คำอธิบาย
Komatsu’s parts catalogue gives this item the name Pump Assembly and files it under hydraulics, so the type is manufacturer-confirmed. What the catalogue does not tell us, and what no trade source settles either, is which circuit the unit serves on the GD705-5. We publish that gap rather than filling it with a guess.
适用性与证据
Komatsu GD705-5 wheel scraper, listed in trade parts data under the 708-1U pump group. Within Komatsu’s 708 numbering the 1x series carries pumps and the 7x series motors, an observation that held across every Komatsu-published item name we checked, but it is a pattern rather than a documented rule and we present it that way. No displacement, pressure or flow figure is published for this number, so none appears on this page.
Why a wheel scraper is a hard duty for any hydraulic pump
A scraper works in loose material, carries a loaded bowl, and cycles its ejector and bowl doors under pressure while the machine is moving. Three things follow that shorten pump life:
- Dust ingress. Fine material gets into the hydraulic tank through breathers and cylinder rod wipers faster than on most machines, and the pump is what pays for it.
- Sustained heat. The bowl and ejector circuits run at high pressure through the loading cycle, so oil temperature stays elevated for hours.
- Contamination in the return path. A worn ejector cylinder feeds metal straight back into the circuit that feeds the pump.
So the test order on a GD705-5 is: sample the oil and inspect the return filter element first, because a pump replaced into contaminated oil is a warranty claim waiting to happen. Then measure pressure and flow at working temperature, then check relief and pilot settings, and only then condemn the pump. Our 密封套件翻新检查清单 covers what a proper hydraulic repair includes and 驱动齿轮检查 covers the input side.
How we quote it
Send three things: a photograph of the number cast on your pump, the machine model and serial prefix, and a note of the circuit you believe is at fault. We match those against the parts catalogue for your build. If the evidence points to a different item, we say so before invoicing rather than after the unit arrives on the bench.
装配与订购
Match shaft spline, pilot diameter, flange, port positions and control orientation against the removed pump. Prime the casing with clean oil before cranking, change the return filter element, clear the suction strainer, keep the case drain unrestricted to tank, and target ISO 4406 18/16/13. Minimum order one piece. Three to six month warranty on new aftermarket units as stated on your proforma invoice; bench checked and photographed against your order before the wooden case closes, delivery 5 to 8 working days from payment subject to stock. The WA380-6 main pump is 708-1W-00882; ；该系列归入 小松液压泵.
