Duff-Norton RAM-PAC - Page 8

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Always replace the
dust covers on the half
couplings when the ram is
disconnected from
the
hose. (The ram -half coupling dust cover
is
the metal unit that is attached by
a small
chain; the hose -half
coupling dust cover is the
plastic
cap.)
Always pump
a slight amount of
oil through
the hose before
connecting it to a ram (see
Point 5 under
Operating
Instructions) and
remove all
foreign matter from
the connecting
threads before connecting units.
If pump will not
operate after having
been on
the shelf for some
time, it may have a
sticking
suction ball due
to the
residual magnetism
which
could have built up
while the pump
was
in
storage. A light hammer tap
on the pump
body, with
the pump in an inverted
position,
will
reorient the ball on its seat and
thus free
the
suction valve. Operate the lever with the
pump in an inverted
position until pump be-
comes primed.
Do not
unscrew the bleeder screw all
the way
out of the pump body. If this
is done, the
bleeder screw ball may be lost when
the oil
squirts out. If the
bleeder screw ball is not
in
place, the pump cannot
possibly
raise or hold
a load.
After the
bleeder screw has
been opened
two
or
three full
turns, no
amount of
additional
turning
of the
bleeder screw
knob will speed
up
the ram
retraction. The
ram
retraction
speed under
"no load"
conditions
depends en-
tirely on
the spring
force of
the
retraction
spring for
spring
returned rams
and, as the
spring
approaches
its closed
height position,
the
retraction
force is quite
low so that
the
retraction
speed is
correspondingly slow.
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Do not use the hydraulic
hose as a carrying
handle. If the ram is lifted and
carried by its
hose, the threaded connection can be
severely
strained and can cause oil leakage
at the pipe
thread.
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The
RAM -PAC units are suitable for temper-
atures between 20°F. and 140 0 F. For higher
or lower temperatures, the Duff -Norton En-
gineering
Department should be
consulted.
Avoid jamming the ram in
its fully extended
position. The underside of the gland nut gives
a mechanical stop which is suitable for emer-
gency stops but it should not be used repeated-
ly
as a stop.
Hydraulic gages
should not be left in
a hy-
draulic
circuit for a
prolonged period of
time
under pulsating loads due
to possible damage
and loss of gage
accuracy.
If the RAM
-PAC units are
used properly,
they will
give long service at a
remarkably
high degree of
efficiency. Reasonable care
must be
taken to keep the
rams and pumps
clean. This is especially
true of the ram
and
the
pump plunger for if they become
covered
with dirt and grime, some
of it will gradually
get mixed in with the oil
and will cause rapid
wear of the packing
and will, in time, score
the
cylinder walls.
When the RAM -PAC units
are not in use,
the rams
should be stored in the fully retract-
ed position. They should also be stored in a
reasonably clean and dry location and
should
not be subjected to excessively
high or low
temperatures.
Always use
DUFF -NORTON
HYDRAULIC
JACK OIL for the RAM
-PAC units. This oil
has been carefully selected for its
viscosity,
lubricity and
compatibility with the
packing
in the RAM
-PAC unit.
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At least
once a year, the
oil should be
drained
and the
units fl ushed with a
cleaning solvent.
After fl ushing
and draining,
refill the unit
with
clean DUFF
-NORTON
HYDRAULIC
JACK
OIL.
(,)