Lesson 1/Learning Event 2
LEARNING EVENT 2:
DESCRIBE SERVICES REQUIRED FOR
PLACING THE APPARATUS INTO OPERATION
The most important and most often overlooked aspect of servicing is
lubrication. Lubricating the M12A1 PDDA must be done at specific intervals.
Lubrication cannot be done as a half-hearted attempt to fulfill a
The specified lubricant, in the right mount, applied at the
correct location, is necessary for proper servicing. Applying lubricant in
the correct amount is an important part of this concern.
amount of lubricant will likely lead to early component failure.
other hand, too much lubricant (especially in areas of non-vented bearings
and seals), will cause excessive pressure to build, creating binding and
early component failure.
The only sure means of correctly lubricating the M12A1 PDDA is to use the
appropriate lubrication orders.
A lubrication order (LO) is a pictorial
diagram displaying the equipment to be lubricated, exact lubrication points,
which lubricant to use, and at what interval this service must be performed.
The M12A1 PDDA uses two lubrication orders. LO-3-4240-209-12 applies to the
M12A1 PDDA and LO-5-2805-259-12 applies specifically to the gasoline engine.
LO-3-4230-209-12 (figure 6 on pages 11 and 12) shows the intervals of
lubrication as daily, weekly, and monthly. These intervals may be lessened
based on special conditions.
These conditions are abnormal operation,
severe operating conditions, or when lubricants are found to be contaminated
Additionally, during long periods of inactivity (such as storage),
lubrication intervals may be extended as long as adequate preservation is
Fueling Procedures for the M12A1 PDDA
The M12A1 PDDA has two separate fuel requirements.
Fuel is used by the
Procedures for fueling both
components are described below.
Fueling the Gasoline Engine.
by the following method.
Step 1. Wipe off the dirt around the filter-pipe opening and the fuel-tank
cap. Remove the cap by slowly turning it counterclockwise until a stop is
felt. Then press down on the cap to allow the prongs on the cap-pressure
plate to pass under the projections on the filler-pipe neck ramp.