The part designation refers to components designed for transmissions and engines that are not equipped with a power take off unit. For the HOWO MAX 4X2 tractor, The part configuration uses specific high strength fasteners to secure the blanking covers, support brackets, or auxiliary housings where a PTO would normally mount. This w/o PTO kit contains the essential bolts needed for such applications. When you choose authentic Howo Parts, this w/o PTO fastener set guarantees the correct grade, length, and thread pitch required for reliable, vibration proof assembly. Below are detailed descriptions of every component included with this w/o PTO kit.
The hexagon bolt with flange Q186 – M10X40 – 10.9 – MAN183 – B1 is a high strength M10 fastener with a length of 40mm, property class 10.9, and an integrated flange head. This w/o PTO bolt is manufactured from chromium molybdenum alloy steel, quenched and tempered to achieve a minimum tensile strength of 1040 MPa. The flange distributes clamping load over a larger area than a standard washer, preventing galling or embedding into softer materials such as aluminum housings.
The bolt features a thread pitch of 1.5mm (coarse thread) and is coated with a zinc nickel finish to resist corrosion from road salts, moisture, and engine oil. The 40mm length is specifically chosen for w/o PTO applications where the bolt must pass through a blanking plate or adapter and engage fully into the transmission or engine block.
Under the MAN183 quality standard, this bolt also includes a thread locking patch that activates during installation to prevent loosening under vibration. In The part context, these bolts are used in sets of four to secure a PTO elimination cover or to mount a non driven end housing. Torque specification for this w/o PTO bolt is 50 Nm, applied using a calibrated torque wrench.
Never reuse a w/o PTO bolt that has been previously torqued, as the locking patch will have been crushed and the bolt may have yielded slightly. A genuine w/o PTO fastener ensures that the blanking cover remains oil tight and does not loosen even under the extreme vibrations of a heavy duty diesel engine. Using this w/o PTO bolt in any other location that requires a different grade or length is not recommended; always verify the original part number before ordering.
w/o PTO – genuine HOWO high strength fastener kit for non PTO applications on MAX 4X2
The part bolts in this kit are property class 10.9, offering a tensile strength of 1040 MPa and a yield strength of 940 MPa. This exceeds typical 8.8 grade bolts and provides the safety margin needed for critical transmission and engine cover fasteners in non PTO configurations.
Each w/o PTO fastener features a wide flange that replaces a separate washer and a pre applied thread locking patch (MAN183 specification) that activates during installation, preventing loosening under extreme vibration. This ensures the PTO elimination cover stays sealed for the life of the vehicle.
The part bolts are coated with a zinc nickel alloy that provides up to 500 hours of salt spray resistance. This protects the fastener from road salt, moisture, and engine oil, ensuring that The part cover remains easy to remove even after years of service without rust seizing the threads.
The 40mm length of this w/o PTO bolt is specifically chosen for the thickness of the PTO blanking cover and the depth of the threaded boss in the transmission housing. Using a shorter bolt would not provide enough engagement; a longer bolt could bottom out and crack the housing. This w/o PTO fastener is the correct original specification.
Many HOWO MAX 4X2 tractors are ordered without a power take off (PTO) unit, as they are not required for highway hauling where auxiliary hydraulic pumps or winches are unnecessary. In these w/o PTO vehicles, the transmission case still has the same casting as PTO equipped variants, but the opening where the PTO would bolt on is covered by a blanking plate or a pressed steel cover. This w/o PTO cover is secured by four M10x40 flange bolts exactly like the one described in this kit.
The part configuration reduces overall vehicle weight, cost, and eliminates potential oil leaks from a PTO unit that would never be used. However, it is essential that The part cover is fastened with bolts of the correct grade and length. A under strength bolt could break under vibration, allowing the cover to fall off and causing a catastrophic loss of transmission oil. The part bolting pattern uses four bolts; this kit supplies one piece, but technicians should order four bolts to complete the cover installation.
When installing a w/o PTO cover on a HOWO MAX 4X2 transmission, begin by cleaning the mating surfaces of the transmission case and the cover. Remove any old gasket material. Apply a thin film of transmission housing sealant to the cover flange. Position the cover over the PTO opening and align the four bolt holes. Insert each w/o PTO bolt by hand to ensure no cross threading. Using a torque wrench set to 50 Nm, tighten the bolts in a cross pattern (opposite corners) to ensure even compression of the gasket.
After the first pass, re check each bolt at 50 Nm. Do not exceed the specified torque, as The part mounting bosses could crack. If any bolt does not reach the required torque, replace it with a new w/o PTO fastener. After tightening, run the engine and check for oil leaks around the cover. The pre applied thread locking patch on The part bolts will cure within 24 hours; avoid disturbing the bolts during that period.
If a w/o PTO bolt becomes loose after installation, the most common cause is using a bolt that does not have a locking patch or reusing an old bolt. Always use new w/o PTO fasteners. If the bolt turns freely before reaching 50 Nm, the threads in the transmission housing may be stripped. Repair the threads with a thread insert (heli coil) of size M10x1.5, then install a new w/o PTO bolt.
If oil leaks from around the cover despite correct bolt torque, inspect the gasket or sealant. The cover flange may be warped; replace the cover if necessary. If a w/o PTO bolt breaks during tightening, it is usually due to an overtightening or a defective bolt. Remove the broken piece using a bolt extractor and install a new bolt with a torque wrench set to 50 Nm. Never use a bolt that is longer than 40mm; it could contact internal transmission components.
The part cover and its bolts do not require regular maintenance, but they should be inspected during any transmission service or during annual vehicle inspections. Check The part bolts for signs of rust; if corrosion is present, replace the bolts. Use a torque wrench to verify that each bolt still holds 50 Nm. If any bolt has loosened, remove it, clean the threads, and install a new w/o PTO fastener with fresh thread locker.
Inspect the cover for cracks or oil seepage. If The part cover has been removed for any reason, always replace the bolts with new ones. The original bolts will have had their locking patch crushed and may have been stretched. Storing spare w/o PTO bolts in the service truck is recommended for roadside repairs.
This w/o PTO bolt is specifically designed for the 16 speed manual transmission used in HOWO MAX 4X2 tractors, as well as in SITRAK C7H and HOWO T7H trucks that are ordered without a PTO. The bolt fits the threaded bosses that are cast into the transmission case for PTO mounting.
It is also used on the engine flywheel housing in some w/o PTO configurations where a PTO would otherwise mount. This w/o PTO fastener is compatible with all production years from 2018 onward. It is not compatible with older ZF transmissions or with WD615 engine drivelines. Always verify the transmission model and the thickness of the PTO cover before ordering this w/o PTO kit.
Aftermarket bolts sold as “PTO cover bolts” are often property class 8.8 and lack the thread locking patch. Using an inferior bolt on a w/o PTO cover can lead to the bolt loosening under the intense vibration of a diesel engine. A loose w/o PTO cover can eventually fall off, allowing the transmission to drain its oil while the truck is moving, resulting in catastrophic damage to the gearbox and possibly a lock up of the drive wheels.
The genuine w/o PTO bolt meets the MAN183 standard, which includes rigorous tensile, hardness, and thread locking performance tests. The small additional cost of a genuine w/o PTO fastener is nothing compared to the cost of rebuilding or replacing a transmission. For fleet operators, standardizing on genuine w/o PTO bolts ensures every PTO cover is secured with the correct hardware, preventing downtime and safety incidents.
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