The Multiquip 13104ZJ1840 is a genuine OEM Piston (OS 0.75) designed for GA9.7HE, AR13H, AR13HA/HAR, and AR13HC series equipment. As a factory-sourced component, it meets the exact dimensional and material specifications required for a correct engine rebuild on these machines. This oversize piston is engineered to restore proper compression and engine performance after cylinder wear, and it ships as a direct replacement with no guesswork on fit or spec. Whether you are servicing a generator or an asphalt roller in this model family, 13104ZJ1840 is the part Multiquip specifies for this application.
Key Features
- Genuine OEM Oversize Spec: — Cast and machined to the exact 0.75mm oversize tolerance Multiquip specifies for engine rebuilds — not a general-purpose piston adapted to fit.
- Correct Dimensional Match: — Sized to drop into a properly bored cylinder without shimming or modification, ensuring correct ring seal and piston-to-wall clearance from the first start.
- Confirmed Fitment: — Verified for GA9.7HE generators and AR13H, AR13HA/HAR, and AR13HC asphalt rollers.
- Compression Restoration: — A worn or scored piston causes loss of compression, rough running, excessive oil consumption, and hard starting — installing the correct oversize piston returns the engine to full power output.
- Fuel System Integrity: — Proper piston fit is critical to maintaining the combustion seal that keeps unburned fuel out of the crankcase oil, protecting the entire lower end of the engine.
A piston is the reciprocating component inside the engine cylinder that converts combustion pressure into crankshaft rotation. As the piston moves up and down, its rings seal combustion gases above and control oil below — making dimensional accuracy essential. When a piston wears or scores, compression drops, oil usage climbs, and engine output falls off sharply. An oversize piston like the 13104ZJ1840 is used during an engine rebuild after the cylinder bore has been machined to a larger diameter, restoring the correct clearance and seal that the engine depends on for full performance.
Part Details
| Part Number | 13104ZJ1840 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Piston (OS 0.75) |
Compatibility & Fitment
| Name | Model |
|---|---|
| Gasoline Powered Generators | GA9.7HE |
| Rollers | AR13H |
| Rollers | AR13HA/HAR |
| Rollers | AR13HC |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
