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| Home / Skid Steer Loaders / Caterpillar Skid Steer Loaders / Cat 248 |
Caterpillar 248 Troubleshooting
The
Cat 248 skid steer loader driveline system components: Caterpillar 3034T 4-cycle
vertical 4-cylinder direct injection turbocharged liquid-cooled diesel engine
with a rated power of 74 hp (55 kW), and single-speed hydrostatic transmission.
The hydraulic system has a pump with a rated capacity of 22 gal/min (83 l/min)
or 33 gal/min (125 l/min). The Caterpillar 248 is equipped with radial-lift
loader boom, 100HS roller drive chains, and 12.00x16.5 tires. The loader has a
boom breakout force of 4300 lbs (1955 kg) and bucket breakout force of 5250 lbs
(2385 kg). The rated operating capacity is 2000 lbs (907 kg), and tipping load
is 4000 lbs (1815 kg).
| Engine Troubleshooting |
Engine hard to start or won't start
Air in the fuel system - Air bleeding.
Dirty fuel filter - Replace filter element.
Fuel injection nozzles are dirty or defective - Check and replace nozzles if required.
Water or dirt in fuel system - Drain, flush, and service the system.
Improper valve clearance - Adjustment procedure required.
Fuel injection pump malfunctioning - Replace injection pump or repair it.
Engine starts but then stalls
Dirty air cleaner - Clean or change cleaner.
Fuel filter plugging - Change or clean the filter element.
Poor fuel injection pump tightness - Look for any leaks of fuel pump, tighten it fast.
Damaged or clogged injectors - Clean or replace fuel injectors.
Fuel injection pump malfunctioning - Replace injection pump or repair it.
Engine stops running suddenly
Low coolant temperature - Warm up the engine.
Dirty fuel filter - Change filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Clogged injection nozzle - If necessary, replace with a new nozzle.
Improper fuel injection timing - Set up as recommended.
Engine stops when idle
Incorrect low idle setting - Adjust as required.
Fuel injection pump is broken - Repair or replace injection pump.
Dirty or defective injectors - Replace fuel injectors.
Excessive valve clearance - Check and adjust.
Diesel power loss
Air filter is plugged - Replace or clean air filter element.
Clogged or burnt injection nozzle - Install a new kit of correctly balanced nozzles.
Uneven fuel injection pressure - Check the fuel injection pressure and adjust if necessary.
Improper valve clearance - Adjust valve clearance.
Wrong adjustment of low idle speed - Correct low idle settings.
Fuel lines or hoses are clogged - Fuel lines and hoses need to be cleaned.
Defective cylinder head gasket - Gasket should be replaced.
Piston rings are damaged or leaking - Replace piston rings.
Engine overheating
Insufficient coolant - Fill radiator to proper level and check components for faults.
Engine oil insufficient - Check and refill engine oil.
Clogged radiator fins or leaking radiator cap - Clean radiator or change cap.
Fan belt is worn or faulty - Fan belt must be replaced.
Engine overload - Load reducing required.
Oil pressure is insufficient
Not enough oil in the engine - Fill up the engine oil.
Clogged oil filter element - Change or clean engine oil filter element.
Oil grade or viscosity is wrong - Use oil of correct viscosity.
Incorrect oil clearance in main bearing - Bearing needs to be changed.
Defective oil pump - Repair or change.
Engine knocks or noises
Not enough engine oil - Fill up the engine oil.
Engine is cold - Warm up engine as required.
Incorrect adjustment of fuel injection pump timing - Adjust the pump as required.
Low idle speed set incorrectly - Adjust as required.
Damaged or clogged injectors - Change or clean fuel injectors.
Connecting rod failure or misalignment - Align or change connecting rod.
Pistons are worn or broken - Replace the pistons.
| Drive System Troubleshooting |
Machine will not move in either direction or one direction
Hydraulic oil level is low - Checking hydraulic oil level and add if necessary.
Drive chain failure - Inspect drive chain and replace faulty parts.
Relief valve failure - Change or repair relief valve.
Clogged hydraulic filter or suction line - Service suction line or change hydraulic filter.
Worn or damaged foot or hand controls - Repair or replace.
Drive pump or motor is damaged - Repair or change faulty component.
Low power
Dirty hydraulic oil filter - Check, clean, or change as necessary.
Faulty or opened relief valve - Close or replace relief valve.
Transmission components are damaged or faulty - Inspect and change defective parts.
Worn input drive shaft - Repair or replace drive shaft.
Air trapped in hydraulic system - Need to bleed air.
Overheated drive system
Hydraulic oil level is low - Need to add oil.
Dirty hydraulic fluid filter - Change or service hydraulic filter.
Relief valve is worn or damaged - Change or repair relief valve.
Damaged drive pump or hydraulic motor - Inspect and replace as necessary.
Clogged hydraulic oil cooler - Cooling fins need to be cleaned.
Drive system is overloaded - Load should be reduced.
Drive system makes excessive noise
Incorrect oil viscosity - Use correct oil viscosity.
Air trapped in hydraulic system - Bleed air from system.
Drive pump or hydraulic motor malfunction - Inspect and change as required.
Mechanical components of drive system are defective or worn - Inspect drive system and replace faulty components.
| Hydraulics Troubleshooting |
Hydraulic system overheating
Hydraulic pressure incorrectly adjusted - Adjust it correctly.
Unadjusted or defective main relief valve - Adjust the valve or replace if necessary.
Hydraulic fluid is dirty - The fluid must be changed.
Lack of hydraulic oil - Add oil to the hydraulic system.
Hydraulic pump is faulty - Change or repair hydraulic pump if required.
Lift arm fails to drop or lift
Damaged lift controls - Replace or repair.
Damaged hydraulic oil pump - Repair or change pump if required.
Damaged hydraulic control valve - Install a new valve or repair it.
Hydraulic cylinder is faulty - Change or repair lift cylinder.
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.
Bucket won't move
Defective bucket controls - Repair or change.
Hydraulic pump failure - Repair or install new hydraulic pump.
Hydraulic control valve is faulty - Install a new valve or repair it.
Hydraulic bucket cylinder is broken - Replace or repair cylinder.
Hydraulic oil is insufficient - Check and refill the hydraulic oil.
Boom or bucket moves slowly
Hydraulic pump is defective - Test the pump performance and change pump if required.
Hydraulic cylinder leaking - Install new cylinder seals.
Insufficient hydraulic oil - Fill the system to proper hydraulic oil level.
Hydraulic control valve is not set properly or defective - Repair or adjust correctly.
Hydraulic pressure has dropped - Correct setting is required.
Lift arm or bucket is jerky
Hydraulic system is leaking air - Need to bleed air.
Clogged hydraulic oil filter element - Change or clean oil filter.
Hydraulic fluid contamination - Change hydraulic fluid.
Scored cylinder tube or rod - Replace defective component.
Hydraulic pump makes excessive noise
Not enough oil or hydraulic system leaking - Add hydraulic oil or correct system leaks.
Hydraulic filter is dirty - Clean or install new filter.
Dirty suction line - Clean suction line as required.
Pump is sucking air - Remove air from hydraulics.
Pump parts are damaged - Rebuild or install new pump.
| Electrical Troubleshooting |
Battery won’t charge
Wiring connections are loose or corroded - Tighten or service connections.
Battery terminal clamps are faulty - Terminal clamps should be changed.
Dead cell in battery - Use a new battery.
Belt is defective or loose - Adjust belt tension or install a new belt.
Starter cranks slow
Low battery power - Low battery charging, charge as required.
Battery discharges quickly - Service or replace the battery.
Disconnected battery cables or bad terminals - Connect cables correctly or replace terminals.
Starter will not crank
Battery is drained or worn - Need to charge or replace the battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Battery power is low - Recharge the battery.
Starter motor is faulty - Starter should be replaced.
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| SKID STEER LOADERS SPECIFICATIONS |