Operation and Maintenance, Safety Rules | Giant GP7145GB, GP7255AGB

INSTALLATION INSTRUCTIONS

Operation and Maintenance

Check oil level prior to starting and ensure trouble-free water supply.

Oil: Use only 2 gallons (7.5 liters) if ISO VG-220 synthetic gear oil. Initial change after 50 hours and then after every 200 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 gear box).

IMPORTANT! 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! The GP7145GB and GP7255GB 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 oC).

The torque tension on the valve casing nuts (49A) is to be checked after approximately 200 hours. Please see page 7 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 person- nel. 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 uncon- trollable 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 suitable for pumping clean water and other non-aggressive or non abrasive media, which have a specific weight similar to water.

Before pumping other liquids (in particular, flammable, explosive and toxic media), the pump manufacturer must be consulted with regard to the resistance of the pump

NOTE: Contact Giant Industries for Service School Information.

Phone: (419)-531-4600.

GP7255AGB, GP7145GB specifications

The Giant GP7255AGB and GP7145GB are two notable models in the Giant range of bicycles, specifically designed for performance and versatility in varied riding conditions. These models reflect the brand's commitment to quality engineering and innovative technology, appealing to both casual riders and serious cyclists.

The GP7255AGB is characterized by its robust yet lightweight aluminum frame, which offers a perfect balance between durability and agility. This model features an advanced suspension system designed to absorb shocks and provide a smooth riding experience on uneven terrains. One of the standout features is its adjustable rear shock, allowing riders to customize the compression settings based on their preferences and the riding environment. With a wide range of gears, the GP7255AGB makes climbing steep hills effortless while ensuring quick gear transitions on flat stretches.

In addition to its performance-oriented design, the GP7255AGB is equipped with high-traction tires that enhance grip on various surfaces, ensuring stability and control during rides. The bike also incorporates reflective elements for improved visibility, making it a great choice for nighttime or low-light commutes.

On the other hand, the GP7145GB model signifies a fusion of style and functionality. With a sleek frame design and integrated components, this model prioritizes aerodynamics without sacrificing comfort. It features a lightweight carbon fork that reduces weight and increases response time during rides, making it ideal for road cycling enthusiasts.

The GP7145GB boasts a performance-enhanced gearing system, allowing for a wide gear range that caters to both intense climbs and fast descents. The bike is equipped with premium disc brakes for consistent stopping power, regardless of weather conditions. The ergonomic handlebar design also plays a critical role in rider comfort, allowing for longer rides without fatigue.

Both models utilize advanced technologies such as internal cable routing and a precise gearing system that offer a clean look and ensure low maintenance. The inclusion of a modern digital display on selected models provides riders with vital statistics such as speed, distance, and battery life for e-bikes, enhancing the overall riding experience.

In summary, the Giant GP7255AGB and GP7145GB represent the pinnacle of bicycle engineering, combining innovative features, advanced technology, and user-centric design to cater to diverse cycling needs. Whether navigating rugged trails or smooth urban streets, these models stand out as excellent choices for cyclists seeking performance and reliability.