Service parts for the 125REZG
Grouped by system, with how many of each the parts manual calls for.
Oil system
1 requiredIgnition
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | LP Gas |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 105 kW |
| Standby kVA | 115 |
| Emissions | EPA-Certified for Stationary Emergency Applications |
| Controller | 550, 6000, Decision-Maker 3+, Decision-Maker 3000, Decision-Maker 550 |
| Oil capacity | 8.0 L |
| Alternator | Fast-Response II (FRII) |
| Voltage options | 120/208 V, 127/220 V, 120/240 V, 139/240 V, 220/380 V, 277/480 V, 347/600 V, 110/190 V, 115/200 V, 110/220 V, 230/400 V, 240/416 V |
| Phase | 3 |
| Rated current | 244 A |
| Power factor | 1 |
| Battery group | 24 |
| Battery cranking | 630 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Coolant capacity | 24.2 L |
| Engine jacket water | 10.0 L |
| Max ambient | 50 °C |
| Dimensions (L×W×H) | 2400×1040×1484 mm |
| Dry weight | 1134 kg |
| Wet weight | 1450 kg |
| Sound level | 71.0 dBA @ 23 m |
Filters for the Ford 6.8L
2Engine-mounted filters the filter manufacturers list for this engine family. These come from the engine, not from this generator set’s own parts list, so confirm against your serial number before ordering.
| System | Filter | Description | Cross-references | |
|---|---|---|---|---|
| Oil filter | P550965 | Lube Filter, Spin-On Full Flow | FORD F1AE6714BC, FORD F1AZ6731A, NAPA 1372, NAPA 21372 | buy |
Listed for this engine in only one kind of machine, so they may depend on how the engine was installed:
| System | Filter | Description | Cross-references | |
|---|---|---|---|---|
| Fuel filter | P550967 | Fuel Filter, In-Line | FORD F0TE9155AA, FORD F0TZ9155B, BALDWIN BF1166, SKYJACK 142301 | buy |
Maintenance & consumables
for the Ford 6.8L| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | 400 hr | |||
| Fuel filter | — | 200 hr | |||
| Oil filter | Motorcraft | 120105 | 500 hr | Amazon eBay | |
| Battery | Cold cranking amps: 630 @ -18°C (0°F) | — | |||
| Belt | — | 400 hr | |||
| Coolant | — | ||||
| Oil | 8.5 L | — | 500 hr | ||
| Spark plug | AGSF-22F-M1 | 800 hr | Amazon eBay $4.99 |
Service specifications
60| 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. | |
| Pressure | LPG vapor withdrawal fuel supply pressure | 1.24--2.74 | kPa | |
| Pressure | Maximum allowable back pressure | 10.2 | kPa | exhaust |
| Pressure | Natural gas fuel supply pressure | 1.74--2.74 | kPa | |
| Speed | Rated rpm | 1800 | rpm | 60 Hz |
| Temperature | Ambient temperature | 50 | C | radiator system |
| Torque | 1-12 fastener | 283.0 (209) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 1-8 fastener | 259.0 (191) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 1/2-13 fastener | 60.0 (44) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 1/2-20 fastener | 66.0 (49) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 1/4-20 fastener | 6.8 (60) | Nm (in. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 1/4-28 fastener | 8.1 (72) | Nm (in. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 10-24 fastener | 2.9 (26) | Nm (in. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 10-32 fastener | 2.9 (26) | Nm (in. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 3/4-10 fastener | 199.0 (147) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 3/4-16 fastener | 222.0 (164) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 3/8-16 fastener | 24.0 (18) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 3/8-24 fastener | 27.0 (20) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 5/16-18 fastener | 13.6 (120) | Nm (in. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 5/16-24 fastener | 14.9 (132) | Nm (in. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 5/8-11 fastener | 113.0 (83) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 5/8-18 fastener | 128.0 (94) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 7/16-14 fastener | 39.0 (29) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 7/16-20 fastener | 43.0 (32) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 8-32 fastener | 1.8 (16) | Nm (in. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 9/16-12 fastener | 81.0 (60) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | 9/16-18 fastener | 91.0 (67) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 2 or 5 |
| Torque | M10 x 1.25 fastener | 31.0 (23) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 5.8 or 8.8 |
| Torque | M10 x 1.50 fastener | 30.0 (22) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 5.8 or 8.8 |
| Torque | M12 x 1.50 fastener | 56.0 (41) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 5.8 or 8.8 |
| Torque | M12 x 1.75 fastener | 53.0 (39) | Nm (ft. lb.) | Assembled into cast iron or steel, Grade 5.8 or 8.8 |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Recommended fluids
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Fuel | LP Gas | Propane 85% min, Propene 5.0% max, C4 and higher 2.5% max, LHV 67.5 MJ/m3 min | LPG vapor withdrawal fuel supply pressure 1.24--2.74 kPa (5-11 in. H2O); dual fuel LPG pressure 1.24 kPa (5 in. H2O) | ||
| Fuel | Natural Gas | Methane 90% min, Ethane 4.0% max, Propane 1.0% max, Propene 0.1% max, C4 and higher 0.3% max, Sulfur 25 ppm max, LHV 26.6 MJ/m3 min | Fuel supply pressure 1.74--2.74 kPa (7-11 in. H2O) |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
2Common Hardware Application installation
- Determine entry hole type: round or slotted.
- Determine exit hole type: fixed female thread (weld nut), round, or slotted.
- For round and slotted exit holes, determine if hardware is greater than 1/2 inch in diameter.
- Hardware greater than 1/2 inch in diameter uses a standard nut and SAE washer.
- Hardware 1/2 inch or less in diameter can use a properly torqued whiz nut or spiralock nut.
- Always use a washer between hardware and a slot.
- Always use a washer under a nut.
- Use a washer under a bolt when the female thread is fixed (weld nut).
How to Find Part Numbers operation
- Locate the generator set nameplate to identify the generator set spec number.
- Locate the second nameplate listing accessories to identify installed modules; on some models it is inside the junction box.
- Turn to the Specification Number Index; the first column lists generator set spec numbers.
- Identify the group most likely to include the service part number.
- Find the group variation number at the intersection of the spec number row and group column.
- Page forward to locate that group or find the page in the Table of Contents.
- Find the part on the illustration and note the item number, or find the part description in the parts list.
- Select the part number that corresponds to your group variation using the column on the right side of the parts list table.
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 | Alternator Reconnections diagram ADV-5875B-M (page 16) | |||
| 12-lead optional voltage connections | 12 | Alternator optional feature | ||
| 4-Lead | Alternator Reconnections diagram ADV-5875A-M (page 15) | |||
| 4-lead dedicated voltages | 4 | Alternator standard feature | ||
| 110-120/220-240 | 1 | 4 lead | 4 | 4V11 alternator |
| 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 | |
| Various | 3 | 12 lead reconnectable | 12 | 4S11 and 4S13 alternators |
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 125REZG?
The Kohler 125REZG is rated 105 kW standby (115.0 kVA).
What engine does the Kohler 125REZG use?
The Kohler 125REZG is powered by the Ford 6.8L engine.
What fuel type does the Kohler 125REZG take?
The Kohler 125REZG runs on LP Gas.
What is the coolant capacity of the Kohler 125REZG?
The Kohler 125REZG cooling system holds 24.2 liters (6.4 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the oil capacity of the Kohler 125REZG?
The Kohler 125REZG has an engine oil capacity of 8 liters (8.5 US quarts), per the manufacturer specification sheet.
What is the sound level of the Kohler 125REZG?
The Kohler 125REZG is rated at 71.0 dBA at 23 m, per the manufacturer specification sheet.
What is the dry weight of the Kohler 125REZG?
The Kohler 125REZG has a dry weight of 1134 kg (2500 lb).
What voltages is the Kohler 125REZG available in?
The Kohler 125REZG is offered in 120/208 V, 127/220 V, 120/240 V, 139/240 V, 220/380 V, 277/480 V, 3-phase.
How many cold cranking amps does the Kohler 125REZG require?
The Kohler 125REZG uses 1 battery, 12 V each, 630 CCA, group 24, per the manufacturer specification sheet.
Which alternator is fitted to the Kohler 125REZG?
The Kohler 125REZG uses a Fast-Response II (FRII) alternator.
What oil filter does the Kohler 125REZG use?
The Kohler 125REZG uses oil filter part number 120105.
Parts
1| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 120105 | Engine Oil Filter | 1 | Oil filter | 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.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Standby | 100% | 46.8 | 12.36 |
Available documents
Spec sheet (Kohler)Spec sheet — G4129 125REZG (Kohler)Spec sheet — Kohler-REZG-spec-sheet (Kohler)Reference (Kohler)Reference — G6-39 0918AZ (Kohler)Reference — Katalog-promyshlennoj-produktsii (Kohler)Reference — Kohler-125REZG-GM-8.1L-engine-SN-8.1L-22866-load-test-report-and-inspection-chec (Kohler)Parts manual — Reinstated Enclosures (Kohler)Parts manual — tp6667 (Kohler)Service manual — tp6712 (Kohler)Service manual — tp6799 (Kohler)
This page was generated from the 11 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.