PUMP SYSTEM MALFUNCTIONS

MALFUNCTION

CAUSE

REMEDY

The Pressure and/

Worn packing seals

Replace packing seals

or the Delivery Drops

Broken valve springs

Replace springs

 

 

Belt slippage

Tighten or Replace belt

 

Worn or Damaged nozzle

Replace nozzle

 

Fouled discharge valve

Clean valve assembly

 

Worn or Plugged relief valve on pump

Clean, Reset, and Replace

 

 

worn parts

 

Cavitations

Check suction lines on inlet

 

 

of pump for restrictions

 

Unloader

Check for proper operation

Water in Crankcase

High Humidity

Reduce oil change intervals

 

Worn Seals

Replace seals

Noisy Operating

Worn bearings

Replace bearings, Refill

 

 

crankcase oil with recommended

 

 

lubricant

 

Cavitation

Check inlet lines for restrictions

 

 

and/or proper sizing

Rough/Pulsating

Worn packing

Replace packing

Operation with

 

 

Pressure Drop

Inlet restriction

Check system for stoppage

 

 

 

air leaks, correctly sized

 

 

inlet plumbing to pump

 

Accumulator pressure

Recharge/Replace accumulator

 

Unloader

Check for proper operation

 

Cavitation

Check inlet lines for restrictions

 

 

and/or proper size

Pump Pressure as

Restricted discharge plumbing

Re-size discharge plumbing to flow

Drop at gun Rated,

 

rate of pump

Pressure

 

 

Excessive

Worn plungers

Replace plungers

Leakage

Worn packing/seals

Adjust or Replace packing seals

 

 

Excessive vacuum

Reduce suction vacuum

 

Cracked plungers

Replace plungers

 

Inlet pressure too high

Reduce inlet pressure

High Crankcase

Wrong Grade of Oil

Giant oil is recommended

Temperature

Improper amount of oil in crankcase

Adjust oil level to proper amount

 

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Giant GP7145GB, GP7255AGB operation manual Pump System Malfunctions

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.