Generac 004373-3, 004626-2 Cooling System, Overload Protection for, DC Fuse, Engine Coolant

Section 4 — Maintenance

Guardian Liquid-cooled 40 kW Generator

4.6COOLING SYSTEM

Air intake and outlet openings in the generator compart- ment must be open and unobstructed for continued prop- er operation. This includes such obstructions as high grass, weeds, brush, leaves and snow.

Without sufficient cooling and ventilating air flow, the engine/generator quickly overheats, which causes it to shut down.

The exhaust system of this product gets extremely hot and remains hot after shutdown. High grass, weeds, brush, leaves, etc. must remain clear of the exhaust. Such materials may ignite and burn from the heat of the exhaust system.

4.7OVERLOAD PROTECTION FOR

ENGINE DC ELECTRICAL SYSTEM

Engine cranking, start-up and running are controlled by a solid-state engine controller circuit board. Battery voltage is delivered to that circuit board via a 15-amp fuse. These overcurrent protection devices will open if the circuit is overloaded.

If a circuit breaker opens or a fuse element melts, you should find the cause of the overload before resetting the circuit breaker or replacing the fuse.

4.8DC FUSE

The generator panel’s 15-amp AGC fuse (Figure 4.4) pro- tects the DC control circuit against overload. The fuse is wired in series with the battery output lead to the panel. If the fuse element has melted open, cranking or starting the engine cannot occur. Replace the fuse using only an identical 15-amp AGC replacement.

Figure 4.4 – Location of 15-amp Fuse

15

4.9ENGINE COOLANT

Check the coolant level in the coolant recovery bottle.

•Add the recommended coolant mixture as necessary. See Section 1.10 on Page 7.

•Periodically remove the radiator pressure cap to make sure the coolant recovery system is functioning properly. Coolant should be at the bottom of the radia- tor filler neck. If the coolant level is low, inspect the gasket in the radiator pressure cap. Replace the cap, if necessary. To have the pressure cap tested, contact a Generac/Guardian Authorized Dealer. Inspect the cool- ing system and coolant recovery system for leaks.

4.10 MISCELLANEOUS MAINTENANCE

‹4.10.1 CLEANING THE GENERATOR

Keep the generator as clean and as dry as possible. Dirt and moisture that accumulate on internal generator windings have an adverse effect on insulation resist- ance.

Periodically, clean the generator’s exterior surfaces. A soft brush may be used to loosen caked on dirt. Use a vacuum system or dry, low pressure air to remove any accumulations of dirt. The generator is housed inside an all-weather enclosure; clean the enclosure with a soft, damp cloth or sponge and water.

Once each year, have the generator cleaned and inspect- ed by a Generac/Guardian Authorized Dealer. Service technicians will use dry, low pressure air to clean inter- nal windings. Parts inside the control console should be cleaned and inspected at this time as well.

Finally, have the insulation resistance of stator and rotor windings checked. If insulation resistances are excessively low, the generator may require drying.

‹4.10.2 RODENT PROTECTION

The intrusion of rodents into the generator set can cause a wide range of problems, from failure of the unit to start, to personal injury and, in extreme circum- stances, short circuit or fire. Although the unit was designed to limit this problem, further precautions can be taken by the owner to help minimize both the chance of rodent entry and the extent of any damage. The fol- lowing inspection should be performed.

1.The base frame of the unit contains an optional fuel inlet location and four lifting holes that are capped at the factory. These caps are sometimes removed for transportation during installation but always should be replaced afterwards. Check that they are secured in place. The same applies for any access ports in the roof of the enclosure. If any of these caps are missing, contact a Generac/Guardian Authorized Dealer.

Generac® Power Systems, Inc. 17