HQ1300200QQ21 Expansion Tank Assembly Sany SAT40C Articulated Dump Truck Spare Parts

HQ1300200QQ21 Pressurized Coolant Expansion Tank Assembly for Sany SAT40C

The HQ1300200QQ21 Expansion Tank Assembly (often referred to as the Surge Tank or Coolant Reservoir Assembly) is an essential pressure-regulating and fluid-accumulation system designed for the engine cooling loop of the Sany SAT40C articulated dump truck. Under heavy hauling loads in open-pit mining environments, engine temperatures rise significantly, causing the engine coolant to expand. The expansion tank acts as an accumulator, receiving this expanding fluid in a closed-loop system, separating air bubbles (deaeration) from the coolant, and feeding the fluid back into the primary radiator as the engine cools down and the fluid contracts.

This assembly contains the high-durability polymer Box / Reservoir (160102130021A044), a dedicated Cover (160102130021A043) designed to shield and secure the tank onto the chassis, and the spring-loaded Surge Tank Cap (160102130021A042) which regulates internal cooling loop pressure. We supply the complete HQ1300200QQ21 assembly as well as individual replacement tanks, caps, and covers. Both genuine Sany OEM kits and highly reliable aftermarket options are in stock for rapid international shipping.

General Assembly Specifications

HQ1300200QQ21 Assembly Component Parts List

Below is the detailed parts catalog breakdown of the coolant expansion tank assembly as referenced in the Sany SAT40C technical manual. All listed components can be ordered individually for targeted field service or routine repairs:

Features & Benefits of Our Expansion Tank Assembly

• Precise Pressure Regulation: Equipped with a spring-loaded pressure cap (160102130021A042). This cap regulates system pressure within precise engineering parameters, raising the coolant’s boiling point to prevent localized boiling and cylinder-head cavitation, while safely relieving excess steam during overheating.
• Deaeration and Air-Bubble Separation: The internal design of the reservoir body (160102130021A044) is configured to separate air pockets from circulating coolant. Preventing air entrainment ensures maximum heat transfer across the engine block.
• Durable Composite Construction: The main expansion tank body is manufactured from high-impact, heat-stabilized industrial polymer designed to resist cracking under continuous hot-coolant pressure and cold-weather contractions.
• Structural Protection: The dedicated metal cover (160102130021A043) mounts the tank securely to the vehicle framework, shielding the polymer reservoir from engine bay heat radiation and flying debris.

Ordering & Technical Maintenance Guidelines

1. Check Pressure Cap Rating regularly: The surge tank cap (item 3) is a critical safety valve. Over time, its internal spring can weaken, leading to premature boiling, coolant loss, and engine overheating. Always replace the cap with the correct pressure rating (measured in kPa/PSI) as specified in Sany’s technical manuals.
2. Inspect for Polymer Hairline Cracks: Industrial polymers degrade over extended service cycles due to high operating heat and pressure. Inspect the reservoir body (item 1) for hairline cracks or discoloration. Brittle or leaking reservoirs should be replaced to prevent catastrophic coolant loss on haul routes.
3. Verify Chassis Series Layout: Articulated dump truck auxiliary systems may vary depending on engine emission ratings. Please provide your Sany SAT40C chassis serial prefix so our technical team can verify the exact port diameters and hose mounting positions before shipping.

Contact us with part number HQ1300200QQ21, your desired quantities, and delivery destination to obtain a detailed quote within 1 business day.