Guardian 4721 Repair Manual page 2

Proper service and repair is important to the safe, economical and reliable operation of all
standby electric power systems. The troubleshooting, testing and servicing procedures recom-
mended by Generac and described in this manual are effective methods of performing such
operations. Some of these operations or procedures may require the use of specialized equip-
ment. Such equipment should be used when and as recommended.
It is important to note that this manual contains various DANGER, CAUTION, and NOTE blocks.
These should be read carefully in order to minimize the risk of personal injury or to prevent
improper methods or practices from being used. Use of improper or unauthorized practices
may damage equipment or render it unsafe. The DANGER, CAUTION and NOTE blocks are not
exhaustive. Generac could not possibly know, evaluate and advise the service trade of all con-
ceivable ways in which operations described in this manual might be accomplished or of the
possible hazardous consequences of each way. Consequently, Generac has not taken any such
broad evaluation. Accordingly, anyone who uses any troubleshooting, testing or service proce-
dure that is not recommended by Generac must first satisfy himself that neither his safety nor
the equipment's safety will be jeopardized by the procedure or the method he selects.
SAVE THESE INSTRUCTIONS – The manufacturer suggests that these rules for safe opera-
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tion be copied and posted in potential hazard areas. Safety should be stressed to all opera-
tors and potential operators of this equipment.
Study these SAFETY RULES carefully before installing, operating or servicing this equipment. Become famil-
iar with the Owner's Manual and with the unit. The generator can operate safely, efficiently and reliably only
if it is properly installed, operated and maintained. Many accidents are caused by failing to follow simple and
fundamental rules or precautions.
Generac cannot anticipate every possible circumstance that might involve a hazard. The warnings in this
manual, and on tags and decals affixed to the unit are, therefore, not all-inclusive. If using a procedure,
work method or operating technique that Generac does not specifically recommend, ensure that it is safe
for others. Also make sure the procedure, work method or operating technique utilized does not render
the generator unsafe.
Despite the safe design of this generator, operating this equipment imprudently, neglecting its main-
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tenance or being careless can cause possible injury or death. Permit only responsible and capable
persons to install, operate or maintain this equipment.
Potentially lethal voltages are generated by these machines. Ensure all steps are taken to render the
machine safe before attempting to work on the generator.
Parts of the generator are rotating and/or hot during operation. Exercise care near running genera-
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tors.
Page ii
Important Safety Notice
DANGER