Request for Proposal

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Contents

Work Proposal

Introduction:

Our group has been assigned the ‘Honda HW7000EH’ generator as the topic of our reverse-engineering project. In order to be productive, efficient, and successful in our analysis of this product, we have decided to lay out a system of procedures and protocols to help us increase our understanding of the product and communicate what we learn with each other.

Plan for Reverse Engineering:

Pre-Dissection:

In preparation of the initial dissection, it is important that every member of the group be able to follow the same procedure for referencing different components, systems, and subsystems of the machine. The product manual serves us as a starting point, by lettering a number of the important systems and components [2]. We will use this identification system where it applies.
For all the major subsystems where the provided letters don’t apply, we will be applying the lettering system to the remaining unnamed components or systems. Within each system, every part will be given a name, catalog part number, and description. A template for naming parts will be provided at the dissection site. The side of the machine with power outlets and “ON/OFF” switch will be referred to as “FRONT”.
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Figure 1: Honeywell Generator

As each part is removed from the machine, it will be:

  • Named
  • Numbered
  • Described
  • Photographed
  • Stored

See “PRODUCT TEMPLATE” for naming parts in management proposal for more details.

Upon initial inspection of the HW7000, we have devised and outlined a plan of action. Essentially it will be to work from the outside inward; by removing systems on the exterior of the machine and working toward the motor. After each system, subsystem, or component is removed, it will be further analyzed and dissected separate from the machine.

Dissection Outline:

The main dissection outline has been broken down into nine separate objectives, with a tenth objective of ‘Reassembly’, which will be further outlined after dissection. The machine will be disassembled in the following order:

1. Transportation Components: Components relating to moving or handling
  • Wheels
  • Feet
  • Protective Covers
  • Mounting Components
2. Fuel (J): Any part relating to fuel storage
  • Gas tank
  • Fuel line
  • Covers
  • Mounting Components
3. Electric Control Interface (A): Components relating to the main power center
  • Covers
  • Entire Grey Panel
  • Start/stop
  • Power Connection
  • Mounting Components
4. Air Cleaner Assembly (H): Components relating to cleaning of air
  • Filters/Ducts
  • Black Housing
  • Mounting Components
5. Muffler: Components relating to processing of secondary exhaust
  • Spark Arrestor
  • Connecting Ducts
  • Mounting Components
6. Carbon Canister: Components relating to the processing of primary exhaust
  • Connecting Ducts
  • Mounting Components
7. Carburetor: Components relating to combination of fuel and oxygen
  • Air Ducts
  • Choking System
  • Mounting Components
8. Engine: Disconnection of core engine from frame
  • Any Remaining Connection
  • Mounting Components
9. Separation of Engine and Generator: Any parts common to both
  • Housing
  • Drive Shaft
  • Mounting Components
10. Reassembly: Evaluate Reassembly objectives
  • Work in reverse from disassembly
  • Apply new knowledge of components

Required Tools:

We will keep a running list of required tools. All tools that we foresee being needed based on our preliminary inspection of the machine have already been added.

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Table 1: Required Tools Chart (Revised)

Timeline and Project Plan:

Our group will meet at the beginning of each gate to plan how and when each component of the gate will be handled. The Capen library will be the hub of all clerical meetings. Meeting times will be placed at strategic times within each gate time period to collaborate on each other’s results, to plan upcoming commitments, and to finalize our gate reports. Each process should take no more than two weeks to accomplish. During these two week time periods, there will be arranged meetings at the Product Dissection Lab. Attendance at this meeting will include at least a dissector and a documenter. All five Gates and task components of each are listed on the Gannt chart in the Management Proposal. These display how and when the group will manage each task that is assigned throughout the project. Each gate will take approximately two weeks. In the management proposal below is a more detailed view of how long each stage will take. Please refer to the Gantt chart.

Challenges and Shortcomings:

There are many factors that could result in a set back of the team. Our team will work constructively and positively through any foreseen or unforeseen challenges and shortcomings.


Not Enough Time” – The generator assigned is a complex machine so it is inevitable that the team will have to work regularly and often to meet deadlines. One solution to this problem is prevention. By careful scheduling and overestimating the time required, the team should be able to complete each assigned task on time. If deadlines are not met, the team will work positively and collectively to complete the task in a timely fashion. This applies to each job assigned to each person. If a job proves to be too much for one person, our group will work to finish the assigned task if deadlines are not met. Abuse of this policy will not be tolerated by the team.


Absence of Member”- If a team member is unable to attend a meeting or work on their assigned task due to a legitimate reason approved by the other group member’s, that members work will be distributed evenly amongst the rest of the team’s members. Approved excuses fall into examples such as family death, resigning of the course, prolonged sickness, etc.


Lost or damaged Material”- When reverse engineering a product, things are bound to be misplaced or maybe even broken. To work through this the team will make adjustments as needed, purchase extra materials or contact the instructor or TA’s if needed.


Incompetence”- If a team member seems to frequently be behind on his/her work, the team will go back and re-evaluate the group member’s work load. If needed, adjustments will be made and new responsibilities will be assigned if the work load of an individual proves to be too much. If the work load is obviously not overbearing, steps will be taken to not only give the individual a chance to finish their responsibility, but the instructor will also be notified.


Organization”- The generator assigned to the group has many different components and parts. To prevent clutter and unorganized documentation, the team has created a template that will be used to document each and every part of the generator. The template is structured in such a way that not only every part receives a part number, but every part has a description. The template also gives other parts that are related or connected to the part documented. Aside from the template, cameras will be used for visual reference aid during the dissection and reassembly phases. Ziploc bags and boxes will be used to sort parts into their set categories. Please refer to the management proposal for a further review of these organization techniques.

Capabilities of Group Members:

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Table 2: Group Capabilities

As individuals, we all specific skills we would like to work on. Below are some listed goals or skills that each one of us would like to develop.

John - Public Speaking and Organizational tools
Mary Kate - Wiki Usage
Joe - Knowledge of engine intricacy and Leadership skills
Nick - Leadership responsibilities and technical work
Eric - Technical Communication and software use

Management Proposal

Introduction:

The manner in which our group plans to manage our work is to break up the required sections of the project into easily manageable components. We will use the methods and protocol that we have developed in order to complete the necessary requirements for completion. Our methods and protocol will be described in detail in the following management proposal.

Protocol of Part Documentation:

Below are some methods that the team will utilizes to ensure the organization of the project:


Binder: A binder with a product template, checklist, and photos will stay with the generator at all times. This will help the team stay organized and informed of what other members have done. Members are encouraged to sketch parts if needed and to fully utilize the checklist. The product template and checklist are shown below:


Product Template
Part Number:
Name of Part:
Description:
Where is it located:
What does it look like:
What material is it made of:
What’s the function:
Related Part Numbers:


Part Cataloguing Procedure:

While removing components from the generator, it will be critical to follow a system for documenting them. The Following checklist should always be used as a method of insuring proper documentation:

Part Catalogue Checklist:

_____ Name component in accordance with procedure (Name and Number)
_____ Tag (Tag or mark all removed components at the time of removal)
_____ Store (Newly catalogued components should be stored according to the system they belong to)
_____ Description of Part (Color, size, material)
_____ Description of Location (System or Subsystem is belongs to)
_____ Brief Description of Function (Specific job carried out by component)
_____ Notes on removal (Steps taken to remove or disassemble)
_____ Initial (Initial all entries incase questions arise later)


Camera: A camera with all the part’s pictures will be in a locker. When team members go to dissect or reassemble the generator, they will be required to document all the parts with pictures. These will act as visual aids when writing up the reports for the gates.


Storage: Boxes and Ziploc bags will be used appropriately during the dissection and reassembly of the generator. Parts with similar designated part numbers will be organized together.

Points of Contact:

UB Mail Accounts: The instructor or any TA may get in touch with each group member individually by emailing each member’s respective University email accounts listed below.


-John Vinti: johnvint@buffalo.edu
-Joseph Robison: josephro@buffalo.edu
-Mary Kate Baker: marybake@buffalo.edu
-Eric Wettlaufer: ericwett@buffalo.edu
-Nick Marucci: npm7@buffalo.edu


Team Email: The team email account allows team members to submit written assignments in electronic form to one location. This allows each member to access any of their team members work if need be from any location with Internet access. We encourage the instructor and TA’s to email the team members individually to personal Buffalo accounts to ensure that everyone has a written copy of important information addressed to them personally. We will use this email to organize our work and should NOT be used as a point of contact to speak to the team collectively. However, it can be used as a resource for the instructor and TA’s to view which parts of each assignment was completed by each member.


This email address is: mae2772010@gmail.com


Team Leaders: As we do encourage the TA’s and instructors to meet with the team as a whole, John Vinti and Nick Marucci will also be available to forward information to the rest of the group members if a collective meeting is not possible. John Vinti and Nick Marucci will also be able to speak on behalf of the team.

Outline for Time Management

Gantt Chart:

The Gantt Chart is an organizational tool that allows for the group to plan when and where we will meet at the beginning of each gate. These meetings are to plan how each section of the gate will be performed. The majority of our clerical meetings will take place in the Capen library and will be approximately one and a half hours. Meeting times will be placed at strategic areas within each gate time period to compile each other’s results, to plan upcoming commitments, and to finalize our gate reports. These meeting times are colored in light blue on the Gannt Chart (below). In Gates 2 and 4, the product will be disassembled and reassembled. These are denoted by the red figures. Each process should take no more than two weeks to accomplish. During these two week time periods, there will be arranged meetings at the Product Dissection Lab. All five gates and task components of each are listed on the Gannt chart. These display how and when the group will manage each task that is assigned throughout the project.


Gate 1:
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Table 3: Gantt Chart: Gate 1
Gate 2:
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Table 4: Gantt Chart: Gate 2
Gate 3:
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Table 5: Gantt Chart: Gate 3
Gate 4:
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Table 6: Gantt Chart: Gate 4
Gate 5:
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Table 7: Gantt Chart: Gate 5
Legend:
Legend
Table 8: Legend for Gantt Chart

Group Member Roles:

Group 2 consists of the following members:

Wettlaufer, Eric

1. Chief Dissector and Parts Technician:
  • Keep group informed on current dissection tasks and procedures
  • Supply required tools
  • Account for all parts and their respective cataloguing
  • Apply established protocols
  • Parts descriptions
  • Analysis of systems and components
  • Stock all necessary supplies for cataloguing


Marucci, Nicholas

1. Work Manager:
  • Is a point of contact for the group and will address any project related issues with the instructor and TA’s.
  • Schedules deadlines for project tasks and updates the Gantt chart as tasks are accomplished.
  • Makes adjustments to scheduling within reason to ensure task completion and to promote thoroughness.
  • Oversees other group members in order to make sure tasks are completed on time.
  • Delineates any tasks that come up unexpected to other group members as needed.
  • Assists the dissector with product disassembly and documentation.
2. Assistant Dissector/Reassembler:
  • Assist the chief dissector in wherever he may choose
  • Take role of documenting if head documenter is absent


Baker, Mary Kate

1. Head Documenter:
  • Making sure documentation is done following protocol
  • Making sure all documentation tools are present before dissection
  • Be available for as many dissections as possible
2. Website Developer
  • Managing Wiki
  • Reformatting pictures
  • Final check of work
  • Keep group members updated on Wiki
  • Provide members with basic info on how Wiki works


Robison, Joseph

1. Chief Editor and Technical Writer:
  • Typing up documentation
  • Proof read all documents before final post on Wiki
  • Ensure consistent formatting in all documents
  • Ensure all figures, tables, and graphs are properly labeled and cited
  • Promote proper use of parenthetical citations
2. Assistant Dissector/Re-assembler:
  • Assist the chief dissector in wherever he may choose
  • Take role of documenting if head documenter is absent


Vinti, John

1. Project Manager:
Note: The project manager’s responsibilities are to ensure the success and completion of the project. These various responsibilities can be categorized into types:
1. Communication:
  • The project manager is responsible for the enforcement of the set due dates and appropriated deadlines.
  • To inform others of what will happen at each meeting prior to the date and time.
  • To find answers to questions that the team cannot formulate collectively.
  • To help resolve issues and conflicts in a constructive manner that will benefit the team as a whole in accordance with the group conflict guidelines outlined in the management proposal.
  • To recognize and celebrate individual and/ or team successes as well as to recognize and positively correct individual and/ or team failure.
  • Work in co-ordinance with the work manager.
2. Coordination:
  • To ensure that discussions and meetings are on topic and lead towards closure.
  • To work and act as a point of contact with the instructor.
  • To ensure that the team stays on track and does not deviate from the task
  • To lead by example as well as words.
  • To organize Team email address and to keep open communication between members.

Group Conflicts:

There are many types of conflicts that a team or group may face when working together. Some types of foreseen conflicts and proposed solutions are listed below.


Relationship Conflicts- Relationship conflicts may or may not be easily recognized. This occurs between two individuals on the team. The first step to conflict resolution should be between the involved parties. If this proves insufficient, the conflict will be openly recognized by the group as a whole. The group will come together collectively and will resolve the conflict as best as it can.


Task Conflicts- This occurs when two or more members have different plans of action. In order to resolve this type of conflict the team will create a pros and cons list of each plan of action. The team will then re-evaluate to proposed plans of action and choose the best one.


Inner Conflict- Inner conflict occurs when team members become overwhelmed with work. To prevent this, a careful schedule will be put in place. To help, the team will keep a positive attitude towards the task at hand and lend moral and labor support to another team member if needed.


Authority Conflict- authority conflict happens when bad leadership is in place. Authority conflict can occur amongst the team itself or between the team and the instructor or TA. To rectify an authority conflict amongst the team, members will vote on issues and veto a decision made by the group leader or any other team member. To correct conflict between a team and its instructor or TA, meetings should be called if steps such as email do not resolve an issue.


For perpetual or irresolvable conflicts that occur, a meeting will be scheduled with the involved parties and the instructor.

Initial Product Assessment

Device: Honda HW7000EH Portable Generator


Development Profile:

The 7000 Watt Honeywell generator, powered by Honda, was designed to give the consumer a portable, gas powered form of power that can be used on many different tools and appliances. This product was provided to the public to use in areas or situations where power is not available, whether it be away from home or during a power outage. The generator is easy to use and comes with an easy start-up guide. This product was filed in 2007 and was patented in 2008 [4]. It is sold in over a hundred different countries around the world including the United States, China, India, and Japan, where the majority of their sales are delivered [3].
A key global and environmental concern when producing the generator is emissions. Under the Occupational Safety and Health Administration (OSHA) and the California Air Resources Board (CARB) guidelines, there are certain emission limits that the generator must fall below [5,3]. The generator is compliant with these regulations. Weather is another global concern. The generator was designed to operate in temperatures from 14 degrees F (-10 C) to 114 degrees F (40 C) [2]. It was also made to withstand inclement weather for use during power outages. No installation is required and the generator was built to last with a three year warranty [1]. For marketing purposes, certain religions and cultures would be unable to use this product. Amish and Mennonite cultures do not believe in the use of electric motors. The factor of safety for the generator is fairly low, but certain conditions should be recognized. It is not intended to be used indoors or in any closed spaces without ventilation. Use of the product, while wet, is not recommended either, due to possible electrocution. One final consideration is altitude. At high altitudes, above 5000 feet above sea level, fuel consumption will increase and performance will decrease. A carburetor modification can be done to improve these conditions [2].

Usage Profile:

The Honda HW7000EH is a 210 lb, gasoline-powered, portable electric generator. Its intended use is to provide a significant amount of electricity (7000W) where it would otherwise be unavailable [1]. The most common use of this product would occur at home, during power outages. The generator is designed to allow the consumer to “Keep the lights on, the water hot, the fridge cold and the TV tuned in [1].”
Due to its portability and ease of use, this product is also intended to be useful in a number of additional, sometimes professional, situations. Examples of professional use would be powering tools or compressors at a job-site, or providing electricity to a small business or building where extended power-outages might be harmful to business. Other uses would include anything from powering electronics for sports fans while tailgating, or providing electricity where large scale electric infrastructure is unavailable or does not exist.
The primary job, or function, of the HW7000EH is to provide a steady, usable, reliable supply of electricity. In order to complete this primary function the generator has to carry out a number of secondary functions. To start, it needs to store fuel (gasoline), enough to run the machine at half capacity for eight hours [1]. Also, it needs to be mobile, with attached ‘never-flat’ wheels and handles, which allow it to be taken out and put away as needed. The generator needs to be operated by the consumer, often at night during power outages. Therefore, it needs to have an easily understood, intuitive interface. This interface allows it to be turned on, adjusted, and utilized by the operator. It needs to protect itself against detrimental misuse, with such precautionary functions as low-oil shutoff and overload protection [1].
This generator provides electricity where it is not otherwise available, at home, on the job-site, or elsewhere. It does this by turning the stored energy in its gasoline into electrical energy. It is appropriate to be used wherever electricity is needed; with the exceptions of poorly ventilated areas, indoors, or where an able-bodied operator isn’t present.

Energy Profile Honda Generator:

Types of Energy Used:

The Honda generator utilizes human, potential, kinetic, electric, chemical, gaseous, mechanical, and sound energy. The main source of energy is the liquid gasoline that serves as the fuel to start and to continue the engine. The main product of the gasoline is the electricity that is produced at the end of the energy transformation process. It is important to note that energy in the form of heat is emitted throughout the energy transformation process explained below.

Energy Transformation

Human:
Consumers use their own energy to pour gasoline into the top red gas tank and to power on the generator by pulling the crank rope.
Note: The generator has the capability for an electric start. Part of the human energy can be replaced by electric energy by adding a battery to the generator to bypass the pull crank [1, 2].
Potential:
Since the gas tank is located at the very top of the generator, this gives gasoline added mechanical potential energy. By having the tank at the very top, it allows for more energy transferred to other steps.
Kinetic:
The mechanical potential energy turns to kinetic energy as the gasoline flows down the gas lines.
Electric:
As the gasoline enters the motor chamber, a spark in the form of electric energy from the spark plug is produced.
Chemical:
The chemical reaction from the gasoline and the spark is called combustion. This releases the energy stored in the gasoline.
Gaseous:
The chemical reaction between fuel, oxygen, and the spark allows the liquid gasoline to expand into a gaseous state. This expansion causes mechanical motion. Note that some of this gaseous product is transferred back to the environment in the form of what we know as “exhaust”.
Mechanical:
As the gas expands in the chamber, a crank is turned, which then rotates a rod located in a magnetic field.
Electrical:
As this rod rotates in the magnetic field, electrons are produced which creates electricity that can transferred to products via the power control center. Refer to Figure 2 on the next page for a visual description of how the rod rotates and creates electricity [6].
Sound:
Energy in the form of sound is produced by the generator. Some of the energy of the system gets transferred into the air and reaches the consumers ear in the form of sound. This energy vibrates the consumer’s ears making the consumer hear a noise.
Heat:
As stated before, heat is produced in all of the energy transformations above. This can be explained through the second law of thermodynamics, which states that the entropy of the universe always increases. Therefore energy transformation will always produce heat which is lost and cannot be regained by reversing a process [7]. The ways in which some of the energy transformations produce heat are:
-Human:
Body heat from hands and friction between the handle of the gas container releases heat. The pull crank start causes human stress which creates heat inside and outside the consumer.
-Chemical:
The combustion process generates a great amount of heat. A combustion reaction is similar to a controlled explosion.
-Gaseous:
The gas created by the explosion is hot and is transferred to the surroundings as exhaust.
-Mechanical:
As parts move friction is created between them. Friction generates heat.


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Figure 2: How a rod rotates to create electricity

Complexity Profile:

There are many sub-systems on the Honeywell generator, such as the frame, gas tank, power board, and engine generator unit (Figure 3). There are also many components within each of these sub-systems. We approximate that the generator system will have 200 components. The frame is a simple support frame consisting of support brackets, generator stand, wheels, alternate battery stand, and handle bars with hand grips. The 6.1 gallon gas tank is positioned above the motor and generator. It has a plastic fuel cap and fuel gage with a glass viewport. The power board is a plastic cover to the unit with outlets for both 120 and 240 Volt appliances. It comes complete with a grounding terminal, three outlet breakers, a power switch, and an odometer style hour meter. The outlets and power switch are connected to the generator and starter, respectively.
The engine generator includes everything else within the unit. This can also be broken down into smaller sub-systems, as seen in Figure 3. This includes the engine component, exhaust manifold, oil reservoir, carbon canister, air filter compartment, and generator. The engine component is the main component of the generator unit. It includes the four stroke piston/valve compartment, a starter, recoil starter handle with rope line covered by a ventilated gate, spark plug covered by a spark plug cap, and mounting brackets with shock absorbing rubber. The exhaust manifold is a muffler directed outward to release exhaust fumes and is filtered by a mesh screen. The oil reservoir includes a dip stick/fill opening and a release cap. The carbon canister is connected to the air flow lines to clean the emissions flowing out of the exhaust [2]. The air filter compartment is accessible by two pull-back clamps. Within is a standard air filter used to filter dirt or any other imbalance in the air flow. The generator is connected directly to the motor of the engine by a shaft and coil to develop an electrical current. This is connected to the outlet portion of the power board and is also mounted with the shock absorbing mounting brackets.
All of the components in the generator unit interact with each other somehow. Some are more complex than others. A couple of the simpler interactions include the electrical transfer from the power switch to the starter and the electrical transfer from the generator to the outlets. The handle arms interact as a lever arm to the generator. User interaction is simple. The user inserts plugs into the outlets, lifts the handle arms, presses the power switch, and also manually starts the generator. Manually starting the generator is a little more complicated than the automatic start option. The user pulls the recoil starter to start the engine. There is a rotational motion between the motor and generator. Fuel and oil are also inserted into the engine for operation. The exhaust is then run through the carbon canister, air filter and out through the muffler.
The connection of subsystems are very complex in this system. We look to explore this complexity more in Gate 2. As for now we can speculate that all the subsystems will be dependent on the others. In other words, without one subsystem or one specific connection, the generator will fail.
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Figure 3: System to Component Distribution Chart

Materials Profile:

Clearly visible materials on the generator (external)

  • Rubber
-Handles
-Tires
  • Metals
-Cast Iron
-Steel
-and other metals
There are metals present all over the exterior of the generator; there are metal screws, a cast iron sleeve, holding pins and all the metals on the exterior of the engine itself [10].
  • Plastic
-Facing with switches
-Outlets
-Battery casing
-Wheel rims
-Pull start
-Gauges
-As well as other cases of parts
  • Wires
-Connecting wires
-These wires are also covered with rubber casing
As far as the internal materials of the generator, it most likely consists of engine parts such as gears, pistons, cylinders, a spark plug (ceramic), valves, connecting rods, crankshafts, and other parts associated with engines. Most of these parts are made of metal and usually coated in oil to decrease friction and prevent the engine from overheating. Other materials potential inside the generator are copper coils, magnets, gasoline, and aluminum [9].

User Interaction Profile:

The user interface of this product is not complex but the user must check specific settings and buttons on the generator before starting. There are no complex components that the user needs to deal with, only buttons, switches and pull start cords. The interface itself is somewhat complex, usually with things that look like buttons or switches the user knows to push or turn it respectively.
This product can be a bit tricky to use, but when following the instructions in the owner’s manual it is broken down for the user step by step. Assuming the generator is already assembled and has been grounded by a licensed electrician, the user has two options on how to start their generator. It can be started electrically by setting the circuit breakers, turning the fuel shut off valve to the ON position, pulling the choke control to the ON position and then holding the start button until the engine starts. The user’s second option is to start the generator manually, which is the same as starting it electrically except instead of holding the start button you change the engine control switch to the RUN position and then start it using the pull start. As long as the user is able to follow the instructions and understand the diagrams in the manual they should have no problem using the generator. The instructions on how to stop the generator and turn it off are also clearly noted in the user manual [2]. There is also an instruction guide on the top of the generator that shows how to use the generator but also directs the user to the instruction manual before using. The routine maintenance described in the table is fairly easy and is doable by the common handy man. Maintenance of the engine itself and of larger componenets should not be attempted because of the complexity of the engine.
Periodic maintenance and adjustments are required to keep the generator operating properly. Table 9 shows the maintenance that should be performed and how often it should be performed.
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Table 9: Maintenance required for the Honda HW 7000 EH Generator (2)

Product Alternative Profile:

There are many product alternatives to the “Honeywell HW7000EH -7000 Watt Honda Powered Portable Generator” (see figure 4) that exist. Some examples are the “United Power 7200 Watt Electric Generator” (see figure 5), “Champion 7000 Watt Generator” (see figure 6), and “Generator Guardian Plus 7000 Watts” (see figure 7).
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Table 10: Compared Specifications of 4 Different Generators
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Table 11: Advantages and Disadvantages of the 4 Compared Generators
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Figure 4: Honeywell Generator
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Figure 5: United Power Generator
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Figure 6: Champion Generator
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Figure 7: Guardian Generator

References

[1] Owner’s Manual. (n.d.). Electric Generators Direct. Retrieved September 28, 2010, from [1]

[2] Portable Generators HW7000EH. (n.d.). Electric Generators Direct. Retrieved September 28, 2010, from [2]

[3] Generators. (2010). Retrieved September 27, 2010 from Honda Worldwide: [3]

[4] High speed generator rotor design incorporating positively restrained balance rings. (2010). Retrieved September 27, 2010 from USPTO Patent Full-Text and Image Database: [4]

[5] Honda Recreational Generators. (2009). Retrieved September 25, 2010 from Honda Power Equipment: [5]

[6] Hyper Physics. (2010, September 27). How a generator works. Retrieved from [6]

[7] Second law of thermodynamics. (2010, September 28). Retrieved from [7]

[8] Brain, Marshall. (01 April 2000). How Emergency Power Systems Work. Retrieved from [8]

[9] Marshall Brain (2008). How Car Engines Work. Retrieved from [9]

[10] Electric Generators Closeout. Retrieved from [10]

[11] Portable Generator | 7000 Watt Electric Generator | Honda Generator| Cheap Generator. (n.d.). Portable Generators | Diesel Generators | Pressure Washers | Electric Generator | Honda Powered Generators | Water Pumps. Retrieved from [11]

[12] Generac Guardian Plus 7000 Watt Generator. (n.d.). Cable Management, Electrical Supplies and Friendly Service at CableOrganizer.com. Retrieved from [12]

[13] Champion 7000 Watt Generator - 40023 at The Home Depot . (n.d.). Home Improvement Made Easy with New Lower Prices | Improve & Repair with The Home Depot. Retrieved from [13]