Kohler Generator Maintenance Guide for 12RES and 8.5RES Models
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b.Clean the gasket sealing surface of the oil filter adapter.

c.Apply a light coat of clean oil to the rubber seal of the new oil filter.

d.Install the new oil filter following the instructions provided with the filter.

Note: Dispose of all waste materials (engine oil, fuel, filter, etc.) in an environmentally safe manner.

3.Fill with oil.

a.Remove the oil fill cap and fill the engine to the F mark on the dipstick. The engine oil capacity is 1.9 L (2.0 qt.). See Section 3.3.3, Engine Oil Recommendation, for oil selection.

b.Reinstall the dipstick and the oil fill cap.

c.Check that the generator set master switch is in the OFF position.

d.Reconnect the generator set engine starting battery, negative (--) lead last.

e.Reconnect the power to the battery charger.

f.Start and run the generator set for a minute to allow the oil pressure to reach the operating range.

g.Stop the generator set, wait 1 minute, and then recheck the oil level. Add oil to bring the level up to the F mark on the dipstick.

4.Check for leaks.

a.Check for oil leaks.

b.Fix leaks and recheck the oil level.

c.Reinstall the housing side panel.

3.4 Spark Plugs

Reset the spark plug gap or replace the plugs with new plugs as necessary.

1.Clean the area around the base of the spark plug to keep dirt and debris out of the engine.

2.Remove the spark plug and check its condition. Replace the spark plug if it is worn or if its reuse is questionable.

3.Check the spark plug gap using a wire feeler gauge. Adjust the gap to 0.76 mm (0.030 in.) by

carefully bending the ground electrode. See Figure 3-2 and Figure 3-3.

1--514

Figure 3-2 Checking the Spark Plug Gap

1--511

Figure 3-3 Adjusting the Spark Plug Gap

3.5Air Cleaner Element and Precleaner

The engine has a replaceable high-density paper air cleaner element with an oiled foam precleaner. See Figure 3-4.

Check for a buildup of dirt and debris around the air cleaner system. Keep this area clean.

Note: Operating the engine with loose or damaged air cleaner components could allow unfiltered air into the engine causing premature wear and failure.

3.5.1Precleaner Service

Use the following procedure to wash and reoil the precleaner as indicated in the service schedule. Wash and reoil the precleaner more often under extremely dusty or dirty conditions.

1.Place the generator set master switch in the OFF/RESET position.

2.Disconnect the power to the battery charger.

3.Disconnect the battery, negative (--) lead first.

4.Loosen the cover retaining knob and remove the cover. Remove the precleaner from the paper element. Wash the precleaner in warm water with detergent. Rinse the precleaner thoroughly until all

12 Section 3 Scheduled Maintenance

TP-6331 5/04

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Contents Models Controller Advanced Digital Control ADCTP-6331 5/04 Product Identification Information Controller IdentificationGenerator Set Identification Numbers Engine IdentificationTable of Contents Table of Contents TP-6331 5/04 Safety Precautions and Instructions BatteryAccidental Starting Engine Backfire/Flash Fire Exhaust SystemFuel System Hazardous Noise Hazardous Voltage/ Electrical ShockHeavy Equipment Hot PartsMoving Parts 246242 VI Safety Precautions and Instructions TPTPS-6331 5/04 Introduction NameplateEPA and California Emission Certification Service Assistance Features Specifications GeneratorEngine Advanced Digital ControlGenerator Set Components Generator Set ComponentsPrestart Checklist OperationExercising Generator Set Generator Set OperationControls and Indicators Starting Generator SetStopping Generator Set Fault Shutdowns Code Fault Description CheckContinuous Power Mode Resetting Controller after a Fault ShutdownBattery Charger Battery Charger OperationOperation TP-6331 5/04 Scheduled Maintenance Routine MaintenanceService Schedule LubricationOil Change Procedure Lubrication SystemLow Oil Pressure Shutdown Oil CheckAir Cleaner Element and Precleaner Precleaner ServiceSpark Plugs Paper Element Service Air Cleaner ComponentsCooling System Cooling Air Intake and ExhaustEZ-273000-J Storage Procedure Circuit ProtectionBattery Cylinder LubricationExterior Preparation Scheduled Maintenance TP-6331 5/04 Troubleshooting Generator Set TroubleshootingIntroduction Fault Codes Battery Charger TroubleshootingTroubleshooting Appendix a Abbreviations AnsiISO Page By Kohler Co. All rights reserved

12RES, 8.5RES specifications

The Kohler 8.5RES and 12RES generators are known for their robust reliability and efficiency, making them ideal solutions for both residential and light commercial applications. These generators are equipped with advanced technologies that ensure seamless power delivery during outages, giving users peace of mind.

The Kohler 8.5RES, with its 8.5 kW output, is perfect for homeowners who require backup power for essential appliances and systems. It efficiently powers refrigerators, lights, and heating or cooling systems, providing convenience when the grid is down. The 12RES, delivering 12 kW, caters to larger homes or small businesses, accommodating additional loads such as sump pumps and electric dryers.

One of the standout features of these generators is the Kohler Command PRO engine, designed for maximum performance and longevity. This engine operates with low noise levels, ensuring that any power interruption goes unnoticed. Both models come with an innovative digital control panel that simplifies operation and monitoring, allowing users to access critical information at a glance.

The Kohler 8.5RES and 12RES are equipped with the patented Automatic Voltage Regulation (AVR) technology. This feature maintains a steady voltage output to protect sensitive electronics from damage caused by power surges. The modular design of these units facilitates easy maintenance, with service intervals and replacement parts readily available.

For eco-conscious consumers, the Kohler generators meet EPA emission regulations, ensuring a cleaner energy solution. The units also offer a comprehensive sound-attenuated enclosure, resulting in quieter operation, making them suitable for use in suburban environments.

Installation is straightforward, with various connection options for natural gas and propane fueling. Both models come with a fully automatic transfer switch, providing seamless transition from grid to generator power. This ensures that critical systems are always operational during outages.

In summary, the Kohler 8.5RES and 12RES generators stand out for their reliability, advanced technology, and user-friendly features. Their powerful engines, efficient performance, and low emissions make them an excellent choice for anyone looking to invest in a dependable backup power solution. Whether for home use or light commercial needs, these generators provide the essential peace of mind that comes with knowing you have power when you need it most.
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