The Multiquip 21212 Spider Kit 6 Blade Splined Shaft is a genuine OEM component designed for STX55J6, HTX44Y4, and HTX44Y5 hydrostatic ride-on power trowels. As a direct Multiquip OEM part, 21212 is built to the exact tolerances required for proper blade pitch engagement and consistent trowel performance on every pass. This kit is the correct replacement for worn or damaged spider assemblies on the listed STX and HTX series machines, ensuring the blade pitch control system operates as originally engineered.
Key Features
- Genuine OEM Blade Interface Precision — Manufactured to Multiquip's exact spline profile, ensuring full engagement with the trowel blade arms and consistent pitch response across all six blades.
- Direct-Fit Replacement — Engineered as a drop-in assembly for the STX55J6, HTX44Y4, and HTX44Y5 trowel decks, matching the original mounting configuration without modification.
- STX and HTX Series Compatibility — Confirmed fitment for STX55J6, HTX44Y4, and HTX44Y5 hydrostatic ride-on trowels, covering both super-sized and heavy-duty series platforms.
- Maintains Blade Pitch Control — A worn or damaged spider allows blade arms to slip or bind under load, producing an uneven finish. A correctly functioning spider delivers smooth, uniform pitch adjustment across the full trowel deck.
- Operational Safety Under Load — The spider assembly bears significant rotational and lateral force during finishing operations; a compromised unit can cause abrupt blade angle changes that create finishing defects or loss of operator control.
The spider kit is the central hub assembly that connects the trowel's pitch-control mechanism to each of the six blade arms. As the operator adjusts blade pitch — whether increasing aggression during floating or fine-tuning angle during finishing — the spider translates that input simultaneously and evenly to all blade arms through its splined shaft interface. When the spider wears, develops play in the splines, or cracks under repeated stress cycles, blade pitch becomes inconsistent across the deck, resulting in chatter, uneven surface texture, and accelerated wear on surrounding blade arm components. Replacing it promptly with the correct OEM part restores full, balanced pitch control and protects the integrity of the finish.
Part Details
| Part Number | 21212 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Spider Kit 6 Blade Splined Shaft |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | STX55J6 |
| Whiteman Ride-On Power Trowels | HTX44Y4 |
| Whiteman Ride-On Power Trowels | HTX44Y5 |
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.
