McFarlane Universal Tillage COBRA 4200 Series Guide

OPERATION AND
PARTS MANUAL
Read and understand the manual. This manual provides in-
formation and procedures to safely operate and maintain
the Cobra 4200.
Learn more at www.mcfarlaneag.com
COBRA 4200 SERIES
Universal Tillage®
PART NUMBER: 15378 — Serial Number 22856 - higher
1Cobra 4200 Series Mcfarlaneag.com 888-627-8569

Table of Contents
Introduction 3
Contact Information 3
Safety 3
General 3
Safety Alert Symbols 4
Safety Icons Nomenclature 5
General Operating Safety 6
Towing Safety 6
Operation Safety 6
Assembly Safety 6
Maintenance Safety 6
Component Nomenclature 7
Component Locations 7
Specications 8
Hydraulic Requirements 8
Horsepower Range 8
Tillage Depths 8
Disk gang depth up to 4” (10.2 cm) 8
Tongue Weight 8
Overall Weight (GVWR) 8
Transport Width 8
Transport Height 8
Working Tillage Width (Cut Width) 8
Field Capacity (acre/hr @ 6-9 mph) 8
Towing Speed 8
Display of Hazard and Info Signs 9
Towing 11
General Safety 11
Safety Chain 12
Bystanders 12
Towing and Maximum Towing Speed 12
Highway and Transport Operations 12
Pre-towing Checklist 13
Safety 14
Prior to Connecting Unit 14
Tow Chain 14
Connecting to the Tractor 15
Operation 18
Safety 18
Initial Setup 18
Disk Gang Adjustment 19
Machine Leveling 20
Dura-Reel Adjustment 22
Spur-Till Operation and Adjustment 25
Preparing for Transport 26
Maintenance 27
Safety 27
Tire and Lug Torque Specications 28
Bolt Torque Chart 28
Maintenance Schedule 29
Maintenance Procedures 31
Assy/Lubrication Dura-Reel Hub 31
Lubrication Locations Drawing 32
Hydraulic Component Safety 33
Tire Safety 33
Storage 34
Safety 34
Power wash the unit prior to storage 34
Placing Into Storage (Disk Coatings) 35
Warranty 35
Limited Warranty Statement 35
Serial Number Location 35
Troubleshooting 36
Parts Section 37
Ordering Parts 37
Dealer Contact Information 37
Decals 37
PartsDrawings 38
2Cobra 4200 Series Mcfarlaneag.com 888-627-8569

Introduction
The 4200 Series Cobra from McFarlane Mfg. is our latest
development in Universal Tillage®and can satisfy all
of the demands of today’s farming practices, especially
BT corn and corn on corn cropping. This tool features
wavy, serrated Cobra disk blades, loosens the top one to
four inches of the soil yet leaves the seedbed rm. This
ensures accurate seed depth at planting, resulting in even
emergence and better yields. Smoothing uneven ground
and removing small weeds are done quickly at the 7-9mph
operating speeds.
The Cobra is available in a 12’ and 14’ wide rigid frame,
as well as 20’, 25’, 30’ 35’ and 45’ folding frames. The
horsepower required to pull the Cobra is approximately 8-9
hp per foot of width. Therefore the 12’ Cobra requires as
little as 100 hp while the 45’ requires up to 405 hp.
Contact Information
If you have questions not answered in this manual, require
additional copies, or the manual is damaged, please
contact your local dealer or:
McFarlane Mfg. Co., Inc.
1330 Dallas Street
P.O. Box 100
Sauk City, WI 53583
Phone: [phone]
Toll Free: [phone]
Fax: [phone]
E-mail: [email protected]
Web: www.mcfarlaneag.com
Safety
General
Safety of the operator and bystanders is one of the main
concerns in designing and developing a new piece of
equipment. Designers and manufacturers build in as
many safety features as possible. However, every year
many accidents occur which could have been avoided by
a few seconds of thought and a more careful approach to
handling the equipment.
Most work related accidents are caused by failure to
observe basic safety rules or precautions. An accident
can often be avoided by recognizing potentially hazardous
situations before an accident occurs. As you assemble,
operate, tow, or maintain the Cobra (unit), you must be alert
to potential hazards. You should also have the necessary
training, skills, and tools to perform any assembly or
maintenance procedures.
Improper operation and maintenance of this unit could
result in a dangerous situation that could cause injury or
death.
WARNING
Do not use or tow the unit until you read and
understand the information contained in this
manual.
Safety precautions and warnings are provided in
this manual and on the unit. If these hazard
warnings are not heeded, bodily injury or death
could occur to you or to other persons.
McFarlane cannot anticipate every possible circumstance
that might involve a potential hazard. The warnings in this
manual and on the product are, therefore, not all-inclusive.
If a method of operation not specically recommended by
us is used, you must satisfy yourself that it is safe for you
and for others. You should also ensure that the unit will not
be damaged or be made unsafe by the methods that you
choose.
The information, specications, and illustrations in this
manual are based on the information that was available at
the time this material was written and can change at any
time.
3Cobra 4200 Series Mcfarlaneag.com 888-627-8569

Safety Alert Symbols
This is the safety alert symbol. It is used to alert
you to potential personal injury hazards. Obey all
safety messages that follow this symbol to avoid
possible injury or death.
This manual contains DANGERS, SAFETY
INSTRUCTIONS, CAUTIONS, IMPORTANT NOTICES,
and NOTES which must be followed to prevent the
possibility of improper service, damage to the equipment,
personal injury, or death. The following key words call the
readers attention to potential hazards.
Hazards are identied by the “Safety Alert Symbol” and
followed by a signal word such as “DANGER”, “WARNING”,
or “CAUTION”.
DANGER
Indicates an imminently hazardous situation which, if
not avoided, will result in death or serious injury. This
signal word is limited to the most extreme situations.
WARNING
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
NOTICE
Indicates that equipment or property damage can result if
instructions are not followed.
SAFETY
INSTRUCTIONS
Safety instructions (or equivalent) signs indicate
specicsafety-relatedinstructionsorprocedures.
NOTE: Contains additional information important to a
procedure.
4Cobra 4200 Series Mcfarlaneag.com 888-627-8569

Safety Icons Nomenclature
This manual and the equipment
has numerous safety icons. These
safety icons provide important
operating instructions which alert
you to potential personal injury
hazards.
Personal Protection/Important
Information
Read the manual
Maintenance procedure
Crush hazard
Eye protection
Hand protection
Head protection
Hearing protection
Inspect equipment
OEM
OEM
OEM parts only
Place in neutral
Protective shoes
Remove key
N
I
NG
AR Damaged hazard label
Set parking brake
Slow vehicle placard
STOP
Stop engine
Support stand usage
Use proper tools
Visually inspect
Prohibited Actions
Do not alter or modify
Do not leave out tools
Do not weld
No alcohol
No children
No drugs
No open flame
No passengers
No riders
No smoking
Hazard Avoidance
Block wheels
Crushing hazard (body)
Crush hazard (foot)
Crush hazard (rolling over)
Defective or broken part
Entanglement hazard
Explosive separation hazard
Falling hazard
Fire hazard
High-pressure fluid hazard
Hose damage
Hot surface
Maintain safe distance
Overturn hazard
Pinch point hazard
Pressure alert / check
pressure
Projectile hazard
Safety alert symbol
Sharp object hazard
Slipping injury
Tripping injury
0
Zero pressure
5Cobra 4200 Series Mcfarlaneag.com 888-627-8569

General Operating Safety
WARNING
Read And Understand Manual
To prevent personal injury or even death, be sure
you read and understand all of the instructions in
this manual and other related OEM equipment
manuals! This equipment is dangerous to children and
persons unfamiliar with its operation. The operator
should be a responsible adult familiar with farm
machinery and trained in this equipment’s operations.
Do not allow persons to operate or assemble this unit
until they have read this manual and have developed a
thorough understanding of the safety precautions and
how it works.
Thisunitwasdesignedforaspecicapplication;DO
NOT modify or use this unit for any application other
than which it was designed.
Units operated improperly or by untrained personnel
can be dangerous!
N
I
NG
AR Hazard And Information Signs
Replaceanymissingorhard-to-readdecals.
Decal placement and part numbers can be found
in the Nomenclature section of this manual.
Damaged Parts Hazard
Do not use this unit if it is in need of repair. If
you believe the unit has a defect which could
cause damage, injury, or death, you should
immediately stop using the unit.
Fall Hazard
Do not use the unit as a work platform. Do
not stand on top of the unit at any time. Do
not ride on the unit or allow others to ride on it.
Entanglement Hazard
Donotwearloosettingclothingwhichmay
become entangled in moving parts.
STOP Crush Hazard (Rolling Over)
When disconnecting the unit or leaving the
operator’s seat:
1. Stop the tractor or towing vehicle.
2. Shut off the engine and remove the ignition key.
3. Set the brakes.
4. Make sure wheel cylinder transport locks are
attached.
5. Relievehydraulicuidpressure.
6. If parking the unit, make sure jack stand is
lowered and retaining pin is installed.
Injury Hazard
Do not permit children to play on or around the
stored unit.
WARNING
Impaired Operator Hazard
Do not attempt to operate this unit under
theinuenceofdrugsoralcohol.Review
the safety instructions with all users annually.
Personal Protection Equipment
When working around or operating this unit, wear
appropriate personal protective equipment. This list
includes but is not limited to:
• A hard hat
• Protective shoes with slip resistant soles
• Protective goggles, glasses, or face shield
• Heavy gloves and protective clothing
Safe Distance
Keep all bystanders, especially children, away
from the unit while in operation.
SAFETY
INSTRUCTIONS
To prevent injury, use a tractor equipped with a
Roll Over Protective System (ROPS).
Visually Inspect
Visually inspect the unit for any loose bolts,
worn parts, or cracked welds, and make
necessary repairs before using the unit.
Towing Safety
For towing safety information, refer to the Towing section.
Operation Safety
For operating safety information, refer to the Operation
section.
Assembly Safety
For assembly safety information, refer to the separate
Assembly manual.
Maintenance Safety
For maintenance safety information, refer to the
Maintenance section.
6
Cobra 4200 Series Mcfarlaneag.com 888-627-8569

Component Nomenclature
Component Locations
The Cobra is comprised of four components: (1) disk
gangs, (2) wavy coulter and center covering disks, (3),
Dura-Reel® and (4) nishing option (Spur-Till with a single
rolling basket, 3-bar harrow with a single rolling basket,
5-bar harrow or double rolling basket).
NOTICE
In high residue situations, maximum down pressure on
the disks is required to more completely cut the residue.
In creating the maximum down pressure, make sure the
C-spring stops do not constantly contact the frame, as this
will cause equipment damage.
7Cobra 4200 Series Mcfarlaneag.com 888-627-8569

Specications
Hydraulic Requirements
This unit operates with hydraulic pressures of 2500 to 3000
psi (170 to 205 bars).
Horsepower Range
CB-4212-STRB — 96 to 108
CB-4214-STRB — 112 to 126
CB-4220-STRB — 160 to 180
CB-4225-STRB — 200 to 250
CB-4230-STRB — 240 to 270
CB-4235-STRB — 280 to 315
CB-4245-STRB — 360 to 405
Tillage Depths
Disk gang depth up to 4” (10.2 cm)
Tongue Weight
Tongue weight of the unit is approximately 700 lbs. (318 kgs)
Overall Weight (GVWR)
CB-4212-STRB — 7,544
CB-4214-STRB — 8,091
CB-4220-STRB — 13102
CB-4225-STRB — 15,719
CB-4230-STRB — 17,193
CB-4235-STRB — 21,053
CB-4245-STRB — 27,688
Transport Width
CB-4212-STRB — 13’9”
CB-4214-STRB — 14’8”
CB-4220-STRB — 13’4”
CB-4225-STRB — 15’4”
CB-4230-STRB — 15’4”
CB-4235-STRB — 17’4”
CB-4245-STRB — 19’2”
Transport Height
CB-4212-STRB — N/A
CB-4214-STRB — N/A
CB-4220-STRB — 9’6”
CB-4225-STRB — 10’5”
CB-4230-STRB — 12’0”
CB-4235-STRB — 13’6”
CB-4245-STRB — 13’6”
Working Tillage Width (Cut Width)
CB-4212-STRB — 12’3”
CB-4214-STRB — 14’2”
CB-4220-STRB — 19’10”
CB-4225-STRB — 25’8”
CB-4230-STRB — 30’2”
CB-4235-STRB — 35’9”
CB-4245-STRB — 45’8”
FieldCapacity(acre/hr@6-9mph)
CB-4212-STRB — 7-11
CB-4214-STRB — 10-12
CB-4220-STRB — 14-19
CB-4225-STRB — 18-24
CB-4230-STRB — 22-28
CB-4235-STRB — 26-33
CB-4245-STRB — 26-46
Towing Speed
Towing speeds should not exceed 20 mph (32 kph)
Field operating speeds should be 7-9 mph (11-14 kph).
8
Cobra 4200 Series Mcfarlaneag.com 888-627-8569

Instructions for Display of Hazard and
Informational Signs
• It is the responsibility of the customer to know the
lighting and marking requirements of the local highway
authorities and to install and maintain the equipment
to provide compliance with the regulations. Add extra
lights when transporting at night or during periods of
limited visibility.
• Keep safety signs clean and legible at all times.
Replace safety signs that are missing or have become
illegible.
• Do not paint over, remove, or deface any safety signs
or warning decals on your equipment. Observe all
safety signs and practice the instructions on them.
• Replacement parts that display a safety sign should
display the same sign.
• Make sure the hazard warning labels or other
information decals are legible and attached to the unit
before use.
• Safety signs are available from your Distributor, Dealer
Parts Department, or the factory.
9Cobra 4200 Series Mcfarlaneag.com 888-627-8569

A B C D E F G
↔Each mark represents a 1” change in disk depth.
1 Turn = 1/2”
Deeper
WARNING
Cancer and Reproductive Harm
www.P65Warnings.ca.gov
SAFETY AND MAINTENANCE LOCK:
SEE OPERATOR’S MANUAL FOR USE.
NOTICE
 READ AND UNDERSTAND THE OPERATOR’S
MANUAL BEFORE USING.
 TRANSPORT LOCKUPS AND WING LOCK
PINS MUST BE USED DURING TRANSPORT.
 DO NOT RUN THE DISK GANGS TO A DEPTH
GREATER THAN 4 (FOUR) INCHES.
 MAXIMUM FIELD TRAVEL SPEED IS 9 MPH.
DC-306
14039
14050
14051
DC-224
DC-231
10Cobra 4200 Series Mcfarlaneag.com 888-627-8569

NOTICE
Tractor must be in
constant flow mode.
Do not exceed 250 PSI
during field operation.
14671
Assembly
Refer to the separate Cobra Assembly manual for complete
assembly instructions.
The assembly process consists of attaching the hitch to
the main frame and attaching the lift arm/rolling basket
subassemblies to the frame.
Approximate time to set up: 12’-14’ = 2-4 hours, 20’-30’ =
4-6 hours, 35’-45’ = 8-10 hours
Towing
General Safety
SAFETY
INSTRUCTIONS
Towing the Cobra requires care! Both the unit
and tow vehicle must be in good working
condition. Securely attach to towing unit. Use a
high strength, appropriately sized hitch pin with a
mechanical retainer and attach safety chain.
Make sure the hitch and coupling on the towing
vehicle are rated equal to, or greater than, the
unit’s “gross vehicle weight rating” (GVWR).
Refertothespecicationsection.
Make sure the safety chain is securely fastened
to the tow vehicle.
Checkthetiresfortreadwear,inationpressure,
and overall condition.
Inspect the hitch and coupling for wear or
damage. DO NOT tow the unit using a defective
hitch or coupling!
Make sure directional, brake, and running lights
are connected and working properly.
Make sure the lug nuts holding the wheels are
tight(torquetospecications)andthatnoneare
missing.
When towing the unit on the highway, make sure
the “Slow Moving Vehicle” placard is clearly
visible.
Do not allow anyone to stand between the tongue
or hitch and the towing vehicle when backing up
to the equipment.
Make sure that the area is clear of children,
animals, and other obstacles before using.
11Cobra 4200 Series Mcfarlaneag.com 888-627-8569

Safety Chain
SAFETY
INSTRUCTIONS
• If the unit will be transported on a public highway, the
safety chain must be attached to the tow vehicle.
• Always follow state and local regulations
regarding a safety chain when towing farm
equipment on a public highway.
• Be sure to check with local law enforcement
agencies for any local regulations or restrictions.
• Do not use any device other than the safety chain that
was supplied with the unit. Only a safety chain (not an
elastic or nylon/plastic tow strap) should be used to
retain the connection between the tow vehicle and the
unit in the event of separation of the primary attaching
system.
Bystanders
SAFETY
INSTRUCTIONS
• Beware of physical surroundings and especially
bystanders, particularly children, before moving
the unit! This is particularly important with higher
noise levels and quiet cabs, as you may not
hear people shouting.
• NO PASSENGERS ALLOWED - Do not
carry passengers anywhere on or in the
tractor, except as required for operation.
• Do not allow anyone to ride on the unit while it
is moving.
Towing and Maximum Towing Speed
SAFETY
INSTRUCTIONS
• Operate the towing vehicle from the operator’s seat
only.
• Do not exceed a towing speed of more than 20 mph
(0.5 KPH) on a public roadway.
• Remember, tires supplied by the manufacturer
are designed to operate LESS THAN 20 mph. Do
not exceed or tire failure may occur.
Highway and Transport Operations
SAFETY
INSTRUCTIONS
• Make sure the wheel cylinder transport locks are
installed, the wing lock pins are in place, and the jack
stand is in its storage position before transporting the
unit.
SAFETY
INSTRUCTIONS
• Never use independent braking with unit in tow as loss
of control and/or upset of unit may result.
• Always drive at a safe speed relative to local conditions
and ensure that your speed is low enough for an
emergency stop to be safe and secure. Keep speed to
a minimum.
• Reduce speed prior to turns to avoid the risk of
overturning.
• Avoid sudden uphill turns on steep slopes.
• Always keep the tractor or towing vehicle in gear to
provide engine braking when going downhill. Do not
coast.
• Use approved accessory lighting or ags and
necessary warning devices to protect operators of
other vehicles on the highway during daylight and
nighttime transport. Various safety lights and devices
are available from your dealer.
• The use of ashing amber lights is acceptable in most
localities. However, some localities prohibit their use.
Local laws should be checked for all highway lighting
and marking requirements.
• When driving the tractor and equipment on the road or
highway, use ashing amber warning lights and a slow
moving vehicle (SMV) identication emblem.
• Be a safe and courteous driver. Always yield to
oncoming trafc in all situations, including narrow
bridges, intersections, etc. Plan your route to avoid
heavy trafc.
• Be observant of bridge loading ratings. Do not cross
bridges rated lower than the gross weight at which you
are operating.
• Watch for obstructions overhead and to the side while
transporting.
• Always operate equipment in a position to provide
maximum visibility at all times. Make allowances for
increased length and weight of the equipment when
making turns, stopping, etc.
12Cobra 4200 Series Mcfarlaneag.com 888-627-8569

Pre-towingChecklist
1. Before towing, make sure the maintenance on the
tractor and the unit are current. This is very important
because towing puts additional stress on the tow
vehicle.
2. Check and correct the tire pressures on the tow
vehicle and the unit. Refer to the Tire and Lug Torque
specication chart in the manual.
3. Make sure the hitch, coupler, and any other equipment
that connects the unit and the tow vehicle are properly
secured and adjusted. Always inspect the hitch and
tongue for cracks when hooking up.
WARNING
Substandard Parts Hazard
If towing the unit with a draw bar, use only an
OEMcertied,hardeneddrawbarpinwitha
retainer clip. Do not use homemade pins, bolts, or any
other type of retaining device. Always install the
retainer clip, making sure the hitch and unit are
securely fastened to the tow vehicle.
Using a pin not intended for this type of towing, can
result in unexpected separation of the unit from the
tow vehicle resulting in equipment damage and
personal injury.
4. Verify the appropriate Category 3 or Category 4 hitch is
securely installed.
WARNING
Unexpected Separation Hazard
If the safety chains do not have a current
certicationtag,donotusetheunituntil
properlycertiedchainsareinstalled.Substandard
safety chains could allow the unit to separate from the
tow vehicle resulting in equipment damage and
personal injury.
5. Attach the safety chain from the unit to the tow vehicle.
The safety chain should be long enough for tight turns.
Don’t allow the chain to drag on the pavement because
it will wear the chain links causing an unsafe condition.
6. Make sure the electrical wiring harness for the running
lights and taillights is properly connected and not
touching the road, but loose enough to make turns
without disconnecting or damaging the wires.
7. Have an observer conrm all running lights, brake lights,
turn signals, and hazard lights are working on both the
tow vehicle and the unit.
8. Verify the brakes on the tow vehicle are operating
correctly.
9. Make sure transport locks are securely in place around
the cylinder rods.
10. Make sure the jack stand is raised and locked in the
storage position.
11. Make sure the wing lock pins are in place.
12. Check mirrors of the tow vehicle to make sure you have
good visibility.
13. Check routes and restrictions on bridges and tunnels.
13Cobra 4200 Series Mcfarlaneag.com 888-627-8569

Safety
SAFETY
INSTRUCTIONS
Make sure that anyone who will be operating the unit or
working on or around the unit reads and understands
all the operating, maintenance, and safety information
in the operator’s manual and other related OEM
equipment manuals before using or towing the unit.
Prior to Connecting Unit
Make sure the unit is resting on the ground or the
transport locks are securely installed over the wheel
cylinder rods before attaching the unit to the tractor.
SAFETY
INSTRUCTIONS
If the unit is not resting on the ground, make
surewheelchocksaresecurelyttedonboth
sides of each wheel.
WARNING
Crush Hazard
The tongue weight of the unit is
approximately700lbs.(318kgs.).Use
care when lifting or attaching the unit to the tractor.
Never place any part of your body under the tongue or
hitch assembly.
Hydraulic Pressure
This unit operates with hydraulic pressures of
2500 to 3000 psi (170 to 205 bars).
High-Pressure Fluids
1. Check or tighten all connections BEFORE
pressurizing system.
0
2. Release all pressure before removing hoses
and/or valves by:
a. Stopping engine.
 b. Holdinghydrauliccontrolleversinoator
neutral position.
3. DO NOT use your bare hand to check for
potential leaks. Always use a board or
cardboard when checking for a leak.
Escapinghydraulicuidunderpressure,evena
pinhole size leak, can penetrate body tissue, causing
seriousinjuryandpossibledeath.Ifuidisinjected
into your skin, it must be treated immediately by a
doctor familiar with this type of injury.
Tow Chain
A
certied tow chain is supplied with each unit. This chain
must be attached to the tractor during towing or operation
of the unit.
SAFETY
INSTRUCTIONS
Inspect the chain annually for wear or damage.
OEM
OEM
Do not replace the chain with anything other
thananOEMcertiedreplacement.
14Cobra 4200 Series Mcfarlaneag.com 888-627-8569

Connecting to the Tractor
1. Raise the jack stand and connect the tongue to the
tractor. The tongue weight of the unit is approximately
700 lbs. (318 kgs).
Note: If a drawbar pin is used, it should be an OEM
certied pin and retainer clip. On category 3 pintle
hitches use a 1-1/2” (38 mm) pin. On category 3
clevis hitch use a 1-1/4” (32 mm) pin. On category 4
articulating ball pintle hitch use a 2” (51 mm) pin.
WARNING
Unexpected Separation Hazard
If towing the unit with a drawbar, use only a
certied,hardeneddrawbarpinwitharetainer
clip. Do not use homemade pins, bolts, or any other
type of retaining device. Always install the retainer clip,
making sure the hitch and unit are securely fastened to
the tow vehicle.
Using a pin not intended for this type of towing can
result in unexpected separation of the unit from the tow
vehicle, resulting in equipment damage and personal
injury.
2. Connect the hitch of the unit to the tractor. Attach the tow
chain to the tractor’s draw bar cage.
Note: When connected, make sure the retaining plate
securely locks the chain link in place.
3. Remove the jack stand and place it in its storage
position inside the frame, as shown.
15Cobra 4200 Series Mcfarlaneag.com 888-627-8569

1. Remove the hydraulic hoses from their storage position.
2. Connect the hydraulic hoses to the tractor.
Note: The most commonly used function of the unit is the
“main lift” cylinders, which raises and lowers the
wheels. Connect the hydraulic hoses for this function
into the port (control lever) used most commonly.
3. Disconnect the electrical connection for the rear lights
from the storage socket.
a. Rotate the plug.
16Cobra 4200 Series Mcfarlaneag.com 888-627-8569

17Cobra 4200 Series Mcfarlaneag.com 888-627-8569
b. Push the plug upward and slightly rotate it again to
release it from the socket.
c. Pull the plug downward.
d. Connect the plug into the tractor’s electrical socket.
1. Make sure all the hydraulic cylinders are functioning
properly.
2. Make sure the amber and red indicator lights are
working properly.
3. Move the unit to the desired location and position it for
operation following the towing recommendation provided
in this manual and/or any other local, State, or Federal
regulations that may apply.

18Cobra 4200 Series Mcfarlaneag.com 888-627-8569
Operation
Safety
WARNING
To prevent serious injury or death, follow these safety
instructions
Entanglement Hazard
Keep hands and clothing clear of moving parts.
Crush Hazard (Rolling Over)
Do not clean, lubricate, or make adjustments
while the unit is moving.
STOP Crush Hazard (Rolling Over)
When making adjustments to the
unit or leaving the operator’s seat:
1. Stop the tractor.
2. Shut off the engine and remove the ignition key.
3. Set the brakes.
Overturn Hazard
Pick the levelest possible route when
transportingacrosselds.Avoidtheedgesof
ditches or gullies and steep hillsides.
Safe Distance
Keep all bystanders, pets, and livestock clear of
the work area, particularly when raising or
lowering the unit.
SAFETY
INSTRUCTIONS
Periodically clear the unit of brush, twigs, or
other materials to prevent buildup of dry,
combustible materials.
NOTICE
DO NOT turn while the unit is in the ground.
DO NOT operate the unit in frozen ground.
Initial Setup
The McFarlane Cobra is a tool that is designed to
handle a wide variety of eld conditions. It has many
adjustments that can be made to change the performance
of each component on the unit as well as its overall
performance. Achieving the best results over the widest
range of circumstances can be accomplished by making
adjustments to match the eld conditions.
Note: It is important to make one adjustment at a time in
order to see the results of each change. If several
adjustments are made at the same time, the
operation of the machine can change dramatically,
creating confusion and frustration.
WARNING
Pinch Point Hazard
Donotplacehandsorngersbetweenmoving
and/or stationary parts. The weight of the unit
will easily cause serious bodily injury.
Sharp Object Hazard
Do not place any part of your body under the
disk gang during the adjustment process.
Severe injury will occur if a person contacts
or falls under the disk gang.
1. If equipped with wings, remove the wing fold lock pins
and bridge pins and store them on the hitch storage
bracket.

19Cobra 4200 Series Mcfarlaneag.com 888-627-8569
2. If necessary, raise the unit and release the transport
locks from both wheel cylinders.
a. Remove the retainer clip and rotate the lock plate
upward.
b. Now pull up on the release lever and pull back to
release the transport locks from the cylinder.
c. Lock the release lever in the locked position, lower
the locking plate, and reinstall the retainer clip.
Disk Gang Adjustment
3. Adjust the disk gang angle by repositioning the retainer
pins and moving the disk gang into the desired position
using the following procedure.
Note: On models with wings, make sure the disk gang
wing is unfolded before starting the adjustment
procedure.
a. Lower the disk gang close to the ground but not
touching.
Do not place any part of your body
under the disk gang.
WARNING
To prevent serious injury or death from rolling over or
crushing during the setup procedure:
STOP
Stop tractor’s engine.
PSet parking brake.
Remove ignition key.
Block wheels of unit.
b. Stop the tractor, shut off the engine, set the parking
brake, and remove the ignition key from the tractor.
c. Release the wire retainer clips and remove the
retainer pins.
d. Adjust the disk gang to the desired angle.

20Cobra 4200 Series Mcfarlaneag.com 888-627-8569
The 5° angle is the least aggressive setting and is
typically used with higher speeds and smaller amounts
of residue.
The 10° angle is the most aggressive setting and is
used for heavy or difcult residue. This setting also
requires the most horsepower. It may also be
necessary to reduce the speed at this steeper gang
angle to prevent ridging.
Note: Begin tilling with the disk gang angle set at 7.5°.
If necessary, after operating the unit, increase or
decrease the aggressiveness of the disk gangs
per the condition of the soil. To prevent ridging,
it may be necessary to reduce the travel speed
with more aggressive disk angles.
f. Set the remaining disk gangs to the same angle.
Reinstall the two retainer pins and fasten the wire
retainer clips.
4. Start the tractor and use the tractor’s control lever to
lower the wheels (raise the disk gang) to the maximum
height.
5. Begin to pull the unit through the eld.
6. Slowly raise the wheels until the disks contact the
ground.
7. Continue raising the wheels (lowering the unit) until the
disks are cutting into the ground.
Machine Leveling
Once the desired depth is reached (no more than 4 inches),
the unit must be leveled by adjusting the frame leveling
turnbuckle.
Raise the locking mechanism from the turnbuckle.