And congratulations on your purchase of a new DR
®
TRIMMER/MOWER™!
®
We have done our utmost to ensure that your DR
will
be one of the most trouble-free and satisfying pieces of
equipment you have ever owned.
Please let us know of any questions or problems you
may have. We want to answer or correct them as quickly
as possible. (When you do call or write, please have your
serial number and/or order number handy—it will speed
things up!) We also hope to hear from you on how much
you like your new helper.
And please tell your friends about your new DR
®
TRIMMER/ MOWER™. Having DR® Owners spread the
word about our products and our way of doing business is
the best advertising we can have, and it's the best way to
help us provide even better service in the years to come.
Thanks once again!
for all of us at...
COUNTRY HOME PRODUCTS
DR® TRIMMER/MOWER™ Assembly & Operating Instructions i
®
Safety Instructions
We want you to enjoy years of productive use from your DR® TRIMMER/MOWER™. We don't
want you to get injured, so please take a few moments to read the following guidelines for safely
operating your new machine.
Dress Appropriately
· Always wear protective goggles (provided with your DR
mowing, to protect your eyes from possible thrown objects.
· Wear shoes with non-slip treads when using your DR
safety shoes, we recommend wearing them. Do not use the machine while barefoot or
wearing open sandals.
· Wear long pants while trimming, and avoid wearing loose clothing or jewelry which might
get caught on the mower's moving parts.
· Use ear muffs or ear plugs to protect your valuable hearing.
Preparation
· Read these Assembly & Operating Instructions and the engine manufacturer's owner's
manual before you use the DR® TRIMMER/MOWER™. Become familiar with the controls,
engine and service recommendations to ensure the best performance from your machine.
®
TRIMMER/MOWER™) while
®
TRIMMER/MOWER™. If you have
· Inspect the area you'll be working in for hidden objects such as large rocks, logs, rope, wire,
garden tools, etc., and remove these obstacles before mowing. Do not attempt to mow over
obstacles as this could damage the machine and cause injury.
Operating the Machine Safely
· Only use the DR
growth as specified in this manual.
· Use only manufacturer-recommended replacement parts and accessories.
· Never bend, cut, fit, weld, or alter the DR
Modifications to your machine could cause personal injuries and property damage, and may
void your warranty.
· ALWAYS shut off the engine and remove the spark plug wire prior to making any
adjustments to the machine. If you have to stop to remove grass or debris from the underside
of the deck, ALWAYS disconnect the spark plug wire first.
· The exhaust area on the engine becomes very hot. Allow the engine to cool before doing
maintenance or making adjustments.
· When operating over uneven terrain and slopes, use EXTREME CAUTION and ensure solid
and firm footing at all times.
· Use extra caution when mowing in wet, slippery conditions.
· As with any trimmer, the tips of the cutting cords on the DR
throw sticks, small stones, gravel, and bits of debris for long distances at great velocity. The
faster the cutting cords are spinning, the farther debris may be thrown. Do not move over
loose materials such as gravel or mulch with the trimmer head spinning. Doing so could
cause personal injury or property damage from thrown objects.
®
TRIMMER/MOWER™ for trimming and mowing grass, weeds, and other
®
TRIMMER/MOWER™ in any way.
®
TRIMMER/MOWER™ can
DR® TRIMMER/MOWER™ Assembly & Operating Instructionsii
· Turn off the engine whenever you leave the operating position. Never leave the engine
running when refueling, changing cords or checking, cleaning or working on the machine.
· Never allow children or animals near the work area. Keep at least 50 feet clear of
bystanders, and always turn the machine off when someone approaches to avoid causing
injury from thrown objects.
· Never allow children or people unfamiliar with these instructions to use the DR
TRIMMER/ MOWER™.
· Be cautious when using your DR
hoses. It is possible that these and other debris can become wound around the line plates of
the machine, potentially damaging the bearings or injuring the operator.
®
TRIMMER/MOWER™ around fencing, wires, ropes, and
®
· Use the machine only in daylight or good artificial light.
· Never operate the machine with a damaged shield or without the shield in place.
· Do not operate the machine when under the influence of alcohol or medication.
· Watch for traffic when mowing near roadways.
Safety with Gas-Powered Machines
· Do not run the engine in an enclosed area or without proper ventilation.
· Store all fuel in containers specifically designed for this purpose. Plastic containers are more
likely to prevent sediment and condensation problems.
· Refuel outdoors only, and do not smoke while refueling or operating the machine.
· If gas is spilled, 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 before storing in any enclosure. Never store the
machine with gas in the tank near an open flame or spark.
· Do not change the engine governor settings or modify the engine speed.
· Some state and local regulations require the use of a spark arrester on gas powered
engines. Contact your local fire marshal or forest service for specific information
pertaining to your area. If you are required to use a spark arrester, please contact one
of our Customer Service Representatives for assistance in obtaining and installing one.
Warning to All California and Other Users
Under California and Washington State laws, 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. All DR
provided 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 or forest service for
specific information in your area.
®
TRIMMER/ MOWERS shipped to California and Washington state are
DR® TRIMMER/MOWER™ Assembly & Operating Instructions iii
Table of Contents
SAFETY INSTRUCTIONS..............................................................................................................................................II
Dress Appropriately ........................................................................................................................................................ ii
Preparation...................................................................................................................................................................... ii
Operating the Machine Safely......................................................................................................................................... ii
Safety with Gas-Powered Machines.............................................................................................................................. iii
Warning to All California and Other Users................................................................................................................... iii
TRIMMER PARTS & COMPONENTS ..........................................................................................................................1
ASSEMBLY COMPONENTS...........................................................................................................................................2
ASSEMBLY ........................................................................................................................................................................3
CONTROLS & FEATURES .............................................................................................................................................9
STARTING & OPERATING..........................................................................................................................................10
Electric-Starting.............................................................................................................................................................10
Manual-Starting .............................................................................................................................................................10
Stopping the Engine.......................................................................................................................................................11
Engaging the Trimmer Head..........................................................................................................................................11
Stopping the Cords Spinning.........................................................................................................................................11
Using the Parallel Trimming Action (PTA
Cutting Cords .................................................................................................................................................................13
Cord Tips.......................................................................................................................................................................15
Adjusting the Cutting Height.........................................................................................................................................16
Mow-Ball
™
Support.......................................................................................................................................................16
Adjusting the Handlebar................................................................................................................................................16
Obstacles ........................................................................................................................................................................17
Heavy Growth................................................................................................................................................................18
Wet Conditions..............................................................................................................................................................18
Very Dry Conditions......................................................................................................................................................18
Slopes.............................................................................................................................................................................18
Windrows.......................................................................................................................................................................19
Firebreaks.......................................................................................................................................................................19
End-of-Season Garden Clean-Up...................................................................................................................................19
™
) Feature ...................................................................................................12
MAINTENANCE..............................................................................................................................................................20
Regular Maintenance.....................................................................................................................................................20
Battery Care (Electric-Starting Models Only)...............................................................................................................21
To Remove the Mow-Ball
To Reassemble the Mow-Ball
™
Support Assembly.............................................................................................................22
™
Support Assembly.......................................................................................................23
To Partially Lower the Bearing Housing Assembly (to remove debris)........................................................................24
To Check the Bearing Housing Assembly for Damage.................................................................................................24
To Remove and Replace the Bearing Housing Assembly.............................................................................................25
To Replace the Belt........................................................................................................................................................27
To Adjust the Belt Tension through the Trimmer Control Cable ..................................................................................28
To Adjust the PTA
™
Feature..........................................................................................................................................29
TROUBLESHOOTING...................................................................................................................................................30
PARTS LIST.....................................................................................................................................................................34
SCHEMATIC DRAWINGS ............................................................................................................................................36
DAILY CHECKLIST FOR THE DR
®
TRIMMER/MOWER™...........................................................BACK COVER
DR® TRIMMER/MOWER™ Assembly & Operating Instructionsiv
Trimmer Parts & Components
The following parts and assembly components should be in your DR® TRIMMER/MOWER
™
package. Please check your shipping box(es) and parts package(s) for the items listed below. If
your shipment is incomplete or if you have any questions, please call us TOLL-FREE
1(800)DR-OWNER(376-9637).
Assembly Components:
1—Upper Handlebar [#143641], Commercial Model, or
[#144071], PRO Model
1—Lower Handlebar [#143631], Commercial Model, or
[#144061], PRO Model
2—Handlebar Adjuster Assemblies [#145801] in separate plastic bag
1—Axle [#114261]
1—Rubber Stone Guard [#116801]
1—PTA™ Lever [#118221]
1—Acrylic Shield Assembly [#120521]
2—Wheels [#139861], Commercial Model, or
[#121761], PRO Model
Parts Bag Contents:
2—Wheel Retainer Rings [#119551]
2—Stone Guard Clamps [#131031]
1—Black Nylon Axle Washer [#121521]
4—5/16" Washers [#121691]
5—Lock Nuts 5/16"-18 (larger size) [#110761]
2—Set Screws 1/4"-20 Square Head [#120161]
7—Slotted Hex Head Bolts 10-24 x 5/8" Long [#114781]
7—Lock Nuts 10-24 (smaller size) [#118731]
2—U-Bolts [#114851]
1—PTA™ Lever Grip [#117491]
®
Please refer to Figure 1 on the next page when preparing to assemble your DR
TRIMMER/
MOWER™. We recommend laying the parts out in sets, as we have shown them, before
assembly.
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 1
Assembly Components
Figure 1
DR® TRIMMER/MOWER™ Assembly & Operating Instructions2
Assembly
WARNING! Do not attempt to start the engine until all assembly steps are complete, and
you have ADDED GAS AND OIL to the engine.
Tools & Supplies Needed:
• flat head screwdriver
• 1/2" and 3/8" wrenches, adjustable
wrench, or socket set
• 7/16" wrench (Commercial Model)
• pliers
• SAE30 High Detergent motor oil
• funnel (preferably with filter)
• unleaded gasoline
Step 1: Install the Axle
1. Start with the orange housing upside
down. Leave the packaging on the
front end in place to balance the
machine during assembly.
2. Place the black nylon axle washer
over the axle stud at the center back
of the housing (Figure 2).
3. Insert the axle through the slot in the
outside of the housing so the plate
faces the axle stud (Figures 2 & 3).
4. Center the axle and slide the hole in
the notched plate over the stud so that
it rests flush against the nylon
washer. Be sure the axle is seated on
the axle stud solidly (Figure 3).
5. Screw a 5/16" lock nut onto the axle
stud using a 1/2" wrench or socket.
Tighten it until there is resistance, then
back off 1/2 turn. [If the bolt is too
tight, it will be hard to operate the
Parallel Trimming Action (PTA
Feature.]
™
)
WARNING!
THIS MACHINE IS SHIPPED WITHOUT OIL!
TRACES OF OIL MAY BE IN RESERVOIR
FROM FACTORY TESTING, BUT YOU MUST
ADD OIL BEFORE STARTING ENGINE. FILL
RESERVOIR SLOWLY, CHECKING DIPSTICK
FREQUENTLY TO AVOID OVERFILLING.
Figure 2
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 3
Figure 3
Step 2: Attach the Rubber Stone Guard
1. Take one of the two stone guard clamps and position it around the axle (Figure 4). Install the
second clamp midway along the opposite side of the axle in the same way. Turn the open
ends of the clamps upward.
2. Holding the rubber stone guard vertically over the axle, slip one side of the stone guard in
between the clamp end so that the hole in the guard is aligned with the holes in the clamp.
Insert a 5/8" long bolt and attach a lock nut (Figure 5). Tighten with a 3/8" wrench or socket
and screw driver until the threads show. Do not over tighten. Repeat on the other side. The
stone guard should swing freely from the axle.
Figure 4
Figure 5
Step 3: Install the Wheels
1. Mount each wheel on the axle. Push
the wheels firmly against the axle
stop.
2. Place a retaining ring on the axle,
against the wheel, and tighten the set
screw (Figure 6) with a wrench or
pliers. Repeat on the other side.
Step 4: Set the Machine
Upright
Note: Be careful not to kink, twist or
stretch the control cables.
1. Remove the packaging from the front
end.
2. Stand at one side of the machine, holding on to one wheel with one hand, and the nose of the
machine with the other. Lift the nose of the machine up and over until the Mow-Ball
Support is resting on the ground and the machine is upright (most of the weight is on the
wheels during this maneuver).
Figure 6
™
DR® TRIMMER/MOWER™ Assembly & Operating Instructions4
3. Bring the upper handlebar section up and over the front end of the machine. Let it rest there.
Caution: DO NOT add gas or oil to the engine at this time.
Step 5: Install the Handlebars
A) Lower Handlebar
Note: There are 2 U-bolts, 4 washers,
and 4 lock nuts in your parts bag that will
be needed for the lower handlebar
assembly.
1. With the control cables on the inside
of the handlebar, position the lower
handlebar over the bolt holes in the
trimmer frame (Figure 7).
2. Place the U-bolts through the bolt
holes in the trimmer frame from the
inside out (Figure 7). Be sure the
black control cable on the underside of
the trimmer is clear of the U-bolt.
3. Mount the washers and nuts and secure
them snugly on both sides (Figure 8).
Figure 7
B) Upper Handlebar
Note how the components of the handlebar
adjuster assemblies go together before
mounting the upper handlebars. There is
an inside and an outside adjuster. The
outside adjuster has a beveled edge
(Figure 9).
1. Take apart the handlebar adjustment
assemblies one at a time.
2. Insert the bolt through the bottom hole
in the lower handlebar from the inside
facing out (Figure 9).
3. Mount the inside adjuster (no beveled
edge) with the cup snug to the lower
handlebar.
4. Mount the spring on the bolt, then add
the outside adjuster (has a beveled
edge). There is a notch at the top of
each adjuster—they should line up,
and the teeth should fit snuggly
together
(Figure 9).
Figure 8
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 5
Figure 9
5. Make sure the control cables are over the lower handlebar. Mount the upper handlebar with
the bolt going through the bottom hole. The cup in the outside adjuster should fit snuggly
against the upper handlebar (Figure 9).
6. Add the knob and tighten.
7. Repeat on the other side.
Step 6: Install the Parallel
™
Trimming Action (PTA
1. Insert the straight end of the L-shaped
PTA™ lever through the hole in the
center of the lower handlebar (Figure
10).
2. Align the flat end of the PTA™ lever
with the corresponding hole in the
™
latch installed at the center rear
PTA
of the frame (Figure 11).
3. Mount a 5/8" long bolt through the two
holes. Tighten with a lock nut until
there is slight resistance, then back off
two full turns.
Note: If the lock nut is too tight, the
™
lever will be hard to engage.
PTA
4. Install the black, vinyl handle grip over
the operator's end of the PTA™ lever.
) Lever
Figure 10
Step 7: Attach the Acrylic
Engine Shield
Use the four remaining sets of 5/8" long
bolts and lock nuts to attach the acrylic
engine shield.
You may find it easier to tip the machine
back on its handlebars in order to reach the
underside.
1. Position the shield on the frame in
front of the engine with the bend at the
top facing the handlebars.
2. Insert the bolts from the outside facing
in, screw on the nuts and tighten
(Figure 12).
Figure 11
Figure 12
DR® TRIMMER/MOWER™ Assembly & Operating Instructions6
Step 8: Connect the Battery Wires (Electric-Starting models only)
To prevent the battery from discharging during shipment, all electric-starting trimmers are
shipped with one or both battery wires disconnected.
On the PRO Model:
Connect the two black wires by pushing the plastic ends together (Figure 13). See the red wires
for comparison. The wires are located on the left front side when standing in the operator's
position.
On the Commercial Model:
Connect both wires to the battery terminals as shown in Figure 14. Red to red and black to
black.
Note: Be careful not to hit the wires on the metal bracket. You may short them out.
Figure 13
Figure 14
Step 8a: Connect the Throttle Cable (Commercial Model Only)
Tools Needed:
• 7/16" wrench
1. Remove the 1-1/2" long bolt from the
left handlebar.
2. Attach the throttle control to the left
handlebar with the 1-1/2" long bolt
(Figure 14a). The throttle cable
should go around the front of the
engine, along the left side of the
engine, then up toward the handlebar.
Be sure the cable is over the lower
handle bar before attaching it.
3. Secure the throttle cable to the lower
handle bar with a cable tie.
Figure 14a
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 7
Step 9: Add Oil and Gas
WARNING! You must add oil before starting engine. There may be 1 to 2 ounces of
oil left in your machine from factory testing. Check the dipstick frequently while
adding oil to avoid overfilling.
Reminder: To avoid confusion, we
recommend leaving the caps on the fuel
and oil fills until you are ready to pour
either gasoline or oil into the correct fill.
1. Use SAE30 High Detergent oil. Add
approximately 15 ounces of oil and
wait one minute for the oil to settle.
Check the dipstick, then continue
adding small amounts of oil and
rechecking the dipstick until it reaches
the full mark (Figure 15). Do not
overfill.
Important! To get an accurate
reading when checking the oil level:
• On the PRO model the dipstick should be screwed down.
• On the Commercial model the dipstick should not be screwed down.
Figure 15
Please refer to your engine manufacturer's owner's manual for more detailed oil information.
2. Fill the gas tank to within 1/4 inch of the top with fresh, unleaded gas. See your engine
manufacturer's owner's manual for more detailed fuel recommendations.
Caution: Once you have added the oil and gas, avoid tipping the trimmer back on its
handlebars. Doing so will cause the cylinder to fill with oil. If you need to reach the underside of
the trimmer, drain the oil and gas first, or set the machine up on a workbench.
DR® TRIMMER/MOWER™ Assembly & Operating Instructions8
Controls & Features
Note: PRO Model Shown
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 9
Figure 16
Starting & Operating
WARNING!
THIS MACHINE IS SHIPPED WITHOUT OIL! TRACES OF OIL MAY BE IN RESERVOIR
FROM FACTORY TESTING, BUT YOU MUST ADD OIL BEFORE STARTING ENGINE.
FILL RESERVOIR SLOWLY, CHECKING DIPSTICK FREQUENTLY TO AVOID
OVERFILLING.
Electric-Starting
1. Push the throttle lever on the left side
of the handlebar (Figure 16) all the
way forward to the START position.
2. On the PRO model:
Prime the engine. Make sure you
completely cover the air hole. Push
the black primer bulb (Figure 17) for
three seconds and completely release
it, letting it pop back to its original
position. Repeat three to four times.
The Commercial model does not have
a primer.
Note: Priming is usually unnecessary
when restarting a warm engine. In
cool weather priming may need to be
repeated
3. Turn the key (Figures 17 & 18) to the
START position until the Trimmer
starts, then release. The key will snap
back to the RUN position.
Note: The key switch on the
Commercial model is located between
the engine and the shield on the left
side of the trimmer (Figure 18).
.
Figure 17
Manual-Starting
Can be used with both Manual- and
Electric-Starting models.
1. Push the throttle lever on the left side
of the handlebar (Figure 16) all the way forward to the START position.
Figure 18
DR® TRIMMER/MOWER™ Assembly & Operating Instructions10
2. On the PRO model:
Prime the engine. Push the black primer bulb (Figure 17) for three seconds and completely
release it, letting it pop back to its original position. Repeat three to four times.
The Commercial model does not have a primer.
Note: Priming is usually unnecessary when restarting a warm engine. In cool weather
priming may need to be repeated
3. Grasp the recoil starter handle (Figure 16), and slowly pull until resistance is felt. Let the
cord retract a little bit, then pull the cord rapidly to start the engine. One or two pulls usually
starts the DR
PRO models).
®
TRIMMER/MOWER™, but it may be necessary to repeat the priming (on
Stopping the Engine
Move the throttle lever (Figure 16) back to the STOP position.
Note that on Electric-Starting models the key does not stop the engine. You must throttle down.
The key has a pressure lock that prevents it from vibrating loose during operation. If you wish to
remove the key, push it in and then quickly and firmly pull it out. If the key is difficult to
remove, spray FLUID FILM® or a comparable lubricant into the keyhole.
Engaging the Trimmer Head
1. Bring the bail bar (Figure 16) toward you and grip it together with the handlebar. Keep
holding the bail bar to the handlebar.
2. With your right hand, push the trimmer head control lever (marked "Blade Control") on the
right side of the handlebar all the way forward—until it engages. You may have to push hard
until you feel it engage. Once the trimmer head control engages, release the lever and
continue to hold the bail bar. The cutting cords will now be rotating and will continue to
rotate until you release the bail bar.
Stopping the Cords Spinning
Release the bail bar from the handlebar. The trimmer head will stop spinning while the engine
continues to run.
If the trimmer head keeps spinning after the bail bar is released you may need to adjust the
trimmer control cable. See page 28.
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 11
Using the Parallel Trimming Action (PTA™) Feature
™
mode
™
Figure 19
The DR® TRIMMER/MOWER'S PTA
Feature allows the machine to move in a
straight line while the trimmer head is
both pivoted and tilted for better access to
fence lines and other obstacles (Figure
19). This feature allows you to trim in
difficult areas without having to pull the
machine back and forth.
The cutting cords extend beyond the wheel
base when in the PTA™ mode, which
allows you to easily cut under obstacles.
The trimmer head and the cutting cords
also tilt slightly when in the PTA
so you can edge and trim along gardens,
paths and driveways.
Note: Use caution when edging along
gravel paths and driveways. Flying debris
can cause serious damage.
When using your PTA™ along garden
edges, fences, and buildings, we
recommend making your first pass with
the DR® TRIMMER/ MOWER™ in the
regular mowing position, staying 4 to 8
inches from the obstacle. Then, return for
another pass with the machine cutting in
the left or right PTA™ mode.
To Engage Parallel Trimming
Action
1. Pull up on the PTA™ lever until you
see the two dog ears at the bottom of
the lever (Figure 21). You may need
to turn the lever to see them. This
unlocks the axle.
2. Turn the lever one quarter turn so the
dog ears rest on the PTA
bracket at the base of the frame after
the lever is released (Figure 21).
3. Push down on the handlebar to tip the
nose of the machine off the ground
about six inches. By balancing the
weight of the machine on the wheels, it
is easier to pivot the front of the
trimmer to the left or right.
™
latch
DR® TRIMMER/MOWER™ Assembly & Operating Instructions12
Figure 20
Figure 21
4. Grip the sides of the handlebar, pulling up with one hand and pushing down with the other,
swinging the front of the trimmer to the left or right. If this action is difficult please see the
section “To Adjust the PTA™ Feature” on page 29.
5. To lock in the left or right position, pull the PTA™ lever back and turn it a quarter of a turn
and release. It will spring into place and lock into the axle plate.
To Return to Flat and Forward Mode
1. Pull the PTA™ lever and turn a quarter of a turn so the lever is resting on the dog ears.
2. Release the lever, push down on the handlebars, and pivot the trimmer head straight ahead.
3. Pull and turn the PTA™ lever a quarter turn, release the lever, and it will automatically lock
the machine into the forward position.
Cutting Cords
WARNING! Always turn the engine off when installing or changing cutting cords.
Note: Before trimming, engage the cutting head with the engine running and spin new cords for
a few seconds so they pull tight and set.
Figures 22 and 23 illustrate how the cords are installed on the line plates. There are two sets of
installation points on each line plate, 180 degrees apart. One set of holes is for larger cord (155
mil) and is marked with large arrows. The other set of holes accommodates smaller cord (130
mil) and is marked with small arrows. Always install two cords opposite each other for the best
performance.
Caution! Running the trimmer with only one cord installed, or cords installed at other than 180
degrees can cause excessive vibration and may damage the machine.
Figure 22
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 13
Figure 23
Cord Installation
The standard cord installation method is shown in Figures 24-26. This is how your trimmer is
shipped from the factory.
1. Insert the ends of the cords into the
openings in the line plate, as shown in
Figures 23 and 24. There are different
sized arrows at the insertion points to
indicate what size cords fit the holes.
Figure 24
2. Push the cord through until it comes
out the center hole in the line plate as
shown in Figure 25. Adjust the cords
so the tips are even.
3. Pull the cords below the loop and push
the loop up into the groove above
them, as shown in Figure 26. Then
pull the cords tight.
Figure 25
Figure 26
DR® TRIMMER/MOWER™ Assembly & Operating Instructions14
Cord Tips
Two thicknesses of cutting cord ship with your DR® TRIMMER/MOWER™: Heavy-Duty (130
mil) and Extra Heavy-Duty (155 mil). Because conditions and vegetation vary so much,
experiment with the different cord weights in order to discover what works best for your
particular mowing and trimming situations. Here are a few things to keep in mind:
· The best trimming performance will usually come from using the smallest diameter cord
(which is still capable of cutting the material at hand), combined with the fastest engine
speed. When more power is needed for thicker growth such as berry canes, brambles, thistles
or ragweed, you may want to use the Extra Heavy-Duty (155 mil) cord in combination with
the highest engine speed.
· Move slowly into thick growth. If there are woody weeds in the material being cut, the
cutting cords may wrap around the stalks they cannot cut and pull away from the trimmer
head.
Reminder: The ends of the cutting cords do the cutting.
F
· To increase the cutting swath, install each cord slightly offset, with one side about and inch
longer than the other. Be careful not to offset the cords by more than an inch. Doing so may
cause the cords to hit the wheels.
· Please note that installing more than two cords at a time does not improve trimming
performance—in fact it can lessen it. Adding additional cords creates drag on the trimmer
head, robs the engine of power and may cause wrapping. Installing two cords, 180 degrees
apart, is the best method for optimal trimming performance.
· If you buy cutting cord in rolls, cut it in 23" lengths.
· When replacing cords, do it one at a time and use the old cord to mark the position for the
new cord to be installed.
· If the cord breaks off flush at the line plate, use the new cord to push the old cord out.
· Storing the cord in a plastic bag with a damp sponge or cloth will help keep it pliable. You
can also soak your cutting cord in a bucket of room temperature water for a few days before
use to make it more pliable.
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 15
Adjusting the Cutting
Height
Adjusting the cutting height is easy.
Simply install the cutting cords at the line
plate that gives you the desired height.
Cutting heights range from 1-1/2" when
using the bottom line plate, to
approximately 3-1/4" when using the top
line plate (Figure 27).
Mow-Ball™ Support
Allow the front end of the machine to rest
lightly on the Mow-Ball™ Support (Figure
27) as you are trimming. The Mow-Ball
™
Support should glide on the ground as you
maneuver the machine.
In order to achieve the best and smoothest
cut, do not lift up on the handlebar while
operating your DR
®
TRIMMER/MOWER™. Lifting the
handlebar causes weight to be forced
down on the Mow-Ball™ Support. This
uses more energy, slows down the cutting,
and produces a less than satisfactory cut.
Ideally, the Mow-Ball™ Support should
lightly rest on the ground while the wheels
balance most of the weight of the machine
(Figure 28).
Adjusting the Handlebar
The correct handlebar height depends on
many factors for each individual.
However, it is crucial to find a height that
allows the Mow-Ball™ Support to glide
along the ground and remain balanced
without the operator having to push down
or pull up on the handlebar.
At the proper height, your hands should
rest at a comfortable level and the front
end of the trimmer should roll easily on
the Mow-Ball
Figure 28.
™
Support as shown in
Figure 27
Figure 28
You may find you like different handlebar
heights for different mowing conditions.
Figure 29
DR® TRIMMER/MOWER™ Assembly & Operating Instructions16
There are two ways to adjust the height of the handlebar:
1. Loosen both of the adjustment knobs (Figure 29) and move the handlebar up or down as
needed. It's important that the adjustment is the same on both sides. Use the notches on the
adjusters to measure how many teeth you've moved away from the center. When you've
found a comfortable height, tighten the adjustment knobs securely.
2. For additional adjustment options, there are two holes in the upper and lower handlebars that
can be used to adjust the height. Most people start with the handlebars set in the lower holes
of both the upper and lower handlebar. You can adjust the height up or down by removing
the adjustment knob assembly and repositioning the handlebars to a higher or lower hole.
See page 5 for information on reassembling the handlebar adjuster knobs.
Obstacles
Many Owners like to mow easy, open
areas with their regular riding or walkbehind mower, then they finish trimming
all the odd and hard-to-reach spots with
the DR® TRIMMER/MOWER™ (Figure
30).
The DR® TRIMMER/MOWER
discharges cut material to the right.
Always try to cut and trim with the uncut
tall grass or weeds on the left (Figure 32).
™
Suggestion: For the neatest
F
appearance, do your trimming first,
discharging clippings away from borders
and shrubs, then do your mowing.
· Always check your work area before
trimming and remove any debris that
might tangle or damage the machine.
· If you do run into debris and the
trimmer gets tangled, turn off the
engine and disconnect the spark plug
wire before attempting to untangle the
machine.
· DO NOT run the machine over gravel
driveways or over loose stones or
mulch with the trimmer head spinning.
The engine's power can easily throw
stones, sticks and other debris at great
velocity, which could cause personal
injury or property damage.
Figure 30
Figure 31
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 17
Heavy Growth
Take your time in heavy growth. Be sure
to keep the uncut material to your left,
maintaining a clear discharge area to your
right (Figure 32). If the machine can't do
it all in one pass, overlap half of the
cutting swath. And if the grass is very
thick and heavy, try raising the trimmer
head off the ground a few inches by
pushing down on the handlebar. Cut the
material at this height, and then make a
second pass with the Mow-Ball™ Support
on the ground.
EASE the DR
®
TRIMMER/MOWER
™
Figure 32
into denser growth. If the material is too
tough or woody and can't be cut, the cutting cords will wrap around it, wear down or even break
off.
Sometimes, growth is so heavy that it can't be mowed in rows. A back and forth "vacuum
cleaner" motion often works better when tackling really tough material.
Wet Conditions
Because there is no housing to restrict the flow of cut
material, you can also use your DR
®
TRIMMER/MOWER™ to mow wet or heavy growth.
The DR® can be used in damp conditions—after a rain or
in the early morning dew—without clogging or stalling.
You can also mow wet areas such as ditches and around
ponds (Figure 33).
Very Dry Conditions
When trimming and mowing in very dry conditions, be
extra cautious of cut grass, chaff, weeds, seeds, etc.,
accumulating on the engine, especially around the recoilstarter housing and engine cooling fins. Frequently
remove debris from the recoil guard on top of the engine
to prevent overheating and engine damage.
Please see the engine manufacturer's owner's manual for
more detailed information on cleaning the air intake and
cooling system on the engine.
Figure 33
Slopes
You can trim and mow on slopes up to 20 degrees. Continuous use on slopes steeper than 20
degrees may deprive the engine of adequate lubrication, and damage components.
DR® TRIMMER/MOWER™ Assembly & Operating Instructions18
Windrows
The DR® TRIMMER/MOWER'S cutting cords cut even
tall grass in just one pass, so you can collect clippings
and leaves for mulch without raking (Figure 34). The
machine ejects cut material to its right, so you can use it
like a lawn broom to make windrows for easy clean-up.
Firebreaks
Use the DR® as a labor-saving tool to cut material when
creating firebreaks.
End-of-Season Garden Clean-Up
The DR® is perfect for cutting down dead perennials,
annuals and wildflowers, saving you hours of hand
deadheading and pruning. You can also re-cut downed
material a second time to create mulch for garden beds.
Figure 34
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 19
Maintenance
*** For engine maintenance, please refer to the engine
manufacturer's owner's manual. ***
IMPORTANT!: Because of the conditions the DR® TRIMMER/MOWER™ is used in,
air filters and oil should be changed more frequently than is recommended in your
engine manufacturer's owner's manual. Please follow these recommendations:
Paper Air Cartridge: Should be replaced every 25 hours of operation. More
frequently if operating in extremely dry and dusty conditions.
Oil: Should be drained and replaced after the first 5 hours, and every
subsequent 25 hours of operation.
Regular Maintenance
Regular maintenance is the way to ensure the best performance and long life of your machine.
Below is a list of recommended maintenance procedures. Follow the instructions in this manual
and your engine manufacturer's owner's manual.
WARNING: Always allow the engine to cool completely and remove the spark plug wire
before performing any maintenance procedure.
Caution: Do not tip the trimmer back on its handlebar to access the underside unless you
first drain the gas and oil.
1. Clean any debris from the top and bottom of the machine, cylinder head fins, blower housing,
finger guard, filter and muffler areas with a brush or rag.
2. Replace the paper air filter(s) and clean the foam filter every 25 hours of operation. More
frequently if operating in extremely dry and dusty conditions.
3. Replace the oil after the first 5 hours and every subsequent 25 hours of operation.
4. Clean the spark plug and replace it if needed.
™
5. Check the Mow-Ball
6. Drop the bearing housing and clean out any debris. Check for burrs on the pulley.
7. Lubricate the engine throttle cable, trimmer control cable, and idler pulley with FLUID
8. Check the Mow-Ball™ Support and line plates for wear.
9. Replace broken or frayed cutting cords.
10. Check the belt for fraying or stretching. Replace it if necessary.
11. Check the bolts and nuts on the bearing housing assembly. If they are loose, tighten them.
®
FILM
Check the bolts occasionally throughout the season to be sure they're secure.
or a similar lubricant.
Support assembly and clean out any debris.
DR® TRIMMER/MOWER™ Assembly & Operating Instructions20
Battery Care
(Electric-Starting Models Only)
Proper care can extend the life of a battery. Follow these recommendations to ensure your
battery's best performance and long life:
· Do not continue to crank the engine with a low battery.
· Try to keep the battery at full charge to maximize its life. If the machine is not used, the
battery should be charged every three months. See below for charging information.
· Store an unused battery in a dry area that does not freeze.
· Do not charge an already charged battery. In theory, our battery cannot be overcharged with
a trickle charger; however, when a battery is fully charged and the charger is still on, it
generates heat that could be harmful to the battery.
Automobile batteries last for years because they are recharged every time you drive your car—
usually on a daily basis. An Electric-Starting DR® TRIMMER/MOWER™ will recharge its
battery while you operate it. However, if you run your DR® infrequently or let it sit during the
off-season without recharging, the battery life will be dramatically shortened. If the battery loses
its charge, use the DR® Battery Charger or other trickle charger, to recharge it. The charger
should have an output of 12 Volts at 1-2 amps.
· At 1 amp the battery may need to be charged for as long as 48 hours.
· At 2 amps the battery may need to be charged for as long as 24 hours.
Note: Using the recoil starter and then running the engine will not recharge a dead or
significantly discharged battery.
To Connect a Battery Charger
1. Detach the two battery wires going to the wiring harness ("PRO model) or terminals
(Commercial model) on your DR® TRIMMER/MOWER™.
2. Next, attach the black (-) battery charger wire to the black (-) wire or terminal on the battery.
Then attach the red (+) battery charger wire to the red (+) wire or terminal on the battery.
3. Plug the battery charger into an outlet.
4. When the battery is charged, disconnect the charger from the battery before unplugging it
from the outlet.
Battery Troubleshooting
Symptoms of a battery needing a charge:
· The engine won't start with the key but will start with the recoil starter.
· A whirring noise coming from the starter.
· A grinding noise coming from the starter.
· No noise at all.
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 21
What to do:
· Check that the battery is fully charged. A fully charged battery should read 12 volts under
load. Manually start the engine and then put a volt tester on the battery. If you need to
charge the battery, follow the directions above.
· Check all cable connections.
· The wiring harness consists of a set of wires that lead from the ignition switch to the battery.
Disconnect and reconnect the battery wires (black to black and red to red) and check the wire
connections at the key switch.
· Call one of our Technical Service Representatives TOLL-FREE 1(800)DR-OWNER(376-
9637) for assistance.
To Remove the Mow-Ball™ Support Assembly
WARNING! Before performing any maintenance procedure, the engine should be stopped
and the spark plug wire disconnected.
Tool Needed:
• #3 Phillips head screwdriver or one with
at least a 6" shank
Set the machine on a bench if possible.
Do not tip the machine all the way back
on its handlebar unless you have drained
the gas and oil.
1. Insert the screwdriver into the hole in
the outer cylinder, then rotate the
Mow-Ball™ Support until the
screwdriver fits into a second hole in
the bearing housing, locking it into
place (Figure 35).
™
2. Turn the Mow-Ball
Support
assembly as you would a light bulb
(counterclockwise) until it unscrews
completely from the bearing housing
(Figure 36).
Note: If the Mow-Ball™ Support
assembly continues to turn, but does
not come off, rotate it until the
screwdriver fits into a third hole in the
bearing housing shaft. This should
lock it in place and allow you to
remove the Mow-Ball
assembly.
™
Support
Figure 35
Figure 36
DR® TRIMMER/MOWER™ Assembly & Operating Instructions22
To Reassemble the Mow-Ball™ Support Assembly
WARNING! Before performing any maintenance procedure, the engine should be stopped
and the spark plug wire disconnected.
Caution: Improper installation may cause damage to the bearings. Please follow these
directions carefully.
1. Reassemble the components in the order shown in
Figure 37.
· The line plates stack on top of one another with
the bumps on the bottom locking into the grooves
on the top of each plate.
· The head of the Mow-Ball™ bolt should sit in the
groove of the rectangular washer at the bottom of
the Mow-Ball™ Support. Hold the bolt head in
place with one finger and turn the Mow-Ball
Support assembly clockwise until it's finger tight.
™
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 23
Figure 37
To Partially Lower the Bearing Housing Assembly
(to remove debris)
If the bearing and trimmer head become clogged with debris the machine will not perform well.
As part of your regular maintenance routine, follow the steps below to keep the bearing housing
assembly free of debris.
WARNING! Before performing any maintenance procedure, the engine should be stopped
and the spark plug wire disconnected.
Tools Needed:
• 1/2" socket
• 1/2" open end or adjustable wrench
If possible, set the machine up on a bench. Do not tip the machine all the way back on its
handlebar unless you have drained the gas and oil.
1. Remove the three bearing housing nuts (Figure 38) and carefully lower the bearing housing
assembly from the frame. Brush out any dirt and debris (Figure 39) and check the pulley for
burrs or dents.
2. Replace the bearing housing assembly and tighten the bolts.
Note: If the belt comes off, please refer to the instructions on page 27 to ensure proper
positioning.
Figure 38
To Check the Bearing Housing Assembly for Damage
WARNING! Before performing any maintenance procedure, the engine should be stopped
and the spark plug wire disconnected.
Tool Needed:
• 1/2" wrench
If the trimmer head doesn't rotate when you engage the trimmer head control and the bail bar, try
the following test:
1. Leaving the Mow-Ball™ Support assembly in place, loosen and remove the three bearing
housing nuts and lower the bearing housing from the frame (Figures 38 & 39).
Figure 39
DR® TRIMMER/MOWER™ Assembly & Operating Instructions24
2. Detach the brake arm (Figure 40).
3. Pull the belt off the pulley.
4. Remove the spring or release the
break from the bearing housing
(Figure 40).
™
5. Turn the Mow-Ball
Support
assembly by hand. It should turn
freely, without resistance. If it doesn't
turn freely or you hear a grinding
noise, the bearings may be worn and
you may need to replace the bearing
housing assembly.
6. Call one of our Technical Service
Figure 40
Representatives at TOLL-FREE
1(800)DR-OWNER(376-9637) for information about replacing the bearing housing
assembly.
To Remove and Replace the Bearing Housing Assembly
WARNING! Before performing any maintenance procedure, the engine should be stopped
and the spark plug wire disconnected.
Tools Needed:
• 1/2" wrench
• 7/16" wrench
• pliers
• 5/32" Allen wrench
• you may also need a pulley extractor
To Remove the Old Bearing Housing
1. Remove the Mow-Ball™ Support
assembly. See page 22 for instructions.
2. Loosen and remove the three bearing
housing nuts and lower the bearing
housing from the frame (Figure 41).
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 25
Figure 41
3. Detach the brake arm from the brake
assembly (Figure 40).
4. Pull the belt off the pulley.
5. Remove the brake assembly and spring
from the bearing housing (Figure 42).
6. To remove the pulley, unscrew the set
screw from the pulley (Figure 43) with
an Allen wrench. Then tap the pulley
to loosen it from the shaft. Be careful
not to hit the shaft, as it will expand
and make the pulley harder to remove.
Remove the pulley. You may need a
pulley extractor.
To Mount the New Bearing
Housing
1. On the new bearing housing (Figure
44), mount the pulley and key (Figure
43), leaving the shaft recessed about
1/16", and secure with the set screw.
You may want to use LOCTITE® 242
to keep the set screw in place.
2. Mount the brake assembly and spring
(Figure 42).
3. Attach the brake arm to the brake
assembly (Figure 40).
4. Mount the belt on the bearing housing
pulley. Be sure the belt is placed on
the INSIDE of the belt guides and that
the other end of the belt goes through
the belt retainer and around the engine
pulley. Also, be sure the belt is on the
INSIDE of the idler pulley #1. Please
see page 27 for proper belt
installation.
5. Set the new bearing housing assembly
into place. Insert the three bearing
housing bolts through the frame, and
tighten the nuts (Figure 38).
™
6. Reassemble the Mow-Ball
assembly. See page 23 for
instructions.
Support
Figure 42
Figure 43
Figure 44
DR® TRIMMER/MOWER™ Assembly & Operating Instructions26
To Replace the Belt
Figures 45 & 46 show the belt and pulley system from the underside of the machine.
WARNING! Before performing any
maintenance procedure, the engine
should be stopped and the spark plug
wire disconnected.
1. Remove the bearing housing assembly
(see page 25).
2. Remove the old belt.
3. Take the new belt and loop it over the
bearing housing pulley and in between
the pivot sleeve and belt guide (Figure
47).
4. Put the opposite end of the belt around
the engine pulley, making sure the belt
is INSIDE the belt retainer, on the
INSIDE of idler pulley #1 and on the
OUTSIDE of idler pulley #2 (Figure
45).
Figure 45
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 27
Figure 46
Figure 47
To Adjust the Belt Tensi on through the Trimmer Control
Cable
If the trimmer head stops spinning when the bail bar is engaged and the machine is operating
under a heavy load, the belt may be too loose and the trimmer control cable may need to be
adjusted to put more tension on it.
When the trimmer control cable is properly adjusted, you should begin to feel tension on the
clutch control lever when it's pushed about half way down. If you feel tension before halfway,
the belt is too tight. If you don't feel tension until past the half way point the belt is too loose.
Before making any adjustments to the trimmer control cable, check that the belt is mounted on
the correct side of the idler pulleys (see Figure 45), and is not frayed, worn or stretched.
WARNING! Before performing any maintenance procedure, the engine should be stopped
and the spark plug wire disconnected.
Tools Needed:
• (2) 1/2" open-end or adjustable wrenches, or pliers
To adjust the belt tension through the trimmer control cable (Figure 48), you may find it easier to
set the trimmer up on a workbench, or, after draining the gas and oil from the engine, tip the
machine back on the handlebar.
To increase tension on the belt:
1. With a wrench or pliers, loosen the
control cable adjustment nut in front
of the frame, leaving about 1/8" of
space between nut and frame (Figure
49).
2. Grip the metal end of the black cable
with pliers, making sure you DO NOT
pinch it. At the same time, tighten the
rear nut until it is flush and snug
against the frame. The parts will then
be in the same position as in step 1,
but 1/8" to the right (Figure 49).
Figure 48
If the trimmer head keeps spinning after
the bail bar is released the belt may be too
tight.
To decrease tension on the belt:
Repeat the above steps, except this time
loosen the rear nut, then tighten the front
nut.
Figure 49
DR® TRIMMER/MOWER™ Assembly & Operating Instructions28
To Adjust the PTA™ Feature
WARNING! Before performing any maintenance procedure, the engine should be stopped
and the spark plug wire disconnected.
Tool Needed:
• 5/16" socket
It should be easy to engage the PTA
™
Feature. If you find it hard to release the
PTA™ lever and pivot the frame to the
side, loosen the axle nut one quarter turn
or so (Figure 50). Also be sure there is
some play between the bottom of the PTA
lever and the PTA pin at the rear of the
machine frame.
Keeping the axle clean will also help the
PTA™ feature work smoothly.
Lubricating the black axle slides (Figure
50) with FLUID FILM® or comparable
lubricant will also help keep the PTA
action smooth.
Figure 50
***For engine maintenance, please refer to the engine
manufacturer's owner's manual.***
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 29
Troubleshooting
WARNING! Before performing any maintenance procedure, the engine should be stopped
and the spark plug wire disconnected.
Engine won't start manually
(Please refer to the engine manufacturer's owner's
manual for engine-specific procedures.)
Engine won't start using electric-start
(Please refer to the engine manufacturer's owner's
manual for engine-specific procedures.)
Engine lacks power or is not running smoothly
(Please refer to the engine manufacturer's owner's
manual for engine-specific procedures.)
Þ On the PRO model: Are you priming? Push the
primer bulb 3 to 5 times, releasing completely
each time.
Þ Are you using fresh, clean gas? If it’s old,
change it. Use a fuel stabilizer if you keep gas
longer than two weeks or so.
Þ Does the engine have the right amount of clean
oil? If it’s dirty, change it following the procedure
in the engine manufacturer's owner's manual.
Þ Is the spark plug clean? If it’s fouled or cracked,
change it. If it’s oily, leave it out, hold a rag over
the plug hole and pull the recoil cord several
times to blow out any oil in the cylinder, then wipe
off the plug and reinsert it.
Þ Is the air filter clean? If it’s dirty, change it
following the procedure in the engine
manufacturer's owner's manual.
Þ Is the throttle cable attached to the engine and
moving freely?
Þ If your engine still won’t start, call 1(800)DR-
OWNER(376-9637) for advice and assistance.
Þ Have you checked all the items under manual
start above? If not, do so.
Þ Is your battery charged? Check it yourself or at a
gas station. If it’s low, charge it with a 12-volt,
1.5 to 2 amp trickle charger. If you don’t use your
®
for 45 minutes or so at a time, the battery
DR
may need to be periodically charged. See the
Battery Maintenance section on page 21.
Þ If your battery is charged and your DR
start, call 1(800)DR-OWNER(376-9637) for
advice and assistance.
Þ Are you using fresh, clean gas? If it’s old,
change it. Use a fuel stabilizer if you keep gas
longer than two weeks or so.
Þ Does your engine have the right amount of clean
oil? If it’s dirty, change it following the procedure
in the engine manufacturer's owner's manual.
Þ Is the spark plug clean? If it’s fouled or cracked,
change it. If it’s oily, leave it out, hold a rag over
the plug hole and pull your recoil cord several
times to blow out any oil in the cylinder, then wipe
off the plug and reinsert it.
®
still won’t
Engine lacks power or is not running smoothly
(continued)
Þ Is the air filter clean? If it’s dirty, change it
following the procedure in the engine
manufacturer's owner's manual.
DR® TRIMMER/MOWER™ Assembly & Operating Instructions30
(Please refer to the engine manufacturer's owner's
manual for engine-specific procedures.)
Trimmer head won't spin
Þ Is the throttle cable attached to the engine and
moving freely?
Þ Are the blower housing, throttle linkage and
cooling fins free of debris? Clean them following
the instructions in the engine manufacturer's
owner's manual.
Þ Are the bearing housing and trimmer head
clogged with debris? Drop it and clean it
according to the "To Partially Lower the Bearing
Housing Assembly" instructions on page 24.
Þ If your engine still lacks power, call 1(800)DR-
OWNER(376-9637) for advice and assistance.
Þ Is the trimmer head control fully engaged? Pull
the bail bar all the way back to the handlebar,
then firmly push the trimmer head control lever all
the way down until you hear a click. When you
release it, it will spring part way back. The head
will keep spinning as long as you hold the bail bar
against the handlebar.
Þ Is your v-be lt properly aligned? Check it against
the diagram in the Belt section on page 27.
Make sure the belt is inside idler pulley #1, that
the springs on the idler pulley arm and triangular
brake actuator are in place, and that the actuator
moves when you engage the trimmer head
control lever.
Þ Is your v-belt worn or frayed? If so, replace it.
Þ Are your bearings in good shape? Follow the "To
Check the Bearing Housing Assembly"
instructions on page 24.
Þ Are the bearing housing and trimmer head
clogged with debris? Drop and clean them
according to the "To Partially Lower the Bearing
Housing Assembly" instructions on page 24.
Þ If the head still will not spin, follow the procedure
for "To Adjust the Belt Tension through the
Trimmer Control Cable" on page 28.
Þ If none of the above helps, call 1(800)DR-
OWNER(376-9637) for advice and assistance.
Trimmer head keeps spinning
Trimmer head keeps spinning (continued)
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 31
Þ Is the trimmer head control disengaging? When
you release the bail bar, the control lever should
come all the way up against the bar, just below
the curve.
Þ Is the sleeve on the trimmer head control cable
clogged with debris? If so, clean it out and spray
some FLUID FILM
®
on the cable.
Þ Is your v-be lt properly aligned? Check it against
the diagram in the Belt section on page 27.
Make sure the belt is inside idler pulley #1, that
the springs on the idler pulley arm and triangular
brake actuator are in place, and that the actuator
moves when you engage the trimmer head
Cutting cords are breaking
control lever.
Þ Is the brake pad worn? Drop the bearing housing
according to the procedure in the maintenance
section of this manual and check the pad for
wear. Also make sure the spring is not broken,
missing or stretched.
Þ If the head keeps spinning when you release the
bail bar, see "To Adjust the Belt Tension through
the Trimmer Control Cable" on page 28.
Þ If none of the above works, call 1(800)DR-
OWNER(376-9637) for advice and assistance.
Þ Are your cords dry? Store cords in a plastic bag
with a damp sponge or cloth to make them less
prone to breaking. Or, soak them in a bucket of
water for a few days.
Þ Are you trying to do too much too fast? Ease into
material to be cut; the cord tips do the work.
Take small bites of tall or tough vegetation. Cut
half a swath at a time, keeping the cut area to the
discharge or right side of the DR
®
. Go over tall
material twice, the first time with the head tilted
up and back, the second time with the MowBallä Support on the ground.
Þ Try a lighter cord.
Þ Are you hitting your cords against a stone or a
chain-link fence? The cords just won’t last as
long as in the open. Work on controlling the
cutting pattern; with practice you’ll learn to cut
closer to obstacles without hitting them.
Cutting cords are pulling out
Parallel Trimming Ac ti on is diffic u lt
Þ Are you moving too fast into tough, woody
growth? If so, cords may wrap on stalks and pull
out. Check the operating tips in the section on
breaking cords above.
Þ Are you trying to cut material too heavy for the
cord? The DR
®
is designed to cut green material
up to about the thickness of a pencil. For very
heavy material, you may need the BEAVER
BLADE
®
attachment.
Þ Are you installing the smaller cord in the larger
openings?
Þ Is the axle binding when you shift into PTAä
mode? Spray some FLUID FILM
®
at the points
where the axle slides on the frame.
Þ Is the self-locking nut over the bolt that holds the
flat end of the PTAä lever to the latch too tight?
If so, loosen it 1/4 turn at a time until the PTAä
works smoothly.
Þ Is the axle nut under the frame too tight? If so,
loosen it a bit.
Þ If you still have tr oub le enga g ing the PT Aä
feature, call 1(800)DR-OWNER(376-9637) for
advice and assistance.
DR® TRIMMER/MOWER™ Assembly & Operating Instructions32
Mow-Ballä Support is wearing too quickly Þ Ar e you pushing the trimmer head down into the
ground? The DR
®
TRIMMER/MOWERä works
best with a light touch, with the Mow-Ballä
Support resting easily on the ground.
Þ Are you hitting the Mow-Ballä Support against
rocks, concrete driveways or other hard
obstacles? Try approaching them slowly, and
from different directions, to avoid unnecessary
wear.
Þ Are you trimming in sand or other abrasive soils?
The aluminum Mow-Ballä Support may be more
appropriate for your working con ditions. Call
1(800)DR-OWNER(376-9637) for advice and
assistance.
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 33
Parts List
Please refer to the schematic drawings on pages 36-37.
Ref # Part # Description
1 116891 Main Frame Orange, PRO
Model
1 139531 Main Frame Black, Comm.
Model
2 145531 Cast Bearing Housing Assembly
2H 145541 Head Assembly Complete
3 143641 Upper Handlebar, Comm. Model
3 144071 Upper Handlebar, PRO Model
4 143631 Lower Handlebar, Comm. Model
4 144061 Lower Handlebar, PRO Model
5 125141 Wheel Retaining Ring & Set
Screw
6 144101 Mow-Ball™ Support, Nylon
6a 121131 Aluminum Mow-Ball™ Support
8 114261 Axle
9 123951 Clevis, 3/16" x 1/2"
10 114031 Brake Actuator
11 114111 Idler Arm
12 115121 Brake Assembly
13 114681 Clutch/Brake Control
14 144571 Throttle Control with Cable, PRO
Model
14 144591 Throttle Control with Cable,
Comm. Model
15 114681 Hex Head Bolt, 1/4"-20 x 1-1/4"
16 143661 Handlebar Knob
18 139861 Wheel 16", Comm. Model
18 121321 Wheel 16" Resin, PRO Model
20 143691 Bail bar
21 119621 Brake Rod
22 143541 Backup Plate
23 116801 Rubber Stone Guard
24 131031 Stone Guard Clamp
25 120891 Idler Return Spring
26 118221 PTA Lever
27 143571 Line Spacer Plate
28 120521 Shield Assembly with Brackets
29 144081 Line Plate Stand-Off
Ref # Part # Description
30 121101 Axle Pivot Stud
31 144541 Carriage Bolt, 5/16" – 18 x 3"
32 120641 Bushing, 1/4"
33 117491 PTA Lever Vinyl Grip
34A 114251 PTA Latch Bracket Assembly
35 115001 Latch Bracket Only
36 118941 PTA Pin
36A 125341 PTA Pin, Spring, Clip Assembly
37 120901 PTA Spring
38 119591 PTA Snap Ring/Clip
39 118811 Wear Strip
40 115831 24 Heavy-Duty Cords (pre-cut)
41 115871 Roll of Heavy-Duty Cord
42 115811 24 Extra Heavy-Duty Cords (pre-
cut)
43 115861 Roll of Extra Heavy-Duty Cord
44 121661 Nylon Washer .180 thick
45 120771 Extension Spring, 2" x .52
46 121521 Plastic Axle Washer, .01"
47 118161 Key, 3/16" Square
48 121691 Flat Washer, 5/16"
49 144551 Bolt, HHCS, Gr. 5, 3/8"-16 x 3-
1/4"
50 125371 Engine Pulley with Set Screw
51 120171 Set Screw, 5/16"-18 x 5/16"
52 125381 Head Pulley
53 118691 Hex Nut, 5/16"
54 118731 Nylon Lock Nut 10-24
55 114621 Hex Head Bolt, 1/4"-20 x 2-1/2"
56 121701 Flat Washer, 3/8", SAE
57 112391 Flat Washer, 3/8" USS, for
Engine Pulley
58 120161 Set Screw 1/4"-20 x 3/8" Sq
Head
59 121551 Brake Pivot Washer
60 114431 V-Belt 1/2" x 45", 4L450
61 120101 Hex Head Screw, 10-24 x 5/8"
62 118641 Elastic Stop Nut, 1/4"-20
DR® TRIMMER/MOWER™ Assembly & Operating Instructions34
Ref # Part # Description
64 121591 Flat Washer, #10
65 118781 Elastic Stop Nut, 3/8"-16
66 110761 Elastic Stop Nut Axle 5/16"-18
67 114741 Hex Head Bolt, 5/16" – 18 x 2"
68 114761 Hex Head Bolt, 5/16-18 x 3-1/4"
69 114721 Hex Head Bolt, 3/8"-24 x 1/2"
70 119851 Hex Head Bolt, 3/8"-16 x 1-1/2"
71 119911 Shoulder screw
72 113071 Idler Pulley #1, Flat, 2-1/4"
74 119381 Belt Retainer
75 119231 Idler Pulley #2 (V shape)
76 121681 Rectangular Washer, Nylon
Mow-Ball only
77 114851 Handlebar U-Bolt
78 117471 Safety Goggles
79 113081 Electric Starter Switch
80 114861 U Bolt, 1/4"-20 x 3/4", for Switch
Plate
81 121191 Switch Mounting Plate
82 117811 Ignition Wiring Harness
83 135101 Battery Clamp, Nylon
84 131191 Battery
84 141351 Battery w/ Clamp Kit & Hardware
Ref # Part # Description
85 113051 Neoprene Battery Pad
86 143561 Anti-Wrap Can
87 119611 Plastic Rivet
88 120151 Round Head Screw, 10-24 x 2"
89 127421 Nylon Cable Clip
89 112141 6" Black Cable Tie
90 118111 Electric Start Key, Set of 2
91 118881 Brake Pad
92 133071 Flange Bolt, 1/4" – 20 x 7/8"
93 114411 Wheel Bearing, PRO Model only
94 115581 Bowden Clamp, Briggs &
Stratton Models
95 119821 Bowden Clamp Bolt, Briggs &
Stratton Models
96 120101 Screw, Wear Strip, 10-24 x 5/8"
97 114381 Bearing, 17mm
98 144531 Shaft, 17mm
99 143721 Handlebar Adjuster, Inside
100 143731 Handlebar Adjuster, Outside
101 143931 Handlebar Adjuster Spring
102 145801 Handlebar Adjuster Assembly
103 145541 Trimmer Head Assembly
Complete
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 35
Schematic Drawings
Figure 51
Figure 51
DR® TRIMMER/MOWER™ Assembly & Operating Instructions36
Figure 52
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 37
Figure 52
Notes
DR® TRIMMER/MOWER™ Assembly & Operating Instructions38
Notes
DR® TRIMMER/MOWER™ Assembly & Operating Instructions 39
Notes
DR® TRIMMER/MOWER™ Assembly & Operating Instructions40
Daily Checklist for the DR® TRIMMER/MOWER
X
To help maintain your DR® for optimum performance, we recommend you
follow this checklist each time you use your machine.
™
ü GAS: Fill the gas tank with clea n, fresh, unleaded gas. Be careful not to spill
gas on the engine shield. Gasoline will cloud the acrylic. If gas does spill on
the shield, rinse it imm e diately with s oap and wate r.
ü OIL: Check the oil level with the dipstick and add more if necessary (only add
oil to the level indicated on the dipstick—do not overfill). Use SAE 30 high
detergent oil.
ü SPARK PLUG: Clean the spark plug and replace if needed.
ü AIR FILTER: A clean air filter will mean a much easier-starting and better
running engine. You should replace the paper air filter after every 25 hours of
use, more frequently if you are trimming and mowing in dusty conditions.
ü ENGINE AIR COOLING SYSTEM: It is very important to keep the engine
clean of debris. Remove grass and other built-up materials from the air intake
screen before, during and after you mow. Regularly remove debris from the
blower housing and cooling fins. A dirty engine re tains heat and ca n cause
damage to the internal engine parts.
ü BELT: Check the belt for wear, proper alignment and tension.
ü CUTTING CORDS: Replace broken or frayed cords.
ü MOW-BALL
™
SUPPORT: Check the Mow-Ball™ Support for wear.
COUNTRY HOME PRODUCTS
Meigs Road, P.O. Box 25, Vergennes, Vermont 05491
1(800)DR-OWNER(376-9637) • www.DR-Owner.com ©2000 CHP, Inc. 144891
®
CODE:
30161
DR® TRIMMER/MOWER™ Assembly & Operating Instructions
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