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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
Engine stalls at idle
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 is overheated
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
Reduced engine power
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
Engine noises or knocks
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
Starter turns slow
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
External fluid leaks
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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