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Kubota L175 Troubleshooting
The
Kubota L175 is a two-wheel drive sub-compact utility tractor. This model was
manufactured from 1973 to 1976. The Kubota L175 tractor is equipped with Kubota
Z750-A four-stroke vertical 2-cylinder naturally aspirated diesel engine.
A 45.3 cubic inches (0.74 L) engine has a cylinder bore of 3.02" (76
mm), piston stroke of 3.25" (82 mm), and rated power of 17 hp (12.7 kW).
The mechanical transmission includes a dry single-plate clutch and
sliding mesh gearbox with 8 forward and 2 revers gears. The maximum
travel speed (forward/reverse): 13.1 mph (21 km/h) and 9 mph (14.5
km/h).
The open center hydraulic system used a gear pump with rated fluid flow
of 3.7 gal/min (14.1 l/min). The hydraulic system pressure is 1700 psi
(117 bar). The Kubota L175 was equipped with a manual steering system,
mechanical expanding shoe brakes, 4.00x12 front tires, and 8.4x24 rear
tires. The wheel base is 57 inches (1443 mm). The tractor is compatible
with Kubota L1200 loader.
| Engine Troubleshooting |
| Engine won't start or difficult to start |
| Fuel filter plugging - Clean or change the filter |
| Fuel shut-off valve closed - Open the fuel shut-off valve |
| Air in fuel system - Air-bleed fuel system |
| Fuel injectors are damaged or dirty - Inspect fuel injectors and replace if necessary |
| Fuel injection pump is not working correctly - Install a new fuel pump or repair |
| Low cylinder compression - Inspect cylinder block and change worn parts |
| Engine shuts off while driving |
| Low coolant temperature - Warm up engine as required |
| Air in fuel system - Air-bleed fuel system |
| Bad fuel injection - Check and adjust |
| Fuel filter is clogged - Change filter element |
| Faulty or dirty injectors - Change fuel injectors |
| Engine starts and stalls immediately |
| Timing of fuel injection pump is wrong - Check and correct settings |
| Fuel filter plugging - Change filter element |
| Clogged or defective injector nozzles - Inspect injector nozzles and change if required |
| Fuel injection pump malfunctioning - Replace injection pump or repair it |
| Dirty air cleaner element - Replace or clean the air cleaner element |
| Incorrect low idle speed adjustment - Correct low idle settings |
| Faulty fuel injection pump - Rebuild or change fuel pump |
| Fuel injector nozzles are damaged or dirty - Install a new set of well-balanced nozzles |
| Valve clearance is out of adjustment - Adjustment procedure required |
| Engine has a lack of coolant - Refill to the correct level. Check and repair damage to the cooling system if required |
| Cooling system is dirty or cooling components are failed - Service the cooling system or change faulty parts |
| Engine oil insufficient - Checking oil level and add if necessary |
| Damaged fan belt or unadjusted belt tension - Adjust as required or change belt |
| Thermostat fault - Thermostat needs to be replaced |
| Fuel injectors are damaged or dirty - Test fuel injectors and change if necessary |
| Incorrect fuel injection pressure - Adjust pressure to proper level |
| Air filter element clogging - Service or replace the air filter |
| Oil filter is dirty - Change or clean engine oil filter element |
| Engine is under excessive load - Shift to lower gear or reduce the load |
| Valve clearance is out of adjustment - Adjust valve clearance |
| Incorrect low idle speed adjustment - Adjust low idle speed |
| Fuel hoses or pipes are dirty - Clean fuel system pipes and hoses |
| Loss of compression: Intake or exhaust valves are damaged - Valve replacement required |
| Incorrect setting of fuel injection pump timing - Fuel injection pump timing adjustment needs to be corrected |
| Fuel injector nozzles fault - Install new set of properly balanced nozzles |
| Engine oil insufficient - Check oil level and add oil as required |
| Engine is not fully warmed up - Warm up engine as required |
| Main bearings or crankshaft are worn out - Repair or replace defective parts |
| Broken or worn piston rings - Have piston rings replaced |
| Flywheel mounting screws are loose - Tighten the screws |
| Engine consuming too much oil |
| Oil leaking: Gaskets or seals may be damaged - Install new components |
| Improper oil viscosity - Use proper viscosity oil |
| Piston rings are stuck or worn - Piston rings need to be replaced |
| Valve stems and guides are worn - Valves replacement required |
| Cylinder liners or pistons are worn - Inspect pistons and liners, change as required |
| Electrical System Troubleshooting |
| Battery won’t charge |
| Battery failing - Battery replacement required |
| Bad battery electrical wire harness - Check wires for malfunctions, repair or replace |
| Loose or corroded battery cables and terminals - Service or tighten battery cables and terminals |
| Incorrect belt tension adjustment or worn belt - Replace belt or properly adjust belt tension |
| Low battery output - Battery needs to be recharged |
| Battery discharges quickly - Service battery or replace it |
| Battery wiring harness failure - Inspect electrical cables for defects, repair or replace |
| Corroded or loose terminals and cables - Clean or tighten terminals and cables |
| Starter motor is not working |
| Low battery power - Recharge the battery |
| Drained or worn battery - Recharge or replace battery |
| Starter motor failure - Repair or replace starter |
| Battery cables are disconnected or incorrectly connected - Check cables and reconnect it correctly |
| Transmission Troubleshooting |
| Gears are hard to shift |
| Clutch is unadjusted or worn - Clutch replacement or adjustment required |
| Gear shift linkage is loose or broken - Service or replace shift linkage |
| Damaged or worn shift forks - Change defective shift forks |
| Worn gear shift mechanism - Replace worn components |
| Insufficient transmission fluid pressure |
| Oil level is low - Correct the transmission oil level |
| Clogged transmission fluid filter element (if fitted) - Change or service the transmission fluid filter |
| Faulty relief valve - Replace the valve |
| Transmission is excessively noisy |
| Bearings are worn or damaged - Change faulty bearings |
| Not enough fluid in transmission - Fill the transmission housing with fluid |
| Contaminated transmission fluid - Transmission fluid must be changed |
| Gears are defective or backlash is incorrect - Change damaged gears or adjust backlash properly |
| Shift forks are worn or damaged - Change defective shift forks |
| Worn gaskets or seals - Change defective gaskets or seal |
| Cracked transmission housing - Housing needs to be replaced |
| Hydraulics Troubleshooting |
| Hydraulic system overheated |
| Hydraulic system pressure is not corrected - The pressure must be adjusted correctly |
| Main relief valve is damaged or adjusted improperly - Adjust the valve or replace if necessary |
| Dirty hydraulic fluid - The fluid must be changed |
| Aeration in hydraulic system - Inspect the suction pipe, fittings, and pump seals |
| Low hydraulic oil pressure |
| Lack of hydraulic oil - Add oil to the hydraulic system |
| Hydraulic fluid filter is dirty - Replace hydraulic filter element or service if necessary |
| Defective hydraulic pump - Check hydraulic pump flow and replace pump if necessary |
| Damaged or incorrect adjusted hydraulic spool valve - Adjust properly or change |
| Hydraulic cylinder is not working - Check cylinder components for damage or wear and change if necessary |
| Hydraulic lines are leaking - Identify leaks in the system and repair it |
| Three-point hitch lifting is too slow or cannot be lifted |
| Hydraulic fluid level is insufficient - Need to add fluid |
| Cold fluid in hydraulic system - Wait for fluid to warm up |
| Hydraulic oil filter element is dirty - Clean or change hydraulic filter |
| Hydraulic pump malfunction - Test the pump performance and change pump if required |
| Unadjusted or defective main relief valve - Adjust relief valve or change if required |
| Damaged or incorrect adjusted hydraulic control valve - Set properly or replace |
| Broken hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary |
| Broken or disconnected suction line - Connect or replace |
| Hitch not dropping or hitch drops slowly |
| Hydraulic control valve block is not set properly or defective - Adjust correctly or replace |
| Hydraulic cylinder is not working - Inspect cylinder parts for wear or damage and replace if required |
| Damaged hitch cross shaft - Install a new shaft |
| Mechanical components of the hitch are defective - Change defective or worn hitch parts |
| Hitch jerks when lift or lower |
| Hydraulic system sucks air - Check the suction pipe, fittings, and pump seals |
| Hydraulic fluid is dirty - Hydraulic fluid change required |
| Hydraulic pump failure - Test pump flow rate and replace pump if required |
| Faulty or incorrect setting hydraulic control valve - Replace or set properly |
| Hydraulic cylinder is faulty - Check cylinder parts for wear or damage and replace if necessary |
| Steering System Troubleshooting |
| Hard Steering |
| Steering knuckle or steering column is stuck - Inspect steering column and knuckle, replace worn parts |
| Steering gearbox components are worn - Replace defective components of steering gearbox |
| Faulty drag link or tie rod - Replace or repair |
| Insufficient lubrication in steering box - Need to lubricate the gearbox |
| Not adjusted toe-in alignment - Check and adjust toe-in |
| Tires are not correctly inflated - Inflate tires as necessary |
| Excessive steering wheel free play |
| Steering column bearing or shaft is worn - Change faulty parts |
| Steering linkage assembly is worn or loose - Repair or replace steering linkage |
| Worn steering gearbox bearings - Replace the bearings |
| Front wheel hub bearings or steering knuckles are worn - Change hub bearings or knuckles |
| Damaged or worn steering tie-rod ends - Change faulty part |
| Tractor pulls to right or left |
| Worn or loose steering linkage assembly - Repair or replace steering linkage |
| Defective steering knuckle bushing - Replace knuckle bushing |
| Uneven tire pressure - Inflate the tires properly |
| Toe-in adjustment is incorrect - Adjust toe-in correctly |
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| Farm Tractors Technical Specifications |
