Komatsu 830E-AC Shop Manual page 1034

P3-10
INJECTOR OPERATION
STAGE 1.
The injector piston (2) is in its normal
or "rest" position. The discharge
chamber (3) is filled with lubricant from
the previous cycle. Under the pressure
of incoming lubricant (6), the slide
valve (5) is about to open the passage
(4) leading to the measuring chamber
(1) above the injector piston (2).
STAGE 2.
When the slide valve (5) uncovers the
passage (4), lubricant (6) is admitted
to the measuring chamber (1) above
the injector piston (2) which forces lu-
bricant from the discharge chamber
(3) through the outlet port (7) to the
bearing.
STAGE 3.
As the injector piston (2) completes its
stroke, it pushes the slide valve (5)
past the passage (4), cutting off further
admission of lubricant (6) to the pas-
sage (4) and measuring chamber (1).
The injector piston (2) and slide valve
(5) remain in this position until lubri-
cant pressure in the supply line (6) is
vented.
STAGE 4.
After venting, the injector spring ex-
pands, causing the slide valve (5) to
move, so that the passage (4) and
discharge chamber (3) are connected
by a valve port (8). Further expansion
of the spring causes the piston to
move upward, forcing the lubricant in
the measuring chamber (1) through
the passage (4) and valve port (8) to
refill the discharge chamber (3).
Injector is now ready for the next
cycle.
Automatic Lubrication System P03030