Hitachi EX1900-5 Operator's Manual page 264

Problem
Engine Not Developing Full
Power
Engine Overheats
TROUBLESHOOTING
ENGINE
Cause
Air filters plugged
Fuel line restricted
Contaminated fuel
Fuel filters plugged
Plugged fuel tank breather
Injection nozzles dirty or
malfunctioning
Injection pump linkage adjustment
Wrong fuel
Wrong oil
Turbocharger failure
Exhaust restriction
Engine is too hot or cold
Engine failure
Valve clearance
Intake or exhaust system leakage
Low coolant level
Thermostat
Engine overloaded
Radiator cap faulty
Radiator core or oil cooler core
plugged
Fan damaged
Air cleaner plugged
Alternator belt loose
Pulley grooves worn
Cooling system passages dirty
Temperature gauge or sending unit See your authorized dealer.
11-4
Solution
Replace filter elements.
Repair or replace fuel line.
Drain fuel tank and clean outlet screen.
Refill.
Change filters.
Clean or install new breather.
See your authorized dealer.
See your authorized dealer.
Use correct fuel.
Use correct oil.
See your authorized dealer.
Remove muffler and run engine.
See below.
See your authorized dealer.
Check and adjust valves.
See your authorized dealer.
Add coolant.
See your authorized dealer.
Check hydraulic relief valves.
Install new cap.
Clean radiator and oil cooler.
Replace fan.
Clean air cleaner.
Tighten or install new belt.
Replace pulleys.
Flush cooling system.