คำอธิบาย
Some part numbers arrive with two conflicting descriptions, and the honest answer is that we do not know which is right. This page carries that answer rather than picking the more marketable one, because the difference decides what the part is for and a buyer deserves to know before ordering.
The conflict, stated plainly
- Our source record grouped 14602252 with the fan drive pumps for the EC380 and EC480.
- Chinese dealer listings describe the same number as a pilot pump for the EC340D, EC380D and EC480D.
- Volvo’s own online parts catalogue does not return a citable page for the number, so neither claim can be confirmed from the manufacturer.
A fan drive pump and a pilot pump are not interchangeable parts. One supplies oil to the cooling fan motor; the other supplies the low-pressure control circuit that actuates the main pumps’ regulator. Fitting the wrong understanding of this part into a diagnosis is how a workshop spends a day and still has a hot machine or a sluggish one.
How to confirm which circuit yours serves
- Photograph the port block. A pilot pump is small with two ports and a drain; a fan pump is larger and usually has a control or orifice block on the body.
- Trace the hoses. Follow the delivery line: to the fan motor at the radiator, or to the pilot manifold near the main pumps.
- Read the number cast on your housing including any suffix, and note the machine serial prefix.
- Send all three to us. We will confirm against the parts record for your build and tell you which circuit this item serves on your machine before you pay.
Diagnosis notes for both possibilities
If it is a pilot pump, the symptoms are sluggish or unresponsive controls with normal engine power, and the test is pilot pressure at the regulator port. Our 调节器诊断与调整指南 covers that measurement. If it is a fan drive pump, the symptom is heat with normal digging performance, and the test is fan speed and pump outlet flow, covered in our 液压风扇泵诊断指南. Both circuits are contaminated by the same root causes, so a filter change and an oil sample belong in either repair, as set out in 密封套件翻新检查清单.
安装
Match shaft form, pilot, flange, port positions and rotation against the removed pump. Prime 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.
订购
Minimum order one piece. Three to six month warranty on new aftermarket units as stated on your proforma invoice; photographed against your order before the wooden case closes, delivery 5 to 8 working days from payment subject to stock. Confirmed Volvo fan drive pumps and motors are listed under Volvo hydraulic fan motor, and this item sits under ปั๊มไฮดรอลิกสำหรับรถขุด until the circuit is confirmed.
