Model: WP12 / WD618
Part Number: 612600081228
Brands: Weichai Power
Engine Model: WP12, WD12, WD618, WP12.430, WP12.460
Engine Type: Diesel
Scope of application: heavy trucks, mining equipment, construction machinery, marine and generator engines
The oil pump is the heart of the lubrication system. On the Weichai WP12 and WD618 engines, part 612600081228 draws oil from the sump, pressurises it and pushes it through the filter, main galleries, crankshaft and up to the cylinder head. Everything that moves inside the engine depends on this constant supply. A pump that is worn, leaking internally or stuck on its relief valve will starve the bearings long before the oil pressure warning light becomes obvious.
Because the WP12 is a high-load engine used in mining and long-haul duty, the oil pump works harder than on a light vehicle. Replacing it during an overhaul is cheap insurance compared with a spun bearing or a scored crankshaft.
The pump fits the 12-litre Weichai family: WP12 and WD12 road engines and the WD618 marine and industrial variants. Typical installations include HOWO and Shacman heavy tractors, mining dump trucks, large excavators, marine auxiliary engines and generator sets. The pump is driven from the crankshaft gear train, so it shares wear with the front-end gears and should be inspected whenever the timing cover is off.
Confirm the engine model and the old pump number before ordering. Some marine and industrial versions use a different pick-up arrangement even though the pump body looks identical.
Our pumps are built with hardened steel gears running in a machined housing, with an integrated relief valve that limits maximum pressure. Each unit is checked on a test bench before packing:
The drive gear is matched to the shaft and pinned or keyed as original, so the pump will not slip timing. Pumps are shipped oiled and plugged to keep dust out of the galleries.
Never diagnose low oil pressure from the dash gauge alone. Verify with a mechanical gauge at the main gallery before replacing parts, and always check the pick-up screen for a blocked strainer first.
Two numbers decide the fit: the engine model and the pump part number. WP12 and WD618 pumps look similar but the pick-up and drive details differ between road and marine versions. If you are replacing a pump on a rebuilt engine, check that the front cover has not been swapped for a different variant.
For fleets, keep a spare pump on the shelf together with a gasket and O-ring set. Oil pump failure is rare but sudden, and a spare turns a two-week downtime into an afternoon job.
Most premature pump failures are caused by contaminated oil. Use the specified oil grade, change it at the severe-duty interval, and never run the engine with a damaged air filter or a leaking injector that dilutes the oil with diesel. Keep the cooling system healthy as well: sustained overheating thins the oil and reduces its lubricating ability.
Yes, the mounting gasket and O-ring are included. We recommend replacing the pick-up O-ring at the same time.
Yes. A blocked pick-up strainer, a stuck relief valve, worn main bearings or a faulty pressure sender can all produce the same symptom. Test with a mechanical gauge first.
The pump is supplied with its drive gear fitted and timed as original.
At every major overhaul, or whenever the timing cover is removed for another reason. It is inexpensive compared with the damage a failure causes.
See the complete Weichai pump range, and pair the pump with a WP12 piston kit 612630900001 or the WD618 overhaul repair kit 612600900080.
We offer OEM quality and excellent after-sales service as a complementary option. Engine brands supported include Weichai, Baudouin, Yuchai, Caterpillar, FAW Xichai, Sinotruk, Cummins and other engine parts. Specifically engine overhaul kits, pistons, cylinder liners, crankshafts, camshafts, fuel pumps, water pumps, lube pumps, injectors, and other performance parts.
If you are not sure about the part number that you need, please provide all the information you have, such as the equipment nameplate, engine nameplate or engine number, or real photos.
The oil pump is the heart of the lubrication system. On the Weichai WP12 and WD618 engines, part 612600081228 draws oil from the sump, pressurises it and pushes it through the filter, main galleries, crankshaft and up to the cylinder head. Everything that moves inside the engine depends on this constant supply. A pump that is worn, leaking internally or stuck on its relief valve will starve the bearings long before the oil pressure warning light becomes obvious.
Because the WP12 is a high-load engine used in mining and long-haul duty, the oil pump works harder than on a light vehicle. Replacing it during an overhaul is cheap insurance compared with a spun bearing or a scored crankshaft.
The pump fits the 12-litre Weichai family: WP12 and WD12 road engines and the WD618 marine and industrial variants. Typical installations include HOWO and Shacman heavy tractors, mining dump trucks, large excavators, marine auxiliary engines and generator sets. The pump is driven from the crankshaft gear train, so it shares wear with the front-end gears and should be inspected whenever the timing cover is off.
Confirm the engine model and the old pump number before ordering. Some marine and industrial versions use a different pick-up arrangement even though the pump body looks identical.
| We Are 30 Years Diesel Engine Parts Supplier | |
| Brand | EPID |
| Warranty | 12 Months |
| Condition | 100%New |
| More Models | Weichai: WP12, WD12, WD618, WP12.430, WP12.460, and other Weichai series. |
| Shipping | By sea / air / express (DHL, FEDEX, TNT, UPS, EMS) |
| Packing | Standard exporting packing or as required |
| Payment Term | L/C, T/T, Western Union, Trade Assurance |
| Delivery Time | 3-7 days (depend on order) |
| Selling Point | 1. On-time Delivery 2. Genuine Quality Assurance 3. Professional Supplier |
Our pumps are built with hardened steel gears running in a machined housing, with an integrated relief valve that limits maximum pressure. Each unit is checked on a test bench before packing:
The drive gear is matched to the shaft and pinned or keyed as original, so the pump will not slip timing. Pumps are shipped oiled and plugged to keep dust out of the galleries.
Never diagnose low oil pressure from the dash gauge alone. Verify with a mechanical gauge at the main gallery before replacing parts, and always check the pick-up screen for a blocked strainer first.
Two numbers decide the fit: the engine model and the pump part number. WP12 and WD618 pumps look similar but the pick-up and drive details differ between road and marine versions. If you are replacing a pump on a rebuilt engine, check that the front cover has not been swapped for a different variant.
For fleets, keep a spare pump on the shelf together with a gasket and O-ring set. Oil pump failure is rare but sudden, and a spare turns a two-week downtime into an afternoon job.
Most premature pump failures are caused by contaminated oil. Use the specified oil grade, change it at the severe-duty interval, and never run the engine with a damaged air filter or a leaking injector that dilutes the oil with diesel. Keep the cooling system healthy as well: sustained overheating thins the oil and reduces its lubricating ability.
See the complete Weichai pump range, and pair the pump with a WP12 piston kit 612630900001 or the WD618 overhaul repair kit 612600900080.
Yes, the mounting gasket and O-ring are included. We recommend replacing the pick-up O-ring at the same time.
Yes. A blocked pick-up strainer, a stuck relief valve, worn main bearings or a faulty pressure sender can all produce the same symptom. Test with a mechanical gauge first.
The pump is supplied with its drive gear fitted and timed as original.
At every major overhaul, or whenever the timing cover is removed for another reason. It is inexpensive compared with the damage a failure causes.
EPID supplies diesel engine parts for Weichai, Baudouin, Yuchai, Caterpillar, Sinotruk, FAW Xichai and Cummins engines. Every order is checked against the original part number before packing, and our team can identify a part from a photo of the engine plate. Ask for a quotation with your model and quantity and we will reply within one working day.
