NACHI PVD-2B-40P Excavator Pilot Gear Pump

specification parameter

Model subdivision: PVD-2B-40P (derivative models PVD-2B-40P-6G3/PVD-2B-40P-16G5)
Structural form: Internal meshing dual gear pump (one pilot control, one main pump oil replenishment)
Displacement: 40cc/rev
Rated working pressure: 2.5-3.5MPa on the pilot side; Oil replenishment side 21MPa, peak pressure resistance 31.5MPa
Adaptive speed: Standard working speed 1200-2400rpm, maximum allowable 2600rpm
Installation method: Standard PVD-2B main pump front flange direct connection, spline drive (9-tooth internal spline)
Oil port specifications: double-sided external threaded oil ports, separate oil inlet/outlet, compatible with the original vehicle oil pipe without modification
Applicable hydraulic oil: 46 #/68 # anti-wear hydraulic oil, oil temperature suitable for -20 ℃~80 ℃

Main material

Pump casing: High strength gray cast iron HT250, cast in one piece, earthquake resistant, high pressure deformation resistant, resistant to dust corrosion on construction sites, surface coated with anti rust red paint
Gear/Ring Gear: High carbon alloy structural steel, fully carburized and quenched, with a hardness of HRC58-62, wear-resistant and anti bite, and not easily worn or leaked during long-term high-pressure operation
Installation flange: 45 # precision milled steel plate, flat grinding treatment to ensure sealing with the main pump, flange positioning groove with accurate factory size exchange
Sealing components: FKM fluororubber oil seal+PTFE wear-resistant gasket, resistant to high temperature and hydraulic oil corrosion, to prevent oil leakage and seepage
Drive spline shaft: forged from chromium molybdenum alloy steel, resistant to bending and torsion, with no broken or sliding teeth during long-term start stop operation.

Core features of the product

1. Factory exchange, installation with zero modifications
The flange size, oil port position, and spline specifications are 1:1 compared to the original parts of BuYue. This NACHI PVD-2B-40P Excavator Pilot Gear Pump can be directly replaced on Yuchai 35, Komatsu 40, and Shanhe 50 models without the need to modify pipelines and brackets, with high maintenance and replacement efficiency.
2. Integrated design of dual fuel supply
The integrated dual structure simultaneously outputs pilot control oil and main pump replenishment oil, with one pump body achieving two hydraulic functions, simplifying the layout of hydraulic pipelines and reducing leakage points.
3. Low noise and low internal leakage
The internal meshing gear structure runs smoothly, with a load noise of ≤ 72dB; the precision grinding gear fits with a clearance of ≥ 91%, and there is no significant problem of slow movement or heavy handle after 3000 hours of use.
4. Strong durability under harsh working conditions
The cast iron shell is resistant to impact and vibration, and the alloy gear is wear-resistant, suitable for continuous heavy load operations on earthwork, crushing, and muddy construction sites; Stable pressure output in high and low temperature environments, without pump jamming or suction phenomena.
5. Stable pressure output
The constant output of pilot oil pressure ensures smooth and seamless operation of the excavator handle, rotation, and walking without any jamming; Adequate oil replenishment pressure protects the main plunger pump from cavitation and extends the service life of the main hydraulic pump.
6. Low maintenance costs
The structure is simple without precision valve core, and the faults are only concentrated in oil seal and gear wear; Strong universality of accessories, convenient maintenance and disassembly, significantly reducing maintenance costs compared to replacing the entire main pump

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