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Caterpillar 226D Troubleshooting

The Caterpillar 226D skid steer loader is powered by 134.3 cu.in (2.2L) Caterpillar C2.2T 4-cycle 4-cylinder turbocharged liquid-cooled diesel engine with a rated power of 65.8 hp (49.1 kW) at 3000 rpm. The Cat 226D is equipped with a radial-lift loader boom, one-speed or two-speed hydrostatic transmission, 80HS drive chains, and 10.00x16.5 standard tires. The hydraulic system has a pump with fluid flow rate of 18 gpm (69 lpm) or 26 gpm (99 lpm). The skid steer loader has a rated operating capacity of 1550 lbs (703 kg) and tipping load of 3100 lbs (1407 kg). The lift height is 111 inches (2820 mm) to hinge pin, and dump height is 81.8 inches (2075 mm).

Engine Troubleshooting

Engine starts hard or doesn't start
Air in the fuel pipes - Bleed the fuel pipes.
Clogged fuel filter - Install new filter element.
Dirty or damaged injection nozzles - Install a new kit of correctly balanced nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
Excessive valve clearance - Check and adjust as required.
Defective fuel injection pump - Change pump or rebuild it.

Engine starts and immediately shuts off
Dirty air cleaner - Install new air cleaner element.
Fuel filter plugged - Change filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Fuel injectors are dirty or defective - Clean fuel injectors or change it.
Defective fuel injection pump - Replace injection pump or repair it.

Engine stops suddenly during operation
Engine is not fully warmed up - Warm up to required temperature.
Dirty fuel filter - Change filter element.
Air in the fuel system - Air bleeding.
Fuel injection nozzles are damaged or dirty - Replace injection nozzles.
Improper fuel injection timing - Check the fuel injection pump timing adjustment.

Engine stops while idling
Low idle speed set incorrectly - Normalize low idle speed.
Fuel injection pump malfunction - Rebuild or change fuel pump.
Fuel injector fault - Inspect fuel injectors and change as required.
Valve clearance is not correct - Check and adjust.

Engine power is insufficient
Air filter is plugged - Clean or change.
Clogged or burnt injection nozzle - Inspect nozzles and replace if necessary.
Fuel injection pressure is wrong - Check the fuel injection pressure and adjust if necessary.
Incorrect valve clearance - Check and adjust.
Incorrect low idle setting - Adjust as required.
Dirty fuel hoses or lines - Service fuel lines and hoses.
Cylinder head gasket is defective - Install a new gasket.
Leaking or defective piston rings - Replace piston rings.

Engine is overheated
Low engine coolant - Fill the cooling system and check components for leaks or other faults.
Insufficient engine oil - Check oil level and add oil as required.
Clogged radiator fins or damaged radiator cap - Install new cap or clean radiator.
Fan belt is broken or worn - Belt replacement is recommended.
Engine is under excessive load - Load reducing required.

Low oil pressure
Not enough oil in the engine - Checking oil level and add if necessary.
Dirty oil filter element - Clean or change engine oil filter.
Incorrect engine oil Drain crankcase and refill with correct oil.
Incorrect oil clearance in crankshaft bearing - Install new bearings.
Oil pump malfunction - Install a new pump.

Abnormal engine noise or knocking
Insufficient engine oil - Fill the crankcase with engine oil.
Engine not warmed up - Warm up the engine.
Wrong setting of fuel injection pump timing - Adjust as recommended.
Incorrectly adjusted low idle speed - Correct low idle adjustment.
Defective fuel injectors - Clean fuel injectors or change it.
Connecting rod misalignment or failure - Need to replace or align the connecting rod.
Worn or broken pistons - Replace the pistons as required.

Drive System Troubleshooting

Drive system сan't work in either direction
Hydraulic fluid level low - Fill the system to proper hydraulic fluid level.
Drive chain fault - Inspect drive chain and replace faulty components.
Defective or worn relief valve - Repair or change.
Clogged suction line or hydraulic filter - Replace hydraulic filter or clean suction line.
Worn or defective hand or foot controls - Replace or repair.
Drive motor or pump failure - Replace or repair faulty component.

Reduced power
Hydraulic oil filter is clogged - Replace or clean hydraulic filter.
Relief valve is worn or opened - Change or close relief valve.
Transmission components are defective or worn - Inspect and replace defective parts.
Input drive shaft is stuck - Repair or replace faulty drive shaft.
Air in the hydraulic system - Need to bleed air.

Drive system is overheated
Low hydraulic oil level - Check and refill the hydraulic oil.
Clogged hydraulic fluid filter - Check, clean, or replace as required.
Relief valve worn or defective - Service or change relief valve.
Worn hydraulic motor or drive pump - Inspect and change as required.
Oil cooler is clogged - Clean cooling fins as required.
Drive system is overloaded - Reduce drive system load.

Drive system is excessively noisy
Oil viscosity is too heavy - Use oil of correct viscosity.
Air trapped in hydraulic system - Bleed air from system.
Worn hydraulic motor or drive pump - Check and repair if required.
Defective or worn mechanical parts of drive system - Inspect the components for defect or damage and repair as needed.

Hydraulics Troubleshooting

Hydraulic system overheats
Hydraulic pressure incorrectly adjusted - Adjust it correctly.
Main relief valve improper adjustment or failure - Adjust or change relief valve.
Hydraulic oil contamination - Change hydraulic oil.
Not enough hydraulic fluid in the system - Fill the hydraulic system with oil.
Hydraulic pump is faulty - Install new pump or repair it.

Lift arm won't raise or lower
Lift controls malfunction - Inspect and repair if necessary.
Defective hydraulic pump - Repair or install new hydraulic pump.
Hydraulic control valve failure - Change or repair hydraulic valve.
Hydraulic cylinder malfunction - Install a new boom cylinder or repair it.
Low hydraulic fluid level - Add fluid as required.

Bucket can't tilt
Defective bucket controls - Check and repair as required.
Hydraulic pump failure - Repair or replace pump if necessary.
Hydraulic control valve is defective - Change or repair hydraulic valve.
Bucket cylinder failure - Change or repair cylinder.
Low hydraulic fluid level - Fill the system to proper hydraulic fluid level.

Boom or bucket is moving slowly
Hydraulic pump is worn - Check the pump performance and replace it if required.
Leaking hydraulic cylinder - Install new cylinder seals.
Insufficient hydraulic fluid - Fill up the hydraulic fluid.
Hydraulic control valve is unadjusted or worn - Set properly or repair.
Hydraulic system loosing pressure - Adjust pressure as required.

Bucket or boom is moving jerkily
Air leaks in hydraulic system - Air bleeding is required.
Hydraulic oil filter element clogging - Clean or change the filter.
Contaminated hydraulic oil - Hydraulic oil change required.
Cylinder rod or tube is scratched - Change worn component.

Hydraulic pump is noisy
Lack of oil or hydraulic leakage - Top up hydraulic oil or remedy leakage in system.
Hydraulic filter is dirty - Change or clean oil filter.
Suction line is dirty - Need to service the suction line.
Air enters the pump - Bleed air from hydraulics.
Damaged pump parts - Change or rebuild pump.

Electrical Troubleshooting

Battery won’t charge
Loose or corroded wire connections - Tighten or service cable connections.
Battery terminal connectors are defective - Terminal connectors should be replaced.
Defective battery - Use a new battery.
Loose or damaged belt - Adjust belt tension or install a new belt.

Starter cranks slow
Low battery capacity - Recharge the battery.
Battery runs out quickly - Battery needs to be serviced or replaced.
Terminals are faulty or battery cables are disconnected - Connect wiring properly or install new terminals.

Starter doesn't crank
Battery is drained or defective - Replace or charge as required.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery output - Charge the battery.
Faulty starter motor - Starter needs to be changed.