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John Deere 6076 Natural GAS Engines workshop manual pdf

John Deere  6076 Natural Gas Engines Serial Number (500000— ) Deere Power Systems Group CTM82 (11JUN93) workshop manual

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.Use this component technical manual in conjunction with the machine technical manual. An application listing in the introduction identifies product-model/component type-model relationship. See the machine technical manual for information on component removal and installation, and gaining access to the components. This manual is divided in two parts: repair and operation and tests. Repair sections contain necessary instructions to repair the component. 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. Component Technical Manuals are concise service guides for specific components. Component technical manuals are written as stand-alone manuals covering multiple machine applications. 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.

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John Deere serise 4050-4250-4450-4650-4850 workshop repair manual pdf

DownloadJohn Deere serise 4050-4250-4450-4650-4850 Repair Manual & operation and maintenance,Instant download of the factory repair manual for John Deere serise 4050-4250-4450-4650-4850., but it can also be used for 1983-1984 models. Covers complete tear down and rebuild, pictures and part diagrams, torque specs, maintenance, troubleshooting, etc.you can download it, This is a must for the Do-It-Yourselfer!

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Each tractor has the following serial number plates:basic tractor,engine short block,mechanical front-wheel drive,transmission,hydraulic pump,roll-gard and sound-gard bldy.
the basic tractor serial number plate is located at the rear of the transmission case.the engine serial number plate is located on right side of engine behind he injection pump, the mechanical front-wheel drive serial number plate is located on the axle housing,the transmission serial number plate is lcated on left side of transmission case,the hydraulic pump serial number plate is located onthe right side of pump housing ,the roll-gard serial number plate if located on right-hand front post,the sound-gard body serial number plate is located on the windshield wiper motor access door header.

Manual Covers: 

  • engine
  • final drive
  • front system
  • front-wheel drive
  • hydraulic system
  • power steering system
  • power take-off
  • transmission
  • brakes
  • clutch
  • cooling system
  • diesel system
  • differential
  • differential lock
  • electrical system

and more

User tags: John Deere serise 4050,John Deere 4250,John Deere 4450,John Deere 4650,John Deere 4850 ,John Deere workshop repair manual

bobcat 753 G series HYDROSTATIC SYSTEM INFORMATION Troubleshooting Chart

The following troubleshooting chart is provided for assistance in locating and correcting problems which are most common. Many of the recommended procedures must be done by authorized Bobcat Service Personnel only.

PROBLEM CAUSE
No drive on one side, in one direction. 1, 2
No drive on one side in both directions. 2, 3, 4, 5
The loader does not move in a straight line 2, 3, 5, 6, 7
The hydrostatic system is overheating. 8, 9, 10, 11
Service code HP2 appears. (Warnings, low charge pressure.) 8, 11, 12, 13

KEY TO CORRECT THE CAUSE
1. The hydrostatic pump replenishing valves not seating.
2. The steering linkage needs adjustment.
3. The hydrostatic pump has damage.
4. The final drive chains are broken.
5. The hydrostatic motor has damage.
6. The tires do not have the correct tire pressure.
7. The tires are not the same size.
8. The hydrostatic fluid is not at the correct level.
9. The oil cooler has a restriction.
10. The temperature sending switch is not operating correctly.
11. The loader is not being operated at the correct RPM.
12. The hydraulic charge pressure sender is defective.
13. Pump is defective or worn hydrostatics.

komatsu wa115-3 wheel loader repair TROUBLESHOOTING GUIDE

Checks prior to trouble shooting:

  • Check belt tension
  • Check condenser
  • Check condenser blower, rotation direction right
  • Compressor switches on and off
  • Compressor clutch OK
  • Function of air vents OK
  • Coolant level OK (inspection glass)
  • Condensation drain away
  • Air temperature OK

Fault 1. Low pressure too or  high High pressure too high

Cause
Remedy
  • System too full
  • Condenser is dirty or blocked
  • Blower faulty or wrong rotational direc
  • Check filling level
  • Clean condenser or replace
  • Repair blower or replace

Fault 2.  Low pressure too or  high High pressure too high

Cause
Remedy
  • Dryer blockes
  • Faulty expansion valve
  • Compressor faulty
  • Replace dryer
  • Replace expansion valve
  • Replace compressor

Fault 3.  Low and high pressure the same

Cause
Remedy
  • Compressor faulty
  • Check drive belt – belt pulley – magnetic clutch, if all correct, proceed as for “Compressor does not switch on”

Fault 4. Low pressure too low or High pressure normal

Cause
Remedy
  • Faulty expansion valve
  • Dirty or blockes vaporizer
  • Replace expansion valve
  • Clean or replace vaporizer

Fault 5. Low pressure too low or High pressure too low

Cause
Remedy
  • Expansion valve faulty
  • Not enough coolant
  • Insufficient cooling effect only for short time; water in system, expansion valve iced up as a result
  • Dryer or expansion valve partially blocked
  • Vaporizer iced up
  • Thermoswitch not working
  • Replace expansion valve
  • Refill air conditioning system
  • Evacuate system, replace dryer
  • Replace dryer or expansion valve
  • Check the ON and OFF times of the compressor
  • Adjust or replace the thermoswitch

Fault 6. Compressor switches on and off at speed

Cause
Remedy
  • Loose contact in the electric system
  • Coolant pressure too high
  • Check electrical system (air conditioner switch, thermostat)
  • Check air conditioning system pressure and refill if necessary

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Polaris Ranger 500 4×4 Engine TROUBLESHOOTING GUIDE

Engine Turns Over But Fails to Start
• No fuel
• Dirt in fuel line or filter
• Fuel will not pass through fuel valve
• Fuel pump inoperative/restricted
• Tank vent plugged
• Engine flooded
• Low compression (high cylinder leakage)
• No spark (Spark plug fouled)
Engine Does Not Turn Over
• Dead battery
• Starter motor does not turn
• Engine seized, rusted, or mechanical failure
Engine Runs But Will Not Idle
• Low compression
• Crankcase breather restricted
Engine Idles But Will Not Rev Up
• Spark plug fouled/weak spark
• Broken throttle cable
• Obstruction in air intake
• Air box removed (reinstall all intake components)
• Reverse speed limiter limiting speed
• Incorrect ignition timing
• Restricted exhaust system
Engine Has Low Power
• Spark plug fouled
• Cylinder, piston, ring, or valve wear or damage (check compression)
• PVT not operating properly
• Restricted exhaust muffler
Piston Failure – Scoring
• Lack of lubrication
• Dirt entering engine through cracks in air filter or ducts
• Engine oil dirty or contaminated
Excessive Smoke and Carbon Buildup
• Excessive piston-to-cylinder clearance
• Wet sumping
• Worn rings, piston, or cylinder
• Worn valves, guides or seals
• Restricted breather
• Air filter dirty or contaminated
Low Compression
• Decompressor stuck
• Cylinder head gasket leak
• No valve clearance or incorrectly adjusted
• Cylinder or piston worn
• Piston rings worn, leaking, broken, or sticking
• Bent valve or stuck valve
• Valve spring broken or weak
• Valve not seating properly (bent or carbon accumulated on sealing surface)
• Rocker arm sticking

Backfiring
• Fouled spark plug or incorrect plug or plug gap
• Exhaust system air leaks
• Ignition system faulty:
Spark plug cap cracked/broken
Ignition coil faulty
Ignition or kill switch circuit faulty
Ignition timing incorrect
Sheared flywheel key
• Poor connections in ignition system
• System wiring wet
• Valve sticking
• Air leaks in intake
• Lean condition
Spark Plug Fouling
• Spark plug cap loose or faulty
• Incorrect spark plug heat range or gap
• PVT system calibrated incorrectly or components worn or mis-adjusted
• Fuel quality poor (old) or octane too high
• Low compression
• Restricted exhaust
• Restricted air filter (main or pre-cleaner)
• Improperly assembled air intake system
• Restricted engine breather system
• Oil contaminated with fuel
• Restricted oil tank vent
Cooling Troubleshooting
Overheating
• Low coolant level
• Air in cooling system
• Wrong type of coolant
• Faulty pressure cap or system leaks
• Restricted system (mud or debris in radiator fins or restriction to air flow, passages blocked in radiator, lines, pump, or water jacket)
• Lean mixture (restricted jets, vents, or fuel pump)
• Fuel pump output weak
• Restricted radiator (internally or cooling fins)
• Water pump failure
• Cooling system restriction
• Cooling fan inoperative or turning too slowly
• Ignition timing misadjusted
• Low oil level
• Spark plug incorrect heat range
• Faulty hot light circuit
• Thermostat stuck closed or not opening completely
• Radiator is missing its internal diverter plate not  allowing coolant to flow through entire radiator Temperature Too Low
• Thermostat stuck open
Leak at Water Pump Weep Hole
• Faulty water pump mechanical seal (coolant leak)
• Faulty pump shaft oil seal (oil leak)

Polaris Sportsman 800 Engine TROUBLESHOOTING GUIDE

Spark Plug Fouling
• Spark plug cap loose or faulty
• Incorrect spark plug heat range or gap
• PVT system calibrated incorrectly/ components worn or mis-adjusted
• Fuel quality poor (old) or octane too high
• Low compression
• Restricted exhaust
• Weak ignition (loose coil ground, faulty coil, stator, or  ETC switch)
• ETC switch mis-adjusted
• Restricted air filter (main or pre-cleaner) or breather  system
• Improperly assembled air intake system
• Restricted engine breather system
• Oil contaminated with fuel
Engine Turns Over But Fails To Start
•No fuel
• Dirt in fuel line or filter
• Fuel will not pass through fuel valve
• Fuel pump inoperative/restricted
• Tank vent plugged or pinched
• Engine flooded
• Low compression (high cylinder leakage)
• No spark (Spark plug fouled) ignition component  failure
Engine Does Not Turn Over
• Dead battery
• Starter motor does not turn
• Engine seized, rusted, or mechanical failure
Engine Runs But Will Not Idle
• Restricted carburetor pilot system
• Low compression
• Crankcase breather restricted
Engine Idles But Will Not Accelerate
• Spark plug fouled/weak spark
• Broken throttle cable
• Obstruction in air intake
• Air box removed (reinstall all intake components)
• Incorrect or restricted carburetor jetting
• ETC switch limiting speed
• Reverse speed limiter limiting speed
• Incorrect ignition timing
• Restricted exhaust system
• Cam worn excessively
Engine Has Low Power
• Spark plug fouled
• Cylinder, piston, ring, or valve wear or damage (check  compression)
• PVT not operating properly
• Restricted exhaust muffler
• Cam worn excessively
Piston Failure – Scoring
• Lack of lubrication
• Dirt entering engine through cracks in air filter or ducts
• Engine oil dirty or contaminated
Excessive Smoke and Carbon Buildup
• Excessive piston-to-cylinder clearance
• Wet sumping (Oil Level Too Full)
• Worn rings, piston, or cylinder
• Worn valve guides or seals
• Restricted breather
• Air filter dirty or contaminated
Piston Failure – Scoring
• Lack of lubrication
• Dirt entering engine through cracks in air filter or ducts
• Engine oil dirty or contaminated

Excessive Smoke and Carbon Buildup
• Excessive piston-to-cylinder clearance
• Wet sumping due to over-full crankcase
• Worn rings, piston, or cylinder
• Worn valve guides or seals
• Restricted breather
• Air filter dirty or contaminated
Low Compression
• Cylinder head gasket leak
• No valve clearance ( cam wear )
• Cylinder or piston worn
• Piston rings worn, leaking, broken, or sticking
• Bent valve or stuck valve
• Valve spring broken or weak
• Valve not seating properly (bent or carbon accumulated  on sealing surface)
• Rocker arm sticking
Backfiring
• ETC or speed limiter system malfunction
• Fouled spark plug or incorrect plug or plug gap
• Exhaust system air leaks
• Exhaust system air leaks
• Ignition system faulty: Spark plug cap cracked/broken, Ignition coil faulty, Ignition or kill switch circuit faulty,  Ignition poor connections in ignition system
• n timing incorrect, Sheared flywheel key
• Valve sticking

Cooling System
Overheating
• Low coolant level
• Air in cooling system
• Wrong type/mix of coolant
• Faulty pressure cap or system leaks
• Restricted system (mud or debris in radiator fins causing restriction to air flow, passages blocked in radiator, lines, pump, or water jacket, accident damage)

• Lean mixture (restricted jets, vents, fuel pump or fuel valve)
• Fuel pump output weak
• Electrical malfunction
• Water pump failure/ Loose impeller
• Thermistor failure
• Cooling fan inoperative or turning too slowly (perform current draw test)
• Ignition timing mis-adjusted
• Low oil level
• Spark plug incorrect heat range
• Faulty hot light circuit
• Thermostat stuck closed or not opening completely
• Possible diverter plate loose or missing inside radiator
Temperature Too Low
• Thermostat stuck open
Leak at Water Pump Weep Hole
• Faulty water pump mechanical seal (coolant leak)
• Faulty pump shaft oil seal (oil leak)

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