The Multiquip 21129 Cooler Hydraulic Htha Mf15 12 In Dia Htx is a genuine OEM hydraulic cooler designed for the HTX44K4, HTX44K5, HTX44Y4, and HTX44Y5 hydrostatic ride-on power trowels. As a direct Multiquip OEM component, part 21129 is manufactured to the same specifications as the original unit installed at the factory, ensuring a correct fit within the HTX44 series hydraulic system. Sourced directly through authorized Multiquip distribution, this cooler is the recommended replacement when servicing or restoring the hydraulic cooling circuit on your HTX44 trowel. DHS Equipment stocks genuine Multiquip OEM parts to keep your equipment performing at spec.
Key Features
- Genuine OEM Construction — Built to Multiquip's original specifications for the HTX44 hydraulic circuit, with correct core sizing and port configuration for the Htha Mf15 cooler position.
- Direct Bolt-In Replacement — Matches the original 12-inch diameter form factor of the HTX44 series cooler, allowing installation without rework to existing hydraulic lines or mounting brackets.
- HTX44 Series Compatibility — Confirmed fitment for HTX44K4, HTX44K5, HTX44Y4, and HTX44Y5 hydrostatic ride-on trowels across Kubota and Yanmar engine variants.
- Sustained Hydraulic Fluid Temperature Control — A properly functioning hydraulic cooler keeps fluid temperatures within the operating range required for consistent blade pitch response and smooth hydrostatic drive performance across extended finishing runs.
- Hydraulic System Protection — Overheated hydraulic fluid accelerates seal degradation and pump wear throughout the HTX44 drive and blade control circuits; replacing a failing cooler promptly protects downstream components.
The hydraulic cooler in an HTX44 series ride-on trowel dissipates heat generated by the hydrostatic drive system, which uses hydraulic pressure to control both blade pitch and machine propulsion. As hydraulic fluid circulates through the system under load, it absorbs heat; the cooler transfers that heat into the surrounding airflow to keep fluid viscosity and system pressure within the designed operating range. When the cooler becomes damaged, corroded, or restricted, fluid temperatures rise, leading to sluggish blade response, erratic drive behavior, and accelerated wear on pumps, motors, and seals throughout the hydraulic circuit.
Part Details
| Part Number | 21129 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Cooler Hydraulic Htha Mf15 12 In Dia Htx |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | HTX44K5 |
| Whiteman Ride-On Power Trowels | HTX44Y4 |
| Whiteman Ride-On Power Trowels | HTX44Y5 |
| 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.
