2
INSTALLATION INSTRUCTIONS
When the pump is in operation, the drive
shaft end and the coupling must be en-
closed by a protective cover or a coupling
bell.
Pressure in the discharge line and pump
must be at zero before any maintenance to
the pump takes place. Shut off suction line.
Disconnect fuses to ensure that the driving
motor does not get switched on accidently.
Make sure that all parts on the pressure
side of the unit are vented before starting
the pump. In order to prevent air, or an air-
water mixture being absorbed and to pre-
vent cavitation occurring, the pump NPSHR
(=suction head) and water temperature
must be respected.
Cavitation and/or compression of gases
lead to uncontrollable pressure-kicks
which can ruin pump and unit parts and
also be dangerous to the operator or
anyone standing nearby.
Giant Plunger Pumps are suitable for pump-
ing clean water and other non-aggressive or
non-abrasive media with a specific weight
similar to water.
Before pumping other liquids - especially
flammable, explosive and toxic media
- the pump manufacturer must be con-
sulted with regard to the resistance of
the pump material. It is the responsibil-
ity of the equipment manufacture and/
or operator to ensure that all pertinent
safety regulations are adhered to.
Required NPSH refers to water (specific weight
1kg/dm
3
) at maximum permissible pump revolu-
tions.
Operation and Maintenance
Check oil level prior to starting and ensure
trouble-free water supply.
Important!
If there is a
danger of frost
, the
water in the pump and in the pump fittings (par-
ticularly 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.
Oil: Use only 30.4 ounces (0.9 liters) of ISO VG
220 GL4 (e.g. Aral Degol BG220) or SAE 90
GL4 gear oil (Giant’s part number 01154).
Initial oil change after 50 operating hours and
then every 500 hours, after 1 year if used less.
Caution when operating in damp places or
with high temperature fluctuations. Oil must
be changed immediately should condensate
(frothy oil) occur in the gear box.
NPSH values must be observed.
Maximum input pressure 145 PSI (10 bar)
maximum suction head -4.35 PSI (-0.3 bar).
Make sure that suction pulsation is sufficiently
dampened - water column resonance must be
avoided.
Important!
If the pump is not used for a long
period of time, it is possible the seals (23/23B)
could become hard or brittle thus causing the
pump to leak when put into operation.
If this is the case, we recommend these seals
be replaced every 4 years.
Safety Rules
A safety valve is to be installed in accordance
with the guidelines for liquid spraying units so
that the admissible operating pressure can-
not be exceeded by more than 10%. Pump
operation without a safety valve as well as any
excess in temperature or speed limits automati-
cally voids the warranty.
