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Form No. R32.00 Rev. 4/99
For any system and combination of piping except High
Water Based Fluids (HWBF), the vacuum at the pump
inlet must not exceed seven inches of Mercury, (5 inch
Hg. for fire resistant fluids). HWBF Pumps are to have
a positive inlet head in the range of 0.5-inch Hg. to 20
inch Hg.
Piping should be done with pickled pipe or seamless
tubing free of dirt and scale. Do not use galvanized or
other pipe that tends to flake off.
A 100-mesh screen (60 mesh for fire resistant and
HWBF) should be used on the pump suction line. The
screen should be located approximately two inches
from the bottom of the tank. All lines returning oil to the
tank should discharge at least two inches below the
minimum oil level and should be separated from the
pump suction area by means of a baffle. These lines
should also include a 10-micron return line filter, with
the exception of the case drain line.
The pump case drain should be connected directly to
the tank. Pressure in excess of 10 psi in the case
drain line can result in shaft seal leakage. It is recom-
mended that the case drain be returned to the tank by
a separate 3/8-inch line.
STARTUP PROCEDURES
The following instructions apply for initial startup of the
hydraulic pump. After an extended shutdown period,
start with item 5.
CAUTION -
Never start a new pump installa-
tion against a blocked system.
1. Check the nameplate for model number and rpm.
The arrow on the pump casting indicates direction
of rotation.
2. Pump suction line should extend below the lowest
point of oil level but not less than two inches above
reservoir bottom.
3. The pump and motor shafts must be aligned within
.003 inches. (See Pump Drive and Mounting
directions above for restrictions).
4. Connect the case drain directly to tank (or to a heat
exchanger if the pump will be deadheading for long
periods of time during operation), using a full-size
line corresponding to the case drain in the pump or
manifold. If connected to a heat exchanger, the
case drain line should be protected with a 10 psi.
maximum relief valve in parallel with the heat
exchanger. No other return lines should be con-
nected in common with the case drain return.
5. Rotate pump and motor by hand to insure free
rotation.
6. Set the machine controls to open the circuit and
allow free flow from the pump back to tank or
connect the pump outlet line directly to tank. Jog
the motor on and off several times (on, two sec-
onds, off three seconds) until the pump is primed.
Check pump for proper direction of rotation during
the jogging.
7. After the pump has been primed, run it for several
minutes at lower than normal pressures with an
open or intermittently open system which permits
oil flow. This will purge entrapped air from the
pump and system.
8. Neither volume adjustment nor pressure adjustment
should be adjusted until the pump has been primed
and running, and air is purged.
9. After air has been purged from the system, the
system can be closed and the pump adjusted to the
required operating pressure.
10. If necessary, the volume adjustment can be
adjusted to the required operating pressure.
11. When replacing pumps, the suction screen in the
reservoir must be removed and thoroughly cleaned.
Also, the suction line from the reservoir to the pump
should be flushed inside and out to remove any
contaminants. Pieces of metal from a damaged
pump can back up into this line. If they are not
removed, they will be drawn into the new pump and
destroy it. Start unit by using proper pump start-up
procedure items 1 through 10.
CAUTION -
If both pressure and volume
modifications are supplied on the pump, the
pressure should be adjusted before the
volume. Volume should be adjusted at minimum pump
pressure or at deadhead. Stop adjustment at the
volume screw when pressure begins to drop.
OPERATION
PRESSURE AND VOLUME ADJUSTMENTS
Pressure Control
All pumps (except those with special volume or pres-
sure requirements) are adjusted to reduced pressure
before shipment and must be readjusted to the re-
quired system pressure after installation and start-up.
The pressure adjusting screw is located at the end face
of the compensator chamber. See parts page item
number 30. The adjusting screw has a right hand
thread; clockwise adjustment increases pressure;
counterclockwise reduces pressure.
