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Kubota M4500 Troubleshooting
The
Kubota M4500 is a 2-wheel drive or 4-wheel drive utility tractor. This model was
manufactured between 1978 and 1985. The tractor was designed in 2 versions:
M4500DT (4WD) and M4500-OC (Orchard).
The Kubota M4500 is equipped with a 158.6 cubic inches (2.6L) Kubota
S2600 4-stroke 6-cylinder liquid-cooled diesel engine. The engine has a
cylinder bore of 3.23" (82 mm), piston stroke of 3.23" (82 mm), and
maximum power of 55.5 hp (41.4 kW). The transmission consists of a dry
clutch and partially synchronized gearbox with 16 forward and 4 reverse
gears.
The maximum forward speed - 15.8 mph (25.4 km/h), max. reverse speed -
7.4 mph (11.9 km/h). The open center hydraulic system used a gear pump
with rated capacity of 7.3 gpm (27.6 lpm). The hydraulic pressure is
171.5 bar (2485 psi). The Kubota M4500 was equipped with a power assist
steering system, differential mechanical wet disc brakes, 6.00-16 (2WD)
or 8.30-20 (4WD) front tires, and 14.9-28 rear tires. The wheelbase is
78.2 in (1980 mm).
| Engine Troubleshooting |
| Diesel won't start or hard to start |
| Clogged fuel filter element - Change the filter element |
| Closed fuel cock - Open fuel on-off cock to inject fuel |
| Air in fuel lines - Bleed fuel lines |
| Fuel injectors are damaged or dirty - Test fuel injectors and change if necessary |
| Fuel injection pump is not working correctly - Rebuild or install a new injection pump |
| Low compression - Inspect cylinder block and replace worn components |
| Engine stops unexpectedly while running |
| Coolant temperature is low - Warm up the engine to required temperature |
| Air trapped in fuel system - Bleed air |
| Fuel injection failed - Use correct settings |
| Dirty fuel filter element - Change the filter element |
| Faulty or dirty injectors - Check fuel injectors and replace if required |
| Diesel starts and stalls suddenly |
| Timing of fuel injection pump is not adjusted - Repair or replace fuel injection pump |
| Dirty fuel filter element - Change filter element |
| Fuel injector nozzles are clogged or faulty - Service or replace injector nozzles |
| Fuel injection pump is broken - Repair or install new pump |
| Air cleaner clogging - Service or change air cleaner |
| Engine stalls when idling |
| Improperly adjusted low idle speed - Adjust the low idle speed |
| Fuel injection pump malfunctioning - Replace injection pump or repair it |
| Clogged or defective injector nozzles - Check and change nozzles as required |
| The valve clearance is incorrect - Correct valve clearance needs to be set |
| Insufficient coolant fluid - The cooling system needs to be refilled. If there are leaks in the system, replace worn components |
| Cooling system components are worn or system is clogged - Flush cooling system or change faulty components |
| Engine oil level is low - Need to add engine oil |
| Fan belt tension is unadjusted or belt is worn - Adjust as required or replace belt |
| Defective thermostat - Thermostat needs to be replaced |
| Diesel engine loses power |
| Fuel injectors are damaged or dirty - Check fuel injectors and replace if required |
| Insufficient fuel injection pressure - Correct the pressure settings |
| Air filter element clogging - Replace or service air filter element |
| Dirty oil filter element - Replace or service engine oil filter |
| Diesel engine is overloaded - Load reducing is recommended |
| Valve out of adjustment - Correct valve clearance needs to be set |
| Incorrectly set low idle speed - Normalize low idle speed |
| Fuel pipes or hoses clogging - Clean fuel hoses and pipes |
| Low engine compression: Valves are defective or worn - Valves need to be replaced |
| Engine knocking sound or abnormal noise |
| Unadjusted fuel injection pump timing - Correct injection timing |
| Fuel injector nozzles are dirty or defective - Test injector nozzles and replace as required |
| Not enough engine oil - Check oil level and add oil as required |
| Engine is not preheated - Warm up the engine as required |
| Main bearings or crankshaft wear - Crankshaft or bearings need to be replaced |
| Piston rings are damaged or broken - Replace piston rings |
| Loose flywheel screws - Check the flywheel screws and tighten as required |
| Engine using too much oil |
| Oil leaking: Seals or gaskets are defective - Install new components |
| Oil viscosity is incorrect - Use oil of correct viscosity |
| Piston rings are stuck or broken - Piston rings need to be replaced |
| Worn valve stems and valve guides - Change the valves |
| Scored pistons or cylinder liners - Check liners and pistons, change as required |
| Electrical System Troubleshooting |
| Battery does not charge |
| Battery failing - Use a new battery |
| Battery cable harness damage - Check battery cables for damage, change or repair |
| Battery terminals and cables are corroded or loose - Service or tighten battery cables and terminals |
| Damaged belt or incorrectly adjusted belt tension - Adjust belt tension properly or replace belt |
| Low battery power - Low battery charging, charge as required |
| Battery is draining quickly - Battery needs service or replacement |
| Bad battery cable harness - Inspect cables for malfunctions, repair or change |
| Battery terminals and cables are corroded or loose - Tighten or clean cables and terminals |
| Battery power is low - Charge the battery |
| Discharged or defective battery - Change or recharge battery |
| Starter motor is faulty - Starter needs to be changed |
| Battery cables are disconnected or incorrectly connected - Check cables and reconnect it correctly |
| Transmission Troubleshooting |
| Gear shift is hard |
| Failure or improper clutch adjustment - Replace or adjust clutch |
| Gear shift linkage is damaged or loose - Service or replace shift linkage |
| Worn or damaged shift forks - Shift forks need to be replaced |
| Gear shifting mechanism is worn - Change worn components |
| Low transmission pressure |
| Oil level is low - Fill the transmission housing to proper oil level |
| Transmission fluid filter is dirty (if equipped) - Change or clean the transmission fluid filter |
| Relief valve is defective - Install a new valve |
| Transmission is making noise |
| Cracked or worn bearings - Change faulty bearings |
| Insufficient fluid supply - Check transmission fluid level and add it as required |
| Transmission fluid contamination - Transmission fluid must be changed |
| Defective gears or incorrect backlash - Replace gears or set backlash correctly |
| Worn or damaged shift forks - Replace the shift forks |
| Transmission fluid leaking |
| Broken gaskets or seals - Seals and gaskets need to be replaced |
| Cracked transmission case - Install a new transmission case |
| Hydraulics Troubleshooting |
| Hydraulic system overheats |
| Hydraulic system pressure is not set correctly - Set the hydraulic pressure as required |
| Main relief valve is defective or unadjusted - Adjust relief valve or change if required |
| Hydraulic oil contamination - Change the oil |
| Air trapped in the hydraulic system - Inspect the suction pipe, fittings, and pump seals |
| Hydraulic fluid pressure is low |
| Hydraulic oil level is insufficient - Fill up the hydraulic oil |
| Hydraulic fluid filter is clogged - Clean or replace the hydraulic filter |
| Hydraulic pump is defective - Test the pump flow rate and install new pump if required |
| Hydraulic spool valve block is defective or set improper - Replace or adjust correctly |
| Hydraulic cylinder failure - Inspect cylinder components for wear or damage and change if required |
| Hydraulic pipes are leaking - Inspect hydraulic system for leaks and repair it |
| 3-point hitch lifts slowly or won't lift |
| Lack of hydraulic oil - Fill up the hydraulic oil |
| Cold fluid in hydraulic system - Wait for fluid to warm up |
| Hydraulic oil filter is dirty - Clean or replace the hydraulic filter |
| Hydraulic pump not working - Test the pump flow rate and install new pump if required |
| Unadjusted or defective main relief valve - Replace or set up the relief valve |
| Hydraulic control valve block is defective or set improper - Adjust properly or replace |
| Faulty hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary |
| Suction line is damaged or disconnected - Connect or replace |
| Hitch not dropping or hitch drops slowly |
| Defective or not adjusted hydraulic control valve - Set properly or replace |
| Faulty hydraulic cylinder - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Lift arm shaft is worn - Replace the shaft |
| Mechanical components of the hitch are defective - Replace damaged or worn hitch components |
| Hitch jerks when lift or lower |
| Hydraulic system sucks air - Check the pump seals, suction pipe, and fittings |
| Contaminated hydraulic oil - Change hydraulic oil |
| Faulty hydraulic oil pump - Test pump flow rate and replace pump if required |
| Defective or not adjusted hydraulic control valve - Change or adjust properly |
| Hydraulic cylinder malfunction - Check cylinder parts for wear or damage and replace if necessary |
| Steering System Troubleshooting |
| Steering is stiff |
| Steering column is broken or improperly installed - Steering column must be installed properly or replaced |
| Air in steering system - Bleed the system of air |
| Not adjusted toe-in - Check and adjust toe-in |
| Tires are incorrectly inflated - Inflate as required |
| Faulty steering pump - Steering pump needs to be replaced or repaired |
| Defective or worn power steering valve - Change or repair steering valve if required |
| Steering cylinder is damaged - Replace or repair hydraulic steering cylinder |
| Steering fluid level is insufficient - Add oil to steering system |
| Oil leaks in the steering system - Tighten the steering line and hose joints |
| Excessive play in steering |
| Steering column coupling or shaft is extremely worn out - Change defective part |
| Power steering valve is defective or worn - Check and replace as required |
| Steering pump failure - Steering pump needs to be repaired or replaced |
| Steering linkage or tie-rod ends are worn - Change damaged component |
| Tractor pulls to left or right |
| Tire pressure is improper - Inflate the tires properly |
| Toe-in adjustment is incorrect - Adjust toe-in correctly |
| Steering linkage or tie-rod ends are defective - Replace damaged component |
| Worn or damaged power steering valve - Change or repair steering valve if required |
| Steering cylinder is damaged - Replace or repair hydraulic steering cylinder |
| Defective or improperly adjusted front hub bearings - Replace the bearings or adjust it properly |
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| Farm Tractors Technical Specifications |
