The Multiquip 42551 Hydraulic Oil Expansion Tank Cap is a genuine OEM replacement designed for HTX6H, STX6H, and HTXG6DF hydrostatic ride-on power trowels. As a direct OEM component, it is built to the exact specifications required to seal and protect the hydraulic oil expansion tank on these machines. Sourced directly through Multiquip's authorized parts program, the 42551 ensures a correct, verified fit for these trowel models without guesswork.
Key Features
- Genuine OEM Sealing Integrity — Manufactured to Multiquip's exact pressure and material tolerances, ensuring the expansion tank cap seats and seals correctly under hydraulic system operating conditions.
- Direct-Fit Replacement — Designed as a drop-in replacement for the hydraulic oil expansion tank on HTX6H, STX6H, and HTXG6DF trowels, matching the original thread and cap profile.
- Confirmed Fitment — Verified for the HTX6H, STX6H, and HTXG6DF Whiteman hydrostatic ride-on power trowel series.
- Hydraulic System Protection — A properly sealing expansion tank cap maintains correct system pressure and prevents contamination from entering the hydraulic oil reservoir, keeping trowel blade response consistent and precise.
- Fuel and Fluid Safety Compliance — A damaged or missing expansion tank cap can allow hydraulic fluid contamination or pressure loss, leading to erratic blade pitch control or potential hydraulic system damage.
The hydraulic oil expansion tank cap seals the reservoir that accommodates fluid volume changes as the hydraulic system on the trowel heats up and cools down during operation. It keeps contaminants — dirt, water, and debris — out of the hydraulic fluid, which is critical for consistent blade pitch control and smooth drive response on hydrostatic trowels. When this cap is cracked, missing, or no longer sealing properly, it can allow contamination into the system, accelerating wear on hydraulic components and degrading the trowel's performance over time.
For questions about fitment or to confirm this part is correct for your machine, contact the DHS Equipment parts team before ordering.
Part Details
| Part Number | 42551 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Hydraulic Oil Expansion Tank Cap |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | HTX6H |
| Whiteman Ride-On Power Trowels | STX6H |
| Whiteman Ride-On Power Trowels | HTXG6DF |
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.
