Excavator Parts K5V200DTP-OE11 9184686 Hitachi Hydraulic Main Pump
Assy for ZAX450 ZX450
Our main products are Excavator Hydraulic Spare Parts, Hydraulic
Main Pump, Swing Motor, Travel Motor, Final Drive Ass'y, Swing
Device Ass'y, Swing Gearbox, Travel Gearbox, Gears, Regulators,
Relief Valve, Fan Motor and other hydraulic items with genuine and
aftermarket quality. Until now, our products have been exported to
more than 198 countries and regions, spreading all over the Middle
East, Southeast Asia, Africa, North America, South America, Europe
and Oceania with our own brand "Belparts", which is highly praised
by foreign customers and enjoys a high reputation.
Spare Parts List
| # | Part No | Part Name | Qty. | Price Request |
|---|
| 9184686 | PUMP; PISTON | 1 | |
| 001 | 4469526 | . REGULATOR | 2 | |
| 995 | 4444902 | . SENSOR; ANGLE | 2 | |
| 996 | 4274371 | . O-RING | 2 | |
Modern excavators predominantly use swashplate-type axial piston
pumps. By electronically adjusting the swashplate angle via
proportional valves, the piston stroke and pump displacement are
precisely controlled. This enables instant response to operator
commands: reducing flow for energy savings under light loads, while
boosting pressure for heavy digging. Crucially, it balances power
and efficiency, minimizing heat generation and extending equipment
lifespan.
Engineered for extreme durability, these pumps feature hardened
alloy pistons and copper-plated rotors to withstand high-frequency
excavator shocks. Integrated pressure compensation and load-sensing
controls adapt to dynamic working conditions. Beyond power
transmission, they maintain stable pressure via closed-loop
feedback, enabling smooth coordination of lifting, slewing, and
digging--even in dusty or extreme-temperature environments.
Technical Specifications
The axial piston pump with a tilting swashplate is the undisputed
workhorse for primary hydraulic circuits in modern excavators. Its
core principle involves multiple pistons arranged axially (parallel
to the drive shaft) within a rotating cylinder block. Each piston
features a slipper pad riding on a non-rotating swashplate angled
relative to the drive shaft's axis.
As the cylinder block rotates, the pistons reciprocate within their
bores: moving outward during the half-rotation where the swashplate
distance increases (suction stroke, drawing fluid from the inlet
port), and being forced inward during the opposite half-rotation
where the distance decreases (discharge stroke, pressurizing fluid
to the outlet port).
The critical structural element for variable displacement is the
adjustable swashplate angle. By changing this angle (typically via
a hydraulic servo piston controlled by the operator or machine
electronics), the stroke length of the pistons is altered. A larger
angle increases piston stroke and thus pump displacement (flow
rate), while a zero angle results in zero displacement.
Key structural components include the drive shaft, rotating
cylinder block with precision piston bores, pistons with slippers,
swashplate with tilt mechanism, valve plate (stationary, with
kidney-shaped ports for inlet/outlet), and a robust housing.
In excavators, this design offers exceptional efficiency across a
wide operating range, precise flow control essential for
coordinated multi-function operation, and high-pressure
capabilities needed for digging forces. Its ability to instantly
vary flow from zero to maximum based on demand is fundamental to
efficient excavator power management.
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