Generac NP-50LP Generator Set

⚠ Avoid overspeeding the engine.

Tools: Pliers, Wrench

1. Loosen governor clamp bolt.
2. Push spring end of governor lever clockwise to wide open throttle position.
3. Hold governor lever at wide open throttle. With pliers, rotate governor shaft fully counterclockwise.
4. While holding shaft fully clockwise and lever at wide open throttle, tighten governor clamp bolt to 70 inch-pounds (8 N-m).
5. Start engine, let it stabilize and warm up at no-load.
6. Turn adjuster nut to obtain frequency reading of 62 Hertz.
7. Check governor spring location in slot of governor lever. Move spring down one slot for excessive droop; up one slot for greater stability.
8. After repositioning spring, recheck frequency and readjust adjuster nut if necessary.
9. Check AC voltage reading. If incorrect, voltage regulator may require adjustment.

⚠ Avoid overspeeding the engine.

Tools: Screwdriver, Wrench

1. Loosen governor clamp nut.
2. Push spring end of governor lever all the way up to wide open throttle position.
3. Hold governor lever at wide open throttle. Insert screwdriver into slotted end of governor shaft. Rotate governor shaft fully counterclockwise.
4. While holding governor shaft fully counterclockwise and lever at wide open throttle, tighten governor clamp nut to 70 inch-pounds (8 N-m).
5. Start engine, let it stabilize and warm up at no-load.
6. Turn adjuster nut to obtain frequency reading of 62 Hertz.
7. Check governor spring location. Move spring left on bracket teeth for excessive droop; right for greater stability.
8. After repositioning spring, recheck frequency and readjust adjuster nut if necessary.
9. Check AC voltage reading. If incorrect, voltage regulator may require adjustment.

Tools: pliers

1. Loosen governor clamp bolt.
2. Push spring end of governor lever clockwise to wide open throttle position of lever.
3. Hold governor lever at wide open throttle and, with pliers, rotate governor shaft fully counterclockwise.
4. While holding governor shaft fully clockwise and governor lever at wide open throttle, tighten governor clamp bolt to 70 inch-pounds (8 N-m).
5. Start engine; let it stabilize and warm up at no-load.
6. Turn adjuster nut to obtain a frequency reading of 62 Hertz.
7. Check governor spring location in slot of governor lever.
8. If droop is excessive, move governor spring down one slot on lever.
9. For greater stability, move governor spring up one slot on lever.
10. Recheck frequency reading; readjust adjuster nut if necessary to obtain 62 Hertz at no-load.
11. When frequency is correct at no-load, check AC voltage; voltage regulator may require adjustment.

Tools: screwdriver

1. With engine stopped, inspect anti-lash spring. Replace if broken or damaged; attach if disconnected.
2. Loosen governor clamp nut.
3. Push spring end of governor lever all the way up to wide open throttle position.
4. Hold governor lever at wide open throttle and insert screwdriver into slotted end of governor shaft.
5. Rotate governor shaft fully counterclockwise (CCW).
6. While holding shaft fully counterclockwise and lever at wide open throttle, tighten governor clamp nut to 70 inch-pounds (8 N-m).
7. Start engine; let it stabilize and warm up at no-load.
8. Turn adjuster nut to obtain a frequency reading of 62 Hertz.
9. Check governor spring location in notched teeth of governor adjustment bracket.
10. If droop is excessive, move governor spring to the left on notched teeth of bracket.
11. For greater stability, move governor spring to the right on notched teeth of bracket.
12. Recheck frequency reading; readjust adjuster nut if necessary to obtain 62 Hertz at no-load.
13. When frequency is correct at no-load, check AC voltage; voltage regulator may require adjustment.

Tools: screwdriver

1. Remove generator control panel cover and front panel.
2. With frequency at 62 Hertz, AC voltage should read 124 volts.
3. If voltage is incorrect, slowly turn VOLTAGE ADJUST POT on voltage regulator until AC voltage is correct.

Tools: AC voltmeter, AC frequency meter

1. Connect an accurate AC voltmeter and AC frequency meter across generator AC output leads.
2. With generator running, stabilized, and warm, check AC frequency and voltage. Frequency should be about 62 Hz; voltage about 122-126 volts AC.
3. If frequency is high or low, adjust engine governor to obtain 62 Hertz at no-load; then recheck voltage reading.
4. If frequency is good but voltage is high or low, adjust voltage regulator to obtain 124 volts at 62 Hz no-load.

⚠ Do not use any flame to test for leaks.

⚠ No leakage is permitted.

Tools: separate 12 volts DC source, soap and water or equivalent solution

1. Use a separate source of 12 volts DC to open the gaseous fuel solenoid valve.
2. Test all connections, hoses, valves, regulators, fittings, and other fuel system parts under gas or air pressure of not less than 90 psi (620 kPa).
3. Use soap and water or equivalent solution to check for leaks.
4. Do not use any flame to test for leaks.
5. Comply with NFPA Paragraph 318.

⚠ Do not use any flame to test for leaks.

Tools: Soap and water solution, 12 volts DC source

1. Do not place generator into service until gas system properly tested for leaks.
2. Use separate source of 12 volts DC to open gaseous fuel solenoid valve.
3. Test all connections, hoses, valves, regulators, fittings under gas or air pressure of not less than 90 psi (620kPa).
4. Use soap and water or equivalent solution to check for leaks.
5. Do not use any flame to test for leaks.

Tools: AC frequency meter

1. Apply electrical loads equal to about 75-100% of unit's rated wattage/amperage capacity.
2. Check frequency with electrical load applied; frequency should not drop below about 58 Hz under load.
3. Let unit run at least 30 minutes with load applied; check unit is not running excessively hot and adequate cooling air flow is available.
4. Do not allow unit to overheat during prolonged operation.

1. Connect battery cable from battery POSITIVE, POS or (+) post to large lug on starter contactor.
2. Connect battery cable from battery NEGATIVE, NEG or (-) post to frame ground connection.
3. Connect cables so connectors are clean and tight. Check battery cable boot for starter cable has been installed.

⚠ Units reconnected for 120/240 volts dual voltage output will not be listed per RVIA.

⚠ Not applicable to Q-40G model.

1. Remove generator cover and front panel.
2. Disconnect stator leads 11 and 33, T1 (red) and T3 (black) from main circuit breakers CB1 and CB2.
3. Set aside leads T1 (red) and T3 (black) for later use.
4. Disconnect stator leads 11 and 33 from 4-tab terminal connector (TC).
5. Disconnect stator leads 22 and 44 from grounding terminal (GT).
6. Disconnect one of the two T2 (white) leads from grounding terminal.
7. Remove existing circuit breakers CB1 and CB2; install new appropriately rated circuit breaker.
8. Connect stator leads 11 and 44 to new circuit breaker; attach leads T1 (red) and T3 (black).
9. Connect stator leads 22 and 33 to grounding terminal (GT).
10. Be sure a neutral lead is installed and routed from grounding terminal for connection loads.
11. Route leads T1 (red), T3 (black), and grounded neutral lead through conduit clamp and out of panel.
12. Reassemble panel and generator cover.

⚠ Units reconnected for 120/240 volts dual voltage output will not be listed per RVIA.

⚠ Not applicable to Q-40G model.

Tools: Screwdriver, Pliers

1. Gain access to generator panel interior by removing generator cover and front panel.
2. Disconnect stator leads 11 and 33, T1 (red) and T3 (black) from main circuit breakers CB1 and CB2. Set aside T1 and T3.
3. Disconnect stator leads 11 and 33 from the 4-tab terminal connector (TC).
4. Disconnect stator leads 22 and 44 from the grounding terminal (GT).
5. Disconnect one of the two T2 (white) leads from the grounding terminal.
6. Remove existing circuit breakers CB1 and CB2. Install new appropriately rated circuit breaker.
7. Connect stator leads 11 and 44 to new circuit breaker. Attach leads T1 (red) and T3 (black) to circuit breaker.
8. Connect stator leads 22 and 33 to grounding terminal (GT).
9. Be sure a neutral lead is installed and routed from grounding terminal for connection loads.
10. Route leads T1 and T3 and grounded neutral lead through conduit clamp and out of panel.
11. Reassemble panel and generator cover.
12. Loads may be connected: T3 to Neutral 120 volts; T1 to Neutral 120 volts; T1 to T3 240 volts.