TM 5-3825-226-24
4. SUDDEN CHANGES IN ENGINE RPM
Cause
Correction
Air In The Fuel System
Find the air leak in the fuel system and correct it. Loosen each
fuel line nut at the 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
Install new parts as needed.
Sleeve Control Shaft
Linkage In Governor Does
Clean all linkage and inside of governor housing. Install new
Not Move Freely
parts for those parts that have damage.
Governor Springs Not
Put springs completely on spring seat.
Completely on Spring Seat
Spring for Dashpot
Install spring correctly.
Governor Installed Wrong
5. NOT ENOUGH POWER
Cause
Correction
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
(205 ± 35 kPa).
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.
Air In The Fuel System
Find the air leak in the fuel system and correct it. Loosen each
fuel line nut at the 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.
Air Inlet Has A
Check air inlet pipes and air cleaner for restrictions.
Restriction
Wrong Fuel Setting
Make adjustments as necessary.
Governor Linkage
Make adjustment to get full travel of linkage. Install new parts
for those that have damage or defects.
Defect in Timing
Replacement of timing advance unit is needed.
Advance Unit
2-26
