Model: YC4108
Part Number: D30-1011100
Brands: Yuchai
Engine Model: YC4108
Engine Type: Diesel
Scope of application: light and medium trucks, agricultural machinery, generator sets, marine auxiliary
Part D30-1011100 is the gear-type oil pump for the Yuchai YC4108, drawing oil from the sump, pressurising it and feeding the main and rod bearings, the camshaft and the valve train. On this engine the pump is driven from the front of the engine and fitted with an integrated relief valve.
The YC4108 is a simple, robust engine that works hard in agricultural and construction duty. Oil pressure is its first line of defence, and a pump that has lost volume shows up first as a slow drop at hot idle rather than as a sudden warning.
The pump fits YC4108 engines in light and medium trucks, agricultural machinery and gensets. Confirm the engine plate and the old pump number before ordering, because Yuchai built the 4108 in several variants with different front cover arrangements.
Pumps ship oiled and plugged, with the drive gear fitted as original.
Check oil level and condition, replace the filter, inspect the strainer, then measure pressure with a mechanical gauge. Only after those steps should the relief valve and pump come under suspicion. A blocked strainer imitates a worn pump exactly, and it is far cheaper to fix.
Many YC4108 engines work in fields and construction sites where dust is constant. Dust that reaches the oil accelerates wear on the pump gears and the bearings downstream. Keep the air filter sealing properly and change the oil at the severe-duty interval rather than the standard one.
Match the part number and the front cover type. If the engine has been rebuilt with a replacement cover, check that the mounting face matches. Send a photo of the old pump beside a ruler and we will confirm the casting before shipping.
After assembly, measure pressure at cold idle, hot idle and rated speed. A pump that holds rated pressure but drops at hot idle usually has worn bearings downstream rather than a pump fault. Record the figures in the engine log for the next service.
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.
The grade of oil affects the pressure you read on the gauge. A thinner oil gives lower pressure at hot idle, which can look like a worn pump when the pump is fine. If pressure seems low after a service, confirm that the correct grade was used before ordering parts.
In hot climates, some operators use a heavier grade to compensate for temperature, but that changes flow to the bearings and the turbo. Follow the engine specification rather than local habit, and record the grade used in the engine log.
Agricultural users often run several identical machines and cannot afford a long wait for parts. A pump, a gasket and an oil filter on the shelf cost little and can restore a machine in an afternoon instead of a week. Share the spares across the fleet rather than buying per machine.
Record the pump part number on each machine's service sheet. Yuchai built the 4108 in variants, and assuming all machines are identical is how the wrong part gets ordered under pressure.
Yes, the mounting gasket is supplied.
Yes. A blocked strainer, stuck relief valve, worn bearings or a faulty sender all mimic pump failure.
The pump comes with its gear fitted as original.
At every major overhaul, or when the front cover is removed.
Browse the Yuchai pump category, and pair the pump with the YC4108 water pump D0305-1307020B or the YC4108 crankshaft B8800-1005001B.
Yuchai YC4108 Oil Pump (1011100). The oil pump moves a fixed volume per revolution. Pressure is created by the resistance that volume meets in the galleries and bearings, not by the pump alone.
Compare the old pump number and photograph the drive end. A pump with the wrong drive bolts up and fails to feed correctly.
Numbers beginning 1011 belong to the numeric series used on WP9 and later engines, typically for accessories and pumps. On this engine, confirm the YC4108 application against the engine plate before ordering.
Replace the suction-side O-rings and gaskets with the pump. A hardened O-ring at the pick-up joint draws air and reproduces exactly the symptom the new pump was meant to cure.
Ordering note. Warranty is twelve months against manufacturing defects. Failures caused by incorrect clearance, overheating or debris are assessed on the returned part rather than refused outright.
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: YC4108, 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 |
Pumps ship oiled and plugged, with the drive gear fitted as original.
Check oil level and condition, replace the filter, inspect the strainer, then measure pressure with a mechanical gauge. Only after those steps should the relief valve and pump come under suspicion. A blocked strainer imitates a worn pump exactly, and it is far cheaper to fix.
Many YC4108 engines work in fields and construction sites where dust is constant. Dust that reaches the oil accelerates wear on the pump gears and the bearings downstream. Keep the air filter sealing properly and change the oil at the severe-duty interval rather than the standard one.
Match the part number and the front cover type. If the engine has been rebuilt with a replacement cover, check that the mounting face matches. Send a photo of the old pump beside a ruler and we will confirm the casting before shipping.
After assembly, measure pressure at cold idle, hot idle and rated speed. A pump that holds rated pressure but drops at hot idle usually has worn bearings downstream rather than a pump fault. Record the figures in the engine log for the next service.
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.
The grade of oil affects the pressure you read on the gauge. A thinner oil gives lower pressure at hot idle, which can look like a worn pump when the pump is fine. If pressure seems low after a service, confirm that the correct grade was used before ordering parts.
In hot climates, some operators use a heavier grade to compensate for temperature, but that changes flow to the bearings and the turbo. Follow the engine specification rather than local habit, and record the grade used in the engine log.
Agricultural users often run several identical machines and cannot afford a long wait for parts. A pump, a gasket and an oil filter on the shelf cost little and can restore a machine in an afternoon instead of a week. Share the spares across the fleet rather than buying per machine.
Record the pump part number on each machine's service sheet. Yuchai built the 4108 in variants, and assuming all machines are identical is how the wrong part gets ordered under pressure.
Browse the Yuchai pump category, and pair the pump with the YC4108 water pump D0305-1307020B or the YC4108 crankshaft B8800-1005001B.
Yes, the mounting gasket is supplied.
Yes. A blocked strainer, stuck relief valve, worn bearings or a faulty sender all mimic pump failure.
The pump comes with its gear fitted as original.
At every major overhaul, or when the front cover is removed.
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.
