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Kubota G26 Troubleshooting
The
Kubota G26 is a 4WD diesel lawn tractor with heavy duty front axle. This model
was manufactured from 2009 to 2015. The Kubota G26 driveline consists of a 61.1
cu.in (1L) Kubota D1005 4-cycle vertical 3-cylinder naturally aspirated
water-cooled diesel engine with a rated power of 24.5 hp (18.5 kW), and
hydrostatic transmission with infinite forward and reverse gears.
Max. forward speed - 10.6 mph (17 kph), maximum reverse speed - 6.3 mph
(10 kph). The Kubota G26 is equipped with a full hydrostatic power
steering, wet-type PTO clutch, wet disc brakes, 16x7.50-8 front tires,
and 24x12.00-12 rear tires.
The wheel base is 57.7" (1460 mm). The diesel lawn tractor is compatible
with a 54" mid-mount 2-blade rear discharge Kubota RCK54 mower deck with
cutting height of 1.0-4.0" (25-102 mm), lifting height of 5.93" (150
mm), and hydraulic lift system.
| Diesel Engine Troubleshooting |
| Engine is not starting or hard starting |
| Clogged fuel filter element - Clean the filter element |
| The fuel shut-off valve is closed - Open fuel shut-off valve |
| Fuel-line is leaking air - Retighten clamps, replace defective pipes |
| Dirty or faulty injectors - Service or change fuel injectors |
| Fuel injection pump damage - Replace or rebuild injection pump |
| Engine has bad compression - Check cylinder block and change faulty parts |
| Engine stalls during operation |
| Coolant temperature is low - Warm up the engine |
| Air in fuel system - Air-bleed fuel system |
| Irregular fuel injection - Adjust fuel injection timing |
| Fuel filter is dirty - Service or replace the filter |
| Dirty or faulty injectors - Service or change fuel injectors |
| Diesel engine stops after starting |
| Fuel injection pump out of timing - Correct injection timing |
| Plugged fuel filter - Replace filter element |
| Dirty or defective injector nozzles - Replace fuel injector nozzles |
| Fuel injection pump is not working correctly - Rebuild or replace pump |
| Dirty air cleaner element - Change or service air cleaner element |
| Wrong adjustment of low idle speed - Correct low idle settings |
| Damaged fuel injection pump - Repair or install new pump |
| Fuel injector nozzles are faulty - Service or replace injector nozzles |
| Excessive valve clearance - Adjust to proper valve clearance |
| Lack of engine coolant - Top up coolant. Check system for leaks |
| Cooling system components are damaged or system is dirty - Service the cooling system or change faulty parts |
| Lack of engine oil - Fill up the engine oil |
| Fan belt tension is unadjusted or belt is worn - Adjust belt tension properly or change it |
| Thermostat malfunction - Check thermostat, replace if necessary |
| Clogged or damaged injectors - Service or change fuel injectors |
| Fuel injection pressure is wrong - Test fuel injection pressure and adjust it correctly |
| Dirty air filter element - Service or replace the air filter |
| Dirty oil filter - Service or change engine oil filter element |
| Engine is under excessive load - Change to lower gear or reduce load |
| Valve clearance is not correct - Adjust valve clearance |
| Too low idle RPM - Adjust the low idle speed |
| Dirty fuel hoses or pipes - Clean fuel pipes and hoses |
| Low engine compression: Valves are damaged or leaking - Change the valves |
| Incorrect setting of fuel injection pump timing - Correct injection timing |
| Clogged or damaged injector nozzles - Replace fuel injector nozzles |
| Engine oil level is insufficient - Fill up the oil to required level |
| Low coolant temperature - Warm up the engine |
| Main bearings or crankshaft failure - Have bearings or crankshaft replaced |
| Piston rings are defective or broken - Replace the piston rings as required |
| Loose flywheel bolts - Check flywheel bolts and tighten properly |
| Engine using too much oil |
| Oil leakage: Worn seals or gaskets - Worn parts need to be replaced |
| Oil viscosity is wrong - Use oil of correct viscosity |
| Damaged or seized piston rings - Piston rings need to be replaced |
| Worn valve guides and valve stems - Valves must be replaced |
| Pistons or cylinder liners are damaged - Check pistons and liners, change as required |
| Hydrostatic Transmission Troubleshooting |
| HST transmission noise |
| Worn or unadjusted speed control linkage - Adjust or repair linkage |
| Excessive transmission load - Reduce the load is required |
| Low transmission oil level or contaminated oil - Change transmission oil or top up to proper level |
| Transmission components are damaged or worn - Replace or repair defective components |
| Shift linkage is loose or broken - Service or change the linkage |
| Stuck or defective hydrostatic pump - Repair or change pump |
| Damaged or unadjusted transmission shift control components - Replace or adjust as required |
| Lack of transmission oil supply - Need to add transmission oil |
| Drive sheave is damaged or worn - Change sheave |
| Shifter linkage is not adjusted or faulty - Adjust correctly or change linkage |
| Speed control linkage is defective or unadjusted - Adjust or change linkage |
| Transmission gaskets or seals are worn - Replace gaskets or seals |
| Final drive shaft leakage - Replace shaft seals |
| Transmission housing is cracked - Housing needs to be replaced |
| Mower Deck Troubleshooting |
| Excessive mower vibration |
| Mower deck drive sheave is clogged or worn - Service or change sheave |
| Defective or loose drive belt - Adjust belt tension or change the belt |
| Warped or not balanced mower blades - Replace or balance blades |
| Loose blade bolts tightening - Tighten it fast |
| Discharge chute keeps clogging |
| Ground speed is too fast - Use a slower speed |
| Grass is too high - Adjust mower to lower cutting height |
| Reduced engine speeds - Throttle is not fully open |
| Mower deck set to low cutting - Use correct cutting height |
| Incorrect mower drive belt installation - Check drive belt for correct installation |
| Lawn mower leaving uncut grass |
| Cutting deck clogging - Mower deck needs to be cleaned |
| Blades are not sharp - Sharpen the blades |
| Worn or damaged blades - Blades need to be replaced |
| Mowing speed is too high - Use a lower speed |
| Cutting level is too low - Need to set high cutting height |
| Grass bag is full - Empty the grass bag |
| Blades are scalping the grass |
| Bumpy or not smooth lawn - Roll or level the lawn |
| Mower cuts too low - Must be set to high cutting height |
| High ground speed - Operate at slower speed |
| Improper mower deck level - Adjust mower deck level properly |
| Blades are bent or worn - Change the blades |
| Tires are not correctly inflated - Correct tire pressure |
| Tires are not correctly inflated - Need to inflate tires |
| Mower deck is not leveled properly - Level the deck properly |
| Blades are not sharp - Sharpen the blades |
| Worn or bent blades - Blades must be changed |
| Mower deck is clogged - Clean mower deck as required |
| Deck housing is broken - Repair or change the deck |
| Loose or faulty mower spindle - Repair or replace the spindle |
| Electrical Troubleshooting |
| Battery won’t charge |
| Loose or corroded cable connections - Tighten or clean connections |
| Defective battery terminal clamps - Replace terminal clamps |
| Bad cell in battery - Battery change required |
| Low battery capacity - Battery needs to be recharged |
| Battery is draining quickly - Service or replace the battery |
| Corroded battery terminals or disconnected wires - Check cables and clean or change terminals |
| Battery is discharged or worn - Recharge or change battery |
| Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required |
| Low battery voltage - Battery needs to be recharged |
| Spark plug gapped improperly or faulty - Replace or clean and gap |
| Starter motor or solenoid failing - Change solenoid or repair starter |
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| Lawn and Garden Tractors Technical Specs |
