____________________________________________________________________________________
Home / Wheel Loaders / JCB Wheel Loaders / JCB 426 ZX |
JCB 426 ZX Troubleshooting
The
JCB 426 ZX wheel loader is powered by Cummins BTAA-5.9C 6-cylinder turbocharged
liquid-cooled diesel engine with a rated power of 142 hp (106 kW) at 2200 rpm.
The JCB 426 ZX is equipped with a 4-speed powershift transmission, hydraulic
power steering, hydraulic wet disc brakes, and 20.5R25 standard tires. The
hydraulic system has a piston pump with fluid flow rate of 34.8 gpm (132 lpm).
The hydraulic pressure is 3625 psi (250 bar). The wheel loader has a rated
operating capacity of 9570 lbs (4340 kg) and tipping load of 19140 lbs (8680
kg). The max lift height is 153.7 inches (3905 mm) to hinge pin, and boom
breakout force is 23830 lbs (10830 kg).
Engine Troubleshooting |
Engine hard to start or doesn't start
Air in fuel system - Bleed fuel system.
Dirty fuel filter - Replace filter element.
Faulty or dirty injection nozzles - Clean or change injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
Incorrect valve clearance - Correct valve clearance.
Fuel injection pump is not operating properly - Install a new pump or rebuild.
Engine starts but immediately stalls
Clogged air cleaner - Service or replace air cleaner.
Dirty fuel filter - Replace the filter element.
Fuel injection pump has loose connections - Tighten the connections.
Damaged or clogged injectors - Replace or clean fuel injectors.
Damaged fuel injection pump - Rebuild or install a new injection pump.
Engine stalls during operation
Low coolant temperature - Warm up engine as required.
Clogged fuel filter - Clean or replace the filter.
Air in the fuel lines - Bleed the fuel lines.
Faulty fuel injection nozzles - Replace injection nozzles.
Fuel injection pump timing is not adjusted - Adjust as recommended.
Engine shuts off while idling
Low idle speed setting is not correct - Correct the settings.
Fuel injection pump is not operating properly - Repair or install a new fuel pump.
Fuel injectors are dirty or defective - Replace or clean fuel injectors.
Valve clearance is out of adjustment - Check and adjust as required.
Diesel power loss
Air filter is clogged - Clean or change filter.
Defective injection nozzle - Check injection nozzles and replace if required.
Incorrect fuel injection pressure - Check the fuel injection pressure and adjust if necessary.
The valve clearance is not adjusted - Need to adjust valve clearance.
Too low idle RPM - Adjust low idle speed.
Clogged fuel hoses or lines - Fuel hoses and lines must be clean.
Cylinder-head gasket is leaking - Replace cylinder head gasket.
Defective or worn piston rings - Install new piston rings.
Engine overheating
Not enough coolant - Fill radiator to proper level and check components for faults.
Engine oil insufficient - Check and refill engine oil.
Dirty radiator core or faulty radiator cap - Clean radiator or change cap.
Broken or loose fan belt - The fan belt needs to be replaced.
Engine is under excessive load - Load reducing required.
Oil pressure is low
Low crankcase oil level - Add oil to the engine crankcase.
Dirty oil filter element - Replace or service engine oil filter.
Wrong oil viscosity - Use the specified type of engine oil.
Incorrect crankshaft bearing oil clearance - Bearings need to be reinstalled.
Oil pump failure - Inspect and change as required.
Engine noises or knocks
Engine oil level is insufficient - Fill the crankcase with engine oil.
Engine is not fully warmed up - Warm up to required temperature.
Fuel injection pump timing is wrong - Set it up as required.
Low idle speed setting is not correct - Adjustment required.
Fuel injector fault - Clean fuel injectors or change it.
Misaligned or faulty connecting rod - Alignment procedure or replacement is required.
Broken or worn pistons - Pistons replacement required.
Transmission Troubleshooting |
Lack of transmission oil pressure
Transmission fluid insufficient - Check and refill the transmission fluid.
Transmission fluid filter element is clogged (if equipped) - Replace or service transmission fluid filter.
Relief valve malfunction - Install a new valve.
Transmission noises
Transmission fluid insufficient - Need to add transmission fluid.
Transmission oil is dirty - Change the oil.
Defective gears or improper backlash - Change worn gears or adjust backlash correctly.
Bearings are cracked or worn - Change the bearings.
Damaged or worn gear shift forks - Shift forks need to be replaced.
Shaft splines are worn or stuck - Shaft need to be replaced.
Gear hard to shift
Corroded or worn gear shift linkage - Shift linkage need to be replaced.
Shift forks are bent or worn out - Replace defective shift forks.
Worn out parts of the gearshift mechanism - Replace worn parts.
Clutch is worn or not adjusted - Adjust or change the clutch.
External oil leaks
Transmission fluid level is high - Correct the fluid level.
Seals or gaskets are broken - Replace worn gaskets or seal.
Hydraulics Troubleshooting |
Hydraulic system is overheated
Hydraulic pressure is not adjusted correctly - Adjust pressure as required.
Faulty or improperly adjusted main relief valve - Adjust relief valve or change if required.
Hydraulic oil is contaminated - Change hydraulic oil.
Hydraulic fluid level is insufficient - Add fluid to the hydraulic system.
Faulty hydraulic oil pump - Replace or repair pump if necessary.
Boom fails to lift or drop
Defective lift controls - Change or repair.
Defective hydraulic pump - Change or repair hydraulic pump if required.
Faulty hydraulic control valve - Repair or change hydraulic valve.
Hydraulic cylinder is defective - Repair or change hydraulic cylinder.
Low hydraulic fluid level - Fill the system to proper hydraulic fluid level.
Bucket can't tilt
Bucket tilt controls are defective - Inspect and repair if necessary.
Hydraulic pump not working - Replace or repair pump if necessary.
Hydraulic control valve failure - Install a new valve or repair it.
Hydraulic bucket cylinder is defective - Repair or change cylinder.
Hydraulic oil is insufficient - Checking hydraulic oil level and add if necessary.
Slow boom or bucket action
Hydraulic pump is faulty - Check the pump capacity and replace pump if required.
Hydraulic cylinder oil leakage - Change cylinder piston seals.
Insufficient hydraulic fluid - Fill up the hydraulic fluid.
Worn or unadjusted hydraulic control valve - Set properly or repair.
Low hydraulic pressure - Adjust pressure as required.
Jerky operation of the bucket or boom
There is air in the hydraulic system - Air bleeding is required.
Hydraulic oil filter is clogged - Clean or install new filter.
Dirty hydraulic fluid - Fill up with fresh hydraulic fluid.
Scored cylinder tube or rod - Replace failed component.
Hydraulic pump makes excessive noise
Hydraulic system leaking or not enough oil - Refill hydraulic oil or repair leaks in system.
Clogged hydraulic filter - Replace or clean the filter.
Clogged suction line - Need to clean the suction line.
Air trapped in hydraulic pump - Remove air from hydraulics.
Pump components are worn out - Rebuild or change hydraulic pump.
Electrical Troubleshooting |
Battery does not charge
Loose or corroded electrical wiring connections - Clean or tighten wiring connections.
Battery terminal clamps are faulty - Install new terminal clamps.
Battery is worn - Replace the battery.
Loose or worn belt - Need to adjust belt tension or replace belt.
Starter turning slow
Battery power is low - Recharge the battery.
Battery does not hold charge - Service or change the battery.
Bad battery terminals or disconnected wiring - Check battery wires and service or replace terminals.
Starter does not work
Battery is drained or defective - Change or recharge battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery power - Low battery charging, charge as required.
Starter motor is defective - Change or repair starter.
____________________________________________________________________________________
____________________________________________________________________________________
WHEEL LOADERS SPECIFICATIONS |
Bobcat
Caterpillar
Case
Doosan
John Deere
Kubota