Service parts for the 125REZGC
Grouped by system, with how many of each the parts manual calls for.
Oil system
1 requiredPrices 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 | 4T13X |
| Phase | 3 |
Engine
| Oil capacity | 7.6 L |
|---|---|
| Coolant capacity | 13.7 L |
| Displacement | 8.8 L |
| Aspiration | Turbo Charge Air Cooled |
| Rated speed | 1800 rpm |
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 | ||
| 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.
Which alternator is fitted to the Kohler 125REZGC?
The Kohler 125REZGC uses a 4T13X 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 | Air filter | Amazon eBay |
| GM19721 | Gasket, exhaust manifold | 2 | Gasket | Amazon |
| GM62308 | Air Cleaner Assy | 1 | Air filter | Amazon eBay |
| GM62309 | Element, air cleaner | 1 | Oil filter | Amazon eBay $91.00 |
| GM69285 | Hose, Air Intake | 1 | Hose | Amazon eBay |
| GM87592 | Oil filter | 1 | Oil filter | Amazon eBay $37.50 |
| GM87608 | Spark plug | 8 | Oil filter | 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
Spec sheet (Kohler)Reference (Kohler)Reference — G6-39 0918AZ (Kohler)Reference — Kohler-Gas Generators Brochure (Kohler)Reference — vertical circulator plug in Kohler. G6171 (Kohler)Service manual — cold weather kit tt1723 (Kohler)Service manual — tp6799 (Kohler)Service manual — tt1723 (Kohler)