The 1987 Onan Generator Repair Manual provides comprehensive technical documentation for servicing and maintaining Onan generators from the 1987 model year. This manual covers troubleshooting procedures, repair instructions, parts identification, electrical schematics, and maintenance schedules for various Onan generator models including the Emerald, Marquis, and Commercial series. Below are key sections for safety procedures, technical specifications, repair procedures, parts diagrams, and troubleshooting guides.
Critical safety procedures for working on 1987 Onan generators.
| Hazard | Safety Procedure |
|---|---|
| Electrical Shock | Disconnect battery and generator output before servicing |
| Fuel Fire | Work in well-ventilated area; no smoking or open flames |
| Moving Parts | Ensure generator is completely stopped before inspection |
| Hot Surfaces | Allow engine to cool before performing maintenance |
| Battery Acid | Wear protective gloves and eyewear when handling batteries |
Identifying your specific 1987 Onan generator model for proper repair procedures.
WARNING! Using incorrect repair procedures for your specific model can cause equipment damage and void warranties.
Detailed specifications for 1987 Onan generator models.
Scheduled maintenance procedures for optimal generator performance.
Daily: Visual inspection for leaks, check oil level, verify coolant level
Monthly: Test run under load, check battery charge, inspect air filter
Annual: Change oil and filter, replace spark plugs, clean fuel system, test voltage output
Maintenance: Oil change intervals (100 hours/annually), air filter inspection (50 hours), spark plug replacement (500 hours), valve adjustment (1000 hours).
Step-by-step engine repair procedures for 1987 Onan generators.
Tip: Always use genuine Onan replacement parts for optimal performance.
Electrical system diagnosis and repair for 1987 Onan generators.
WARNING! High voltage present even when engine is not running. Always discharge capacitors before servicing.
Fuel system maintenance and repair procedures.
Carburetor: Float level adjustment, main jet cleaning, choke mechanism service
Fuel Pump: Pressure testing (2.5-4.5 PSI), diaphragm replacement
Fuel Filter: Replace annually or every 200 hours
LP/NG Systems: Regulator adjustment, gas valve servicing, leak testing
Exploded view diagrams with part numbers for 1987 Onan generators.
| Assembly | Diagram Reference | Common Replacement Parts |
|---|---|---|
| Engine | Fig. 1-5 | Pistons, rings, bearings, gaskets |
| Fuel System | Fig. 6-8 | Carburetor kits, fuel pumps, filters |
| Electrical | Fig. 9-12 | Voltage regulators, rotors, stators |
| Control Panel | Fig. 13-15 | Switches, meters, circuit breakers |
Common problems and solutions for 1987 Onan generators.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Engine cranks but won't start | Fuel delivery, spark, compression | Check fuel flow, test spark plugs, verify compression |
| No output voltage | Excitation failure, rotor issues | Flash field, test rotor resistance, check brushes |
| Engine runs rough | Carburetion, ignition timing | Clean carburetor, adjust timing, check valves |
| Overheating | Cooling system, overloading | Clean cooling fins, check thermostat, reduce load |
| Battery not charging | Alternator, regulator, wiring | Test alternator output, check regulator, inspect wiring |
Reset: Manual reset circuit breakers on control panel.
Service Support: Contact Onan technical support for factory assistance.