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 HYDRAMECHANICAL PROTECTIVE SYSTEM
TROUBLESHOOTING
3. ENGINE WILL ONLY RUN BELOW 70% OF RATED SPEED
Cause
Correction
Engine Oil Pressure Is Not High
Check engine oil pressure in oil line (2), see Figure 1. A minimum of 240 kPa
Enough In The High Speed
(35 psi) is required in high speed range. Clean the engine oil pressure line to
Range
the shutoff control group, if needed. Also, engine repair may be needed.
4. AIR INLET SHUTOFF ACTIVATES ON LOAD REJECTION
Cause
Correction
Governor Overshoot Lets Engine
Correct governor overshoot. If this can not be done, increase over- speed
Speed Exceed Overspeed Setting
setting to a maximum of 25% of rated speed.
5. AIR INLET DOES NOT CLOSE
Cause
Correction
Tube Fittings At Hydraulic Actuator
Turn fittings out until cylinder rod is free to move.
Are Installed Too Far. The End Of
The Fitting Is Binding The Cylinder
Rod
Air Inlet Valve Shaft Sticking Or
Check for corrosion on shaft bearing surfaces or improper alignment.
Binding
6. ENGINE WILL NOT RESTART AFTER OPERATION OF EMERGENCY MANUAL SHUTOFF
Cause
Correction
The 5N5880 Remote Emergency
Check for binding of 5N5878 valve in the valve bore.
Manual Shutoff Did Not Fully
Return To The Run Position When
Switch Or Valve Was Released
Fuel Shutoff Actuator Stuck In The
Remove the actuator. Check surface finish of bore and polish, if necessary.
Shutoff Position
Put a small amount of clean oil in the bore and on the seal. Move the rod and
piston in the actuator cylinder to check for free movement. Replace actuator, if
necessary.
Air Inlet Valve Shaft Sticking Or
Check for corrosion on shaft bearing surfaces or improper alignment.
Binding
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