Learning Event 2
CHECK OPERATOR MAINTENANCE ON THE M3A4 SMOKE GENERATOR
Operator maintenance is a series of checks and services to be performed by the operator to correct
problems before they happen. Their main purpose is to help ensure the continuous operation of the
smoke generator. These procedures are classified into three separate events; before-, during-, and after-
Before-operation operator maintenance is a series of checks and services to be performed prior to
starting the smoke generator. These procedures are described below and listed in the order that the
operator will use them.
Fuel. Check the fuel supply in the fuel tank and fill if necessary.
Fuel System. Open the fuel drain cock on the bottom of the fuel tank and drain any water. Disconnect
the flexible tube at the engine head and drain any water from the float bowl by opening the float bowl
toggle valve. Adjust the float bowl if necessary.
Fog Oil. Check the supply drum and the reserve drum.
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.
Engine Head. Inspect the head indexing slot and valve position. Inspect and service the head assembly.
Replace the head and engine valve as required.
Outer Discharge Baffle. Inspect the outer discharge baffle for general condition. Service by tightening
the screws and cleaning as required.
Front Cover Assembly. Inspect the front cover for general condition, including the hinge and pin.
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 fitting 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.
Leaks. Check the generator for fuel and oil leaks.