21W-03-41220 21W0341220 21W-03-41210 Hose Excavator Spare Parts For KOMATSU PC78MR PC78US

• 21W-03-41220 21W0341220 21W-03-41210 Hose Excavator Spare Parts For KOMATSU PC78MR PC78US

• Specification

• Function 

1.Hydraulic Power Transmission
It efficiently delivers high-pressure hydraulic oil (generated by the hydraulic pump) to actuators (e.g., boom cylinders, swing motors). This oil pressure is converted into mechanical force, enabling the excavator to perform core operations such as digging, lifting, swinging, and bucket tilting. Without this hose, hydraulic power cannot reach the working parts, and the machine would be inoperable.

2.Withstand High Pressure & Wear Resistance
The hose is constructed with multiple layers of steel braiding and a durable rubber outer layer. This design allows it to withstand the high operating pressure of the hydraulic system (typically up to several hundred bar, depending on the specific excavator model) and resist abrasion from contact with external debris, rocks, or machine parts during operation—preventing premature cracking or rupture.

3.Oil & Temperature Resistance
Its inner rubber layer is formulated to be compatible with common hydraulic oils (e.g., mineral-based hydraulic fluids), avoiding chemical degradation (such as swelling or hardening) that could block oil flow or cause leaks. It also operates stably across a wide temperature range (usually -40°C to +120°C), adapting to harsh working environments like cold winters or high-temperature construction sites.

• Compatible models

EXCAVATORS PC78MR PC78US PC78UU

• More hose parts fit for KOMATSU machinery

• Catalog parts list

• 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.

• Advantage

1. Offer Top quality & competitive products

2. Support 12-month warranty

3. 100% tested before shipping

4. Delivery in time

5. A wide range of Oil Pressure Sensor, Fuel Tank Level Sensor, Temperature Sensor, Speed Sensor for excavator 

6. More than 15 years production and 11 years foreign trade experience

7. Professional QC team

8. Best sales team, 24 hours service

• 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