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YM121850-49811 YM12185049811 121850-49811 Engine Thermostat For KOMATSU Excavator Parts

I appreciate the help from Paul, he's prefessional and knows exactly what parts I need. My CAT has gone back to work without any problem.

—— Raphael

Got the final drive and its beautiful I think. We've have it assembled in our Hitachi ZX330 excavator, my machines goes to work again now. Many thanks

—— Kevin

Fast shippment, the arrived parts is good quality, our engine is repaired and is perfectly running at maximum power. Thank you, god bless.

—— Mohammed

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YM121850-49811 YM12185049811 121850-49811 Engine Thermostat For KOMATSU Excavator Parts

YM121850-49811 YM12185049811 121850-49811 Engine Thermostat For KOMATSU Excavator Parts
YM121850-49811 YM12185049811 121850-49811 Engine Thermostat For KOMATSU Excavator Parts YM121850-49811 YM12185049811 121850-49811 Engine Thermostat For KOMATSU Excavator Parts

Large Image :  YM121850-49811 YM12185049811 121850-49811 Engine Thermostat For KOMATSU Excavator Parts

Product Details:
Place of Origin: China
Brand Name: OEM
Model Number: YM121850-49811
Payment & Shipping Terms:
Minimum Order Quantity: 1 PCS
Price: Negotiable
Packaging Details: Wooden box for heavy parts, paper carton for light parts
Delivery Time: 3-7 working days
Payment Terms: T/T, D/P, D/A,Western Union, L/C, MoneyGram
Supply Ability: 100-2000
Detailed Product Description
Model Number: 4D94 Product Name: Engine Thermostat 71 Degree
Part Number: YM121850-49811 YM12185049811 121850-49811 Packing: Standard Export Carton
Transportation: By Sea/air By Express Warranty: 6/12 Months
High Light:

121850-49811 Engine Thermostat


YM12185049811 Engine Thermostat


Excavator Engine Thermostat

  • YM121850-49811 YM12185049811 121850-49811 Thermostat Applied To KOMATSU Excavator Parts


  • Specification

ApplicationKOMATSU Engine spare parts
Parts NameThermostat
Parts No

YM121850-49811 YM12185049811 121850-49811

Delivery timeStock for urgent delivery
CondtionBrand new, OEM quality
Designmade in china
Means of transportBy sea/air, DHL FEDEX UPS TNT Express
PackingAs request or standard packing

A thermostat is a crucial component in an engine's cooling system, designed to regulate the engine's operating temperature. It does this by controlling the flow of coolant through the engine. Here's how a typical thermostat works:
Location and Housing: The thermostat is usually located at the engine's water inlet, which is where the coolant enters the engine. It is housed within a metal casing that is connected to the engine and the radiator.
Temperature-Sensitive Valve: Inside the thermostat housing, there is a temperature-sensitive valve. This valve is often referred to as the "wax element" because it contains a wax-like substance with a specific melting point. This wax element is connected to a shaft or piston.
Coolant Flow Regulation: The thermostat's primary function is to control the flow of coolant between the engine and the radiator. When the engine is cold and hasn't reached its optimal operating temperature, the wax element inside the thermostat is solid and contracts, causing the valve to stay closed. This prevents coolant from flowing to the radiator and allows the engine to warm up quickly.
Opening at Operating Temperature: As the engine heats up and reaches its optimal operating temperature, the wax element starts to melt. This expansion of the wax causes the valve to gradually open. Once the valve opens, coolant can flow from the engine to the radiator, where it releases heat and helps regulate the engine's temperature.
Temperature Regulation: The thermostat continuously adjusts the flow of coolant to maintain the engine at its ideal operating temperature. If the engine gets too hot, the thermostat opens wider to allow more coolant to flow and cool down the engine. Conversely, if the engine temperature drops, the thermostat starts to close to restrict the coolant flow and help the engine maintain its heat.
Komatsu engines, like those from other manufacturers, use thermostats tailored to the specific cooling requirements of their engines. The design and specifications of Komatsu thermostats can vary depending on factors such as engine model, size, and application.
YM121850-49811 YM12185049811 121850-49811 Engine Thermostat For KOMATSU Excavator Parts 0

  • We could supply the following spare parts

1 Hydraulic parts: hydraulic pump, main valve, hydraulic cylinder, final drive, travel motor, swing machinery, swing motor etc.
2 Engine parts: engine ass’y, piston, piston ring, cylinder block, cylinder head, crankshaft, turbocharger, fuel injection pump, starting motor and alternator etc.
3 Undercarriage part: Track roller, Carrier roller, Track Link, Track shoe, Sprocket, Idler and Idler cushion etc.
4 Cab parts: operator’s cab, wiring harness, monitor, controller, seat, door etc.
5 Cooling parts: Radiator, air conditioner, compressor, after cooler etc.
6 Other parts: Service kit, swing circle, engine hood, swing joint, fuel tank, filter, boom, arm, bucket etc.




  • Packing and Shipping

Packing Details :
inner packing : plastic film for wrapping
external packing : wooden
Shipping :
within 3 days after received the payment , by air or by express or by sea on the basis of the
quantity and emergency circumstances.
1. By Couriers: DHL, UPS, FEDEX, TNT are the main courier companies we are cooperated,

2. By Air: Delivery from the Guangzhou air port to customer's destination city air port.

3. By Sea: Delivery from the Huangpu port .

  • Product Warranty

1. Warranty Period: 3 Months' warranty from the date of arrival. Longer period of 6 months' warranty could be offered with higher price level.
2. Warranty type: replacement of the parts that have quality problem.
3. Warranty is not valid for below s
* Cutomer give wrong information about the order
* Force Majeure
* Wrong installation and operation
* Rust because of wrong stock & maintenance

  • Our service

1. Packaging is neutral packing or customized packing

2. We will reply you within 24 hours.

3. We will also provide you with good after-sales service.

4. OEM or ODM orders are welcomed.

5. Trial orders are acceptable

6. High quality and factory price.

7. 100% ensured the quality

Contact Details
Guangzhou Anto Machinery Parts Co.,Ltd.

Contact Person: Mr. Paul

Tel: 0086-15920526889

Fax: +86-20-89855265

Send your inquiry directly to us (0 / 3000)