The air compressor is a vital component that supplies compressed air to the brake system and pneumatic accessories on the HOWO MAX 4X2 tractor. A reliable compressor ensures adequate air pressure for safe braking and other functions. This genuine HOWO air compressor kit includes the compressor itself, mounting bolts, O‑ring, intermediate gear shaft, intermediate gear assembly, thrust plate, sealant, and blanking caps. When you choose authentic Howo Parts, you receive a complete assembly engineered for the MC13 engine platform.
The air compressor is the main unit that compresses air for the vehicle’s air system. One unit is supplied, rated at 380 cm³ per revolution and operating at a maximum pressure of 12.5 bar. It is driven by the engine timing gear train via an intermediate gear. This two‑cylinder, single‑stage design features an integrated unloader valve for pressure regulation. The compressor is flange‑mounted to the engine block and uses engine oil for lubrication.
The hexagon bolt with flange Q186 – M8X110 – 10.9 – MAN183 – B1 is a long high‑strength fastener used to secure the compressor mounting flange to the engine block. Four bolts are supplied, each with a property class of 10.9, a thread size of M8x1.25, and a length of 110mm. The flange head distributes clamping load and eliminates the need for a separate washer. The MAN183 marking indicates original equipment quality. These bolts must be torqued to 30 Nm for a secure fit of the unit.
The hexagon bolt with flange Q186 – M8X40 – 10.9 – MAN183 – B1 is a shorter high‑strength fastener used to attach the intermediate gear housing to the compressor or engine block. Two bolts are supplied, each with a thread size of M8x1.25 and a length of 40mm. These bolts are also grade 10.9 and are torqued to 30 Nm. They secure the gear cover and ensure proper alignment of the intermediate gear drive for the compressor.
The O-ring 21X1.85 is a rubber sealing ring that seals the interface between the compressor and the engine block or between the unit and its mounting flange. One O‑ring is supplied, made from nitrile rubber (NBR) with a durometer of 70 Shore A. It has an inner diameter of 21mm and a cross‑section of 1.85mm. This O‑ring prevents oil leakage from the engine into the compressor drive cavity. It must be replaced whenever the unit is removed.
The hexagon bolt with flange Q186 – M12X55 – 10.9 – MAN183 – B1 is a larger fastener used to secure the intermediate gear shaft support bracket. Three bolts are supplied, each with a thread size of M12x1.75 and a length of 55mm. These grade 10.9 bolts are torqued to 80 Nm. They provide a rigid mounting point for the gear train that drives the compressor from the engine camshaft.
The intermediate gear shaft of air compressor is a hardened steel shaft that supports the intermediate gear driving the compressor. One shaft is supplied, made from case‑hardened 20CrMnTi steel with a surface hardness of 58‑62 HRC. The shaft has a diameter of 25mm and a length of 80mm. It is pressed into the engine block and acts as the pivot for the intermediate gear. The shaft has an oil feed hole to lubricate the gear bushing.
The intermediate gear assembly of air compressor is a complete gear unit that transmits power from the engine camshaft gear to the compressor drive gear. One assembly is supplied, consisting of a steel gear with a bronze bushing and a retaining ring. The gear has 48 teeth with a module of 2.5, and it is induction hardened to resist wear. This gear reduces the rotational speed from the camshaft to the compressor, providing the correct drive ratio.
The intermediate gear shaft thrust plate of air compressor is a flat steel plate that retains the intermediate gear on its shaft. One plate is supplied, made from hardened steel with two mounting holes. It is secured to the engine block using the M8 bolts and prevents axial movement of the intermediate gear. The thrust plate is ground flat to ensure correct gear alignment and minimal end play.
The sealant N703 – A2 DK300ML LOCTITE5900 is a high‑performance anaerobic gasket maker used to seal the compressor mounting flange and other interfaces. One tube (300ml) is supplied. This sealant cures in the absence of air and resists oil, coolant, and high temperatures up to 200°C. It is applied as a thin bead to the mating surfaces before assembling the unit, preventing oil leaks and ensuring a gas‑tight seal.
The air compressor blanking cap is a plastic cover used to seal the air intake port of the compressor during storage or transport. One cap is supplied, made from low‑density polyethylene. It prevents dirt and debris from entering the unit before installation. Remove the cap and replace it with the intake hose during final assembly.
The air compressor outlet blanking cap is a plastic cover used to seal the compressed air outlet port of the compressor. One cap is supplied, made from the same LDPE material. It protects the outlet from contamination until the discharge line is connected. Always remove this cap before connecting the air line to the unit.
Air compressor – genuine HOWO air compressor and drive kit
| Material Encoding | Name |
|---|---|
| AZ100013000010 | Air compressor |
| MQ6-03216-8318 | Hexagon bolt with flange Q186 – M8X110 – 10.9 – MAN183 – B1 |
| MQ6-03216-8308 | Hexagon bolt with flange Q186 – M8X40 – 10.9 – MAN183 – B1 |
| 030V04902-0117 | O-ring 21X1.85 |
| MQ6-03216-8511 | Hexagon bolt with flange Q186 – M12X55 – 10.9 – MAN183 – B1 |
| 200V54210-0172 | Intermediate gear shaft of air compressor |
| 200-54210-6042 | Intermediate gear assembly of air compressor |
| 200V90720-0208 | Intermediate gear shaft thrust plate of air compressor |
| MQ4-10394-9272 | Sealant N703 – A2 DK300ML LOCTITE5900 |
| 202V54100-1122 | Air compressor blanking cap |
| 202V54100-1121 | Air compressor outlet blanking cap |
This kit includes not only the compressor head but also the intermediate gear, shaft, thrust plate, all mounting bolts, O‑ring, sealant, and blanking caps. Everything needed to install a new unit on the MC13 engine.
All hexagon flange bolts are property class 10.9 and carry the MAN183 quality mark. They provide secure clamping that resists loosening under engine vibration, ensuring the compressor stays mounted.
The intermediate gear and shaft are case‑hardened for long wear. The gear assembly includes a bronze bushing for low friction. This drive train reliably transfers power from the camshaft to the compressor.
The supplied O‑ring and LOCTITE5900 sealant ensure that the compressor mounting flange is oil‑tight. The blanking caps protect ports during shipping, and the outlet cap prevents contamination before hose connection.
The air compressor is gear‑driven from the engine camshaft through the intermediate gear train. As the engine rotates, the intermediate gear turns the compressor crankshaft, which drives two pistons. Intake air passes through a filter (not included) and is compressed in the cylinders. The compressed air is discharged through the outlet port to the air dryer and then to the air reservoirs. An unloader valve on the compressor head stops compression when the system pressure reaches the cut‑out pressure (typically 12.5 bar), reducing engine load. The unit is lubricated by engine oil via a feed line to the crankcase.
Begin by draining the engine oil and removing the old compressor and drive components. Clean the mounting surface on the engine block. Install the intermediate gear shaft into the block using a press if necessary. Place the intermediate gear assembly onto the shaft, then secure the thrust plate with two M8x40 bolts (torque to 30 Nm). Apply a thin bead of LOCTITE5900 sealant to the compressor mounting flange. Install the O‑ring into the groove. Mount the compressor using four M8x110 bolts and three M12x55 bolts, torquing them to 30 Nm and 80 Nm respectively. Remove the blanking caps and connect the intake hose and discharge line. Refill engine oil and run the engine to check for leaks.
This compressor kit is designed for the MC13 engine used in the HOWO MAX 4X2 tractor. It fits all production years from 2018 onward. The unit displacement and drive ratio are matched to the engine’s air consumption. The intermediate gear has the correct tooth count to maintain the proper compressor speed. Always verify your engine serial number before ordering this kit.
Inspect the compressor for oil leaks or unusual noise every 50,000 km. Check the drive gear for wear; if the intermediate gear teeth are pitted, replace the gear assembly. The O‑ring should be replaced whenever the unit is removed. The sealant joint should be inspected; any oil seeping indicates a need to re‑seal. Keep the compressor intake clean and replace the intake air filter regularly. If the unit fails to build pressure, check the unloader valve and cylinder head gasket.
If the compressor runs continuously (unloader valve does not cut out), the governor may be faulty. If there is excessive oil in the air system, the piston rings may be worn. A knocking noise from the drive area could indicate a worn intermediate gear bearing or loose bolts. Low air pressure output may be caused by a leaking O‑ring or a cracked discharge line. Always use genuine HOWO replacement parts for any repairs to the system.
Aftermarket compressors often have lower displacement or inferior metallurgy, leading to poor air output and short life. Generic intermediate gears may be made from soft steel and wear rapidly. The bolts in copy kits may be class 8.8 instead of 10.9, risking loosening or breakage. The O‑ring may not be NBR and can harden or swell. Genuine HOWO components are manufactured to the exact specifications of the original MC13 engine, using hardened gears, high‑grade seals, and certified fasteners. The small additional cost is far outweighed by the reliability and safety of a properly functioning air system.
The compressor is shipped in a reinforced cardboard box with foam padding. The hardware and sealant are in sealed poly bags. The packaging is recyclable. The manufacturing facility is ISO 14001 certified. No hazardous substances are used in the production of these parts. The LOCTITE5900 sealant is non‑toxic when cured.
This kit includes all eleven line items listed in the parameters table. Individual components can be ordered separately using their material encodings. Authorized HOWO dealers in Nigeria stock these genuine parts. For fleet orders of three or more complete kits, volume discounts are available. Always provide your engine serial number to confirm compatibility.
Fleet managers who have installed this genuine HOWO compressor kit report consistent air pressure and fewer failures. The included intermediate gear and shaft eliminated the need to source separate parts. The LOCTITE sealant has prevented oil leaks at the mounting flange. Many operators have standardized on this kit for all MC13 engine compressor replacements, citing the all‑in‑one nature and the reliability of genuine components.
The compressor is shipped in a box measuring 50cm x 40cm x 30cm, weight 18 kg. Store the kit in a dry indoor area. Do not remove the blanking caps until installation to prevent dirt entry. The sealant should be stored at room temperature (15‑25°C) and used within two years. Protect the unit from impact that could damage the mounting flange or pistons.
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