20-912800 High Pressure Cast Iron Gear Pump 7029122052 JCB 333/G5390 333/G5393 High Power Excavator 20/902900
| Model Number | 20-912800 |
|---|
Product Description
20-912800 High Pressure Cast Iron Gear Pump 7029122052 JCB 333/G5390 333/G5393 High Power Excavator Hydraulic Pump 20/902900
This gear pump is a commonly used fixed displacement gear pump in the hydraulic system of excavators. Its nominal displacement is suitable for the needs of medium and small-sized excavators, ranging from 20 to 25ml/r, and can stably meet the flow supply requirements of the main circuit or pilot circuit. Its rated working pressure can reach 25MPa, and the short-term peak pressure it can withstand can reach 32MPa, which can cope with the frequent load impact conditions in excavation operations.
The rated speed is 2200r/min, and the maximum speed does not exceed 2500r/min. Within this speed range, the stability of the flow output can be maintained. The volumetric efficiency is no less than 90% under rated working conditions, and the total efficiency is no less than 82%, which can effectively reduce energy loss. The pump body is made of high-strength cast iron, and the key parts are equipped with wear-resistant alloy gears. The viscosity range of the compatible hydraulic oil is 20-500mm ²/s. It is recommended to use 46# or 68# anti-wear hydraulic oil. The working temperature adaptation range is -20 ℃ to 80℃, which can adapt to most complex outdoor temperature environments. The installation method adopts the industry-standard flange connection. The overall weight is approximately 14kg. In the model, 20 represents the series code, and 912800 is the exclusive specification and batch code, which is used for precise matching with the corresponding excavator model.Ii. Working Principle
This gear pump follows the core working principle of positive displacement hydraulic pumps. Inside, it consists of a pair of intermeshing driving gears and driven gears, combined with the pump body, end cover and sealing components to form a closed working chamber. When in operation, the driving gear is connected to the power output shaft of the excavator. After starting, it drives the driven gear to rotate synchronously in the opposite direction.
On the side of the oil suction chamber where the gears gradually disengage, the volume of the closed space formed between the teeth keeps increasing, thereby creating a local vacuum. Under the action of atmospheric pressure, the hydraulic oil in the oil tank is sucked into the gap between the teeth through the oil suction port. As the gears continue to rotate, the space between the teeth carrying oil is conveyed to the side of the oil pressure chamber where the gears enter the meshing state. At this time, the volume between the teeth is gradually compressed, and the oil pressure rises. Eventually, it is continuously conveyed to the hydraulic execution circuit of the excavator through the oil pressure port. When the gears rotate in a cycle, a continuous process of “oil suction – oil pressure” is achieved, providing continuous power for the hydraulic system.
Iii. Product Features and Advantages
Excellent pressure resistance and wear resistance: The high-strength cast iron pump body, combined with gears that have undergone surface strengthening treatment, can resist cavity deformation under high-pressure conditions. Meanwhile, the wear resistance of the gears has been significantly enhanced. Even when operating near peak pressure for a long time, the wear on the tooth surface can be reduced. The sealing structure of the key parts adopts a high-pressure resistant design, with extremely low leakage within the rated pressure range, ensuring the stability of the system pressure.
Strong anti-pollution ability: The internal gear meshing clearance has been optimized in design, which has a high tolerance for slight impurities in the hydraulic oil. It can adapt to the outdoor dusty working environment of excavators without the need to install additional high-precision filtration devices, significantly reducing the probability of jamming faults caused by oil contamination.
Stable operation and low noise: The adoption of an optimized involute tooth profile design reduces mechanical shock during gear meshing. Under rated working conditions, the operating noise does not exceed 68dB, which can improve the operating environment for drivers. At the same time, the flow pulsation is relatively small, which can make the movement of components such as the excavator’s boom and bucket smooth and avoid shaking during operation.
Compact structure and easy maintenance: The overall structure is simple, with strong universality of components and no complex control mechanism. It is not only convenient to install and arrange in the compact cabin of the excavator, but also easy to disassemble and replace components during subsequent maintenance, which can shorten the downtime for maintenance.
Iv. Usage Functions and Purposes
The core function of this gear pump is to convert the mechanical energy of the excavator engine into the pressure energy of the hydraulic oil, serving as a power component of the hydraulic system to supply energy to various actuating mechanisms. It can not only actively perform circuit supply of high-pressure oil for the boom lifting, boom extension and retraction, and bucket digging of excavators, ensuring the smooth execution of these core actions; It can also be used as a pilot pump to provide low-pressure oil for the control circuit of the excavator, achieving precise control and action switching of the main circuit.
In addition, it can also cooperate with components such as relief valves and directional control valves in the hydraulic system to regulate the pressure and flow direction of the hydraulic oil, ensuring the coordinated cooperation among different operation actions. It is a key power component for excavators to complete various earthwork and crushing operations and can meet the power requirements of most conventional operations of excavators.
V. Applicable Machines and Scenarios
Compatible machines: The core is compatible with medium and small-sized excavators of 15-25 tons, and it can also be compatible with excavators and loaders of the same tonnage and small crawler excavators. It can match the main hydraulic circuit or auxiliary control circuit of such equipment.
In the field of construction, it can meet the power demands of excavators in operations such as foundation pit excavation and foundation leveling, ensuring continuous and stable movements. In municipal engineering, it is suitable for precise operations during pipeline laying and road maintenance, making the movements of the bucket and boom controllable. In light operations in mines or quarries, its anti-impact and anti-pollution properties can cope with harsh working conditions with a lot of dust and high loads. In addition, it can also be used in the hydraulic systems of large-scale excavating farm tools in agricultural machinery and small-scale mining auxiliary equipment, providing power for their action execution.
Six. Similar models
Model of the same series but different displacement: 20-912801. The displacement of this model has been increased to 30ml/r, with a larger rated flow rate, making it suitable for the main working circuit of large excavators. 20-912799, with a displacement of 18ml/r, is more suitable for the pilot control circuit or auxiliary operation device of small excavators.
Model 20-912802 of the same specification but different configurations, featuring high and low-temperature resistant seals, is suitable for special working environments such as extremely cold at high altitudes or intense sunlight at high temperatures. The 20-912803 model features an automatic axial clearance compensation structure, offering higher volumetric efficiency and is suitable for long-term continuous operation conditions.
Cross-series compatible models: For instance, the gear pump corresponding to a 25ml/r displacement in the CBW series has pressure parameters close to those of this pump and can be used for modification and replacement of auxiliary circuits in excavators. There are also gear pumps of the same pressure level in the CBT-E series. Although there are structural differences, they can meet the basic power requirements of the hydraulic systems of similar excavators.
20/925592 320/08031 20/951276 20/917400 20/905100 20/916000 20/917100 20/908100 20/925340 20/908700 20/925613 20/925338 919/27000
919/27100 332/E6671 286453 20/905300 333/T1003 20/901600 20/92539020/906100 20/902700 332/S4797 20/925591 20/918300 332/F9028
20/925586 333/G5390 332/F9030 20/903200 20/902900 20/912800 20/925580 20/902901 20/925355 20/925744 334/S 2322 JCB TLT 35D 泵部分（序列号
01539000 – 01541999 6111153M92 20/925647 20/925599 20/925688 458/50047 20/902704 332/G5393
20/925366 20/925605 20/917000 20/901100 919/74200 919/72400 20/925498 20/903200KIT 20/912800KIT 919/71700 919/71400 919/66900
332/G6350 3518079M92 332/F9029 333/G5392 333/C5234 919/71800 919/66800 20/925468 3518079M93 20/925337 20/908000 332/F9031
20/925341 332/G6161 20/903700 20/906300 20/903100 20/925732 20/914900 20/918500 20/401900 20/925356 20/925647 20/925687 20/925581
20/925578 20/925579 20/925339 332/F9032 20/925357 20/911200 3518758M91 334/S2322 20/925311 6111153M91 20/925676 38591 6125Z
20/903500
6102161M91 20/925786 20/925786 333/G5391 20/903300 333/W2430 332/T4833 20/903000 332/G7135 20/906800 20/925588 20/925499 334/S2322
20/925340 20/907600 320/08031 320/08031
PGM031、PGM051、PGM075、PGM076、PGM315、PGM330 、PGM350、PGM365、PGM502、PGM503、PGM505、PGM511、PGM517、PGM620
、PGM640、PGP031、PGP050、PGP051、PGP315、PGP330、PGP350、PGP365、PGP502 、PGP503、PGP505、PGP620、PGP640。
PGP517A0230CM2H3NE6E5B1B1
PGP517A0140CD1H3NE6E5B1B1
PGP517A0330AD1H3NP4P3B1B1
PGP517A0330AD1H3NP3P2B1B1
PGP517A0330CD1H3NL3L2B1B1 3339111048
PGP517A0330CD1K6NB1B1D7D5
PGP511A0140CA1H2NE5E3B1B1
PGP517A0380CT1D7VE7E6B1B1
PGP517A0330AD1H3NL3L2B1B1
PGM505A0050BK1H2NE3E3B1B1G4
PGM505A0050BK1H2NE3E3B1B1G4 (3319219028)
PGM511A0110BS4F4NB1B1E3E3G4
PGM511A0230BS8F4NJ5J5B1B1G3
PGM511B0230BS2D3NL2L2B1B1G3 3349219123
PGM517A0330BM1H3NE3E3B1B1G4
PGP511A0140CS1D4NJ9J8B1B1
PGM620A0500BT2L3VT3T3B1B1G4
PGP502A0016CP2D1NJ2J1B1B1 3309111417
PGP502A0043CP2D1NE3E2B1B1 3309111353
PGP505A0030CA1H2NE5E3B1B1
3339111604 PGP517M0440CD1H3NP4P3B1B1
3339111706 PGP517M0440CM1D7NE6E5B1B1
3339111362 PGP517M0440CM1D7NM5M4B1B1
3339111386 PGP517M0440CM1D7NN3N2B1B1
3339111627 PGP517M0440CT1D7NE7E6B1B1
3339111458 PGP517M0440CT1D7NE8E6B1B1
3339111335 PGP517M0440CT1D7NL3L2B1B1
3339111349 PGP517M0440CT1D7NM5M4B1B1
3339111436 PGP517M0440CT1D7NP5P3B1B1
3339111598 PGP517M0440CT2D6NJ9J8B1B1
3339111662 PGP517M0460CD1H3MM5M4B1B1
3339111359 PGP517M0460CG3H3XM5M4B1B1
3339112237 PGP517M0500AD1H3NN3N2B1B1
3339111364 PGP517M0500CG3H3XM5M4B1B1
3339111350 PGP517M0500CM1D7NM5M4B1B1
3339111623 PGP517M0500CT1D7NE7E6B1B1
3339111305 PGP517M0500CT1D7NM5M4B1B1
3339111416 PGP517M0500CT1D7NN3N2B1B1
3339112402 PGP517M0520AD1H3NE8E6B1B1
3339112292 PGP517M0520AT1D7NL3L2B1B1
3339111533 PGP517M0520CD1H3ND7D5B1B1
3339111420 PGP517M0520CD1H3NJ9J8B1B1
3339111687 PGP517M0520CD1H3NP5P3B1B1
3339111459 PGP517M0520CT1D7NE8E6B1B1
3339111336 PGP517M0520CT1D7NL3L2B1B1
3339111599 PGP517M0520CT2D6NJ9J8B1B1
3339112233 PGP517M0580AL4D7NE7E6B1B1
3339111690 PGP517M0580CD1H3NP5E3B1B1
3339111460 PGP517M0580CT1D7NE8E6B1B1
3339111337 PGP517M0580CT1D7NL3L3B1B1
3339111438 PGP517M0580CT1D7NP5P3B1B1
3339111688 PGP517M0700CD1H3NP5P3B1B1
3339111461 PGP517M0700CT1D7NE8E6B1B1
3339111325 PGP517M0700CT1D7NL3L3B1B1
3339112187 PGP517A0120AD1H3NE5E3B1B1
3339112404 PGP517A0140AD1H3VT3T2B1B1
3339112099 PGP517A0140AE1H3NT4T3B1B1
3339112156 PGP517A0140AT1D7NJ9J8B1B1
3339111679 PGP517A0140CD1H3NE6E5B1B1
3339111506 PGP517A0140CD1H3NL3L2B1B1
3339111700 PGP517A0140CD1H3VE6E5B1B1
3339111670 PGP517A0140CD1H3VT3T2B1B1
3339111632 PGP517A0140CT1D7NE6E5B1B1
3339111187 PGP517A0140CT1D7NJ9J8B1B1
3339111503 PGP517A0140CT1D7NL3L2B1B1
3339111430 PGP517A0140CT1D7NT3T2B1B1
3339112414 PGP517A0160AD1H3NB1B1E6E5
3339115007 PGP517A0160AM7L3NE6E5B1B1
3339112430 PGP517A0160AT1D7NL3L2B1B1
3339111707 PGP517A0160CD1H3ML3L2B1B1
3339111653 PGP517A0160CD1H3NB1B1E6E5
3339111569 PGP517A0160CD1H3ND6B1PYBK
3339111643 PGP517A0160CD1H3ND6D5RDPN
3339111682 PGP517A0160CD1H3NE6E5B1B1
3339111507 PGP517A0160CD1H3NL3L2B1B1
3339111697 PGP517A0160CD1H3NL3L2B1B1
3339111712 PGP517A0160CD1H3NP2P2B1B1
3339111633 PGP517A0160CT1D7NE6E5B1B1
3339111505 PGP517A0160CT1D7NL3L2B1B1
3339111429 PGP517A0160CT1D7NP3P2B1B1
3339111611 PGP517A0160CT2D6NJ9J8B1B1
3339112260 PGP517A0190AD1H2NB1B1D7D5
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3339112180 PGP517A0190AD1H3NP3P2B1B1
3339112424 PGP517A0190AD1H3VE6E5B1B1
3339112179 PGP517A0190AD1H3VJ9J8B1B1
Vii. Precautions for Use
Standard installation: During installation, it is necessary to ensure that the coaxiality error between the pump shaft and the power output shaft does not exceed 0.05mm to prevent eccentricity from causing excessive wear of the bearings and abnormal gear meshing. The flange connection bolts should be evenly tightened to avoid oil leakage caused by loose fit of the installation surface. The diameter of the suction pipe should match the inlet diameter of the pump, and the length of the pipeline should be shortened as much as possible to reduce the suction resistance and avoid cavitation.
Strictly control the oil condition: Before the first installation, the hydraulic oil tank and pipelines must be thoroughly cleaned to remove impurities such as welding slag and iron filings. The cleanliness of the hydraulic oil must comply with relevant standards. Regularly check the oil on a daily basis. If emulsification or deterioration occurs, it should be replaced immediately. At the same time, avoid the oil temperature exceeding the suitable range. If the oil temperature is too high, it will accelerate the aging of the sealing parts; if it is too low, it will affect the fluidity of the oil. The oil temperature can be regulated through the system cooling device.
Standardized operation: When starting the excavator, it is necessary to idle to preheat the hydraulic system, gradually increase the system pressure, and avoid damaging the internal structure of the pump body due to sudden high-pressure impact. During operation, avoid keeping the pump in peak pressure condition for a long time to reduce overload operation time. If abnormal heating of the pump body or sudden increase in noise occurs during operation, the machine must be stopped immediately for inspection. Do not force operation.
Regular maintenance and care: The surface of the pump body should be cleaned regularly on a daily basis to prevent the accumulation of dust and oil stains, which may affect heat dissipation. Check the gear meshing clearance and bearing wear every 2000 hours of operation. A comprehensive disassembly and maintenance should be carried out every 5,000 hours. Replace vulnerable parts such as seals. When reassembling, apply an appropriate amount of hydraulic oil to the moving parts to ensure smooth operation after assembly. When the pump is shut down for long-term storage, the hydraulic oil in the pump cavity should be drained to prevent the components from being corroded.
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