Official FAST parameters for the FHB400A: maximum braking torque 4,000 N·m; maximum driveshaft input speed 2,500 rpm; weight 53 kg; oil fill capacity 6.5 L. The 360chemi.com product listing gives the FHB400 parameters as: maximum input speed 2,500 rpm, maximum braking torque 4,000 N·m, oil/water fill capacity 6.5 L, net weight 53 kg, and parallel assembly type

Maintenance and Replacement Specifications

Official FAST Position (maintenance standards announced in the 2025 FAST Sales Online Live Broadcast)

• Working Fluid: API CJ-4 or higher semi-synthetic / fully synthetic diesel engine oil; for ambient temperatures > -10 ℃, 5W-30 is recommended; for ≤ -10 ℃, 0W-30 or 0W-40 is recommended.
• Oil Change Interval: 120,000 km for highway use; 60,000 km for off-road (non-highway) use.
• 24-Hour Service Hotline: 400-889-9901 (FAST "Super-Moved" Service)

General Industry Practice (third parties such as Weikes, Darong Machinery, etc.)

• Replace the O-ring and sealing washers each time the oil is changed; the filter element should be replaced together with every oil change (minimum requirement: must be replaced by the second oil change).
• Replacement procedure: Unscrew the two hex socket bolts on top of the retarder → remove the old filter assembly → install the new filter → tighten to the specified torque.
• For mountainous / mining operations, it is recommended to shorten the interval to 45,000~60,000 km.
• If the drained oil is dark brown with a pungent odor, milky white and turbid, or contains metal particles, it indicates an internal abnormality — immediate repair is required.