Service parts for the 300REZX
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 | Gas |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 300 kW |
| Standby kVA | 375 |
| Prime power | 270 kW |
| Controller | APM402, APM603, Decision-Maker 550, Decision-Maker 6000 |
| Oil capacity | 42.1 L |
| Alternator | 4M4019, 4M4266 |
| Voltage options | 120/208 V, 127/220 V, 120/240 V, 139/240 V, 220/380 V, 240/416 V, 277/480 V, 347/600 V |
| Phase | 3 |
| Rated current | [728, 688, 631, 570, 452] A |
| Power factor | 0.8 |
| Battery cranking | 925 CCA |
| Battery voltage | 12 V |
| Battery quantity | 2 |
| Coolant capacity | 227.3 L |
| Max ambient | 50 °C |
| Dimensions (L×W×H) | 3500×1750×2148 mm |
| Dry weight | 3200 kg |
| Sound level | 70.0 dBA @ 23 m |
Engine
| Oil capacity | 35.0 L |
|---|---|
| Coolant capacity | 42.0 L |
| Displacement | 18.273 L |
| Aspiration | Turbocharged, Charge Air-Cooled |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the PSI/Doosan D183L| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Dry | — | |||
| Fuel filter | N/A | — | |||
| Oil filter | ×2 | — | |||
| Battery | N/A | 324586 | Amazon $16.34 eBay | ||
| Belt | N/A | — | 24 hr | ||
| Coolant | Water-Cooled | — | |||
| Oil | Full Pressure | — | |||
| Spark plug | N/A | — |
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.
Common questions
How many kW is the Kohler 300REZX?
The Kohler 300REZX is rated 300 kW standby (375.0 kVA).
Which engine powers the Kohler 300REZX?
The Kohler 300REZX is powered by the PSI/Doosan D183L engine.
Is the Kohler 300REZX diesel or gas?
The Kohler 300REZX runs on Gas.
What's the oil capacity on a Kohler 300REZX?
The PSI/Doosan D183L engine in the Kohler 300REZX has an oil capacity of 35.0 liters.
What alternator does the Kohler 300REZX use?
The Kohler 300REZX uses a 4M4019, 4M4266 alternator.
Parts
13model 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 |
| 350REOZJC | 350 KW DIESEL GENSET | 1 | Service part / kit | Amazon eBay $1799.95 |
| 350REOZJD | 350 KW DIESEL GENSET | 1 | Service part / kit | Amazon eBay $109858.00 |
| 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 |
| 400REOZJD | 400 KW DIESEL GENSET | 1 | Service part / kit | Amazon eBay $79995.00 |
| 500EOZCS | 500 KW DIESEL COMMERCIAL MARINE GENSET | 1 | Service part / kit | Amazon eBay |
| 500REOZJC | 500 KW DIESEL GENSET | 1 | Service part / kit | Amazon eBay $1799.95 |
| KD1250-4 | 1250 KW DIESEL TIER 4 GENSET | 1 | Service part / kit | Amazon eBay |
| KD1250A | 1250 kW Diesel Genset | 1 | Service part / kit | Amazon eBay |
| KG80 | 80 kW L.P./N.G. Genset | 1 | Service part / kit | Amazon eBay $39.90 |
| 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 | 100% | 939.0 | 255.25 |
| Standby | 100% | 1041.0 | 270.27 |
Available documents
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