Forklift Starter Motor Selection
Identify the engine build, electrical rating and starter drive interface before comparing replacements. A matching engine family or similar housing is not enough.
807042-9972 starter-motor reference with mounting nose and solenoid visible; confirm the complete engine and starter specification.
Documented starter designs
These manufacturer examples explain design differences. They are not interchangeable families, an Authpart stock list or confirmed applications for your forklift.
| Manufacturer example | Documented design or range | Still to confirm for a replacement |
|---|---|---|
| DENSO PA | Planetary reduction between the motor and starter drive | Exact part number, voltage, power, pinion and mounting |
| DENSO RA | High-speed motor with reduction gearing | Exact part number and engine application; the RA name does not specify mounting |
| DENSO PA90 heavy duty | Documented 12 V and 24 V versions | Voltage variant, pinion, rotation, flange and application |
| Bosch commercial-vehicle starters | On- and off-highway portfolio includes 12 V and 24 V systems | Exact Bosch reference and application; portfolio voltage is not a rating for every unit |
Match the drive and mounting as well as the voltage
| Field | What to provide | What it establishes |
|---|---|---|
| Engine and reference | Engine nameplate, full build/suffix, serial and old starter number | A traceable application starting point; truck model alone may not identify the engine build |
| Voltage and power | Rated V and kW from the starter label or engine parts documentation | Required electrical version; do not infer starter voltage from traction-battery voltage |
| Pinion | Tooth count, pinion diameter where available and clear nose-end view | Drive geometry to compare with the documented replacement |
| Rotation | Manufacturer direction and stated viewing end | A consistent direction reference; clockwise without a viewing end is incomplete |
| Flange and fixing holes | Flange/nose diameter, hole spacing, hole diameters and threads | Mechanical attachment; include dimensions with units |
| Solenoid and terminals | Solenoid position, main terminal and control connection photographs | Clearance, cable reach and control-terminal configuration |
Read the full number on the starter you are replacing
The pictured reference is 807042-9972. Its accompanying label identifies STARTER 4JG2. This is useful identity evidence, but the photograph does not establish a voltage, power rating, tooth count or complete engine-build compatibility.
807042-9972 starter reference. Keep the mounting nose and solenoid visible when sending comparison photographs. Packaging quantity is not an MOQ or stock statement. View full photo
How to use a proposed cross-reference
A supplier number, engine number and starter-manufacturer number can all appear in the same inquiry. Record them separately. A replacement needs documented application or interchange evidence, not just a similar number or casing. No manufacturer cross-reference for 807042-9972 is confirmed on this page.
- Send both the existing and proposed numbers, preserving every suffix.
- If tooth count or nose geometry differs, obtain the manufacturer’s documented replacement explanation; do not resolve the difference by appearance alone.
- Have a qualified technician check the battery, cables and starting circuit when the fault has not been isolated. A no-crank symptom alone does not identify a failed starter.
Ask about the part you need
A part number is optional. Start with the information you have.
Related parts and selection information
Technical references
Manufacturer references describe particular products or families. They do not establish Authpart stock or compatibility with your truck.