Service parts for the 350REZX
Grouped by system, with how many of each the parts manual calls for.
Electrical
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | Natural Gas |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 350 kW |
| Standby kVA | 444 |
| Prime power | 300 kW |
| Emissions | EPA-Certified |
| Controller | APM402, APM603 |
| Oil capacity | 42.1 L |
| Alternator | 4M4019 (4-pole, Class Class H insulation) |
| Voltage options | 480 V |
| Phase | 3 |
| Rated current | 421 A |
| Power factor | 1 |
| Circuit breaker | 60 A |
| Battery group | 31 |
| Battery cranking | 950 CCA |
| Battery voltage | 12 V |
| Battery quantity | 2 |
| Coolant capacity | 177.0 L |
| Engine jacket water | 42.0 L |
| Max ambient | 50 °C |
| Dimensions (L×W×H) | 6365×2252×2695 mm |
| Dry weight | 3900 kg |
| Sound level | 69.0 dBA @ 23 m |
| Fuel tank | 0.0 L |
| Tank runtime | 10 hr |
Engine
| Oil capacity | 42.1 L |
|---|---|
| Coolant capacity | 50.0 L |
| Displacement | 18.273 L |
| Aspiration | Turbocharged, Charge Air-Cooled |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the Doosan D183TIC| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Dry | — | |||
| Fuel filter | N/A | — | |||
| Oil filter | Cartridge | ×2 | — | 93 hr | |
| Battery | 2x 12V wet-charged starting batteries, BCI Group 31, 950 CCA | 324586 | Amazon eBay | ||
| Belt | N/A | — | 24 hr | ||
| Coolant | Water-Cooled | — | |||
| Oil | Full Pressure | — | |||
| Spark plug | N/A | — |
Service intervals
1| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| engine oil filters | Check | 93 hr | last changed 12/18/2025 |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Service specifications
30| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Other | 10 in. weld flange bolt circle diameter B | 361.95 | mm (14.25 in.) | |
| Other | 10 in. weld flange outside diameter C | 406.4 | mm (16.0 in.) | |
| Other | 10 in. weld flange quantity of bolts / bolt hole diameter D | 12, 25.40 | mm (1.00 in.) | |
| Other | 12 in. weld flange bolt circle diameter B | 431.80 | mm (17.00 in.) | |
| Other | 12 in. weld flange outside diameter C | 482.6 | mm (19.0 in.) | |
| Other | 12 in. weld flange quantity of bolts / bolt hole diameter D | 12, 25.40 | mm (1.00 in.) | |
| Other | 14 in. weld flange bolt circle diameter B | 476.25 | mm (18.75 in.) | |
| Other | 14 in. weld flange outside diameter C | 533.4 | mm (21.0 in.) | |
| Other | 14 in. weld flange quantity of bolts / bolt hole diameter D | 12, 28.58 | mm (1.13 in.) | |
| Other | 16 in. weld flange bolt circle diameter B | 539.75 | mm (21.25 in.) | |
| Other | 16 in. weld flange outside diameter C | 596.9 | mm (23.5 in.) | |
| Other | 16 in. weld flange quantity of bolts / bolt hole diameter D | 16, 28.58 | mm (1.13 in.) | |
| Other | 18 in. weld flange bolt circle diameter B | 577.85 | mm (22.75 in.) | |
| Other | 18 in. weld flange outside diameter C | 635.0 | mm (25.0 in.) | |
| Other | 18 in. weld flange quantity of bolts / bolt hole diameter D | 16, 31.75 | mm (1.25 in.) | |
| Other | 20 in. weld flange bolt circle diameter B | 635.00 | mm (25.00 in.) | |
| Other | 20 in. weld flange outside diameter C | 698.5 | mm (27.5 in.) | |
| Other | 20 in. weld flange quantity of bolts / bolt hole diameter D | 20, 31.75 | mm (1.25 in.) | |
| Other | 5 in. weld flange bolt circle diameter B | 215.90 | mm (8.50 in.) | |
| Other | 5 in. weld flange outside diameter C | 241.30 | mm (9.50 in.) | |
| Other | 5 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | 6 in. weld flange bolt circle diameter B | 254.0 | mm (10.0 in.) | |
| Other | 6 in. weld flange outside diameter C | 279.4 | mm (11.0 in.) | |
| Other | 6 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | 8 in. weld flange bolt circle diameter B | 298.45 | mm (11.75 in.) | |
| Other | 8 in. weld flange outside diameter C | 342.9 | mm (13.5 in.) | |
| Other | 8 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | Weld flange angle A (10, 12, 14 in. nominal pipe size) | 30 | deg. | |
| Other | Weld flange angle A (16, 18, 20 in. nominal pipe size) | 22.5 | deg. | |
| Other | Weld flange angle A (5, 6, 8 in. nominal pipe size) | 45 | deg. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
11 Hour Load Bank 100% load test
Tools: load bank
- Run genset at 100% load for 1 hour load bank test.
- Readings of load steps taken after load application.
- Exhaust temp reading location: 90 aft of turbine exhaust housing.
- Record KW, load %, Hz, load amps, voltage, water temp, oil pressure, exhaust temp, gas pressure, ambient temp, time and hour meter.
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Voltage reconnection
| Voltage | Phase | Connection | Leads | Notes |
|---|---|---|---|---|
| 12-lead optional voltage connections | 12 | Alternator optional feature | ||
| 4-lead dedicated voltages | 4 | Alternator standard feature | ||
| 110/127/139/240/254/277 | single-phase | switchable | Towable generator model specifications; some models n/a | |
| 208/220/240/415/440/480 | 3-phase | reconnectable | Towable generator model specifications | |
| 208/220/240/415/440/480 | 3-phase | switchable | Towable generator model specifications |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Common questions
What size generator is the Kohler 350REZX?
The Kohler 350REZX is rated 350 kW standby (444.0 kVA).
What engine is in the Kohler 350REZX?
The Kohler 350REZX is powered by the Doosan D183TIC engine.
What fuel type does the Kohler 350REZX take?
The Kohler 350REZX runs on Natural Gas.
How much oil does the Kohler 350REZX take?
The Doosan D183TIC engine in the Kohler 350REZX has an oil capacity of 42.1 liters.
What is the cooling system capacity of the Kohler 350REZX?
The Kohler 350REZX cooling system holds 177 liters (46.8 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the prime power rating of the Kohler 350REZX?
The Kohler 350REZX is rated 300 kW prime (375 kVA), against 350 kW standby.
How loud is the Kohler 350REZX?
The Kohler 350REZX is rated at 69.0 dBA at 23 m, per the manufacturer specification sheet.
How much does the Kohler 350REZX weigh?
The Kohler 350REZX has a dry weight of 3900 kg (8598 lb).
What voltages is the Kohler 350REZX available in?
The Kohler 350REZX is offered in 480 V, 3-phase.
How many cold cranking amps does the Kohler 350REZX require?
The Kohler 350REZX uses 2 batteryies, 12 V each, 950 CCA, group 31, per the manufacturer specification sheet.
What alternator comes on the Kohler 350REZX?
The Kohler 350REZX uses a 4M4019 alternator. It has 4 poles. Insulation class Class H.
Repair guides
1Step-by-step procedures compiled from the Kohler service manual for this model.
Parts
6model family| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 300REZXD | 300 KW L.P./N.G. GENSET | 1 | Service part / kit | Amazon eBay |
| 350EOZCS | 350 KW DIESEL COMMERCIAL MARINE GENSET | 1 | Service part / kit | Amazon eBay |
| 350REZXD | 350 KW L.P./N.G. GENSET | 1 | Service part / kit | Amazon eBay |
| 400REOZJC | 400 KW DIESEL GENSET | 1 | Service part / kit | Amazon eBay $1799.95 |
| 500REOZJC | 500 KW DIESEL GENSET | 1 | Service part / kit | Amazon eBay $1799.95 |
| KG80R | 80 kW L.P./N.G. Genset | 1 | Service part / kit | Amazon eBay |
Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | 25% | 446.0 | 12.6 |
| Prime | 50% | 701.0 | 19.9 |
| Prime | 75% | 979.0 | 27.7 |
| Prime | 100% | 1289.0 | 36.5 |
| Standby | 25% | 446.0 | 12.6 |
| Standby | 50% | 75.33 | 19.9 |
| Standby | 75% | 979.0 | 27.7 |
| Standby | 100% | 1289.0 | 36.5 |
Available documents
This page was generated from the 15 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.