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Case 70XT Troubleshooting

The Case 70XT skid steer loader is powered by 239 cu.in (3.9L) Case 4T-390 four-cylinder direct injection turbocharged diesel engine with a rated power of 85 hp (63.4 kW) at 2200 rpm. The Case 70XT is equipped with 1-speed transmission, axial piston drive pumps, 100HS continuous roller chains, and 12x16.5 standard tires. The hydraulic system has a pump with fluid flow rate of 21 gpm (79.4 lpm). The hydraulic pressure is 3000 psi (207 bar). The skid steer loader has a rated operating capacity of 2000 lbs (908 kg) and tipping load of 4000 lbs (1816 kg). The lift height is 121.5 inches (3090 mm) to hinge pin, and dump height is 96.6 inches (2450 mm).

Engine Troubleshooting

Diesel hard to start or doesn't start
Air in the fuel pipes - Bleed the fuel pipes.
Fuel filter element clogging - Clean the filter or install new filter element.
Faulty or dirty injection nozzles - Install a new kit of correctly balanced nozzles.
Water in the fuel system - Change fuel and repair fuel system.
Valve clearance is out of adjustment - Check and adjust as required.
Fuel injection pump is defective - Install a new pump or rebuild.

Diesel starts but then stops
Air filter is clogged - Replace or clean air filter element.
Fuel filter element clogging - Change the filter element.
Fuel injection pump leakage - Check the fuel injection pump for leaks and fix it.
Dirty or defective injectors - Clean or replace fuel injectors.
Defective fuel injection pump - Rebuild or replace pump.

Engine stops running suddenly
Engine is not preheated - Warm up to required temperature.
Dirty fuel filter - Replace the filter element.
Air in fuel system - Bleed fuel system.
Defective injection nozzle - Check injection nozzles and replace if required.
Fuel injection pump timing is wrong - Check the fuel injection pump timing adjustment.

Engine stalls when idling
Incorrect low idle setting - Correct the settings.
Fuel injection pump failure - Repair or replace injection pump.
Fuel injectors are dirty or defective - Replace or clean fuel injectors.
Valve clearance is not correct - Correct valve clearance.

Engine power is insufficient
Plugged air cleaner - Service or replace air cleaner.
Faulty or dirty injection nozzles - Check injection nozzles and replace if required.
Insufficient fuel injection pressure - Adjust pressure to proper level.
Incorrect valve clearance - Adjust valve clearance.
Low idle speed setting is incorrect - Test and adjust.
Restricted fuel lines or hoses - Fuel hoses and lines must be clean.
Cylinder head gasket defective - Install a new gasket.
Worn or broken piston rings - Change piston rings.

Engine overheats
Insufficient coolant fluid - Top up coolant fluid and check system for leaks.
Lack of engine oil - Checking oil level and add if necessary.
Radiator core is clogged or radiator cap is leaking - Change cap or clean radiator.
Broken or loose fan belt - Change the fan belt.
Diesel engine overloaded - Load reducing required.

Oil pressure is insufficient
Insufficient engine oil - Check oil level and add oil as required.
Oil filter is dirty - Change or service engine oil filter.
Improper type of engine oil - Use oil of proper viscosity.
Crankshaft bearing oil clearance is incorrect - Install new bearings.
Oil pump failure - Replace as required.

Engine noise or knocking
Lack of engine oil - Check and refill engine oil.
Engine is cold - Warm up the engine.
Improper fuel injection timing - Set the fuel pump timing correctly.
Wrong adjustment of low idle speed - Adjust low idling as recommended.
Fuel injectors are dirty or defective - Replace or clean fuel injectors.
Misaligned or faulty connecting rod - Connecting rod needs to be replaced or aligned.
Worn or scored pistons - Replace the pistons.

Drive System Troubleshooting

Drive system does not work in either direction
Low hydraulic fluid level - Check and refill the hydraulic fluid.
Drive chain malfunction - Check drive chain and change faulty components.
Input drive shaft failure - Repair or install a new drive shaft.
Faulty relief valve - Repair or install a new relief valve.
Suction line or hydraulic filter is plugged - Service suction line or change hydraulic filter.
Worn or damaged foot or hand controls - Repair or change.
Drive pump or motor malfunction - Repair or replace faulty component.

Power is too low
Clogged hydraulic oil filter - Replace or service hydraulic filter.
Opened or worn relief valve - Change or close relief valve.
Transmission components are defective or worn - Check and change defective components.
Input drive shaft is defective - Change or repair faulty drive shaft.
Air in the hydraulic system - Bleed hydraulic system.

Drive system overheating
Hydraulic oil level is low - Need to add oil.
Hydraulic fluid filter is dirty - Replace hydraulic filter.
Defective relief valve - Change or repair defective relief valve.
Damaged drive pump or hydraulic motor - Inspect and replace as necessary.
Clogged hydraulic oil cooler - Clean the cooling fins.
Drive system is overloaded - Reduce drive system load.

Drive system is noisy
Improper oil viscosity - Use the specified type of oil.
Air in hydraulic system - Need to bleed air.
Drive pump or hydraulic motor is damaged - Repair or replace faulty component.
Mechanical parts of drive system are damaged or worn - Inspect the parts for worn or defect and repair as needed.

Hydraulics Troubleshooting

Hydraulic system has overheating
Hydraulic pressure incorrectly adjusted - Hydraulic pressure must be set correctly.
Main relief valve is damaged or adjusted improperly - Adjust the valve or replace if necessary.
Hydraulic fluid is dirty - Change hydraulic fluid.
Lack of hydraulic fluid - Add fluid to the hydraulic system.
Hydraulic pump is defective - Replace or repair pump if necessary.

Lift arm fails to drop or lift
Faulty lift controls - Inspect and repair if necessary.
Hydraulic pump failure - Repair or change pump if required.
Damaged hydraulic control valve - Repair or replace hydraulic valve.
Faulty hydraulic cylinder - Repair or change hydraulic cylinder.
Hydraulic fluid level low - Checking hydraulic fluid level and add if necessary.

Bucket does not tilt
Damaged bucket controls - Inspect and repair if necessary.
Defective hydraulic pump - Repair or install new hydraulic pump.
Hydraulic control valve failure - Repair or replace the valve.
Hydraulic bucket cylinder not working - Repair or install a new cylinder.
Hydraulic oil is insufficient - Need to add oil.

Boom or bucket moves slowly
Hydraulic pump is faulty - Check hydraulic pump flow and replace pump if necessary.
Oil leaks from hydraulic cylinder - Change cylinder piston seals.
Insufficient hydraulic fluid - Fill up the hydraulic fluid.
Worn or unadjusted hydraulic control valve - Repair or adjust properly.
Hydraulic pressure has dropped - Adjust pressure as required.

Lift arm or bucket is working jerkily
Air in the hydraulic system - Bleed air from hydraulic system.
Plugged hydraulic oil filter - Change or clean oil filter.
Hydraulic oil contamination - The oil must be changed.
Scored cylinder tube or rod - Change worn component.

Hydraulic pump is excessively noisy
Not enough oil or hydraulic system leaking - Repair hydraulic leaks or add oil as required.
Hydraulic filter is clogged - Service or replace hydraulic filter.
Plugged suction line - Clean suction line as required.
Air trapped in hydraulic pump - Need to bleed air.
Faulty pump components - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery will not charge
Loose or corroded wire connections - Service or tighten cable connections.
Battery terminal clamps are faulty - Terminal clamps need to be replaced.
Battery bad cell - Change the battery.
Loose or damaged belt - Adjust belt tension or change the belt.

Starter motor turns slow
Low battery output - Battery is drained, charge it.
Battery runs out quickly - Service or change the battery.
Disconnected wires or corroded battery terminals - Connect wiring correctly or install new terminals.

Starter doesn't crank
Battery is drained or defective - Battery needs to be recharged or replaced.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery output - Battery needs to be recharged.
Damaged starter motor - Starter should be replaced.