2
INSTALLATION INSTRUCTIONS
NOTE: Contact Giant Industries for Service School Information. Phone: (419)-531-4600.
Operation and Maintenance
Check oil level prior to starting and ensure trouble-free
water supply.
Oil:
Use only 1.6 gallons (6.0 liters) of SAE 80W-90
Industrial Gear Lube Oil (Giant’s p/n 01154). Initial
change after 50 hours and then after every 500
operating hours. If used less than this, change once per
year.
IMPORTANT!
When operating in humid areas (or areas
with large temperature fluctuations, the oil must be
changed immediately (if condensate or frothy oil occurs
in the crankcase).
I
MPORTANT!
We recommend that both inlet ports be
used in order to ensure cavitation-free operation and
optimal suction conditions. If only one connection is
use, a safety margin of 3 feet (1 meter) has to be added
to the required NPSH.
IMPORTANT!
If the pump is mounted on a vehicle with
the possibility of unlevelness and/or the pump speed is
between 300 & 500 RPM, the volume of oil should be
1.93 gallons (7.3 liters). To check, put the oil dipstick in
the bore situated next to the eye bolt.
IMPORTANT!
The GP7645GB, GP7650GB and
GP7655GB pumps have a black arrow on the reduction
gear, which shows the preferred direction of rotation.
The pump can be delivered either with the gear on the
left side or right side (when facing the front of the pump),
which eases planning assembled units with regard to the
desired direction or rotation.
In either case, the larger
gear wheel must rotate towards the front-end of the
pump.
The preferred/optimal direction of rotation ensures that
the oil is correctly splashed on the crosshead guides via
the motion of the connecting rods, which is a particular
advantage where continuous operation is involved.
The pump can also be run against the recommended
direction of the rotation if operated periodically or at
reduced pressure. If this is the case, the pump has to
be run in this direction to smoothen the bearing areas.
This is done by a one-time operation at zero pressure
for at least 30 minutes; thereafter, the pressure must
be slowly increased over the next hour to the desired
maximum operating pressure. This should run-in the
pump, but you should also check the oil temperature,
which should not exceed 160
o
F (71
o
C).
The torque tension on the valve casing nuts (49A) is to be
checked after approximately 200 hours. Please see page
6 for torque values.
IMPORTANT!
The service life of the seals is maximized
if a minimal amount of leakage is present. A few drops of
water can drip from each plunger every minute. Leakage
has to be examine every day. If the leakage becomes
excessive (constant dripping), the plunger seals must be
changed.
Safety Rules
The operating instructions must be read and adhered
to before performing any work on the pump or
complete assembled unit. No responsibility will be
carried by us for damage to materials or persons
caused by improper handling of our pumps
.
Access to the pump is not allowed by unauthorized
personnel. As safety valve is to be installed in accordance
with the guidelines for liquid spraying units, so that the
admissible operating pressure cannot be exceeded by
more than 10%. Pumps operating without a safety valve
as well as any excess in temperature or speed limits
automatically voids the warranty. When the pump is in
operating, the exposed shaft side, the driven shaft side and
its coupling must be covered by a protective guard. The
plunger area must also be covered by the protective plate
(30). Do not step onto the protective plate (30 ) or put
weight on it.
Before carrying out any maintenance work to the pump or
pump unit, the pressure in the discharge line and pump
must be at zero. Close off the suction line. Disconnect
fuses to ensure that the driving motor cannot accidently
get switched on. Before starting the pump, make sure that
the pump, the cooling system and all parts on the pressure
side of the unit are vented and refilled with pressure at
zero.
In order to prevent air or air/water-mixture being absorbed
and cavitation occurring, the pump NPSHR (Net Positive
Suction Head Required) and water temperature must be
adhered to.
Cavitation and/or compression of gases lead to
uncontrollable pressure kicks, which can ruin the
pump and unit parts and also be dangerous to the
operator or anyone standing nearby.
Giant plunger pumps are only suitable for pumping fresh
clean water.
Summary of Contents for GP7522GB
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