During-operation maintenance is designed to correct problems encountered while the smoke
generator is operating. The procedures for performing during-operation maintenance are listed below.
Fog Oil. Check the supply drum and the reserve drum.
Engine Head. Inspect the head indexing slot and position of the valve. Inspect and service the head
assembly. Replace the head and engine valve as required.
Leaks. Check the generator for fuel and oil leaks.
Fuel Feed and Oil Flow. Adjust the flow of fuel and oil as required.
Performance. Listen for high- and low-speed engine noises, and check for overheating.
After-operation maintenance is performed to correct problems that could not be corrected while the
generator was operating. It also helps to prepare the generator for the next mission. The procedures for
performing after-operation maintenance are listed below.
Fog Oil System. Inspect the fog oil inlet and exhaust hoses for general condition. Failure to keep fog
oil hoses from contacting hot generator components will result in charring and rapid deterioration.
Inspect the fog oil sediment strainer and clean if necessary. Check the operation and the position of the
oil metering globe valve.
Fog Oil Pump Assembly. Inspect and tighten the fog oil line and the pressurizing line connections as
required. Inspect the general condition of the pump and the operation of the air motor drain cock.
Starting System. Inspect the air pump for operation and see that it is secure. Inspect the magneto and
the spark igniter, making certain the components are secure.
Frame Assembly. Inspect the frame and fittings for dents, cracks, and loose bolts. Clean and tighten as
required. Check the toolbox for tools, repair parts. and accessories to ascertain that they are present and
in good condition. Refer to TM 3-1040-276-10 to perform the inventory.
Cleaning the Equipment. Clean the engine head assembly. Replace the engine valve if necessary.
Clean the fog oil pump and all metal surfaces of the smoke generator. Clean hoses, drain, wipe dry, and
stow on the smoke generator. Replace the bung in the fog oil drums and tighten with a bung wrench.
For easy reference, the before-, during-, and after-operation checks and services have been
combined. Figure 9, an extract from TM 3-1040-276-10, shows the quick reference table. (Dots under
A, items 4, 6, and 7 have been added.)