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 TROUBLESHOOTING
TESTING AND ADJUSTMENT
Problem
Cause
Correction
4. SUDDEN CHANGES IN
Air In The Fuel System
Find the air leak in the fuel system and correct it. Loosen each fuel line nut at the
ENGINE RPM
injection pumps and open the manual bleed valve. Loosen the bolts that hold the
torque spring or stop bar cover. This will let out any air that is in the governor
housing. After all air is out of fuel system, tighten bolts that hold torque spring or
stop bar cover. Tighten fuel line nuts according to the SPECIFICATIONS. Close
manual bleed valve.
Broken Torsion Spring on Sleeve
Install new parts as needed.
Control Shaft
Linkage In Governor Does Not
Clean all linkage and inside of governor housing. Install new parts for those parts
Move Freely
that have damage
Governor Springs Not Completely
Put springs completely on spring seat.
on Spring Seat
Spring for Dashpot Governor
Install spring correctly.
Installed Wrong
5.
NOT ENOUGH POWER
Bad Quality Fuel
Remove the fuel from the fuel tank. Install a new fuel filter element. Put a good
grade of clean fuel in the fuel tank.
Fuel Pressure is Low
Make sure there is fuel in the fuel tank. Look for leaks or bad bends in the fuel line
between fuel tank and fuel transfer pump. Look for air in the fuel system. Check
fuel pressure. The outlet pressure of the fuel transfer pump at full load speed is 30
5 psi (2.1 0.4 kg/cm2 ).
If fuel pressure is lower than above pressure, install a new fuel filter element.
Inspect the fuel bypass valve for free movement. Install a new fuel bypass valve if
necessary.
Find the air leak in the fuel system and correct it. Loosen each fuel line nut at the
Air In The Fuel System
injection pumps and open the manual bleed valve. Loosen the bolts that hold the
torque spring or stop bar cover. This will let out any air that is in the governor
housing. After all air is out of fuel system, tighten bolts that hold torque spring or
stop bar cover. Tighten fuel line nuts according to the SPECIFICATIONS. Close
manual bleed valve.
Leaks in Air Inlet System
Check the pressure in the air intake manifold. Look for restrictions in the air cleaner.
Wrong Fuel Setting
Make adjustments as necessary.
35
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