A
llied
AutoLube III
SECTION 5.0
THEORY OF OPERATION
The AutoLube III is used on a hydraulic
hammer to lubricate the wear bushings
and demolition tool automatically every
time the hammer is started.
Each time the hammer is activated, the
pressure from the carrier’s hydraulic sys-
tem activates the pump; the pump makes
one stroke to dispense grease. When the
hammer is stopped, the hydraulic pressure
to the pump drops below 200 psi (14 bar)
and the internal springs (see Figure 5-1) re-
turn the pump plunger to the initial posi-
tion for the next lube cycle. For proper
operation on older HyRams, the inlet hy-
draulic back pressure is higher than 200 psi
(14bar), a pressure relief valve must be in-
stalled.)
When the hammer is activated, grease
flows to the pump and the plunger opens
the grease inlet port. Grease is drawn into
the pump head by the vacuum in the head.
This vacuum and the pressure of the car-
tridge follower spring force the grease into
the lubricant pump line. Refer to Figure
5-2. When the hammer
is stopped, the
plunger and the follower spring return to
their initial positions. This process is re-
peated every time the hammer is started
and stopped.
8
11/11/02
SPRING
RETAINER
PLUNGER
O-RING
SPRING
SPRING
SPRING
Figure 5-1. Plunger and Internal Springs
FOLLOWER
SPRING
ROD
Figure 5-2. Follower Spring and Rod
