The Multiquip 21391 Spacer.75 Od X.318 Id X.78 L is a genuine OEM component designed for Whiteman ride-on power trowels including the STX55 and HTX44 series. As a direct factory replacement, this spacer maintains the correct dimensional tolerances needed for precise component alignment within the trowel assembly. Confirmed fitment covers STX55Y6, STX55J6, STXD6i, HTX44Y5, HTX44Y4, HTX44K5, HTX44K4, HTXG6DF, HTXD6i, HHXD5, and HHXD5-ES models. Sourcing a genuine OEM part like the 21391 ensures you are restoring the machine to its original build specification.
Key Features
- Genuine OEM Dimensional Accuracy — Manufactured to exact outer diameter, inner diameter, and length specifications (.75 OD x .318 ID x .78 L), ensuring correct stack-up and alignment within the trowel drivetrain.
- Drop-In Installation — Matches the original spacer profile exactly, seating correctly without any modification to surrounding hardware or mounting points.
- Broad STX55 and HTX44 Coverage — Compatible with STX55Y6, STX55J6, STXD6i, HTX44Y5, HTX44Y4, HTX44K5, HTX44K4, HTXG6DF, HTXD6i, HHXD5, and HHXD5-ES ride-on trowels.
- Correct Component Spacing — Maintains proper clearance and load distribution between mating components, preventing premature wear on adjacent parts caused by misalignment or incorrect spacing.
- Verified Multiquip Part Number — Sold as part number 21391 direct from the Multiquip OEM parts catalog, eliminating guesswork when cross-referencing your trowel's parts manual.
A spacer is a precision-machined component used to maintain a fixed gap or positional relationship between two adjacent parts within an assembly. In a ride-on power trowel, spacers like the Multiquip 21391 ensure that rotating or load-bearing components are correctly positioned along a shaft or within a housing, preventing metal-to-metal contact and distributing mechanical loads evenly. When a spacer is worn, deformed, or missing, surrounding components can shift out of alignment, accelerating wear on bearings, shafts, and housings and leading to more significant mechanical failures over time.
Part Details
| Part Number | 21391 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Spacer .75 Od X .318 Id X .78 L |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | STX55Y6 |
| Whiteman Ride-On Power Trowels | HTXG6DF |
| Whiteman Ride-On Power Trowels | HHXD5-ES |
| Whiteman Ride-On Power Trowels | HTXD6i |
| Whiteman Ride-On Power Trowels | STXD6i |
| Whiteman Ride-On Power Trowels | HHXD5 |
| Whiteman Ride-On Power Trowels | HTX44Y5 |
| Whiteman Ride-On Power Trowels | HTX44Y4 |
| Whiteman Ride-On Power Trowels | STX55J6 |
| Whiteman Ride-On Power Trowels | HTX44K5 |
| Whiteman Ride-On Power Trowels | HTX44K4 |
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.
