D75s-2 Transmission Parts Gear Pump 07428-71202 for Bulldozer

High quality D75S-2 Transmission Parts Gear Pump 07428-71202 for Bulldozer

What is a gear pump?

A gear pump is a type of positive displacement (PD) pump. It moves a fluid by repeatedly enclosing a fixed volume using interlocking cogs or gears, transferring it mechanically using a cyclic pumping action. It delivers a smooth pulse-free flow proportional to the rotational speed of its gears.

Gear pumps use the actions of rotating cogs or gears to transfer fluids.  The rotating element develops a liquid seal with the pump casing and creates suction at the pump inlet.  Fluid, drawn into the pump, is enclosed within the cavities of its rotating gears and transferred to the discharge. There are two basic designs of gear pump: external and internal gear pump.

What are the main features and benefits of a gear pump?

Gear pumps are compact and simple with a limited number of moving parts. They are unable to match the pressure generated by reciprocating pumps or the flow rates of centrifugal pumps but offer higher pressures and throughputs than vane or lobe pumps. Gear pumps are particularly suited for pumping oils and other high viscosity fluids.

Of the two designs, external gear pumps are capable of sustaining higher pressures (up to 3000 psi) and flow rates because of the more rigid shaft support and closer tolerances. Internal gear pumps have better suction capabilities and are suited to high viscosity fluids, although they have a useful operating range from 1cP to over 1,000,000cP. Since output is directly proportional to rotational speed, gear pumps are commonly used for metering and blending operations. Gear pumps can be engineered to handle aggressive liquids. While they are commonly made from cast iron or stainless steel, new alloys and composites allow the pumps to handle corrosive liquids such as sulphuric acid, sodium hypochlorite, ferric chloride and sodium hydroxide.

External gear pumps can also be used in hydraulic power applications, typically in vehicles, lifting machinery and mobile plant equipment. Driving a gear pump in reverse, using oil pumped from elsewhere in a system (normally by a tandem pump in the engine), creates a hydraulic motor. This is particularly useful to provide power in areas where electrical equipment is bulky, costly or inconvenient. Tractors, for example, rely on engine-driven external gear pumps to power their services.

Basic design and construction of the external gear pumps:

External gear pumps, the most popular pumps used in modern hydraulics systems. These hydraulic gear pumps and motors can work under heavy duty operating conditions and transmit high hydraulic power, feature good hydraulic, mechanical and volumetric efficiency, low noise level and, last but not least, compact dimensions and low weight to power ratio. Ideal for both industrial and mobile industry sectors.

The basic components consist of a gear set supported by two aluminum bushings, a body, a securing flange and a cover. The shaft of the driving gear projecting beyond the flange mounts a seal ring coupled with a metallic ring to strengthen the setup. Both rings are held in place by an elastic securing ring.

The body is made of a special aluminium alloy with high strength for minimized deformation even when subject to high pressure. There are also cast iron bodied pumps and motors now available for applications requiring high pressures, optimal performance and endurance. Flange and cover are made out of cast iron or aluminium alloy, depending on the model series type, manufactured through a process of continuous flow casting and with a final surface treatment of phosphating.

Gears are made of special grade steel. Their manufacturing process includes case-hardening and quench hardening. The gears are ground and fine finished to achieve a high degree of surface finishing. Good tooth profile design and geometric proportions ensure low pulsation levels and low noise levels during motor operation.

Bushings are made of special low-friction and high-resistant aluminium alloy and manufactured from die-casting that have excellent high strength and anti-friction characteristics. Also equipped with anti-friction DU bearings with tight tolerance.

Special and symmetric compensation zones onto bushings, insulated by special preformed seals with special anti-extrusion ring, allow full free axial and radial movement to the bushings, which is proportional to motor operating pressure. In this way, internal leakage is dramatically reduced, ensuring very good pump performance (both in terms of mechanical and total efficiencies) and proper lubrication of pump moving parts.

Why buy Wanxun hydraulic gear pump?

Shaft sleeves are imported from DAIDO Japan.

Oil sealing is made by NOK Japan.

Hydraulic pump Case is an extrusion molding which is produced by extruding machine (press power is 7200 Ton). 
Pls check pic as below:

Smooth surface, hard density of material.

Complete variety for international pump parts (more than 300 kinds of Hydraulic pumps)


 

Note before quotation:

For fast and accurate quotation information, we need more details:

Your specs model of construction Vehicle

The hydraulic pump part number  (most important)

The photos of pump

The direction of rotation for the pump (anticlockwise or  clockwise)

Installation and operation manual of the gear pump:

The Hydraulic Oil must be clean and fresh, the bad condition of Oil will damage and reduce working life of pump. Please add in HYD Oil in the pump before installation. It will affect working efficiency of pumps when the old pump and new pump connect.

In developed industry market, the spare parts of gear pump achieved sophisticated. Therefore, check of clean oil with operation before using pump. The installation should be according to the ex-works technical documents of gear pump, and related specification of this manual, also the pump structure should be taken into consideration.

1. Oil liquid cleanliness standard requirements up to NSA10 level---NSA11 Level (The average value of contamination performance indicators less CB/T14039-2002rule 19/16).In others words, when using new products, oil storage tank must be cleaned completely or oil filter vehicle should carried out clean the oil, and update filter. (New products and badly worn pump can also cause technical damaged problem),once iron pin entry into new-pump with oil. The customer must ensure clean oil-channel and take oil tank, update filter.)

2. Program of pump drive shaft and machine output shaft is Max.0.05mm.The inside of spline bushing worn parts has been replaced at the proper time, or coaxial degree might have influence. Measurement the pump of brack installation and connection structure verticality is less 0.05mm. Machine drive and pump drive shaft concentricity is within 0.05mm.

3. When replace new pump, it requires filling up with hydraulic oil from inlet position and turning a half circle to pump rotation. After installing, keep running 20 mins with low speed, check the connecting head and seal ring to make sure there is not leak oil or leak out of this pipe.  The machine will not run and burn shaft, if pressure is insufficient. In addition, check safety valves to make sure pump works smoothly. Gear pump overload (allowed 1.15 times under rated of pressure instantaneous overload about 1min) is allowed less than one minute.  Otherwise, it occurs leak oil, broke shaft, etc.

Application for komat-su/Shantui/Kawasaki/Cater-pi-ll-ar machine:

Wanxun Hydraulic Gear Pump Factory Show:

More than 30 years experience in gear pump design and research. Professional specialized in hydraulic pump components of Koma-tsu construction Vehicle since 1983. We care much on the quality control system in each step, from the raw material choosen, machine use, professional worker to make sure client get the best quality product!

Our products include: Koma-tsu and Cater-pi-llar Steering pumps, hydraulic pumps, gear pumps, work pumps, valves, crankshafts, frictions, PCBN, pistons, Shan Tui torques, bearings, cylinder sleeves, piston rings, motors, generators, filter elements, service kits, superchargers and fuel injectors. Our products are used in bulldozers, loaders, excavators, such as D80A-12, D85A-18, D150A-1, D155A-1, D155A-3, D355A-3, WA470, WA470-3, WA500-3, Shan Tui, Huang He TY130, TY160, TY180, TY220, TY230, TY320, SD13, SD16, SD22, SD42 and SD42-3.

We have professional personnel and equipment to design as you request as long as you provide a sample or detailed drawings.
 

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