5.0 OPERATION
5.1 OIL LEVEL. Check the oil level of pump and add oil
if necessary (See Installation section, step 4.6).
5.2 VENTING PUMP. Make sure the pump reservoir is
vented (See Installation section, step 4.4).
5.3 TREADLE OPERATION. See illustration 8.
a) TO ADVANCE CYLINDER. Depress the
"PRESSURE" end of treadle and the pump will start to
pump hydraulic oil to the system.
b)TOHOLDTHECYLINDERPOSITION.Thepumpwill
stop and hold pressure when the treadle is in the
free/neutral position (treadle is not depressed in either
"PRESSURE" or "RELEASE" positions.)
c) TO RETRACT CYLINDER. Depress the "RELEASE"
end of the treadle to retract cylinder. To stop the cylinder
from retracting, release the treadle and return it to the
hold position.
NOTE: To prolong pump and cylinder life, DO NOT
continue to operate pump after cylinder is fully extended
or retracted.
5.4 PRIMING. Priming of the hydraulic pump is normally
not required. If, however, the pump is run completely out
of oil, it will be necessary to proceed with the following
steps:
a) If the 7004 pump is mounted vertically, remove and
place on horizontal surface.
b) Fill pump with hydraulic oil (see Installation, step 4.6).
c) Set air pressure to 30-40 psi [2-3 bar] max.
d) While holding treadle in the retract position, press air
button, located just above the air inlet swivel connector,
and run the pump momentarily several times.
e) To verify that the pump is primed, operate as normal
with cylinder attached. If cylinder does not advance,
repeat step 5.4 d
5.5 PRESSURE ADJUSTMENT. To obtain less than
maximumhydraulicpressure,eitherinstallanadjustable
relief valve in the system or limit the inlet air pressure.
When limiting the inlet air pressure, pump will slowdown
and stall as the hydraulic pressure increases. To obtain
a stall-out pressure, lower the inlet air pressure until the
pump stalls below the desired hydraulic pressure and
increaseairpressureuntilthedesiredhydraulicpressure
is reached. Repeat pump operation to verify the stall-out
pressure.
NOTE: These pumps were not designed for stall to
restart applications. The seals on the pump will not
ensure the pressure drop accuracy required foreffective
stall to restart operation.
6.0 MAINTENANCE
6.1 MAINTAINING PROPER OIL LEVEL. Check the oil
level of the pump prior to start-up, and add hydraulic oil,
if necessary, by removing the vent/fill plug (refer to
Installation section, step 4.6)
6.2CLEANINGTHEMUFFLER.Cleanthemufflerevery
250 hours, or more frequently if pump is used in dirty
environments. First remove 2 shoulder bolts (A) and
treadle (B). See Illustration 9. To expose the muffler,
remove 2 screws holding down muffler plate. Wash
muffler element in soapy water, dry, and reassemble,
installing screws hand tight.
6.3 CHANGING THE OIL. Change the oil every 250
hours. The vent/fill plug serves as a drain plug for use
in changing oil. Refill pump with hydraulic oil. Dispose of
used oil properly.
Illustration 8:
A
B
Illustration 9
RELEASE PRESSURE
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