The Multiquip 21400 Crank is a genuine OEM component designed for Whiteman hydrostatic ride-on power trowels and Multiquip diaphragm pumps, including the HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, STX55Y6, STXD6i, HTXD6i, MQD2H, MQD3H, MQD2HA, and MQD3HA. Sourced directly from Multiquip, this is the exact part specified for these machines — no guesswork on fitment. Keeping the crank in good condition is critical to maintaining consistent blade pitch response on trowel applications and proper stroke action on diaphragm pump models. DHS Equipment stocks genuine Multiquip OEM parts so you can get the right component and get back to work fast.
Key Features
- Genuine OEM Construction — Manufactured to Multiquip's exact design tolerances, ensuring correct geometry and material grade for consistent mechanical motion across all listed models.
- Direct-Swap Replacement — Engineered to install in the same position as the original, using existing mounting points with no modification to surrounding components.
- Broad Verified Fitment — Compatible with HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, STX55Y6, STXD6i, HTXD6i, MQD2H, MQD3H, MQD2HA, and MQD3HA equipment.
- Maintains Mechanical Stroke Integrity — A worn or damaged crank leads to erratic blade pitch on trowels or inconsistent fluid displacement on diaphragm pumps; a fresh OEM crank restores predictable, repeatable motion.
- Backed by Multiquip OEM Sourcing — Sold by DHS Equipment as an authorized Multiquip parts distributor, so you receive an authentic part with correct part number 21400 confirmation.
A crank converts rotational input from the drive mechanism into reciprocating or oscillating output motion — essential for controlling blade pitch adjustment on hydrostatic ride-on trowels and for driving the diaphragm stroke on pump models. On ride-on trowels such as the HTX44 and STX55 series, the crank directly influences how smoothly and accurately the operator can adjust blade angle during finishing passes. On diaphragm pumps like the MQD2H and MQD3H, crank wear causes inconsistent fluid flow and potential loss of prime. Replacing a worn crank promptly prevents downstream wear on connected components and keeps the machine performing as intended.
Part Details
| Part Number | 21400 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Crank |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | HTX44K4 |
| Whiteman Ride-On Power Trowels | HTX44K5 |
| Whiteman Ride-On Power Trowels | STX55J6 |
| Whiteman Ride-On Power Trowels | HTX44Y4 |
| Whiteman Ride-On Power Trowels | HTX44Y5 |
| Whiteman Ride-On Power Trowels | STXD6i |
| Whiteman Ride-On Power Trowels | HTXD6i |
| Whiteman Ride-On Power Trowels | STX55Y6 |
| Diaphragm Pumps | MQD2H |
| Diaphragm Pumps | MQD3H |
| Diaphragm Pumps | MQD2HA |
| Diaphragm Pumps | MQD3HA |
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.
