil classified “For Service SF, SG, SH, SJ” or higher. Do not use special additives. Other types of oil
could cause problems operating your machine. Please refer to your Engine Owner’s Manual for detailed oil information.
Adding Oil
1. Place the machine on a level surface and remove the Dipstick (clean
the end of the Dipstick with a rag) (Figure 21a and 21b).
2. Machines are shipped with no oil. Add 1/2 of the SAE 30 high
detergent oil recommended by the engine manufacturer and wait one minute
for the oil to settle.
3. Replace the Dipstick all the way in and turn a quarter turn clockwise
(16.5) or screw fully in (21.0) to ensure an accurate reading and then remove it
to check the oil level.
Figure 21a: 16.5 Model
Oil Check/Fill
Gas Fill Cap
Figure 21b: 21.0 Model
Gas Fill Cap
Oil Check/ Fill

CONTACT US AT www.DRpower.com 17
4. If the oil level is low continue adding a few ounces of oil at a time,
rechecking the Dipstick until the oil reaches the fill mark (Figure 22a and
22b). Be careful not to overfill.
Adding Gas
1. Remove the Gas Fill Cap and fill the Gas Tank with fresh, unleaded gas
(with a minimum of 85 Octane) to approximately 1" to 1-1/2" below the top
of the fill neck to allow for fuel expansion (Figure 21a and 21b). Be careful
not to overfill and reinstall the Gas Fill Cap before starting the engine. See
your Engine Owner’s Manual for more detailed information.
Note: To refill the gas tank, turn the engine OFF and let the engine cool at least five
minutes before removing the gas fill cap.
Check the Tire Pressure
Tools Needed:
Tire Pressure Gauge
Air Compressor
1. Remove the Valve Stem Protective Cap and check the tire pressure with a
Tire Pressure Gauge (Figure 23).
2. If the pressure is too low, add air through the Valve Stem with an air hose.
3. Replace the Valve Stem Protective Cap when finished.
Operating
Range
Too Low
(add oil)
Too Full
(drain oil)
Figure 22b: Pro-21.0 Model
Operating
Range
Too Low
(add oil)
Too Full
(drain oil)
Figure 22a: 16.5 Model
Do not over inflate the tires. Inflate to the manufacturers recommended
pressure found on the tires.
Figure 23: Yard-Tow Model Shown
Valve Stem
Protective Cap

18 DR®SELF-FEEDING CHIPPER

CONTACT US AT www.DRpower.com 19
Chapter 3: Operating Your DR SELF-FEEDING CHIPPER
This chapter covers the procedures for starting and stopping your new DR SELF-FEEDING CHIPPER and discusses basic
operation features.
Before Starting the Engine
1. Check the oil level every time you use the DR SELF-FEEDING CHIPPER.
Add oil if needed (see Chapter 2 section “Adding Engine Oil and Gasoline”.
2. Check the fuel level. Add fuel as needed (see Chapter 2 section “Adding
Engine Oil and Gasoline”.
3. Ensure that the Fuel Shut-Off Valve is in the “ON” position (Figure 24).
4. Remove any debris buildup from the machine before every use of the
Chipper.
Note: Check and re-tighten the Drive Belt, if necessary, after an initial break-in
period of one (1) hour (see Chapter 4 “Maintaining the DR SELF-FEEDING
Chipper”).
Operation Notes
Visually check the Chipper Knife for damage before each use of the
machine. See “VISUAL inspection of the Chipper Knife (before each use)”
in Chapter 4 for info on accessing the Chipper Knife.
At engine start-up, the engine of your DR CHIPPER operates under no load
until approximately 1800 RPM, at which speed the Centrifugal Clutch
engages and begins driving the Rotor Assembly. Always operate the Engine
at full speed when chipping.
Only operate the DR SELF-FEEDING CHIPPER from the Operator Zones
shown (Figure 25).
Keep proper balance and footing while operating the DR SELF-FEEDING
CHIPPER.
ALWAYS stop the engine when leaving the Operating Zones or when
moving the machine.
Never move the Chipper while the engine is running or the Flywheel is
turning.
Fi
g
ure 25
Operato
r
Zone
Operato
r
Zone
Discharge
A
rea
Top View
Hopper
Fuel Shut-Off
Valve
Figure 24
The design of this machine is for chipping wood. Never use this machine for any other purpose as it could cause serious
injury.
Contact with internal rotating parts will cause serious personal injury. Never put hands, face, feet, or clothing into chipper
hopper or discharge opening or near the discharge area at any time.
Before performing any maintenance procedure or inspection, shut down the engine, wait for all moving parts to come to a
complete stop (The flywheel will continue rotating for a while after the engine is shut down), disconnect spark plug wire,
keeping it away from the spark plug to prevent accidental starting, disconnect the negative battery cable, then wait 5 minutes
before proceeding.
Use only a wooden stick to clear jammed material.

20 DR®SELF-FEEDING CHIPPER
Use common sense when using the Machine. Learn to recognize the change in sounds when overloaded. Turn Off the Engine
immediately if the machine becomes jammed to prevent damage to the Drive System
Never throw remaining Stubs or Knots into the Chipper Hopper; Damage will Result.
Processing Material
The Chipper is designed to accept wood only. The Chipper Knife mounted on a revolving flywheel turns branches fed into the
Chipper Hopper into “chips”. Cut your materials into manageable lengths before feeding them into the Chipper Hopper.
Your DR SELF-FEEDING CHIPPER can process dry or green wood up to 4-3/4" (16.5) or 5-3/4" (21.0) in diameter.
The Chipper will self-feed the wood once it contacts the knife edge so forcing the branches into the Hopper is not necessary if
the knife is sharp.
Green wood will process quicker and easier than dry wood.
Softwood processes easier than hardwood.
Your operator experience will teach you how different types of wood will chip and how fast you can process them.
When chipping branches, sometimes a tail will develop at the end of a branch. To avoid this, rotate the branch while feeding
it into the Chipper Hopper.
Rotating the branch as you feed it into the machine will improve chipping performance.
Use caution with small diameter green saplings and branches less than 2" in diameter. Chip these grouped or bundled
together to provide support for each other. If the material is 2" or larger, feed only one at a time into the Chipper Hopper.
Make sure the DR SELF-FEEDING CHIPPER finishes processing material in the Hopper before shutting the engine off.
Do not force material into the Chipper. If the machine does not chip well, the Chipper Knife may need sharpening or
replacement, or the gap between the Knife and the Wear Plate needs adjusting. See “Removing, Replacing and Adjusting the
Chipper Knife and Wear Plate” in Chapter 5.
Extremely hard knots will not process very well. Push any short stubs that have not self-fed through the Chipper, with the next
branch to be chipped.
Cut the material to be chipped into manageable lengths of no more than five or six feet long before chipping them.
Overloading the Chipper Hopper will cause the rotor speed to decrease. If you hear the engine RPM decreasing, stop feeding
material into the Chipper Hopper until the engine has returned to full speed.
Always wear protective goggles or safety glasses with side shields while chipping to protect your eyes from possible thrown
debris.
Avoid wearing loose clothing or jewelry, which might catch on moving parts or the material fed into the chipper hopper.
We recommend wearing gloves while chipping. Be sure your gloves fit properly and do not have loose cuffs or drawstrings.
Wear shoes with non-slip treads when using your chipper. If you have safety shoes, we recommend wearing them. Do not
use the machine while barefoot or wearing open sandals.
Wear long pants while operating the DR SELF-FEEDING Chipper.
Use ear protectors or ear plugs rated for at least 20 dba to protect your hearing.
The chipper hopper must be securely bolted to your DR SELF-FEEDING chipper and the blowback shield in place before using the
machine!