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4-30
Troubleshooting
Fault
Causes
Solutions
1. The engine
cannot or is
difficult to start
• Faulty starter motor
• Replace or repair the starter motor
• Insufficiently charged battery
• Charge or replace a new battery
• Improper use of preheating lines
or plugs
• Repair or replace the preheating
plug
• Abnormal injection timing
• Check the injection timing
• Oil pipeline blockage
• Clean the oil line
• The fuel filter is blocked
• Clean or replace the fuel filter
• Water, dust, or air in the fuel
system
• Purge the air and clean the oil line
• Dirty fuel injector or low fuel
injection pressure
• Have it repaired by the local repair
point
• Malfunction of the fuel injection
pump
• Consult with dealers of the
manufacturer
• Insufficient fuel
• Refill the oil
• Blocked intake and exhaust
system
• Smoothen the intake and exhaust
system
2. Engine
knocking,
irregular
operation, or
shutdown
• Massive gas release
• Consult with dealers of the
manufacturer
• The fuel filter is blocked
• Clean the oil filter
• Dirt or air in the fuel system
• Purge the air and clean the oil line
• Oil filter clogged, dirty or faulty
nozzle
• Have it repaired by the local repair
point
• High pressure oil pipe damage Replace the high pressure oil pipe
• Insufficient fuel
• Refill the oil
• Governor connection cannot be
adjusted
• Consult with dealers of the
manufacturer
• Failure of fuel spray pump
• Consult with dealers of the
manufacturer
• Incorrect fuel injection timing or
stuck fuel injection nozzle
• Check the injection timing and oil
nozzle
3. Engine power
drop
• Air in the fuel
• Exhaust the air
• Oil supply is not smooth
• Check and clean
• Change of injection timing
• Adjust according to the specified
value
• Poor operation of fuel injector
• Check the working pressure and
spray atomization
• Air filter blocked
• Clean the filter.
• Incorrect clearance between
intake and exhaust valves or
unsealed valves
• Adjust the valve clearance
• Damaged or leaking cylinder
gasket
• Replace the cylinder gasket
• Poor operation of fuel injection
pump
• Consult with dealers of the
manufacturer
• Overheated engine
•Check if the coolant used is correct.
If there is any looseness in the water
pump and belt, it should be repaired
or replaced, and the blockage in the
water channel should be removed
Summary of Contents for U35
Page 5: ...1 1 1 Preface...
Page 15: ...2 1 2 Safety regulations...
Page 45: ...3 1 3 Introduction of components...
Page 70: ...4 1 4 Operation guide...
Page 90: ...4 21 6 After the engine shuts down reset the shutdown lever...
Page 104: ...5 1 5 Maintenance...
Page 147: ...6 1 6 Accessories guide...