INTRODUCTION READ THIS MANUAL THOROUGHLY If you do not understand any portion of this manual, contact Generac or your nearest Generac Authorized Service Dealer for starting, operating and servicing procedures. Throughout this publication, and on tags and decals affixed to the generator, DANGER, WARNING, CAUTION and NOTE blocks are used to alert you to special instruction about a particular operation that may be hazardous if performed incorrectly or care-...
Part I — Operating Instructions Introduction ...Inside Front Cover Read This Manual Thoroughly ...IFC Contents ...IFC Operation and Maintenance ...IFC How to Obtain Service ...IFC Authorized Service Dealer Locator Number ...IFC Safety Rules ...2 Section 1 – General Information ...4 Generator Identification ...4 Generator Applicability ...5 Installation ...5...
Safety Rules PRIMEPACT 66G and 66LP Recreational Vehicle Generators SAVE THESE INSTRUCTIONS – The manufacturer suggests that these rules for safe operation be copied and posted in potential hazard areas of the recreational vehicle. Safety should be stressed to all operators and potential operators of this equipment. WARNING: The engine exhaust from this product contains chemicals known to the state...
ELECTRICAL HAZARDS • The generator covered by this manual produces dangerous electrical voltages and can cause fatal electrical shock. Avoid contact with bare wires, ter- minals, connections, etc., while the unit is running. Ensure all appropriate covers, guards and barriers are in place before operating the generator.
Section 1 – General Information PRIMEPACT 66G and 66LP Recreational Vehicle Generators GENERATOR IDENTIFICATION Please record the following information from the generator DATA DECAL or information decal. 1. Model Number ____________________ 3. kW Rating__________________________ 5. Phase ______________________________ 1. Generator Air Intake Screen 2.
GENERATOR APPLICABILITY These generators have been designed and manufac- tured for supplying electrical power for recreational vehicles. You should not modify the generator or use it for any application other than for what it was designed. If there are any questions pertaining to its application, write or call the factory.
Section 1 – General Information PRIMEPACT 66G and 66LP Recreational Vehicle Generators Figure 1.1 – Connection for 120 Volts Only Figure 1.2 - Connection for 120/240 Volts GROUNDED NEUTRAL STATOR WINDINGS SPECIFICATIONS 1.6.1 FUEL REQUIREMENTS This generator is equipped with a gasoline fuel system as standard equipment.
1.6.4 ENGINE SPECIFICATIONS Type of Engine PRIMEPACT 66G/66LP ...GN-480 Cooling Method ...Air-cooled Rated Horsepower PRIMEPACT 66G/66LP ...16 at 3600 Displacement PRIMEPACT 66G/66LP...480cc Compression Ratio...8.6 to 1 Cylinder Block ...Aluminum w/Cast Iron Sleeve Type of Governor ...Mechanical, Fixed Speed Engine Governor Speed ...2700 rpm Air Cleaner ...Paper Element w/Foam Precleaner Starter ...12-volt DC Electric Ignition System ...Solid-state w/Flywheel Magneto...
Section 2 – Operation PRIMEPACT 66G and 66LP Recreational Vehicle Generators NOTE: If this generator has been reconnected for dual voltage AC output (120/240 volts), you can install line breakers having an amperage rating that is different than that stated above. The replacement line breakers consist of two separate breakers with a connecting piece between the breaker handles (so that both breakers will operate at the same...
2.4.5 ENGINE EXHAUST GAS Before starting the generator engine, you should be sure there is no way for exhaust gases to enter the vehicle interior and endanger people or animals. Close windows, doors and other openings in the vehi- cle that, if open, might permit exhaust gases to enter the vehicle.
Section 2 – Operation PRIMEPACT 66G and 66LP Recreational Vehicle Generators 2.7.2 DO NOT OVERLOAD THE GENERATOR You can read the rated wattage/amperage capacity of your generator on the generator data decal (see Section 1.1 on Page 4). Applying electrical loads in excess of the unit’s rated capacity will cause the engine/generator to automati- cally shut down.
2.8.4 OVERVOLTAGE PROTECTION A solid-state voltage regulator (Figure 2.5) controls the generator’s AC output voltage. This regulator sup- plies an excitation current to the rotor. By regulating the rotor’s excitation current, the strength of its mag- netic field is regulated and, in turn, the voltage deliv- ered to connected electrical loads is controlled.
Section 3 – Maintenance PRIMEPACT 66G and 66LP Recreational Vehicle Generators CHANGING THE ENGINE OIL AND/OR OIL FILTER • Change the engine oil after the first 25 hours of operation (after the 25-hour break-in period, see Section 2.8.5, Page 10). Thereafter, change the oil every 100 operating hours.
filter must lock into slots on cover. 8. Install the cover, foam precleaner and paper filter. 9. Replace knob to retain the filter in place. Figure 3.3 – Engine Air Cleaner PAPER FOAM FILTER PRE-CLEANER COVER CLEAN AIR INTAKE SCREEN Clean all foreign material from the air intake screen (Figure 3.4) at least once every 100 hours of opera- tion.
Section 3 – Maintenance PRIMEPACT 66G and 66LP Recreational Vehicle Generators Be sure to reinstall the muffler plug tightly. Engine vibration could cause a loose plug to fall out. Without the plug in place, hot engine exhaust is directed out the opening. This hot exhaust, depending on the installation, could be directed to areas not able to withstand the extreme heat such as wooden floor boards or...
3.10 MAJOR SERVICE MANUAL To obtain a service manual for your generator, con- tact Generac or your nearest Generac Authorized Service Dealer. Make sure to identify your MODEL NUMBER and SERIES. 3.11 DRIVE BELT The engine drives the generator rotor by means of a pulley and drive belt arrangement.
Safety Rules PRIMEPACT 66G and 66LP Recreational Vehicle Generators DANGER: For fire safety, installation of a generator into a recreational vehicle must comply strictly with article 551, NFPA 70; ANSI C1-1975; AND, ANSI A119.2-1975/NFPA 501C “Standard for Recreational Vehicles” (Part 3, “Installation of Electrical Systems”). In addition, installation must comply with the manufacturer’s instructions and recommendations.
Page 21
ELECTRICAL HAZARDS • The generator covered by this manual produces dangerous electrical voltages and can cause fatal electrical shock. Avoid contact with bare wires, ter- minals, connections, etc., while the unit is running. Ensure all appropriate covers, guards and barriers are in place before operating the generator.
Section 5 – General Information PRIMEPACT 66G and 66LP Recreational Vehicle Generators PURPOSE AND SCOPE OF THE INSTALLATION INSTRUCTIONS These Installation Instructions have been prepared especially for the purpose of familiarizing installers and owners of the applicable equipment with the product's installation requirements.
Section 5 – General Information PRIMEPACT 66G and 66LP Recreational Vehicle Generators Figure 5.2 - Major Features and Dimensions PrimePact 66G and 66LP Control Panel Spark Plugs (both sides, not shown) Oil Fill/Oil Level Fuel Filter Oil Drain Plug Fuel Pump Starter Contactor Oil Filter Air Filter...
Section 6 – Installation PRIMEPACT 66G and 66LP Recreational Vehicle Generators Figure 5.3 - Connection for 120/240 Volts GROUNDED NEUTRAL STATOR WINDINGS • The AC connection system on all air-cooled PRIMEPACT series generators uses a GROUNDED neutral. • A separate green ground wire is connected to the recreational vehicle’s junction box.
• Protect the generator against road splash and debris. Baffles or splash guards may be required to protect cer- tain areas of the generator. To make sure the generator is adequately protected, road test the installation through mud, water and slush. Figure 6.2 –...
Section 6 – Installation PRIMEPACT 66G and 66LP Recreational Vehicle Generators • If constructing a compartment, line the exterior (underside) of the compartment floor with 26-gauge galvanized steel. • All seams, splices and joints of the compartment walls (unless vapor tight by design) should be caulked to prevent poisonous, flammable or explo- sive vapors from entering the vehicle interior.
• Vapor seal all compartment seams and joints. • Over the galvanized steel lining, install a combination of acoustical materials as mentioned in Section 6.2.3. To prevent fire or explosion, do not install any insulation or other absorbent materials on the interior or underside of the compartment floor.
Section 6 – Installation PRIMEPACT 66G and 66LP Recreational Vehicle Generators 6.2.5 COMPARTMENT FLOOR CUTOUTS You must provide openings in the generator compart- ment for the following items (Figure 6.8, Page 25): • Engine exhaust and cooling air outlets • Generator cooling air inlet •...
behind generator (Figure 6.13 ). Recommended clearance behind the back of the generator is at least 1/2 inch (13 mm). Figure 6.12 – Air Inlet Using Ductwork Figure 6.13 – Air Inlet in Vehicle Skirt VEHICLE FLOOR MINIMUM CLEARANCE 1-1/2" 6.3.3 COMPENSATING FOR RESTRICTIONS Such materials as screening, louvers or expanded metal can restrict the free flow of air.
Section 6 – Installation PRIMEPACT 66G and 66LP Recreational Vehicle Generators 6.4.1 FUEL TANK Either the generator must share the vehicle engine's fuel tank, or you must install a separate fuel tank for the generator set. All fuel tanks installed on the vehicle must be constructed, installed and restrained so they comply with applicable codes, standards and regula- tions.
Figure 6.15 – Typical Propane Gas Fuel System 6.5.2 SOME IMPORTANT CONSIDERATIONS When installing an LP gas system, consider seriously the following items: • All fittings, lines, hoses and clamps must be tight and free of leaks. Apply a pipe sealant to threads when assembling threaded connections.
Section 6 – Installation PRIMEPACT 66G and 66LP Recreational Vehicle Generators The greater the airflow through the carburetor venturi, the lower the pressure at the venturi throat. The lower the pressure at the venturi throat, the greater the diaphragm movement, and the greater the movement of the regulator valve.
Failure to provide and maintain a spark arrestor may be in violation of the law. If this generator is used on any forest covered, brush covered or grass covered unim- proved land, you must provide a spark arrestor. The vehicle owner or operator must maintain this device in good condition.
Section 6 – Installation PRIMEPACT 66G and 66LP Recreational Vehicle Generators • From the junction box, route power supply wires through approved conduit to either (a) double-pole, double-throw transfer switch, or (b) approved isola- tion receptacle. Connecting to a transfer switch or isolation receptacle must prevent vehicle electrical circuits from being connected to two different power supplies at the same time (such as generator and...
6.8.2 BATTERY CABLES Using battery cables that are too long or too small in diameter may cause a drop in voltage, which causes starting problems. For the best cold weather starting, the voltage drop between battery terminals and the gen- erator connection point should not exceed 0.12 volts per 100 amperes of cranking current.
Section 6 – Installation PRIMEPACT 66G and 66LP Recreational Vehicle Generators CABLE LENGTH in Feet (meters) 0 to 10 (0 to 3) 11 to 15 (3.4 to 4.5) 16 to 20 (4.5 to 6) *For warm weather, use No. 2 cable up to 20 feet. 6.8.3 BATTERY CABLE CONNECTIONS 1.
POST INSTALLATION TESTS The air-cooled generator set was factory tested and adjusted. You should not be required to adjust the unit any further except under special circumstances. Do not make any unnecessary adjustments. Factory settings are correct for most applications. When making adjustments, however, be careful to avoid overspeeding the engine.
Section 7 – Post Installation PRIMEPACT 66G and 66LP Recreational Vehicle Generators INSTALLATION CHECKLIST LOCATION AND SUPPORT ❑ Generator is properly located. ❑ Generator is properly supported. ❑ Generator is properly restrained. GENERATOR COMPARTMENT ❑ Compartment construction is proper. ❑ Holes/Openings are vapor-sealed. ❑...
Section 10 — Exploded Views and Parts Lists PRIMEPACT 66G and 66LP Recreational Vehicle Generators Sheet Metal – Drawing No. 0D3150-A 40 Generac Power Systems, Inc. ®...
Page 44
Section 10 — Exploded Views and Parts Lists PRIMEPACT 66G and 66LP Recreational Vehicle Generators Base and Pulleys – Drawing No. 0D3151-A TO ENGINE 42 Generac Power Systems, Inc. ®...
Page 45
ITEM PART NO. QTY. DESCRIPTION 086318 BASE, MOUNTING 090141 GROUND CABLE 046911 MOUNT VIBR 1.50X1.38 X 3/8-16) 025017 SCREW HHC 3/8-16 X 1/2 G5 046526 WASHER LOCK M10 022129 WASHER LOCK M8-5/16 072391 SKID, RUBBER MOUNT 077603 SAFETY BOLT 5/16-18 x 3 1/2" 022259 NUT HEX 5/16-18 STEEL 052858...
Page 46
Section 10 — Exploded Views and Parts Lists PRIMEPACT 66G and 66LP Recreational Vehicle Generators Base and Pulleys – Drawing No. 0D3154-A TO ENGINE 44 Generac Power Systems, Inc. ®...
Page 48
Section 10 — Exploded Views and Parts Lists PRIMEPACT 66G and 66LP Recreational Vehicle Generators Alternator and Control Panel – Drawing No. 0D3149-C 46 Generac Power Systems, Inc. ® TO ENGINE GROUND 40 63 2,53...
Page 50
Section 10 — Exploded Views and Parts Lists PRIMEPACT 66G and 66LP Recreational Vehicle Generators Exploded View - Engine Common Parts – Drawing No. 079216-G 48 Generac Power Systems, Inc. ®...
Page 51
ITEM PART NO. QTY. DESCRIPTION 069331 CYLINDER ASSEMBLY 069333 SLEEVE BEARING 067805 OIL SEAL 0851100101 NO. 1 CYLINDER HEAD ASSEMBLY 0851100102 NO. 2 CYLINDER HEAD ASSEMBLY 070169 SEALING WASHER 069332 CYLINDER HEAD GASKET 0851100104 BREATHER ASSEMBLY 072315 BREATHER GASKET 089967 BREATHER SCREW 070596 BREATHER TUBE...
Page 52
Section 10 — Exploded Views and Parts Lists PRIMEPACT 66G and 66LP Recreational Vehicle Generators Carburetor – Drawing No. 093753-H 50 Generac Power Systems, Inc. ®...
Warranty (ECS Warranty), which is provided to you by Generac pursuant to California and federal law. See also the “Generac Limited Warranties for Generac Power Systems, Inc.,” which is enclosed herewith on a separate sheet, also provided to you by Generac. The ECS Warranty applies only to the emission control system of your new engine. If there is any conflict in terms between the ECS Warranty and the Generac Warranty, the ECS Warranty shall apply except in circumstances where the Generac Warranty may provide a longer warranty period.
Emission Control System Warranty (ECS Warranty) for 1997 and later model year engines: (a) Applicability: This warranty shall apply to 1997 and later model year engines. The ECS Warranty Period shall begin on the date the new engine or equipment is purchased by/delivered to its original, end-use purchaser/owner and shall contin- ue for 24 consecutive months thereafter.
Page 60
GENERAC POWER SYSTEMS’ THREE-YEAR LIMITED WARRANTY NOTE: ALL UNITS MUST BE INSTALLED BY GENERAC POWER SYSTEMS AUTHORIZED SERVICE FACILITIES. For a period of 3 (three) years or 2,000 (two thousand) hours of operation from the date of original sale, whichever occurs first, Generac Power Systems, Inc.