Service parts for the 125REZGC
Grouped by system, with how many of each the parts manual calls for.
Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | natural gas / LP |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 128 kW |
| Standby kVA | 160 |
| Prime power | 106 kW |
| Oil capacity | 7.6 L |
| Alternator | 4R13X |
| Voltage options | 480 V |
| Phase | 3 |
| Coolant capacity | 27.6 L |
| Engine jacket water | 13.4 L |
Engine
| Oil capacity | 7.6 L |
|---|---|
| Coolant capacity | 13.7 L |
| Displacement | 8.8 L |
| Aspiration | Turbo Charge Air Cooled |
| Rated speed | 1800 rpm |
Same engine, other brands
1 brandThe Power Solutions International 8.8L Industrial Powertrain in this set also powers 1 generator set sold under 1 other brand. Service parts and maintenance intervals for the engine are shared; enclosure, alternator, controller and ratings are not.
| Brand | Models |
|---|---|
| Cummins/Onan | GFPA |
Maintenance & consumables
for the Power Solutions International 8.8L Industrial Powertrain| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Oil filter | Oil filter | GM87592 | Amazon eBay $37.50 NAPA $9.64 | ||
| Coolant | Closed-Loop Radiator System | 49.2 L | — | ||
| Oil | Full Pressure Lubrication | 8.5 L | — |
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
What is the power rating of the Kohler 125REZGC?
The Kohler 125REZGC is rated 128 kW standby (160.0 kVA).
What engine does the Kohler 125REZGC use?
The Kohler 125REZGC is powered by the Power Solutions International 8.8L Industrial Powertrain engine.
What kind of fuel does the Kohler 125REZGC run on?
The Kohler 125REZGC runs on natural gas / LP.
What is the oil capacity of the Kohler 125REZGC?
The Power Solutions International 8.8L Industrial Powertrain engine in the Kohler 125REZGC has an oil capacity of 7.6 liters.
How much coolant does the Kohler 125REZGC hold?
The Kohler 125REZGC cooling system holds 27.6 liters (7.3 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the prime power rating of the Kohler 125REZGC?
The Kohler 125REZGC is rated 106 kW prime (133 kVA), against 128 kW standby.
What voltages is the Kohler 125REZGC available in?
The Kohler 125REZGC is offered in 480 V, 3-phase.
Which alternator is fitted to the Kohler 125REZGC?
The Kohler 125REZGC uses a 4R13X alternator.
What oil filter fits the Kohler 125REZGC?
The Kohler 125REZGC uses oil filter part number GM87592.
Parts
10| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 273113 | Gasket–Intake | 1 | Sensor | Amazon eBay |
| GM19721 | Gasket, exhaust manifold | 2 | Gasket | Amazon |
| GM62308 | Air Cleaner Assy | 1 | Air filter | Amazon eBay |
| GM62309 | Element, air cleaner | 1 | Air filter | Amazon eBay $91.00 |
| GM69285 | Hose, Air Intake | 1 | Hose | Amazon eBay |
| GM87592 | Oil filter | 1 | Oil filter | Amazon eBay $37.50 NAPA $9.64 |
| GM87608 | Spark plug | 8 | Spark plug | Amazon eBay $60.00 |
| GM92063-S | Maintenance Kit | Maintenance kit | Amazon eBay | |
| GM92099-S | Maintenance Kit | Maintenance kit | Amazon eBay | |
| GM101824 | 5.7L breather retrofit kit (not fully specified) | 1 | Service part / kit | Amazon eBay |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Available documents
This page was generated from the 8 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.