Get a Quote

Sensors and Solenoid Valves: Identification and Ordering Discipline for Excavator Electrical Parts

A pressure switch and a pressure sensor can share one plug and opposite behaviours. How to identify sensors, solenoids and switches correctly โ€” because electrical parts are where near-miss orders get most expensive.

Sourcing Guide  ยท  September 27, 2026  ยท  Guangzhou, China

Sensors and Solenoid Valves: Identification and Ordering Discipline for Excavator Electrical Parts

Electrical parts are the smallest boxes on an excavator and the biggest source of wrong shipments in the trade. A pressure switch and a pressure sensor can share the same thread, the same plug and the same catalogue photo while doing opposite jobs; a solenoid for one machine generation may look identical to its successor and speak a different signal. That is why ordering sensors and solenoids by shape or by machine model alone fails so reliably โ€” and why the identification discipline for this category matters more than anywhere else. Corbay is the international export brand of Guangzhou Shenyue Machinery Technology Co., Ltd., Guangzhou, China. Sensors, solenoid valves, switches, throttle motors and controllers are quoted from Guangzhou daily across Kobelco, Komatsu, Hitachi, Doosan, Hyundai and other makes, and this guide is how we get electrical enquiries right.

Know Your Electrical Families โ€” What Each One Does

Pressure sensors and switches.Feed the controller the hydraulic system's state. Sensors send a continuous signal; switches send an on/off state โ€” the two are not interchangeable even when they screw into the same port.
Solenoid valves.Translate the controller's commands into hydraulic action โ€” shifting main-pilot flow, controlling travel speed, high-idle and boom priorities. Reference families such as the 40C50-213-type solenoid on our solenoid valve page are quoted daily, identified from the body number and the connector.
Throttle motors and rotary sensors.Position the engine throttle and report it back. Failure shows as hunting idle or no response โ€” and as a controller that cannot command what it cannot see.
Controllers and monitor panels.The machine's brain and face. These are the highest-value electrical lines and the ones where a near-miss number costs the most, which is why every controller and panel is quoted only against a verified nameplate.

Identification: What Actually Settles the Part

The hierarchy is strict in this category. First: the number on the part itself โ€” the moulded or stamped reference on the sensor body, the solenoid coil or the connector housing. Second: the machine parts documentation โ€” the maker's own references, structured per machine series in resources such as the machine makers' official documentation, which we cross-check against the number you send. Third: the photo evidence โ€” connector type and pin count, thread size, body shape and mounting, plus any colour code on the wiring. And underneath all of it, the machine model and data-plate serial number, because electrical specifications changed between production runs more often than mechanical ones did. Where a reference is commonly quoted rather than fully verified, we write "commonly referenced" and confirm before anything ships โ€” every quoted electrical line is either verified against the number you send or flagged honestly until it is.

Why Electrical Near-Misses Are So Expensive

They fail silently.A wrong-specification sensor fits perfectly and reports wrongly โ€” the machine runs degraded and the fault is hunted for weeks before anyone blames the new part.
Voltage and signal differences hide in the plug.Same connector, different output curve. This is why pin count and part number outrank photos, and why we confirm the signal type on quoted lines.
Controllers punish substitutes hardest.A borderline controller or throttle motor can take other components down with it โ€” the category where we verify the nameplate before quoting, every time.
Pack small, ship fast.The good news: sensors and solenoids are light and urgent-friendly. Air express moves them door to door in days, even on urgent lines.

What We Need to Quote Your Electrical Parts

Five things: the part number from the sensor or solenoid body โ€” or clear photos of the part, its connector and any label; the machine model and serial number; the symptom the machine is showing; the quantity; and the destination port. Send those to the team at Guangzhou Shenyue Machinery Technology Co., Ltd. through the contact page and the quotation normally comes back within 24 hours โ€” with genuine, OEM-quality and aftermarket grades stated on every line, and any unverified reference flagged as commonly referenced until confirmed. The wider electrical range sits in our electrical parts category.

Sensors and Solenoids โ€” FAQ

Do you supply electrical parts for brands other than Kobelco?Yes โ€” sensors, solenoids, switches, throttle motors and controllers are quoted across Komatsu, Hitachi, Doosan, Hyundai and other makes, identified from the body number and photo evidence rather than the machine badge.
Can you test or guarantee electrical parts?Every line ships with its grade and maker stated in writing, and claims are handled against that written grade โ€” what we will not do is pass an unverified reference as confirmed.
How do I request a quotation and how fast will I get a reply?Send the part number or photos, machine model and serial, symptoms, quantity and destination port via the contact page โ€” Guangzhou Shenyue Machinery Technology Co., Ltd. normally replies within 24 hours with every available grade on the line.

Send the Body Number, Not the Shape

Electrical parts forgive nothing: the wrong sensor fits, works and lies. Send the body numbers, the connector photos and the machine serials, and the team at Guangzhou Shenyue Machinery Technology Co., Ltd. will confirm what fits, quote every honest grade, and ship it fast enough to matter.

Corbay Excavator Parts is the international export brand of Shenyue Machinery (Guangzhou Shenyue Machinery Technology Co., Ltd.), Guangzhou, China. Shenyue is an independent parts specialist and is not affiliated with, or an authorized dealer of, Kobelco Limited. Parts are supplied as genuine, OEM or clearly identified aftermarket items, and the grade is stated on every quotation.