The Multiquip 90741889810 Key 7X7X33 GX390 is a genuine OEM crankshaft woodruff key designed for MRH800GS walk-behind rollers and MVH408GH, MVH308GH, and MVH208GH heavy-duty reversible plate compactors. As a direct Multiquip OEM component, 90741889810 is manufactured to the exact dimensions required by the GX390 Honda engine used across these machines. Sourcing the correct key ensures the crankshaft and driven component stay in precise rotational alignment, which is critical to safe and consistent machine operation. DHS Equipment stocks this part to keep your equipment running without unnecessary delays.
Key Features
- Genuine OEM Dimensional Accuracy — Machined to the exact 7x7x33mm specification for the GX390 Honda engine, ensuring the key seats fully and locks correctly in the keyway without slop or play.
- Drop-In Engine Compatibility — Engineered to fit directly into the GX390 crankshaft keyway with no filing, shimming, or machining required on installation.
- Broad Multiquip Fitment — Confirmed fitment across MRH800GS walk-behind rollers and MVH408GH, MVH308GH, and MVH208GH heavy-duty reversible plate compactors.
- Prevents Power Transfer Failure — A worn or sheared key allows the crankshaft and flywheel or drive component to slip out of phase, causing misfires, hard starts, or complete loss of drive — replacing it promptly restores full power transfer.
- Ignition Timing Integrity — On Honda GX390-powered equipment, the crankshaft key also indexes flywheel position; using the correct OEM key preserves correct ignition timing and protects engine internals.
A crankshaft key — also called a woodruff key or keyway key — is a small but load-bearing component that locks the flywheel, pulley, or drive hub to the crankshaft so both rotate together as a single unit. On GX390-powered equipment, the key also sets the angular position of the flywheel magneto relative to the crankshaft, which directly controls ignition timing. If the key shears or wears, the flywheel can slip on the crankshaft, throwing off ignition timing and causing rough running, hard starting, or a no-start condition — making prompt replacement essential to restoring normal engine operation.
For fitment questions or to confirm this part is correct for your machine, contact the DHS Equipment parts team before ordering.
Part Details
| Part Number | 90741889810 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Key 7X7X33 GX390 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Rollers | MRH800GS |
| Plate Compactors | MVH408GH |
| Plate Compactors | MVH308GH |
| Plate Compactors | MVH208GH |
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.
