How to Read Sinotruk HOWO Part Numbers: WG, AZ and VG Explained
Why the part number matters more than the photo
If you run Sinotruk HOWO trucks — the 7 (SG), 7 (ZZ), A7, T7H or T5G series — every replaceable component on the vehicle carries an OEM part number stamped, printed or cast on it. That number is the fastest and safest way for us to quote you: it pins down the exact version, the production year range and the supplier line, so there is no guesswork about fitment.
A clear photo helps, but photos alone often cannot separate two visually identical parts made for different assemblies. The part number can. That is why our first question is always the same: what is the number on the old part?
The three main Sinotruk prefixes: WG, AZ and VG
Sinotruk part numbers follow a structured pattern. The prefix tells you the family and often the assembly group; the digits narrow it down to the exact component.
- AZ — the older classic HOWO series. Most parts for the original 7 (ZZ1167 / ZZ1257) cab, chassis and engine assemblies start with AZ, for example oil tank cap AZ9112550213 or hood hinge AZ1642110017.
- WG — the largest and most current family, covering HOWO A7, T5G, T7H and most common wear parts. Examples: driven plate WG9725161390, clutch booster WG9725230041, shock absorber WG1642240021.
- VG — engine and powertrain internals, mostly for the WD615/WD10 and related engines. Examples: piston VG1540030004, cylinder liner VG1500040065, injector VG1560080276.
The digits after the prefix are grouped by assembly: the first block usually maps to the system (1 = engine area, 2 = transmission/clutch, 3 = chassis and axles, 4 = cab and body, 6 = electrical and air), and the tail digits identify the exact part. You do not need to memorise this — but knowing it exists explains why two numbers that look similar can be completely different parts.
What if the number is worn or missing?
It happens often on mining and construction trucks. Three fallbacks work in this order:
- Vehicle nameplate. Send us the full vehicle VIN / production number from the cab plate. We can look up the BOM and confirm which version of the part your truck was built with.
- Engine or assembly nameplate. For engine parts, the engine model and serial number (Weichai, Sinotruk D10/D12) is usually enough.
- Measurements and photos. Overall size, mounting hole distance and a shot of the mounting side let us match it against the original drawing.
How we confirm before anything ships
Every inquiry goes through the same confirmation loop: number or vehicle info → drawing check → price and lead time → your confirmation → packing. Nothing is dispatched on a guess. If we are not sure, we tell you before you pay, not after.
Send your part number or photos to our inquiry page and you will normally have a confirmed quotation within one working day.
