jamespjackson95 wrote:
Same thing with the generator today... Thing ran great for about 30 mins to an hour then just shut off... Seems pretty hot... Will start up for about 5-10 seconds then die... Fault code 37. Any advice.
Well, there is no overheat shut down on a Onan 5500. If it shuts down from overheat, its an engine seize up, which is very doubtful.My 5500 gets so hot you can't hardly touch the breakers in the engine compartment, and it doesn't shut down even in 117° Az summer heat. Thats why its very important to keep good fresh high quality oil in your Onan. It only takes 2 quarts...
Here is the manual troubleshooting for fault code 37. But keep in mind if the carb is holding back the engine, it can cause this fault code also... I'd monitor the voltage/Hz, and note these values right before it shuts down...
"INVALID SET CONFIGURATION – FAULT CODE 37
Logic: Configuration is determined by ratio of quadrature frequency / ignition speed
Possible Causes: Wire connections, windings, ignition system, drive belt slippage, generator drive system
Diagnosis & Repair: 1. Verify that Last Fault is FC 37: Yes, continue diagnosis; No, troubleshoot actual last fault. 2. Alternating FC 37 and FC 47: Magneto gap to wide: reset magneto gap, retest. 3. HGJAD only – Run genset in Engine Run Only and externally excite field with 12 VDC or 24 VDC and measure main and quadrature winding AC output. 4. Non EFI only – If the genset will not stay running measure genset frequency, quadrature winding and main winding voltages using Break-Out Tool 420–0603 and Instruction Sheet R1098. 5. Measure AC frequency while changing engine rpm to determine if frequency response matches engine rpm response: repair damaged generator drive system as necessary. 6. Measure field, quadrature and main winding resistance: clean slip rings, replace brushes, repair harness and replace rotor or stator as necessary. 7. Measure field, quadrature and main winding resistance to ground: clean slip rings, replace brushes, repair harness and replace rotor or stator as necessary. 8. Measure field, quadrature and main winding resistance to each other: clean slip rings, replace brushes, repair harness and replace rotor or stator as necessary. 9. Check brush alignment per PSB-682a. 10. Verify that spark plug cables are secure on spark plugs: reconnect or replace as necessary. 11. Inspect ignition kill leads in harness and at connector P1: repair or replace lead, terminal or pins as necessary. 12. Test Magnetos A. Disconnect Connector P1. B. Connect positive(+) meter lead to chassis ground. C. HGJAA, D, E, F – Measure continuity to negative lead at pin P1–4 and P1–5: replace magnetos as necessary. D. HGJAB, C – Measure continuity to negative lead at pin P1–15 and P1–20: replace magnetos as necessary. 13. Measure spark plug gap: set gap or replace spark plugs as necessary. 14. Verify ignition spark condition. 15. Inspect spark plug lead, kill lead terminal at magneto and measure magneto air gap: replace terminals, set gap or replace magnetos as necessary. 16."
