Model: WP7 / WP8
Part Number: 610800070312
Brands: Weichai Power
Engine Model: WP7, WP7H, WP8, WP8H
Engine Type: Diesel
Scope of application: medium and heavy trucks, buses, construction machinery, generator sets
Oil pressure is the engine's first line of defence. On the Weichai WP7 and WP8, part 610800070312 is the gear-type oil pump that draws oil from the sump, pressurises it and pushes it through the filter, main galleries, crankshaft and up to the cylinder head. It also feeds the piston cooling jets on this engine family, which is why flow matters as much as pressure.
The pump is driven from the front of the engine and fitted with an integrated relief valve. When it wears, the symptom is rarely a sudden warning light. Pressure falls slowly at hot idle, oil temperature rises and bearing wear begins long before the driver notices anything.
The pump fits WP7, WP7H, WP8 and WP8H engines in trucks, buses, loaders and generator sets. Confirm the engine plate and the old pump number before ordering. Industrial and marine variants can use a different pick-up arrangement even when the pump body looks identical, and a mismatched pick-up starves the pump at high load.
Every pump is run on a test bench rather than only inspected. Flow is measured at rated speed and compared with the original curve. The relief valve is opened and the pressure recorded. Gear backlash and end clearance are measured because they decide volumetric efficiency, and the housing and pick-up joint are leak tested.
Pumps ship oiled and plugged so no dust enters the galleries, with the drive gear fitted and keyed as original.
Confirm with a mechanical gauge at the main gallery before replacing parts. A blocked pick-up strainer imitates a worn pump exactly, and so does a tired sender.
Work through the system in a fixed order so that no cause is missed. Check oil level and condition, replace the filter, inspect the strainer for a blocked mesh, then measure pressure with a mechanical gauge. Only after those steps should the relief valve and the pump come under suspicion.
Pressure that is low only when hot points to worn bearings as much as a worn pump. Pressure that recovers instantly with engine speed points to the relief valve or pump clearances. Recording cold idle, hot idle and rated speed gives a clear diagnosis and avoids buying parts that are not needed.
Match part number, engine rating and drive type. If the engine has been rebuilt with a replacement front cover, check that the pump mounting face and the drive gear match. Send a photo of the old pump next to a ruler and we will confirm the casting before shipping.
On these engines the pump also supplies the piston cooling jets. A pump that delivers pressure but not enough volume will still allow piston crown temperatures to climb, and the damage appears as a cracked or scored piston rather than as low oil pressure. If pistons have failed without an obvious cause, measure oil flow before blaming the pistons.
Most premature failures come from contaminated oil. Use the specified grade, change it at the severe-duty interval and never run with a leaking injector that thins the oil with diesel. Keep the cooling system healthy too, because sustained overheating thins oil and reduces film strength at the bearings.
Yes, the mounting gasket and O-ring are supplied. Replace the pick-up O-ring at the same time.
Yes. A blocked strainer, stuck relief valve, worn bearings or a faulty sender all produce the same symptom.
The pump comes with its drive gear fitted and timed as original.
At every major overhaul, or whenever the front cover is removed for another repair.
Browse the Weichai pump category, and pair the pump with the WP7 and WP8 piston 610800030035 or the WP7 and WP8 water pump 1001996660.
Weichai WP7 Oil Pump (610800070312). This pump supplies the oil film that every bearing depends on. Its output is fixed per revolution, so pressure is decided by clearances downstream as much as by the pump.
Ask whether the relief valve is set for your application. The valve is part of the assembly on these units and its setting is not adjustable in service.
Numbers beginning 6108 belong to the WP7 and WP8 families. These engines share architecture but differ in detail, so a part that fits one will not necessarily suit the other without checking the casting. On this engine, confirm the WP7 application against the engine plate before ordering.
Prime the pump before the first start and confirm oil pressure at the gauge before allowing the engine to run. Never crank a fresh rebuild hoping pressure will arrive.
Ordering note. Packing is export grade: each unit is wrapped, boxed and palletised for sea freight, with the part number marked on the outside so the receiving store can book it in without opening the carton.
Related reading: Oil Pump Diagnosis: Low Pressure, Wear and Replacement
| We Are 30 Years Diesel Engine Parts Supplier | |
| Brand | EPID |
| Warranty | 12 Months |
| Condition | 100%New |
| More Models | Weichai: WP7, WP7H, WP8, WP8H, 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 |
Every pump is run on a test bench rather than only inspected. Flow is measured at rated speed and compared with the original curve. The relief valve is opened and the pressure recorded. Gear backlash and end clearance are measured because they decide volumetric efficiency, and the housing and pick-up joint are leak tested.
Pumps ship oiled and plugged so no dust enters the galleries, with the drive gear fitted and keyed as original.
Confirm with a mechanical gauge at the main gallery before replacing parts. A blocked pick-up strainer imitates a worn pump exactly, and so does a tired sender.
Work through the system in a fixed order so that no cause is missed. Check oil level and condition, replace the filter, inspect the strainer for a blocked mesh, then measure pressure with a mechanical gauge. Only after those steps should the relief valve and the pump come under suspicion.
Pressure that is low only when hot points to worn bearings as much as a worn pump. Pressure that recovers instantly with engine speed points to the relief valve or pump clearances. Recording cold idle, hot idle and rated speed gives a clear diagnosis and avoids buying parts that are not needed.
Match part number, engine rating and drive type. If the engine has been rebuilt with a replacement front cover, check that the pump mounting face and the drive gear match. Send a photo of the old pump next to a ruler and we will confirm the casting before shipping.
On these engines the pump also supplies the piston cooling jets. A pump that delivers pressure but not enough volume will still allow piston crown temperatures to climb, and the damage appears as a cracked or scored piston rather than as low oil pressure. If pistons have failed without an obvious cause, measure oil flow before blaming the pistons.
Most premature failures come from contaminated oil. Use the specified grade, change it at the severe-duty interval and never run with a leaking injector that thins the oil with diesel. Keep the cooling system healthy too, because sustained overheating thins oil and reduces film strength at the bearings.
Browse the Weichai pump category, and pair the pump with the WP7 and WP8 piston 610800030035 or the WP7 and WP8 water pump 1001996660.
Yes, the mounting gasket and O-ring are supplied. Replace the pick-up O-ring at the same time.
Yes. A blocked strainer, stuck relief valve, worn bearings or a faulty sender all produce the same symptom.
The pump comes with its drive gear fitted and timed as original.
At every major overhaul, or whenever the front cover is removed for another repair.
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.
