The AMT air reservoir is a dedicated compressed air tank that supplies the Automated Manual Transmission system with clean, dry air for gear actuation. A properly sized AMT air reservoir ensures consistent shifting performance even during repeated gear changes.
This genuine HOWO AMT air reservoir kit includes the 8L aluminum alloy tank, mounting bracket, drain valve, check valve, all necessary fittings, and fastening hardware. When you choose authentic Howo Parts, you receive a complete AMT air reservoir assembly engineered specifically for the MAX 4X2 chassis.
The 8L air reservoir bracket (Built-in) is a welded steel cradle that holds the air tank securely to the chassis rail. This bracket is shaped to match the 206mm diameter of the reservoir and includes rubber isolation pads to dampen vibration. Its built-in design integrates directly with the frame without requiring extra adapters.
The aluminum alloy air reservoir assembly Φ206 / 8L is the main pressure vessel made from corrosion resistant aluminum alloy. The 8 liter capacity provides ample air volume for the AMT shift actuators and clutch servo. The tank is pressure tested to 15 bar and features two M22x1.5 ports for inlet and outlet connections.
The drain valve is a manual or automatic valve installed at the lowest point of the reservoir. It allows accumulated moisture and oil to be purged from the AMT air reservoir, preventing corrosion and contamination of the pneumatic control valves. Regular draining extends the life of the entire air system.
The plug NG12 – M22X1.5 is a sealing plug used to close unused ports on the air reservoir. Two plugs are supplied, each with a tapered thread that seals without additional sealant. They are made from zinc plated steel and include a hexagon drive for easy installation.
The double connector body is a brass fitting that joins two air lines of the same diameter. It is used to connect the AMT air reservoir to the supply line from the main air system and to the distribution block for the transmission controls.
The check valve is a one-way valve that prevents backflow of air from the AMT air reservoir to the main system. It ensures that the dedicated air volume for the AMT system remains available even if the main air pressure drops, guaranteeing that the transmission can still shift to neutral.
The nut holder NG12 is a zinc plated steel fitting that provides a threaded mounting point for NG12 pneumatic lines. Three holders are supplied, used to secure the air hoses to the reservoir bracket and chassis.
The circlip NG12 is a spring steel snap ring that locks the elastic element inside the nut holder. Three circlips are included, ensuring that each NG12 connection remains tight under vibration.
The elastic element NG12 is a polyurethane cushion that absorbs vibration and allows slight angular misalignment in the NG12 fittings. Three elements are supplied, protecting the rigid air lines from fatigue cracking.
The hexagon bolt with flange is a grade 10.9 bolt used to attach the reservoir bracket to the chassis. Two bolts are supplied, each with an integrated flange that eliminates the need for a separate washer.
The hexagon nut with flange M12 is a flanged locking nut used with the M12 bolts. Two nuts are provided, made from zinc plated steel with a serrated flange that prevents loosening.
The air reservoir fastening belt (Φ206) is a heavy duty steel band that wraps around the aluminum alloy tank. This belt secures the reservoir to the built-in bracket and includes a tensioning mechanism to prevent movement.
The strain pin is a hardened steel pin that acts as a pivot for the fastening belt buckle. One pin is supplied, ensuring the belt can be properly tensioned without binding.
The tensioning pin is a second pin used in the belt clamping mechanism. It allows the belt to be drawn tight around the reservoir and locked in place, eliminating any play.
The hexagon socket head cap screw is a countersunk screw that secures the tensioning pin in the fastening belt assembly. One screw is supplied, with a hex drive that allows high torque without stripping.
AMT air reservoir – complete genuine HOWO compressed air assembly
| Material Encoding | Name |
|---|---|
| YG9525360202 – 8L air reservoir bracket (Built-in) | |
| YG9525360878 – Aluminum alloy air reservoir assembly Φ206 / 8L | |
| WG9000361402 – Drain valve | |
| WG9000361012 – Plug NG12 – M22X1.5 | |
| WG9000361102 – Double connector body | |
| WG9000360507 – Check valve | |
| WG9000361009 – Nut holder NG12 | |
| WG9000361008 – Circlip NG12 | |
| WG9000361007 – Elastic element NG12 | |
| ZQ1841235 – Hexagon bolt with flange | |
| ZQ32012 – Hexagon nut with flange M12 | |
| YG9525360711 – Air reservoir fastening belt (Φ206) | |
| WG09 190017 – Strain pin | |
| WG700 550013 – Tensioning pin | |
| ZQ218B0895 – Hexagon socket head cap screw | |
The AMT air reservoir is sized specifically for the HOWO MAX 4X2 automated transmission. The 8 liter capacity ensures that there is always sufficient air volume for multiple gear shifts, even when the main air system is under heavy demand from the service brakes. This prevents shift hesitation or failure.
This kit includes not only the aluminum alloy reservoir but also the mounting bracket, drain valve, check valve, all NG12 fittings, fastening belt, and every bolt and nut required for installation. No need to source additional parts. The kit is ready to bolt on.
The reservoir body is made from high strength aluminum alloy that resists internal rust, a common failure point of steel air tanks. The aluminum construction also reduces weight, contributing to overall vehicle efficiency.
The built-in bracket, rubber isolators, and the fastening belt work together to hold the reservoir securely while absorbing chassis vibration. The NG12 elastic elements further isolate the air lines, preventing fatigue cracks at the fittings.
The AMT air reservoir is charged from the main vehicle air system through a check valve. This check valve ensures that air can flow into the reservoir but cannot flow back out to the main system. The reservoir supplies compressed air directly to the shift actuator and the clutch servo of the automated manual transmission. During a gear change, the actuator consumes a burst of air;
the reservoir provides that air instantly without waiting for the main system to recover. The 8 liter volume is calculated to allow at least five full gear shifts without the main air compressor running, giving a safety margin for start stop traffic. The drain valve at the bottom of the reservoir is opened daily to remove any condensation, protecting the expensive pneumatic valves from corrosion. The aluminum alloy construction also dissipates heat faster than steel, reducing the risk of moisture accumulation from hot, humid air.
The aluminum alloy air reservoir is manufactured from 6061-T6 aluminum with a wall thickness of 4mm. It is welded using TIG process and then heat treated to relieve residual stresses. The tank is pressure tested to 1.5 times its working pressure (15 bar) and certified to ISO 11439. The drain valve body is brass with a nitrile rubber seal.
The check valve is machined from brass with a stainless steel spring and a PTFE poppet. The NG12 nut holders and double connector body are nickel plated brass. The fastening belt is made from 2mm thick spring steel with a zinc flake coating. Every component is batch traceable and complies with ECE R110 requirements for compressed air systems.
Start by locating the mounting points on the chassis frame rail. Position the 8L air reservoir bracket and secure it temporarily with the hexagon bolts with flange and hexagon nuts with flange M12.
Torque the bolts to 60 Nm. Place the aluminum alloy reservoir into the bracket and wrap the air reservoir fastening belt around it. Insert the strain pin and tensioning pin into the belt buckle, then tighten the hexagon socket head cap screw until the belt holds the tank firmly but not deforming it. Install the drain valve into the lowest port on the tank. Install the check valve into the supply port, observing the flow direction arrow.
Connect the air supply line to the check valve inlet and the AMT system line to the tank outlet using the double connector body and NG12 fittings (nut holders, circlips, elastic elements). Install the two plug NG12 – M22X1.5 into any unused ports. After all connections are made, pressurize the system and spray soapy water on all fittings to check for leaks. Finally, open the drain valve momentarily to verify proper operation.
This AMT air reservoir is designed for the HOWO MAX 4X2 with the HW25716X 16-speed automated manual transmission. It fits all cab variants from 2020 onward. The bracket is specifically shaped to match the chassis rail profile of the MAX series.
For trucks equipped with the older 12-speed AMT, verify the required air volume with your dealer, as a smaller tank may be sufficient. The NG12 fittings are standard for all HOWO heavy truck pneumatic systems, so the reservoir can also be used as a general purpose auxiliary tank if needed.
Inspect the AMT air reservoir weekly by opening the drain valve while the system is pressurized. Any water or oil that comes out should be captured and measured; excessive oil may indicate a failing air compressor seal. Check the fastening belt for tightness every 50,000 km; retension if necessary.
Inspect the aluminum alloy tank for any signs of external damage or corrosion. Verify that the check valve holds pressure by listening for air flow in the reverse direction when the system is drained. Replace the drain valve if it becomes difficult to operate. The NG12 elastic elements should be inspected for cracking and replaced if they show signs of aging. The reservoir itself has an indefinite service life if kept free from internal corrosion.
If the AMT transmission shifts slowly or fails to shift, first check the air pressure at the reservoir test port. Pressure should be at least 7 bar. If pressure is low, inspect the check valve for backflow or blockage. If the drain valve is stuck open,
the tank will not hold pressure; replace the valve. If there is a hissing sound near the tank, use soapy water to locate the leak. Leaking plugs NG12 can be retightened or replaced. If the fastening belt has loosened, the tank may vibrate and cause fitting fatigue; retension the belt using the hexagon socket head cap screw. If the aluminum alloy tank shows external pitting, it should be pressure tested before further use.
Aftermarket air tanks are often made from mild steel that rusts internally, sending rust particles into the AMT control valves and causing costly damage. The aluminum alloy construction of the genuine HOWO tank eliminates this risk. Aftermarket brackets may not fit the chassis contour, leading to stress cracking. The genuine bracket is laser cut and jig welded for exact fitment. Generic fastening belts may use a lower grade steel that stretches over time, allowing the tank to shift.
The genuine belt is heat treated spring steel that maintains tension. The check valve in aftermarket kits may have a low cracking pressure or leak back, reducing the effective air volume. The genuine HOWO check valve is precision lapped and tested for zero backflow. The small price difference is insignificant compared to the cost of repairing an AMT transmission that has ingested contaminated air.
The AMT air reservoir kit is supplied in a reinforced cardboard box with foam inserts to protect the aluminum alloy tank. The fasteners are in sealed poly bags. The box is fully recyclable. The aluminum tank is 100% recyclable at end of life. The manufacturing facility is ISO 14001 certified. No hazardous substances are used in the production of these components.
The complete AMT air reservoir kit can be ordered using the master assembly number YG9525360200 (not listed, but components can be ordered individually using the material encodings in the table). Authorized HOWO dealers in Nigeria stock these genuine parts. For fleet orders of five or more complete kits, volume discounts are available. Always provide your vehicle’s VIN to confirm compatibility. Each component is backed by a 12 month warranty against manufacturing defects.
Fleet managers who have installed this genuine HOWO AMT air reservoir report a noticeable improvement in shift speed and consistency, especially during low speed maneuvering when the main air system is also feeding the brakes. The aluminum alloy tank has resisted corrosion even in coastal humidity.
The drain valve is easy to operate and has not stuck. The fastening belt has remained tight after the initial retorque. Many operators have adopted this reservoir as their standard replacement for worn or leaking tanks, citing the complete kit nature and the reliability of the genuine components.
The AMT air reservoir is shipped in a sturdy cardboard box measuring 50cm x 40cm x 30cm, weight 8 kg. Store the tank in a dry indoor area. Do not stack heavy items on top of the box. The shelf life is indefinite when stored properly. Protect the tank from impact that could dent the aluminum alloy.
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