Descrição
A remanufactured pump occupies an awkward position in a parts catalogue. It is neither new nor used, buyers often assume it is one or the other, and the difference in real terms is large enough to be worth spelling out. This page covers the YA00006715 fan pump as we actually supply it, and what the word remanufactured has to cover for the part to be worth buying.
What the plate on this unit tells you
The photographs on this listing are of the assembly we work from. The Hitachi nameplate reads YA00006715, works number 18315641, Hitachi Construction Machinery Co., Ltd, Made in Japan. The housing carries cast markings including 63F e um K6V63 size designation, and the control solenoid with its sticker is present as fitted at the factory.
Those castings settle a question that the trade leaves open. Supplier listings for YA00006715 describe it variously as a gear pump and as a piston pump, and some attach it to ZX470-3 while others attach it to the 670 and 690 class. The physical unit shown here is an axial piston pump of the 63 cm3 size class with an electrically controlled regulator, which is consistent with how Hitachi drove the cooling fan on these machines. If your old pump is an aluminium gear unit, this is not the part you need and we would rather say so now than after it arrives.
What remanufactured has to mean
The term is used loosely across our industry, so here is the benchmark we work against. Caterpillar, whose Reman programme covers hydraulic pumps and motors among other units, publishes the process: the core is disassembled to its smallest piece parts, cleaned, inspected, with salvage by machining or laser deposition where the housing or shaft allows it, then reassembled to original specification incorporating current engineering updates, and tested to the same standards as a new part before being released with a same-as-new warranty. Cat also publishes that Reman parts typically price at 45 to 85 percent of new against a returned core.
That is a demanding definition, and it is the right one, because a pump that has only had seals replaced will still have scored bores and worn slipper faces, and it will fail in the same way the original did. Our remanufactured fan pumps are built to that scope:
| Estágio | Included on this unit | Notas |
|---|---|---|
| Strip and clean | Yes, to component level | Housing and cover sand-blasted where the casting allows |
| Inspeção | Yes, bore, slipper, shaft, seal surfaces | Units beyond salvage are scrapped, not sold |
| Wear parts | Replaced | Seals, bearings, fasteners as required by the build |
| Salvage | Where permissible | Machining of shaft journals and sealing surfaces |
| Teste | Yes, delivery pressure and rotation | Photographed after test, before packing |
| Original plate | Retained | So you can verify part number and origin yourself |
Why the fan pump is worth taking seriously on a 47 to 69 tonne machine
Hitachi’s factory specification for the successor ZX470LC-6 describes a cool-on-demand, hydraulic-driven, suction-type fan with remote-mounted drive, plus a hydraulic fan reverser as standard equipment. On the larger ZX870-5G the manufacturer states that the system optimises the speed of two cooling fans according to coolant and hydraulic oil temperature, for cooling capacity and noise reduction. In both cases the fan pump is the actuator of that strategy. When it cannot reach full displacement, the fan cannot reach full speed, and the operator sees a temperature gauge that drifts upward under load while swing, travel and digging all feel normal.
That last point is the diagnostic trap. A machine with a tired fan pump is usually blamed on the fan motor, the radiator or the coolant sensor first. Run the flow and pressure tests in our guia de diagnóstico de bomba hidráulica do ventilador before ordering, and check the control signal with the regulator diagnosis and adjustment article. If the machine has lost a pump before, read the transfer case failure guide, because a worn drive train starves a good pump and the failure then looks like a bad part.
Fitting a remanufactured pump
- Compare the old pump side by side with the photographs on this page: shaft form, flange face, port positions and the orientation of the solenoid.
- Change the return filter element and clear the suction strainer. Cleanliness for this class of unit is quoted at NAS 1638 class 9, which is ISO 4406 18/15, with a 10 micron return filter.
- Fill the casing with clean oil before cranking, and keep the case drain unrestricted within 0.1 MPa normal and 0.4 MPa peak.
- Bleed the circuit with the fan restrained, confirm rotation direction, then prove full fan speed under thermal load before the guard goes back.
- Log coolant and hydraulic oil temperatures at low and high idle after the job.
Pedido
Minimum order one piece. Each unit is photographed after test against your order before the wooden case closes, and we hold the shipment until you confirm the photographs. Delivery 5 to 8 working days from payment subject to stock, by sea or air for volume and by DHL, FedEx, TNT or EMS for single units. Remanufactured stock is sold on core exchange terms where a core is requested, and the warranty period for this grade is stated on your proforma invoice; ask for it in writing before you order. Related items: the fan motor for the same machine is on our YA00005829 KYB fan motor page, the pump that drives the main circuits is covered under bomba hidráulica para escavadeiras, and the rest of the fan drive range sits under motor do ventilador hidráulico.
