Giant P435, Operating Instructions/ Repair And Service Manual

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recommended by Giant Industries, Inc. to further re-
duce system pulsation. Dampeners can also reduce
the severity of pressure spikes that occur in systems
using a shut-off gun. A dampener must be positioned
downstream from the unloader.
5. Crankshaft rotation on Giant Industries, Inc. pumps
should be made in the direction designated by the
arrows on the pump crankcase. Reverse rotation
may be safely achieved by following a few guidelines
available upon request from Giant Industries, Inc.
Required horsepower for system operation can be
obtained from the charts on pages 3-5 and page 8.
6. Before beginning operation of your pumping
system, remember: Check that the crankcase and
seal areas have been properly lubricated per recom-
mended schedules. Do not run the pump dry for ex-
tended periods of time. Cavitation will result in severe
damage. Always remember to check that all plumbing
valves are open and that pumped media can flow
freely to the inlet of the pump.
7. IMPORTANT! If there is a danger of frost , the
water in the pump and the pump fittings (particularly
the unloader valve) must be emptied. The second
discharge port can also be used and the pump run
“dry” for 1-2 minutes for this purpose.
8. IMPORTANT! If the pump is not used for a long
period of time, it is possible the seals (23) could
become hard or brittle thus causing the pump to leak
when put into operation. If this is the case, we recom-
mend these seals be replaced every 4 years.
INSTALLATION INSTRUCTIONS
Installation of the Giant Industries, Inc., pump is not
a complicated procedure, but there are some basic
steps common to all pumps. The following infor-
mation is to be considered as a general outline for
installation. If you have unique requirements, please
contact Giant Industries, Inc. or your local distributor
for assistance.
1. The pump should be installed flat on a base to a
maximum of a 15 degree angle of inclination to ensure
optimum lubrication.
2. The inlet to the pump should be sized for the flow rate
of the pump with no unnecessary restrictions that can
cause cavitation. Teflon tape should be used to seal all
joints. If pumps are to be operated at temperatures in ex-
cess of 160 °F (70 °C), it is important to insure a positive
head to the pump to prevent cavitation. The maximum
input pressure is 145 PSI (10 bar). The maximum suction
head is -4.35 PSI (-0.3 bar). Make sure that suction pul -
sation is sufficiently dampened - water column resonance
must be avoided.
3. The discharge plumbing from the pump should be
properly sized to the flow rate to prevent line pressure loss
to the work area. It is essential to provide a safety bypass
valve between the pump and the work area to protect the
pump from pressure spikes in the event of a blockage or
the use of a shut-off gun.
4. Use of a dampener is necessary to minimize
pulsation at drive elements, plumbing, connections,
and other system areas. The use of a dampener with
Giant Industries, Inc. pumps is optional, although
Finally, remember that high pressure operation in a pump system has many advantages. But, if it is
used carelessly and without regard to its potential hazard, it can cause serious injury.
IMPORTANT OPERATING CONDITIONS
Failure to comply with any of these conditions invali-
dates the warranty.
1. Prior to initial operation, add oil to the crankcase so
that oil level is between the two lines on the oil dipstick.
DO NOT OVERFILL.
Use SAE 80-90W or Giant’s p/n 01154 or ISO
VG220 industrial gear lube oil
Crankcase oil should be changed after the first 50
hours of operation, then at regular intervals of 500 hours
or less depending on operating conditions.
2. Pump operation must not exceed rated pressure, volume,
or RPM. A pressure relief device must be installed in the
discharge of the system.
3. Acids, alkalines, or abrasive fluids cannot be pumped
unless approval in writing is obtained before operation from
Giant Industries, Inc.
4. Run the pump dry approximately 10 seconds to drain the
water before exposure to freezing temperatures.