Hitachi Excavator K5V200DTP-OE11 ZAX450 9184686 Hydraulic Main Pump
Repair
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.
List of Spare Parts
| # | Part No | Part Name | Qty. | Price Request |
|---|
| 9184686 | PUMP; PISTON | 1 | |
| 001 | 4469526 | . REGULATOR | 2 | |
| 011 | 0820401 | . PISTON ASS'Y | 2 | |
| 011A | | .. PISTON | 9 | |
| 011B | | .. SHOE | 9 | |
| 013 | 0820402 | . CYL. ASS'Y | 1 | |
| 013A | | .. BLOCK; CYL. | 1 | |
| 013B | | .. PLATE; VALVE | 1 | |
| 014 | 0451003 | . CYL. ASS'Y | 1 | |
| 014A | | .. BLOCK; CYL. | 1 | |
| 014B | | .. PLATE; VLAVE | 1 | |
| 030 | 0820403 | . PLATE ASS'Y | 1 | |
| 030A | | .. PLATE | 1 | |
| 030B | | .. BUSHING | 1 | |
| 030C | | .. LEVER | 1 | |
| 030D | | .. BOLT | 1 | |
| 030E | | .. PIN | 1 | |
| 030F | | .. PIN | 1 | |
| 031 | 0820404 | . PLATE ASS'Y | 1 | |
| 031A | | .. PLATE | 1 | |
| 031B | | .. BUSHING | 1 | |
| 031C | | .. LEVER | 1 | |
| 031D | | .. BOLT | 1 | |
| 031E | | .. PIN | 1 | |
| 031F | | .. PIN | 1 | |
| 111 | 0820405 | . SHAFT | 1 | |
| 113 | 0820406 | . SHAFT | 1 | |
| 123 | 0820407 | . BRG.; ROL. | 2 | |
| 124 | 0820408 | . BRG.; NEEDLE | 2 | |
| 126 | 0820409 | . SPACER | 2 | |
| 127 | 0820410 | . SPACER | 1 | |
| 128 | 0820411 | . SPACER | 3 | |
| 129 | 0820412 | . SPACER | 1 | |
| 130 | 0820413 | . BOOSTER | 1 | |
| 131 | 0820414 | . COVER | 1 | |
| 153 | 0820415 | . RETAINER | 2 | |
| 156 | 0820416 | . BUSHING | 2 | |
| 157 | 0451016 | . SPRING | 18 | |
| 171 | 0820417 | . CASING | 1 | |
| 191 | 0820418 | . GEAR; DRIVE | 1 | |
| 192 | 0820419 | . GEAR | 1 | |
| 211 | 0451018 | . PLATE | 2 | |
| 251 | 0820420 | . SUPPORT | 2 | |
| 261 | 0820421 | . COVER; SEAL | 1 | |
| 261 | 0820440 | . COVER; SEAL | 1 | |
The excavator hydraulic pump acts as the "heart" of the hydraulic
system, converting engine mechanical energy into hydraulic power to
drive actuators (e.g., cylinders, motors). Its core principle
relies on the reciprocating motion of pistons within cylinders,
cyclically altering chamber volume to suction and pressurize oil.
As a variable-displacement pump, it dynamically adjusts output flow
based on load demand, delivering stable high-pressure (35MPa+)
power for precise digging force while optimizing energy efficiency.
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.
A11V075 A11V095 A11V130 E374 Excavator Hydraulic Pump A11V190
