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Kubota M4030 Troubleshooting
The
Kubota M4030 utility tractor from M30 Series was manufactured from 1986 to 1989.
The Kubota M4030 powertrain system components: a 158.5 cu.in (2.6 L) Kubota
S2602-DI four-stroke six-cylinder liquid-cooled diesel engine and selective gear
transmission with 8 forward and 2 reverse gears. The engine has a cylinder bore
of 3.23" (82 mm), piston stroke of 3.23" (82 mm), and rated power of 48 hp (35.8
kW). The maximum travel speed (forward/reverse): 16.3 mph (26.2 kph) and 7 mph
(11.3 kph). The open center hydraulic system has a gear pump with a rated
capacity of 11 gal/min (41.6 l/min).
The hydraulic pressure is 181.5 bar (2630 psi). The 2-wheel drive models
are equipped with 6.0x16 front tires and 13.6x28 rear tires. The 9.5x20
front tires and 13.6x28 rear tires are used for 4-wheel drive tractors.
The Kubota M4030 tractor can be equipped with the following attachments:
Kubota M1870A loader
with a lift capacity to full height of 2190 lbs (993 kg) and breakout
force of 3670 (1664 kg).
| Engine Troubleshooting |
| Engine won't start or starts hard |
| Fuel filter is dirty - Service the filter |
| The fuel shut-off valve is closed - Open fuel shut-off valve |
| Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system |
| Faulty or dirty injectors - Test fuel injectors and change if necessary |
| Faulty fuel injection pump - Replace injection pump or repair it |
| Low cylinder compression - Check and replace worn parts |
| Engine stops during operation |
| Coolant temperature is low - Warm up engine as required |
| Air in fuel pipes - Bleed fuel pipes |
| Improper fuel injection - Fuel injection settings required |
| Fuel filter is dirty - Service or replace the filter |
| Dirty or faulty injectors - Clean or replace fuel injectors |
| Diesel starts but then stalls |
| Fuel injection pump timing is incorrect - Adjust injection timing |
| Fuel filter clogging - Replace the filter element |
| Fuel injector nozzles are faulty - Change or clean injector nozzles |
| Fuel injection pump is not operating properly - Repair or change injection pump |
| Air cleaner is clogged - Change or replace air cleaner element |
| Incorrect low idle speed adjustment - Normalize low idle speed |
| Fuel injection pump is not operating properly - Replace or repair injection pump |
| Clogged or damaged injector nozzles - Change injector nozzles |
| The valve clearance is not adjusted - Check and adjust as required |
| Insufficient coolant fluid - Refill to the correct level. If there are leaks in the system, replace worn components |
| Cooling system is clogged or cooling parts are worn - Change faulty components or service cooling system |
| Insufficient engine oil - Check oil level and add oil as required |
| Fan belt is worn or belt tension is improper - Adjust belt tension correctly or change it |
| Thermostat is defective - Check and replace if required |
| Faulty or dirty injectors - Check fuel injectors and replace if required |
| Fuel injection pressure is wrong - Correct the pressure settings |
| Clogged air filter - Air filter maintenance required |
| Oil filter element clogging - Service or change engine oil filter element |
| Diesel engine is overloaded - Change to lower gear or reduce load |
| The valve clearance is incorrect - Check and adjust as required |
| Improperly adjusted low idle speed - Test and adjust |
| Restricted fuel pipes or hoses - Clean fuel system hoses and pipes |
| Poor engine compression: Valves are defective or worn - Replace the valves |
| Engine knocking sound or abnormal noise |
| Incorrectly set fuel injection pump timing - Adjust the fuel injection pump timing correctly |
| Fuel injector nozzles are damaged or dirty - Install new set of properly balanced nozzles |
| Engine oil level is low - Checking oil level and add if necessary |
| Engine is not fully warmed up - Warm up the engine |
| Worn main bearings or crankshaft - Have bearings or crankshaft replaced |
| Stuck or worn piston rings - Have piston rings replaced |
| The flywheel to crankshaft bolts are loose - Tighten bolts as required |
| Engine consuming too much oil |
| Oil leaks: Gaskets or seals may be damaged - Change to repair leaks |
| Oil viscosity is incorrect - Fill up with the proper oil viscosity |
| Worn or stuck piston rings - Install new piston rings |
| Damaged valve stems or valve guides - Valves replacement required |
| Pistons or cylinder liners are damaged - Check liners and pistons, install new components as required |
| Electrical System Troubleshooting |
| Battery cannot be charged |
| Battery faulty cell - Install a new battery |
| Battery electrical wire harness failure - Inspect wires for defects, change or repair |
| Battery terminals and cables are loose or corroded - Clean or tighten cables and terminals |
| Belt slipping or wrong belt tension adjustment - Change belt or adjust belt tension properly |
| Battery capacity is low - Battery is drained, charge it |
| Battery runs out quickly - Battery needs to be serviced or replaced |
| Battery electrical wire harness damage - Check battery wires for damage, replace or change |
| Corroded or loose battery cables and terminals - Tighten or clean cables and terminals |
| Low battery power - Low battery charging, charge as required |
| Drained or defective battery - Change or recharge battery |
| Damaged starter motor - Starter should be replaced |
| Disconnected or incorrectly connected cables - Need to reconnect cables correctly |
| Transmission Troubleshooting |
| Difficult to shift gears |
| Misadjusted or defective clutch - Adjust or change the clutch |
| Gear shift linkage is damaged or loose - Repair or change shift linkage |
| Damaged or worn shift forks - Change the shift forks |
| Gearshift mechanism failure - Change or repair failed components |
| Low transmission fluid pressure |
| Insufficient fluid supply - Fill system with correct transmission fluid level |
| Plugged transmission fluid filter (if equipped) - Replace or clean transmission fluid filter |
| Faulty relief valve - Install a new relief valve |
| Bearings are worn or broken - Install new bearings |
| Not enough fluid in transmission - Fill the transmission housing with fluid |
| Transmission oil contamination - Fill up with fresh transmission oil |
| Gears are defective or backlash is incorrect - Change worn gears or set backlash correctly |
| Worn or damaged shift forks - Replace defective shift forks |
| Gaskets or seals are damaged - Install new components |
| Cracked transmission case - Install a new transmission case |
| Hydraulics Troubleshooting |
| Hydraulic system overheated |
| Hydraulic system pressure is unadjusted - Adjust the pressure as required |
| Main relief valve failure or incorrect setting - Adjust the valve or replace if necessary |
| Contaminated hydraulic fluid - Change hydraulic fluid |
| Air trapped in the hydraulic system - Check the suction pipe, fittings, and pump seals |
| Hydraulic fluid pressure is low |
| Hydraulic fluid level is low - Need to add fluid |
| Hydraulic fluid filter clogging - Clean or change hydraulic filter |
| Hydraulic pump failure - Test the pump performance and change pump if required |
| Faulty or incorrect setting hydraulic spool valve - Replace or adjust properly |
| Hydraulic cylinder is broken - Check cylinder parts for wear or damage and replace if necessary |
| Leakage in hydraulic pipes - Inspect hydraulic system for leaks and repair it |
| Hitch cannot be lifted or lifting is too slow |
| Hydraulic oil level is low - Fill the hydraulic system with oil |
| Hydraulic oil is too cold - Allow oil to warm |
| Hydraulic fluid filter clogging - Clean the hydraulic filter or install new filter element |
| Hydraulic pump malfunction - Test the pump performance and change pump if required |
| Main relief valve is defective or unadjusted - Adjust or replace the relief valve |
| Faulty or incorrect setting hydraulic spool valve - Replace or adjust correctly |
| Faulty hydraulic cylinder - Inspect the hydraulic cylinder components for damage or wear and change if required |
| Damaged or disconnected suction pipe - Connect or replace |
| Three-point hitch dropping is too slow or cannot be dropped |
| Hydraulic spool valve block is not set properly or defective - Change or adjust properly |
| Hydraulic cylinder is not working - Check cylinder components for wear or damage and change if necessary |
| Worn lift arm shaft - Install a new shaft |
| The hitch has internal mechanical malfunctions - Change worn or defective hitch components |
| Hitch lowering or lifting is not smoothly |
| Air in hydraulic system - Check the suction pipe, fittings, and pump seals |
| Dirty hydraulic fluid - The fluid must be changed |
| Hydraulic pump failure - Check pump capacity and change if necessary |
| Hydraulic control valve is not set properly or defective - Adjust properly or change |
| Faulty hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary |
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| Farm Tractors Technical Specifications |
