Excavator Hydraulic Pump Part Number Guide: How to Identify the Correct Replacement
A buyer sends a photo and one short code: K3V280DTH. He wants a price for a replacement pump. The code looks specific, but it does not identify one complete pump.
Amoparts lists a K3V280DTH pump for a SANY SY750 under the full code K3V280DTH-1GZR-0E92. Another K3V280DTH pump for a Volvo EC700 uses K3V280DTH-1CER-9N0Y-AVB. The shared family name does not make these pumps interchangeable.
To identify the correct replacement, send four things together: the full pump nameplate code, the machine OEM pump number, the excavator serial number, and clear photos of the installed pump. This article shows how those details work together and what to do when one of them is missing.
If the pump has not passed a proper failure test, stop before ordering. Use the excavator hydraulic pump testing guide to rule out a relief valve, inlet, control, cylinder, or motor problem first.
How to Identify Excavator Hydraulic Pump Part Number?
The old pump may show several numbers, and more than one can be correct. The mistake is assuming that every number identifies the complete assembly.
The machine OEM pump number comes from the excavator manufacturer’s parts system. It may appear on a parts page, service invoice, dealer quote, or label. Use the machine serial number when looking it up because one excavator model can use different pumps across production ranges.
The pump manufacturer type code appears on the pump nameplate. Kawasaki, Bosch Rexroth, KYB, Nachi, and other pump makers use this code to describe the pump they built. The complete code can include the series, nominal displacement, pump arrangement, design version, rotation, regulator, and control options.
The pump serial number belongs to one manufactured unit. It can support production tracing or service research, but it is not a replacement model by itself.
A casting or housing number often identifies only the part carrying that mark. It may belong to a casing, regulator body, valve block, or cover. Treat it as evidence, not as approval to order a complete pump.
Write the label beside every number in your notes. “P/N 400914-00088A” means more than an unlabeled string of digits in a message.
Start With a Real Matching Hydraulic Pump Problem
Consider the two K3V280DTH listings mentioned above:
- SANY SY750 hydraulic pump: machine OEM number
60295799; pump codeK3V280DTH-1GZR-0E92. - Volvo EC700 hydraulic pump: machine OEM numbers
14656476and14522561; pump codeK3V280DTH-1CER-9N0Y-AVB.
Both pumps belong to the same broad K3V280DTH family. The full codes and machine references are different. A supplier must check the complete configuration instead of quoting from K3V280DTH alone.
The suffix can separate regulator and control arrangements that affect how the excavator commands pump flow and power. It can also separate design versions and other build options. Even when two pumps bolt to a similar location, their controls, ports, or attached pumps may not match.
Read a Kawasaki Hydraulic Pump K3V or K5V Code From Left to Right
Kawasaki’s K3V and K5V catalog separates the ordering code into defined fields. The fields cover the pump series, displacement, single or double construction, optional equipment, design code, rotation, regulator design, and control type.
Take K3V112DT as a starting point. K3V identifies the series, 112 identifies the nominal displacement size, and DT identifies the double or tandem construction. Those characters still do not describe every regulator and control option.
That is why the longer code matters. A Doosan DX255LC main pump can be referenced by OEM number 400914-00088A and pump code K3V112DTP1FQR-9NM9-V. Searching only for K3V112 removes most of the information needed to check the assembly.
Copy the code as one continuous record. Keep every dash, slash, zero, and suffix letter. If glare hides one character, write a question mark and send the original photo instead of choosing the character that looks most likely.
Do not decode an unfamiliar suffix from a chart for another series. Read the correct catalog for that pump family and revision. Manufacturers can use similar characters in different positions for different meanings.
Use the OEM Number and Hydraulic Pump Code Together
The OEM number and pump type code solve different parts of the identification job. The OEM number connects the request to the machine maker’s parts catalog. The pump code connects it to the pump manufacturer’s build.
The Doosan example shows why both matter:
- Machine: Doosan DX255LC series
- Machine OEM pump number:
400914-00088A - Pump manufacturer code:
K3V112DTP1FQR-9NM9-V
A buyer may find the product with either number. A parts specialist should still check the other number, the excavator serial, and the nameplate before confirming fitment.
OEM numbers can also be superseded. A newer number may replace an older number only for a stated serial range or with related changes. Ask whether the replacement requires a different coupling, hose, bracket, controller, or installation instruction.
Why a Short Rexroth Family Name Is Not an Order Number
A short name such as A8VO160 helps identify a pump family and nominal size. It does not preserve the shaft, mounting, rotation, controls, ports, or complete design version.
One Amoparts Caterpillar 345BL listing pairs OEM references 123-1993 and 200-3550 with the longer code A8VO160LA1KH1/60R1-NSG05F00. The characters after A8VO160 are part of the identification record, not optional search text.
Bosch Rexroth operating instructions also show several separate fields on a typical axial piston unit nameplate. These can include the type code, material number, serial number, customer material number, manufacturing date, rotation, displacement, and optional settings.
Photograph the entire plate so the field labels remain visible. A material number and customer number can look similar when someone crops the photo down to digits only.
Do not build a full Rexroth code from memory. Copy it from the installed unit, then check the correct data sheet and machine application. One changed character can describe a different configuration.
When the Hydraulic Pump Nameplate Is Missing
A missing plate makes the job slower, but it does not justify guessing. Start at the machine and work toward the pump.
First, photograph the excavator identification plate. Record the make, full model, complete serial number or PIN, and market version if known. Do not send the engine serial number as a substitute for the machine serial number.
Next, use the serial number in the correct machine parts catalog. Record the main hydraulic pump assembly number, any older number, and any superseding number. Save the catalog diagram or item description with the record.
Then inspect the pump for a second tag, engraved order number, or stamped code on a machined surface. Look near the mounting flange, regulator, rear housing, and attached pilot or gear pump. Clean with a safe method and do not grind a thin plate or machined surface.
Finally, compare the installed assembly with the catalog result. Check the number of pump sections, shaft, flange, regulator, solenoids, sensors, connectors, and attached pumps. Any difference needs an answer before the supplier ships the replacement.
Build a Photo to Check Hydraulic Pump Specialist
One close photo of a dirty plate is rarely enough. Take the pictures in a fixed order so the supplier can follow the pump from the machine to the small details.
- Machine identification plate with the complete serial number
- Full pump in its installed position before any hose is removed
- Straight nameplate photo, plus two angled photos to control glare
- Shaft end, mounting flange, and coupling area
- Main inlet and outlet ports
- Pilot, signal, and case-drain ports
- Regulator, linkage, pilot lines, and adjustment covers
- Solenoids, sensors, connectors, and wire colors
- Rear section, pilot pump, or attached gear pump
- Every stamped, engraved, or cast number
Do not remove hoses before taking the installed views. Marking each hose helps with installation, but hose position alone does not prove port function. A previous repair may have rerouted a line.
Measurements can expose an obvious mismatch when no verified drawing exists. Record the flange pilot, bolt pattern, shaft diameter and spline count, and major port sizes only after the pump is safe to handle.
Turn the Evidence Into One Quote Request
Keep the entire identification record in one email or form submission. A pump code in one message and the machine serial in another invites mix-ups.
Use this format:
Machine: Doosan DX255LC-5
Machine serial number: [copy the complete PIN]
Machine OEM pump number: 400914-00088A
Pump nameplate code: K3V112DTP1FQR-9NM9-V
Pump serial or material number: [copy from plate]
Required condition: new OEM, remanufactured, or new aftermarket
Required scope: complete pump with regulator, solenoids, and attached pilot pump—supplier to confirm
Delivery: [city, postal code, country, and required date]
Attachments: machine plate, pump plate, installed views, ports, shaft, controls, and attached pumps
Ask the supplier to repeat the exact OEM number and full pump code on the quote. The quote should also state which controls and attached parts are included. “Complete pump” means little unless the listed scope defines it.
If a character or cross-reference remains uncertain, say so. A supplier can request one more photo before payment. That delay costs less than returning a heavy pump with the wrong regulator or port layout.
Check the Hydraulic Pump When Ship
Before payment, compare the quoted code with the original record character by character. Do not accept a shortened family name in place of the code you supplied.
Ask for a photo of the actual unit or a verified configuration drawing. Compare the shaft, flange, port positions, pump sections, regulator, connectors, sensors, and attached pumps. Confirm the stated rotation from the proper drive-end reference.
Also confirm condition and scope. A new OEM pump, new aftermarket pump, remanufactured pump, bare pump, and tested used pump are different products. The quote and warranty should use the correct term.
Read the warranty exclusions before installation. Hydraulic pump warranties often depend on clean oil, correct flushing, new filters, proper case filling, and removal of the original failure cause. Keep the commissioning and cleanliness records.
Conclusion
An excavator hydraulic pump part number is a set of connected identifiers, not one convenient search term. Match the full pump code with the machine OEM number and excavator serial number. Use the nameplate, machine record, and physical configuration to make those numbers agree.
Do not order from a short family code, casting mark, or excavator model alone. Review the Amoparts hydraulic pump category after you build the identification record. If the suffix or OEM cross-reference remains uncertain, send Amoparts a quote request with the complete photo set.
