Section 4 — Maintenance

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

4.8ADJUSTING VALVE CLEARANCE

After the first 50 hours of operation, adjust the valve clearance in the engine.

Important: If feeling uncomfortable about doing this procedure or the proper tools are not available, please contact the Generac Authorized dealer for service assis- tance. This is a very important step to insure longest life for the engine.

To adjust valve clearance:

•Make sure the engine is at room temperature.

•Make sure that the spark plug wire is removed from the spark plug and out of the way.

•Remove the four screws attaching the valve cover with a #2 or #3 phillips screwdriver.

•Make sure the piston is at Top Dead Center (TDC) of its compression stroke (both valves closed). To get the piston at TDC, remove the intake screen at the front of the engine to gain access to the flywheel nut. Use a large socket and socket wrench to rotate the nut and hence the engine. While watching the piston through the spark plug hole. The piston should move up and down. The piston is at TDC when it is up as high as it can go.

•Loosen the rocker jam nut. Use an 10mm allen wrench to turn the pivot ball stud while checking clearance between the rocker arm and the valve stem with a feeler gauge. Correct clearance is 0.002-0.004 inch (0.05-0.1 mm).

NOTE:

Hold the rocker arm jam nut in place as the pivot ball stud is turned.

When valve clearance is correct, hold the pivot ball stud in place with the allen wrench and tighten the rocker arm jam nut. Tighten the jam nut to 174 in/lbs. torque. After tightening the jam nut, recheck valve clearance to make sure it did not change.

Figure 4.10 - Valve Clearance Adjustment

Rocker

Pivot BallArm

Stud

Jam Nut

Valve

Stem

•Install new valve cover gasket.

•Re-attach the valve cover. NOTE:

Start all four screws before tightening or it will not be possible to get them in place. Make sure the valve cover gasket is in place.

•Re-attach the spark plug wire to the spark plug.

•Repeat the process for the other cylinder.

4.9COOLING SYSTEM

Air inlet and outlet openings in the generator compart- ment must be open and unobstructed for continued proper 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 quickly shut down. (See Figure 4.9 for vent locations.)

Figure 4.9 – Cooling Vent Locations

The exhaust from 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.

The maximum ambient temperature for the

!generator is 48.9° C (104° F).

20 Generac® Power Systems, Inc.

Page 21 Page 23
Page 22
Image 22
Generac Power Systems 04758-1, 04759-1, 04760-1 owner manual Adjusting Valve Clearance, Cooling System
Page 21 Page 23

04758-1, 04759-1, 04760-1 specifications

Generac Power Systems is a leading manufacturer of power generation equipment, particularly known for its innovative solutions in backup and portable power. Among its impressive product lineup, the Generac models 04758-1, 04759-1, and 04760-1 stand out for their reliability and advanced features, making them ideal choices for residential and commercial applications.

The Generac 04758-1 is a robust standby generator that delivers a powerful output of 22kW. It is designed to automatically kick in during power outages, ensuring that homes remain powered without the need for manual intervention. One of its main features is the innovative Mobile Link app, which allows users to monitor their generator's status remotely through their smartphones. This model also incorporates Generac's G-Force engine, which is designed with durability in mind, providing longer run times and enhanced performance.

The 04759-1 model builds on its predecessor's strengths by enhancing its power capabilities. With a 24kW output, it efficiently supplies power to larger homes or small businesses that require reliability during outages. Its True Power Technology ensures clean power output, making it suitable for sensitive electronics. The 04759-1 also boasts advanced diagnostic features, allowing for self-testing and maintenance alerts, which contribute to its user-friendly design.

Moving up in the lineup, the Generac 04760-1 generator further amplifies power output, reaching an impressive 26kW. This model is tailored for those who demand the utmost in power reliability, featuring an aluminized steel enclosure that enhances durability and rust resistance. The 04760-1 is equipped with Wi-Fi connectivity, enabling real-time updates and notifications directly to users’ mobile devices. Its superior sound attenuated design operates quietly, ensuring minimal disruption during operation.

All three models are equipped with the Quiet-Test technology, which allows for a low-decibel exercise cycle that reduces noise levels without sacrificing performance. Additionally, Generac back them with a comprehensive warranty and customer support, assuring consumers of their long-term reliability and effectiveness. With advanced features, superior performance, and innovative technology, the Generac 04758-1, 04759-1, and 04760-1 models offer dependable solutions for power generation needs, catering to a diverse range of applications while ensuring peace of mind during power interruptions.
Top Page Image Contents