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General| Brand | Onan |
|---|---|
| Model | NHE |
| Category | Portable Generator |
| Language | English |
Lists hazards like electrical shock, burns, poisonous gases, and moving parts.
Emphasizes proper procedures, avoiding loose clothing, and using correct tools.
Procedures for removing and disassembling the starter.
Testing for grounds, opens, and shorts using various tools.
How to inspect and measure starter brushes for wear.
Steps for assembling the starter components.
Steps for reassembling the return spring if it was disassembled.
Details regarding updates included in this supplement.
How to adjust the throttle stop screw for idle speed.
How to adjust idle and main fuel mixture screws.
How to adjust the carburetor float level.
Information about the manual's scope and intended audience.
How to identify the generator set model number.
Emphasizes the need for qualified personnel for service.
Procedures for locating and isolating problems.
List of special tools required for service.
General safety advice and precautions for servicing.
Specific actions to prevent injury and ensure safety.
Advice on safe work habits and accident preparedness.
Procedure for purging LP gas from the fuel system.
Steps for disconnecting and removing a compartment-mounted generator set.
Warnings about engine damage from tilting and injury from dropping.
Steps for partial and complete removal of the underfloor mounted set.
Overview of engine primary systems covered in the section.
Guide for diagnosing engine primary system malfunctions.
Details on exhaust system for compartment-mounted sets.
Steps for disassembling the compartment mount exhaust system.
Steps for assembling the exhaust system.
Details on exhaust system for underfloor-mounted sets.
Steps for disassembling the underfloor mount exhaust system.
Steps for assembling the underfloor mount exhaust system.
Guidelines for selecting and locating tailpipes.
Information on cooling airflow and associated hazards.
Steps for disassembling the cooling system.
Information on breaker points and condenser function.
How to replace and adjust breaker points.
Information and testing procedures for the ignition coil.
Spark plug conditions and ignition wiring checks.
Procedure for servicing the crankcase breather.
Steps for adjusting governor speed and sensitivity.
Components and disassembly of the air filter assembly.
Components and disassembly of carburetor/intake manifold.
How to adjust carburetor mixture screws for optimal performance.
Description of the choke system and associated heat hazard.
How to adjust the choke settings for ambient temperatures.
Warning against using non-standard electric fuel pumps.
Procedure to test the fuel pump outlet pressure.
Fuel pump repair procedures and testing for different models.
Information on LP-gas fuel systems, pressure, and purging.
Procedure to purge LP gas and associated fire/explosion hazards.
Steps for removing carburetor, air filter, and intake manifold.
How to adjust mixture screws for LP gas carburetors.
Warning about damaging carburetor screws during adjustment.
Steps for LP gas carburetor disassembly, cleaning, and reassembly.
Information on regulator operation and maintenance after storage.
Procedure to test the LP gas regulator.
Steps for disassembling the fuel filter.
Information on the solenoid valve and its service limitations.
Overview of the generator set control system.
Description of components in the NHE generator set control.
Description of the printed circuit board assembly.
Description of control switch, solenoid, resistor, and remote start.
Description of how the NHE control system operates.
Step-by-step description of the generator set starting sequence.
Description of the starter lock-out and run sequence.
Description of the generator set stopping sequence.
Troubleshooting steps for when the engine does not crank.
Troubleshooting steps for engine crank but no start.
Troubleshooting steps for engine starting and stopping issues.
Troubleshooting steps for engine stopping or restarting issues.
Troubleshooting steps for low battery conditions.
Troubleshooting for run lamp, time meter, or battery meter issues.
Description of NHEL control components like stop relay and diode.
Step-by-step description of the NHEL starting sequence.
Description of the NHEL starter lock-out and run sequence.
Description of the NHEL generator set stopping sequence.
Troubleshooting steps for NHEL engine not cranking.
Troubleshooting for NHEL engine crank but no start.
Troubleshooting for NHEL engine start/stop issues.
Troubleshooting for NHEL engine stopping or restarting issues.
Troubleshooting steps for NHEL low battery conditions.
Troubleshooting for NHEL meter or lamp operation issues.
Introduction to the generator and description of its main components.
Description of how the generator operates.
Details on generator operation including voltage build-up and regulation.
Guide to troubleshooting generator problems.
Troubleshooting steps for no AC output voltage.
Troubleshooting for AC output voltage that is too low or too high.
Troubleshooting steps for a noisy generator.
Troubleshooting steps for a generator that overheats.
Procedures for disassembling the generator set.
Steps for removing the generator rotor and stator.
Procedures for reassembling the generator components.
Procedure for replacing generator brushes.
Procedure for servicing generator slip rings.
Procedures for adjusting generator output voltage.
Procedures to test generator field voltage and rotor windings.
Procedure for testing stator and transformer for grounds.
Procedures for testing stator and transformer for open or shorted windings.
Procedure to test the CR4 bridge rectifier.
Overview of engine block assembly components.
Procedures for removing and installing the oil filter and adapter.
Procedures for cylinder head service and warpage hazard.
Inspection of valve system components and asbestos gasket hazard.
Procedures for reconditioning valves and valve seats.
Procedures for valve guide and seat replacement.
Procedures for adjusting valve tappets for proper clearance.
Procedures for removing and installing the gear cover.
Procedures for removing and installing the governor cup.
Procedures for timing gears and camshaft replacement.
Description and service procedures for the oil pump and by-pass valve.
Procedures for removing, disassembling, and inspecting piston assemblies.
Warnings about hazards during piston removal and ridge reaming.
Inspecting pistons and checking ring land clearance.
Warning about damage from improper piston cleaning solvents.
Procedures for inspecting connecting rods, piston pins, and bearings.
How to measure piston clearance and fit new piston rings.
Procedures for installing piston assemblies into cylinders.
Procedures for measuring rod bearing clearance using Plasti-Gage.
Procedures for inspecting and installing the crankshaft.
Procedures for checking crankshaft endplay.
The cylinder block as the main support for engine parts.
Procedures for cleaning and inspecting the cylinder block for damage.
Inspecting cylinder bores for wear, taper, and out-of-roundness.
Procedures for reboring and honing cylinders for proper fit.
Procedures for deglazing and warnings about improper cleaning solvents.
Procedures for installing camshaft bearings.
Procedures for installing crankshaft bearings.
Procedures for replacing oil seals and associated hazard warnings.
Checks for mounting, lubrication, and wiring before operation.
Checks for initial start, output, and exhaust system safety.
Inspect fuel system for leaks and verify control functions.
Inspect mechanical parts and compartment for integrity.
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