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JCB JZ140 ZTS Troubleshooting Table

JCB JZ140 ZTS Maintenance Routine Maintenance Troubleshooting

To extend the service life and improve the operation of the machine, daily inspection and lubrication are necessary as well as immediately isolating any problem found and dealing with it. If the machine is operated with the problem uncorrected, it may lead to larger trouble and possibly to a big accident.

If trouble occurs, search for the cause in the items below and make adjustments, repairs, etc. as necessary. If the cause cannot be isolated, contact your JCB distributor. >>  JZ140 ZTS repair service manual

Table 1. Engine does not start

Cause Remedy
Defective starter switch Connect, repair connection
Defective rotation of starter (Starter rotates slowly) Discharged battery, starter problems, contaminated or loose wiring connection
Improper viscosity of engine oil Inspect and replace as necessary
Excessive cooling of engine (Cold weather) Preheat with air heater. Warm up the coolant (add hot water)
Possible seizure in engine Repair(1)
Incomplete air bleeding of fuel system Completely bleed air
No fuel in fuel tank Refill
Fuel quality unsuitable Inspect and replace as necessary
Fuel filter clogged Clean or replace
Low compression Repair(1)
Defective fuel injection pump Repair(1)

 Table 2. Engine stops during operation

Cause Remedy
No fuel in fuel tank Refill
Fuel filter clogged Clean and replace
Air is mixed in the fuel system Retighten fuel pipe connections and bleed system

 Table 3. Low oil pressure

Cause Remedy
Low oil Refill
Defective oil pressure switch Replace(1)
Oil filter clogged Replace element
Low oil viscosity Replace with oil of viscosity matching temperature
Improper operation of oil pump Replace parts(1)
Oil leakage at connections Tighten connections

 Table 4. Exhaust gas from engine is white or blue

Cause Remedy
Excessive oil consumption Disassemble and repair, replace parts
Excessively low oil viscosity Replace with correct oil
Excessive cooling by radiator Adjust
Improper fuel injection timing Adjust or replace if necessary
Low compression Disassemble and repair, replace parts

 Table 5. Exhaust gas from engine is black or dark grey

Cause Remedy
Improper fuel Replace with correct fuel
Improper valve clearance Adjust
Defective fuel injection pump Adjust or replace if necessary(
Low compression Disassemble and repair, replace parts
Insufficient air intake (air cleaner clogged) Clean or replace the element

 Table 6. Excessive fuel consumtion

Cause Remedy
Defective fuel injection pump Adjust or replace if necessary
Improper spray from fuel injection nozzle Adjust or replace if necessary
Improper fuel injection timing Adjust or replace if necessary
Improper fuel Replace with correct fuel
Low compression Disassemble and repair, replace parts
Insufficient air intake Clean or replace element

Table 7. Excessive engine oil consumtion

Cause Remedy
Excessive oil Drain oil to proper level
Low oil viscosity Replace with oil of viscosity matching temperature
Oil leakage Retighten and replace parts if necessary
Worn cylinder piston rings Disassemble and repair, replace parts

 Table 8. Abnormal noise (fuel or mechanical)

Cause Remedy
Bad fuel Replace
Damage inside muffler Replace

Table 9. Engine overheating (water temperature reads too high)

Cause Remedy
Low coolant Refill
Water leakage Repair
Elongated or oil dirtied belt Clean or replace
Defective radiator Repair or replace
Broken fan Replace
Incorrect mixture of anti-freeze solution Replace
Defective water pump or water sensor Replace
Defective thermostat Replace

Table 10. Engine overheating (water temperature reads too high)

Cause Remedy
Improper belt tension Adjust
Wiring trouble Repair
Defective battery Replace
Defective regulator Replace
Defective alternator Replace

Indicates jobs which should be done by specialist. Refer to JCB Engine Service Manual.

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