John Deere 903KH, 909KH Harvester Service Manual TM11623

903KH and 909KH Tracked
Harvester Diagnostic
OPERATION AND TEST MANUAL
Track models 903KH, 909KH
For complete service information also see:
TM11623 26 FEB 15 (ENGLISH)
903KH and 909KH Tracked Harvester RepairTM11626
JDLink (MTG) Technical ManualTM114519
Alternators and Starting MotorsCTM77
PowerTech 9.0L OEM Diesel Engines 6090 Tier 3 / Stage IIIA Emissions
Certiﬁed Base Engine RepairCTM400
PowerTech 6090 Diesel Engine Level 14 ElectronicFuel System with the Denso
High Pressure Common Rail (HPCR) Level 14 ECUCTM385
Super Caddy Oil Cleanup ProcedureCTM310
120 Series Hydraulic CylindersCTM120519
120 Series Hydraulic CylindersCTM114319
COOLANT HEATER SERVICE MANUALCTM10090X19
JDLINK/ZXLINK Machine Monitoring SystemCTM10006
John Deere Construction and Forestry
Pinted by Belgreen

<- Go to Global Table of contents
TM11623-OPERATION AND TEST MANUAL
(g) by Belgreen v2.5
Table of contents
FOREWORD
Section 9000 - GENERAL INFORMATION
Group 01. - Safety
Section 9001 - DIAGNOSTICS
Group 20 - Engine Control Unit (ECU) Diagnostic Trouble Codes
Group 30 - Advanced Display Unit (ADU) Diagnostic Trouble Codes
Group 40 - Sealed Switch Module (SSM) Diagnostic Trouble Codes
Group 50 - Cab Control Unit (CCU) Diagnostic Trouble Codes
Group 60 - Transmission Control Unit (TCU) Diagnostic Trouble Codes
Group 70 - Hydraulic Control Unit (HCU) Diagnostic Trouble Codes
Section 9005 - OPERATIONAL CHECKOUT PROCEDURE
Group 10 - Operational Checkout Procedure
Section 9010 - ENGINE
Group 05 - Theory of Operation
Group 15 - Diagnostic Information
Group 25 - Tests
Section 9015 - ELECTRICAL SYSTEM
Group 05 - System Information
Group 10 - System Diagrams
Group 15 - Sub-System Diagnostics
Group 16 - Monitor Operation
Group 20 - References
Section 9020 - POWER TRAIN
Section 9025 - HYDRAULIC SYSTEM
Group 25 - Tests
Section 9031 - HEATING AND AIR CONDITIONING
Group 25 - Tests

<- Go to Global Table of contents TM11623-OPERATION AND TEST MANUAL

<- Go to Section TOC
GENERAL INFORMATION
Section 9000 page 1
Foreword
This manual is written for an experienced technician. Essential tools required in performing certain service work are identified in
this manual and are recommended for use.
Live with safety: Read the safety messages in the introduction of this manual and the cautions presented throughout the text
of the manual.
CAUTION:
This is the safety-alert symbol. When you see this symbol on the machine or in this manual, be alert to the potential for
personal injury.
Technical manuals are divided in two parts: repair and operation and tests. Repair sections tell how to repair the components.
Operation and tests sections help you identify the majority of routine failures quickly.
Information is organized in groups for the various components requiring service instruction. At the beginning of each group are
summary listings of all applicable essential tools, service equipment and tools, other materials needed to do the job, service
parts kits, specifications, wear tolerances, and torque values.
Technical Manuals are concise guides for specific machines. They are on-the-job guides containing only the vital information
needed for diagnosis, analysis, testing, and repair.
Fundamental service information is available from other sources covering basic theory of operation, fundamentals of
troubleshooting, general maintenance, and basic type of failures and their causes.

<- Go to Global Table of contents
Section 9000 - GENERAL INFORMATION
Table of contents
Group 01. - Safety .................................................................................................................................... 1
Information for European Union Directives Compliance ....................................................................... 1
Recognize Safety Information ............................................................................................................... 3
Follow Safety Instructions ..................................................................................................................... 4
Operate Only If Qualified ...................................................................................................................... 5
Wear Protective Clothing ...................................................................................................................... 6
Avoid Unauthorized Machine Modifications .......................................................................................... 6
Inspect Machine ................................................................................................................................... 6
Stay Clear of Moving Parts ................................................................................................................... 7
Avoid High-Pressure Oils ...................................................................................................................... 7
Avoid High-Pressure Fluids ................................................................................................................... 8
Work In Ventilated Area ........................................................................................................................ 8
Handle Starting Fluid Safely ................................................................................................................. 9
Prevent Fires ........................................................................................................................................ 9
In Case of Machine Fire ...................................................................................................................... 10
Prevent Battery Explosions ................................................................................................................. 10
Handle Chemical Products Safely ....................................................................................................... 11
Dispose of Waste Properly .................................................................................................................. 11
Prepare for Emergencies .................................................................................................................... 12
Clean Debris from Machine ................................................................................................................ 12
Control Pattern ................................................................................................................................... 13
Use Steps and Handholds Correctly ................................................................................................... 13
Start Only From Operator′s Seat ......................................................................................................... 13
Use and Maintain Seat Belt ................................................................................................................ 14
Avoid Work Site Hazards .................................................................................................................... 14
Prevent Unintended Machine Movement ............................................................................................ 16
Operate Machine Safely ..................................................................................................................... 17
Avoid Machine Tip Over ...................................................................................................................... 19
Keep Riders Off Machine .................................................................................................................... 20
Use Care When Swinging Machine ..................................................................................................... 20
Operate Hoist (Boom) With Care ........................................................................................................ 21
Avoid Backover Accidents .................................................................................................................. 21
Operating On Slopes ........................................................................................................................... 21
Add and Operate Attachments Safely ................................................................................................ 22
Travel Safely ....................................................................................................................................... 22
Avoid Power Lines .............................................................................................................................. 22
Operating or Traveling On Public Roads ............................................................................................. 23
Inspect and Maintain ROPS ................................................................................................................. 23
Park and Prepare for Service Safely ................................................................................................... 24
Service Machines Safely ..................................................................................................................... 24
Service Cooling System Safely ........................................................................................................... 25
Service Accumulator Systems Safely .................................................................................................. 25
Remove Paint Before Welding or Heating ........................................................................................... 26
Make Welding Repairs Safely ............................................................................................................. 26
Drive Metal Pins Safely ....................................................................................................................... 27

Section 9000 - GENERAL INFORMATION Group 01.: Safety
Section 9000 page 1
Group 01. - Safety
Information for European Union Directives Compliance
To the Customer
Sound and Vibration Specifications
Product Identification Number (PIN), CE Mark, and EU Flex Label Locations
[1] - Sound levels:
The operator sound pressure levels for the 903KH and 909KH are 71 dB(A) or less with properly maintained machines.
Sound levels were obtained using the test method specified per ISO 6394:2008.
[2] - Vibration levels:
The operator vibration levels for the 903KH and 909KH with properly maintained machines operating on a flat dirt area
free of large objects such as trees and rocks are: • Whole Body: 0.31 m/s 2 or less Vibration levels were obtained using
the test method specified per ISO 2631-1:1997.
Effective June, 1998, all machines sold in the European Union must comply with the machinery directive 98/37/EC and any
amendments. Each machine meeting these requirements must bear the conformity mark CE. In addition, each machine must
be accompanied with a Declaration of Conformity by the machine manufacturer. This declaration must be kept with the
machine at all times and does not declare conformity to national road regulations.
→NOTE:
This machine may need country approval for travel on public roads in Europe as some European countries
require special equipment and approvals.

Section 9000 page 2
PIN Plate and CE Mark Location
LEGEND:
1PIN Plate Location
2CE Mark and EU Flex Label Location
The machine is identiﬁed by the PIN that is stamped on a serial number plate. The PIN plate (1), CE mark, and EU ﬂex label (2)
are located in the middle section of the machine.

Section 9000 page 3
PIN Plate
EU Flex Label
CE Mark Plate — * Shows year of manufacture

Section 9000 page 4
Follow Safety Instructions
Recognize Safety Information
Safety Alert Symbols
Safety Alert Symbols
This is the safety alert symbol. When you see this symbol on your machine or in this manual, be alert for the
potential of personal injury.
Follow the precautions and safe operating practices highlighted by this symbol.
A signal word — DANGER, WARNING, or CAUTION — is used with the safety alert symbol. DANGER identiﬁes the most serious
hazards.
On your machine, DANGER signs are red in color, WARNING signs are orange, and CAUTION signs are yellow. DANGER and
WARNING signs are located near speciﬁc hazards. General precautions are on CAUTION labels.
Safety Messages
Carefully read all safety messages in this manual and on your machine safety signs. Keep safety signs in good condition.
Replace missing or damaged safety signs. Be sure new equipment components and repair parts include the current safety
signs. Replacement safety signs are available from your John Deere dealer.
There can be additional safety information contained on parts and components sourced from suppliers that is not reproduced in
this operator′s manual.
Learn how to operate the machine and how to use controls properly. Do not let anyone operate without instruction.

Section 9000 page 5
Keep your machine in proper working condition. Unauthorized modifications to the machine may impair the function and/or
safety and affect machine life.
If you do not understand any part of this manual and need assistance, contact your John Deere dealer.
Do not operate this machine unless you have read the operator′s manual carefully and you have been qualified by supervised
training and instruction.
Familiarize yourself with the job site and your surroundings before operating. Try all controls and machine functions with the
machine in an open area before starting to work.
Know and observe all safety rules that may apply to your work situation and your work site.
Operate Only If Qualified

Section 9000 page 6
Inspect Machine
Wear Protective Clothing
Avoid Unauthorized Machine Modifications
Protective Clothing
Wear close fitting clothing and safety equipment appropriate to the job.
Prolonged exposure to loud noise can cause impairment or loss of hearing.
Wear a suitable hearing protective device such as earmuffs or earplugs to protect against objectionable or uncomfortable loud
noises.
Operating equipment safely requires the full attention of the operator. Do not wear radio or music headphones while operating
machine.
John Deere recommends using only genuine John Deere replacement parts to ensure machine performance. Never substitute
genuine John Deere parts with alternate parts not intended for the application as these can create hazardous situations or
hazardous performance. Non-John Deere parts, or any damage or failures resulting from their use are not covered by any John
Deere warranty.
Modifications of this machine, or addition of unapproved products or attachments, may affect machine stability or reliability,
and may create a hazard for the operator or others near the machine. The installer of any modification which may affect the
electronic controls of this machine is responsible for establishing that the modification does not adversely affect the machine or
its performance.
Any modified machine should not exceed the ROPS certification mass. Each John Deere ROPS has a certification label with the
applicable machine model and maximum ROPS certification mass.
Always contact an authorized dealer before making machine modifications that change the intended use, weight or balance of
the machine, or that alter machine controls, performance or reliability.

Section 9000 page 7
Avoid High Pressure Oils
Inspect Machine
Inspect machine carefully each day by walking around it before starting.
Keep all guards and shields in good condition and properly installed. Fix damage and replace worn or broken parts
immediately. Pay special attention to hydraulic hoses and electrical wiring.
Stay Clear Of Moving Parts
Entanglements in moving parts can cause serious injury.
Stop engine before examining, adjusting or maintaining any part of machine with moving parts.
Keep guards and shields in place. Replace any guard or shield that has been removed for access as soon as service or repair is
complete.
Avoid High-Pressure Oils
Stay Clear of Moving Parts

Section 9000 page 8
High Pressure
Inspect hydraulic hoses periodically – at least once per year – for leakage, kinking, cuts, cracks, abrasion, blisters, corrosion,
exposed wire braid or any other signs of wear or damage.
Replace worn or damaged hose assemblies immediately with John Deere approved replacement parts.
Escaping fluid under pressure can penetrate the skin causing serious injury.
Avoid the hazard by relieving pressure before disconnecting hydraulic or other lines. Tighten all connections before applying
pressure.
Search for leaks with a piece of cardboard. Protect hands and body from high-pressure fluids.
If an accident occurs, see a doctor immediately. Any fluid injected into the skin must be surgically removed within a few hours
or gangrene may result. Doctors unfamiliar with this type of injury should reference a knowledgeable medical source. Such
information is available in English from Deere & Company Medical Department in Moline, Illinois, U.S.A., by calling
1-800-822-8262 or +1 309-748-5636.
Avoid High-Pressure Oils
This machine uses a high-pressure hydraulic system. Escaping oil under pressure can penetrate the skin causing serious injury.
Never search for leaks with your hands. Protect hands. Use a piece of cardboard to find location of escaping oil. Stop
engine and relieve pressure before disconnecting lines or working on hydraulic system.
If hydraulic oil penetrates your skin, see a doctor immediately. Injected oil must be removed surgically within
hours or gangrene may result. Contact a knowledgeable medical source or the Deere & Company Medical Department in
Moline, Illinois, U.S.A.
Work In Ventilated Area
Avoid High-Pressure Fluids

Section 9000 page 9
Handle Fuel Safely
Store Safely
Starting fluid is highly flammable.
Keep all sparks and flame away when using it. Keep starting fluid away from batteries and cables.
To prevent accidental discharge when storing the pressurized can, keep the cap on the container, and store in a cool, protected
location.
Do not incinerate or puncture a starting fluid container.
Engine exhaust fumes
Engine exhaust fumes can cause sickness or death. If it is necessary to run an engine in an enclosed area, remove the exhaust
fumes from the area with an exhaust pipe extension.
If you do not have an exhaust pipe extension, open the doors and get outside air into the area.
Prevent Fires
Handle Starting Fluid Safely

Section 9000 page 10
Clean Machine Regularly
In Case of Machine Fire
Turn the engine OFF.
Turn the battery disconnect switch OFF.
If possible, fight the fire using the portable fire extinguisher or other fire suppression equipment.
Ensure that the fire does not spread to the surrounding area.
Call for help!
Carry A Fire Extinguisher
Handle Fuel Safely: Store flammable fluids away from fire hazards. Never refuel machine while smoking or when near sparks
or flame.
Clean Machine Regularly: Keep trash, debris, grease and oil from accumulating in engine compartment, around fuel lines,
hydraulic lines, exhaust components, and electrical wiring. Never store oily rags or flammable materials inside a machine
compartment.
Maintain Hoses and Wiring: Replace hydraulic hoses immediately if they begin to leak, and clean up any oil spills. Examine
electrical wiring and connectors frequently for damage.
Keep A Fire Extinguisher Available: Always keep a multipurpose fire extinguisher on or near the machine. Know how to use
extinguisher properly.
In Case of Machine Fire
Prevent Battery Explosions

Battery Explosions
Keep sparks, lighted matches, and open ﬂame away from the top of battery. Battery gas can explode.
Never check battery charge by placing a metal object across the posts. Use a volt-meter or hydrometer.
Do not charge a frozen battery; it may explode. Warm battery to 16°C (60°F).
Material Safety Data Sheet
Direct exposure to hazardous chemicals can cause serious injury. Potentially hazardous chemicals used with John Deere
equipment include such items as lubricants, coolants, paints, and adhesives.
A Material Safety Data Sheet (MSDS) provides speciﬁc details on chemical products: physical and health hazards, safety
procedures, and emergency response techniques.
Check the MSDS before you start any job using a hazardous chemical. That way you will know exactly what the risks are and
how to do the job safely. Then follow procedures and recommended equipment.
(See your John Deere dealer for MSDS’s on chemical products used with John Deere equipment.)
Dispose of Waste Properly
Handle Chemical Products Safely

First Aid Kit
Be prepared if an emergency occurs or a fire starts.
Keep a first aid kit and fire extinguisher handy.
Keep emergency numbers for doctors, ambulance service, hospital, and fire department near your telephone.
Recycle Waste
Improperly disposing of waste can threaten the environment and ecology. Potentially harmful waste used with John Deere
equipment include such items as oil, fuel, coolant, brake fluid, filters, and batteries.
Use leakproof containers when draining fluids. Do not use food or beverage containers that may mislead someone into drinking
from them.
Do not pour waste onto the ground, down a drain, or into any water source.
Air conditioning refrigerants escaping into the air can damage the Earth’s atmosphere. Government regulations may require a
certified air conditioning service center to recover and recycle used air conditioning refrigerants.
Inquire on the proper way to recycle or dispose of waste from your local environmental or recycling center, or from your John
Deere dealer.
Prepare for Emergencies
Clean Debris from Machine

Use Handholds and Steps
Prevent falls by facing the machine when getting on and oﬀ. Maintain 3-point contact with steps and handrails. Never use
machine controls as handholds.
Use extra care when mud, snow, or moisture present slippery conditions. Keep steps clean and free of grease or oil. Never
jump when exiting machine. Never mount or dismount a moving machine.
Clean Debris From Machine
Keep engine compartment, radiator, batteries, hydraulic lines, exhaust components, fuel tank, and operator′s station clean and
free of debris.
Clean any oil spills or fuel spills on machine surfaces.
Temperature in engine compartment may go up immediately after engine is stopped. BE ON GUARD FOR FIRES DURING THIS
PERIOD.
Open access door(s) to cool the engine faster, and clean engine compartment.
The control functions are described as they are arranged when the machine leaves the factory. Some of these may be changed
to suit particular operating situations. Ensure that you are aware of all of the functions before operating any of the controls.
Control Pattern
Start Only From Operator′s Seat
Use Steps and Handholds Correctly

Use and Maintain Seat Belt
Use seat belt when operating machine.
Examine seat belt frequently. Be sure webbing is not cut, torn, or worn. Replace seat belt immediately if any part is damaged
or does not function properly.
The complete seat belt assembly should be replaced every three years, regardless of appearance.
On units equipped with shoulder belts, wear both the seat and shoulder belt and do not lean forward while operating.
Operate Only From Operator′s Seat
Avoid unexpected machine movement. Start engine only while sitting in operator′s seat. Ensure all controls and working tools
are in proper position for a parked machine.
Never attempt to start engine from the ground. Do not attempt to start engine by shorting across the starter solenoid
terminals.
Avoid contact with gas lines, buried cables and water lines. Call utility line location services to identify all
underground utilities before starting work.
Prepare work site properly. Avoid operating near structures or objects that could fall onto the machine. Clear away debris
that could move unexpectedly if run over.
Avoid hoist (boom) or attachment contact with overhead obstacles or overhead electrical lines. Never move
machine closer than 3 m (10 ft) plus twice the line insulator length to overhead wires.
Keep bystanders clear at all times. Keep bystanders away from raised hoist (boom), stick (arm), attachments, and
unsupported loads. Avoid swinging or raising hoist (boom), stick (arm), attachments, or loads over or near personnel. Use
barricades or a signal person to keep vehicles and pedestrians away. Use a signal person if moving machine in congested areas
or where visibility is restricted. Always keep signal person in view. Coordinate hand signals before starting machine.
Operate only on solid footing with strength suﬃcient to support machine. Be especially alert working near embankments or
excavations.
Avoid working under over-hanging embankments or stockpiles that could collapse under or on machine.
Reduce machine speed when operating with tool on or near ground when obstacles may be hidden (for example, during
Avoid Work Site Hazards
Use and Maintain Seat Belt

snow removal or clearing mud, dirt, and so on.) At high speeds hitting obstacles (rocks, uneven concrete, or manholes) can
cause a sudden stop. Always wear seat belt.

Prevent Unintended Machine Movement
Hydraulic Enable Switch
LEGEND:
1Hydraulic Enable Switch
Be careful not to accidentally actuate controls when co-workers are present.
Press hydraulic enable switch (1) to disable the hydraulic functions. The amber LED on the switch will turn oﬀ.
Lower all equipment to rest on the ground during work interruptions. Stop engine before allowing anyone to approach the
machine.
Follow these same precautions before standing up, leaving the operator′s seat, or exiting the machine.

Operate Machine Safely
Always operate the machine with the operator protective structure (OPS) in place (doors, screens, windows, etc.).
Always walk around the machine before starting and moving it. Keep bystanders clear of machine, especially before moving
hoist (boom), swinging upperstructure or traveling. Always be alert for bystanders in or near the work area.
Avoid contact between hoist (boom) and overhead obstacles when you operate, move, or haul machine.
When working on a slippery slope, position the tracks parallel to the angle of the slope. Then the track shoe grousers help
serve as a brake.

Make sure work site footing is strong enough to ﬁrmly support the machine. When working next to a ledge, position the
machine with the tracks perpendicular to the ledge and with the travel motors (M) at the rear, away from the ledge.
If engine stops during operation on a hillside, start engine immediately. Press hydraulic enable switch OFF then ON, and
resume normal operation.

Avoid Machine Tip Over
Avoid Machine Tip Over
Use seatbelt at all times.
When operating on a slope, keep front-mounted equipment low to ground and close to machine. Point tracks uphill.
Avoid tipping the machine when swinging heavy loads. Reduce swing speed as necessary.
Be cautious of tipping when working on frozen ground. Temperature increases will cause ground to become soft and make
ground travel unstable.

Keep Riders Off Machine
Use Care When Swinging Machine
Swing Caution
Ensure that all bystanders are clear before swinging the machine.
Keep Riders Off Machine
Only allow the operator on the machine. Keep riders off.
Riders on machine are subject to injury such as being struck by foreign objects and being thrown off of the machine. Riders
also obstruct the operator′s view resulting in the machine being operated in an unsafe manner.
Never use the harvesting head or attachment for a work platform or personnel carrier.
Never move loads over the heads of other persons.

Be sure that there is suﬃcient clearance for the hoist (boom), stick (arm), and load.
Be aware of the position of the counter weight.
Backover Warning
Before moving machine, be sure all persons are clear of both travel and swing paths. Turn around and look directly
for best visibility. Use mirrors to assist in checking all around machine. Keep windows and mirrors clean, adjusted, and in good
repair.
Be certain travel alarm is working properly.
Use a signal person when backing if view is obstructed or when in close quarters. Keep signal person in view at all
times. Use prearranged hand signals to communicate.
Operate Booms with Care
Always lower the hoist (boom) and stick (arm) so that the harvesting head is securely supported when operation is stopped.
When moving the machine, watch that enough clearance is available on both sides and above the hoist (boom). Extra
clearance may be required particularly where the ground is uneven.
Maintain a safe operating distance between the equipment and other personnel. Never swing upperstructure with hoist (boom),
stick (arm), harvesting head, or load elevated above the heads of bystanders.
Use only prearranged and approved signaling practices.
Avoid Backover Accidents
Operate Hoist (Boom) With Care

Travel Safely
Avoid Power Lines
Operating On Slopes
Add and Operate Attachments Safely
Avoid side slope travel whenever possible. When working on steep slopes, travel as straight up and down as possible to
prevent machine tip over.
Select low gear speed before starting down slope. The slope on which you can operate safely will be limited by ground
condition and the load being handled.
Be alert to wind direction and velocity.
Travel Safely
Know the location of bystanders before moving the machine.
Always keep the machine moving warning alarm, if equipped, in working condition. It warns people when the machine starts to
move.
Use a signal person when moving the machine in congested areas. Coordinate hand signals before starting the machine.
→NOTE:
When working on steep slopes, travel as straight up and down as possible to prevent roll-over.
Do not park on a hilllside or an incline.
Always park machine on a firm, level surface.
Always verify compatibility of attachments by contacting your authorized dealer. Adding unapproved attachments may affect
machine stability or reliability, and may create a hazard for others near the machine.
Ensure that a qualified person is involved in attachment installation. Add guards to machine if operator protection is required or
recommended. Verify that all connections are secure and attachment responds properly to controls.
Carefully read attachment manual and follow all instructions and warnings. In an area free of bystanders and obstructions,
carefully operate attachment to learn its characteristics and range of motion.

If state/province, local, or job site regulations require even greater safety distances than stated above, adhere strictly to these
regulations for your own protection.
A damaged roll-over protective structure (ROPS) should be replaced, not reused.
The protection oﬀered by ROPS will be impaired if ROPS is subjected to structural damage, is involved in an overturn incident,
or is in any way altered by welding, bending, drilling, or cutting.
Operating or Traveling On Public Roads
Machines that work near vehicle traﬃc or travel slower than normal highway speeds must have proper lighting and markings to
assure they are visible to other drivers.
Install additional lights, beacons, slow moving vehicle (SMV) emblems, or other devices and use as required to make the
machine visible and identify it as a work machine. Check state and local regulations to assure compliance. Keep these devices
clean and in working condition.
Avoid Power Lines
Approach with caution areas where overhanging telephone or electric power lines are present. Serious injury or death by
electrocution can result if the machine or any of its attachments are not kept a safe distance from high-voltage electric power
lines.
Maintain a distance of 10 ft. (3 m) between the machine or hoist (boom) and any power line carrying up to 50 000 volts or less.
CAUTION:
Power lines carrying more than 50,000 volts require a safety distance of 10 ft. (3 m) plus 1/2 in. (13 mm)
for each additional 1000 volts above the 50,000 volt level.
Inspect and Maintain ROPS
Operating or Traveling On Public Roads

Do Not Operate Tag
If ROPS was loosened or removed for any reason, inspect it carefully before operating the machine again.
To maintain the ROPS:
Replace missing hardware using correct grade hardware.
Check hardware torque.
Check isolation mounts for damage, looseness or wear; replace them if necessary.
Check ROPS for cracks or physical damage.
Support Machine Properly
Warn others of service work. Always park and prepare your machine for service or repair properly.
Park carrier on a level surface and lower equipment to the ground.
Disable the hydraulics. Press the hydraulic enable switch OFF.
Press ignition OFF/engine STOP switch to stop engine.
Attach a “Do Not Operate” tag in an obvious place in the operator′s station.
Always lower the harvester head to the ground before you work on the harvester. If you must work on a harvester head,
securely support the harvester.
Do not support the harvester on cinder blocks, hollow tiles, or props that may crumble under continuous load. Do not work
under a harvester that is supported solely by a jack. Follow recommended procedures in this manual.
Understand service procedures before beginning repairs. Keep service area clean and dry. Use two people whenever the
engine must be running for service work.
Service Machines Safely
Park and Prepare for Service Safely

Hydraulic Accumulator
Service Machines Safely
Tie long hair behind your head. Do not wear a necktie, scarf, loose clothing, or necklace when you work near machine tools or
moving parts. If these items were to get caught, severe injury could result.
Remove rings and other jewelry to prevent electrical shorts and entanglement in moving parts.
Cooling System
Explosive release of fluids from pressurized cooling system can cause serious burns.
Do not service radiator through the radiator cap. Only fill through the surge tank filler cap. Shut off engine. Only remove surge
tank filler cap when cool enough to touch with bare hands. Slowly loosen cap to relieve pressure before removing completely.
Service Cooling System Safely
Service Accumulator Systems Safely

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John Deere 903KH, 909KH Harvester Service Manual TM11623

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