Hydro-Gear 71938 Expansion Tank & Cap ASM 1000mL OEM replacement reservoir — genuine fit, pressure-sealed

The Hydro-Gear 71938 Expansion Tank & Cap ASM is a genuine OEM 1000ML replacement reservoir and cap assembly designed to restore proper hydraulic coolant expansion and pressurization on compatible lawn and turf equipment.

If your Hydro-Gear powered mower or turf machine has a cracked, leaking, or missing expansion tank, this factory-original 71938 assembly returns the system to the manufacturer’s intended fit and function. Made to OEM specifications, the tank and cap are molded for correct hose connections and pressure handling so you avoid the fitment guesswork that can come with aftermarket parts.

How does the Hydro-Gear expansion tank fit my machine?

This Hydro-Gear 71938 tank is produced to the original equipment dimensions and connection types, ensuring straightforward replacement on models that list part #71938. Installation is typically plug-and-play when the original mounting points and hoses are intact.

• OEM part number 71938 for exact fitment.
• Pre-formed inlet/outlet ports match factory hose diameters.
• Includes cap assembly sized for original pressurization needs.
• Mounting locations mirror the factory tank to minimize modifications.

What materials and capacity does the tank use?

The assembly is a 1000 milliliter reservoir molded from durable thermoplastic designed for hydraulic coolant exposure and everyday outdoor use. The cap seals to maintain proper system pressure and keep debris out.

• 1,000 mL nominal internal capacity for expansion control.
• Resilient plastic construction resistant to oil and coolant contact.
• Factory cap designed to maintain recommended system pressure range.
• UV-resistant finish suited for outdoor equipment exposure.

Is installing the assembly difficult and what tools are needed?

For most mechanically-inclined owners the swap is a basic service task: drain any residual fluid, disconnect hoses, unbolt the old tank, and install the new part. No special tools are required beyond common hand tools.

• Typical tools: screwdrivers, pliers, and a wrench set.
• Drain and catch pan recommended to avoid spills.
• Check hose clamps and replace if corroded for a secure seal.
• Inspect surrounding components while replacing the tank.

How will a genuine Hydro-Gear part benefit long-term performance?

Using an OEM 71938 assembly preserves the original hydraulic system design and reduces the risk of misfit or premature wear that can come from generic substitutes. Genuine parts help maintain intended fluid dynamics and sealing characteristics.

• Factory tolerances reduce leak potential and pressure loss.
• Material compatibility lowers risk of chemical degradation.
• Consistent fitment minimizes installation stress on hoses and brackets.
• Maintains resale and service history value with OEM components.

Who is this for: The Hydro-Gear 71938 1000ML Expansion Tank & Cap ASM is aimed at turf professionals, landscapers, and DIY owners who need a direct-fit OEM replacement for Hydro-Gear-equipped mowers and equipment. Choose this assembly if you require a factory-specified tank for reliable sealing, correct hose connections, and material compatibility with hydraulic coolant systems used in outdoor power equipment.