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- Wanda Plaza, Jinan, Shandong, China
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- info@deruna.com
Efficient manual lubrication for heavy-duty chassis and steering components – The OEM WG4075450065 Hydraulic Manual Oil Pump is designed to provide reliable, high‑pressure oil delivery for centralized lubrication systems on SINOTRUK HOWO, SHACMAN, and other heavy commercial vehicles. It enables precise greasing of kingpins, tie rods, and fifth wheels.
This hand‑operated pump is built with a durable cast iron body, hardened steel plunger, and high‑quality seals to withstand extreme pressures up to 400 bar. For guaranteed compatibility and long service life, always choose genuine Sinotruk Homan parts.
The WG4075450065 Hydraulic Manual Oil Pump features an integrated pressure relief valve, a large‑capacity oil reservoir, and a smooth lever action that reduces operator fatigue. It is ideal for emergency lubrication, pre‑start priming, and maintenance in remote locations where compressed air is not available.
The WG4075450065 Hydraulic Manual Oil Pump is engineered for high‑reliability applications in off‑road and on‑road heavy vehicles. Unlike electric pumps, it does not require a power source, making it perfect for emergency field repairs and remote sites.
The double‑acting plunger design delivers oil on both the forward and return strokes, achieving a flow rate of 0.25 mL per stroke at full pressure. The integrated overflow valve protects the system from over‑pressurization, and the filter screen prevents debris from entering the hydraulic lines.
Fleet maintenance teams using the WG4075450065 report that it reduces lubrication time by 50% compared to manual grease guns, especially when servicing multiple fittings on a single truck. The pump can handle oils from SAE 10W to SAE 140 and standard lithium greases up to NLGI #2.
High‑pressure capability ensures grease reaches even the most stubborn kingpin and slack adjuster fittings, eliminating dry joints.
Long, rubber‑grip handle reduces required force by 30% compared to standard pumps, minimizing operator strain during daily servicing.
2.5 liter transparent polycarbonate tank with graduations lets you monitor oil level, compatible with all mineral and synthetic oils.
| OEM Number | WG4075450065 |
| Product Name | Hydraulic Manual Oil Pump (Hand‑Operated) |
| Brand | SINOTRUK Homan |
| Pump Type | Double‑acting piston plunger pump |
| Max Operating Pressure | 400 bar (5,800 psi) |
| Displacement per Stroke | 0.25 mL (both forward and return) |
| Reservoir Capacity | 2.5 liters (transparent polycarbonate with scale) |
| Relief Valve Setting | 420 bar ±10 bar (factory preset) |
| Inlet Filter | 100 µm stainless steel mesh, removable |
| Outlet Connection | G1/4″ BSPP male, with captive dust cap |
| Body Material | Ductile cast iron (QT500‑7) with black powder coat |
| Plunger & Piston Material | Hardened and ground alloy steel (HRC 58‑62) |
| Seals Material | Nitrile rubber (NBR) + polyurethane (PU) backup rings |
| Viscosity Range | 10 – 1500 cSt (SAE 10W to SAE 140, NLGI #2 grease) |
| Operating Temperature | -20°C to +80°C (tank material limits 60°C continuous) |
The WG4075450065 uses a precision‑honed cylinder bore and a lapped steel plunger to achieve near‑zero internal leakage. The double‑acting design means that both the push and pull strokes deliver oil, providing a consistent flow without dead space.
A positive‑sealing inlet check ball and an outlet check ball prevent backflow and maintain prime even when the pump is stored vertically. The integrated pressure relief valve can be adjusted (factory set) to avoid damaging downstream components such as metering valves or hoses.
The pump body is machined on CNC equipment with a surface finish of Ra 0.8 µm on all sealing lands, ensuring long seal life. The handle is designed with a 3:1 lever ratio, requiring only 30 kg of force to reach 400 bar output.
The housing of the WG4075450065 is ductile cast iron, chosen for its high tensile strength (500 MPa) and excellent vibration damping. The powder coat finish is resistant to oil, diesel, and road salt.
The plunger and piston are made of bearing‑grade steel, induction‑hardened to 58‑62 HRC, then superfinished to reduce friction. All seals are nitrile rubber with polyurethane backup rings rated for 500 bar working pressure.
The transparent reservoir is made of impact‑resistant polycarbonate that withstands drops and chemical exposure. Graduations in liters and gallons help track oil usage.
The WG4075450065 can be used to lubricate steering linkage, fifth wheel plates, brake S‑cam bushings, and universal joints. It also works as a portable hydraulic power source for small cylinders (e.g., pressing bearings).
To operate, fill the tank with the recommended oil or grease (thick greases require dilution or use of a follower plate). Connect the outlet hose to the fitting, then stroke the lever fully. The pump self‑primes within 3‑5 strokes.
When not in use, store the pump with the lever in the upright position to relieve pressure. The included dust cap on the outlet port keeps contaminants out. The pump can be mounted on a service truck via the pre‑drilled base holes.
To safely operate the WG4075450065 Hydraulic Manual Oil Pump: 1) Ensure the tank is filled with clean oil or grease of the recommended grade. Do not exceed the max fill line.
2) Connect a compatible high‑pressure hose (rated ≥ 400 bar) to the outlet port. Tighten securely by hand plus 1/4 turn with a wrench. 3) Attach the hose end to the grease fitting or hydraulic inlet on the equipment.
4) Slowly stroke the lever through its full range. If resistance is felt immediately, verify that the fitting is not blocked. 5) Pump until the required amount of lubricant has been delivered or until the pressure relief valve opens.
6) After use, remove the hose, clean any spilled oil, and store the pump with the lever in the released position. Do not leave the pump under pressure for extended periods.
The WG4075450065 requires minimal maintenance. Inspect the pump annually for oil leaks, damaged seals, or a stuck pressure relief valve. Clean the inlet filter (located under the filler cap) every 500 operating cycles.
If the pump fails to build pressure, check that the tank has oil, the inlet filter is not clogged, and the outlet hose is not blocked. If the lever moves with no resistance, the check balls may be stuck; disassemble and clean (service kit available).
If oil leaks from the plunger area, replace the plunger seal using the genuine repair kit. Do not overfill the tank, as oil expansion may cause leakage through the breather cap.
Each WG4075450065 Hydraulic Manual Oil Pump is manufactured under ISO 9001:2015 and IATF 16949 certified systems. Type tests include: (1) Pressure test at 500 bar (1 minute, no leakage), (2) Endurance test (100,000 full strokes at 300 bar), (3) Seal compatibility test (immersion in oil at 80°C for 168 hours).
(4) Low‑temperature operation test (−20°C, 500 cycles), (5) Dimensional inspection of all critical parts (plunger bore, ball seats), (6) Relief valve calibration (checked at 420 bar with traceable gauge).
Each pump is individually serialized and comes with a test report. The pump meets the requirements of ISO 1219 for hydraulic hand pumps and is CE marked.
A municipal bus depot in Berlin equipped their maintenance bays with the WG4075450065 pump for greasing steering knuckles. After two years, mechanics reported that the pump’s high pressure cleared blocked fittings that other pumps could not, reducing suspension component replacement by 15%.
An agricultural contractor in Brazil uses the WG4075450065 to fill hydraulic reservoirs on harvesters. The large tank and quick priming ability saved 45 minutes per machine compared to using funnel and bucket methods. The pump also proved resistant to sugar cane dust contamination.
Each WG4075450065 Hydraulic Manual Oil Pump is supplied in a heavy‑duty cardboard box with foam cutouts securing the pump body, lever, and accessories (two hose connectors and a spare filter).
A tamper‑evident holographic sticker with the SINOTRUK Homan logo is affixed to the pump body. A QR code on the box directs to the authenticity verification page. Counterfeit pumps often have rough castings, missing relief valves, or plastic plungers. Genuine units have a smooth cast‑iron body and a laser‑etched serial number.
Always purchase from authorized distributors. The genuine pump includes a multi‑language manual and a 2‑year limited warranty against manufacturing defects.
Summary: The SINOTRUK Homan Hydraulic Manual Oil Pump (OEM WG4075450065) delivers reliable, high‑pressure lubrication for heavy‑duty vehicle chassis and hydraulic systems. Upgrade your maintenance toolkit with this genuine OEM hand pump – the durable choice for fast, effective servicing anywhere.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
We are a first-class heavy duty vehicles and spare parts supplier in China. which covers from engine, gearbox, cab, axle assemblies to main assembly accessories, electrical parts and other chassis parts like brake, clutch and steering parts.
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