21T-54-36471 21T5436471 Cushion Excavator Spare Parts For KOMATSU PC2000

• 21T-54-36471 21T5436471 Cushion Excavator Spare Parts For KOMATSU PC2000

• Specification

• Function 

1. Stabilizing Swing Speed Under Load
When the excavator swings with a heavy load (e.g., a full bucket of soil or rock), changes in hydraulic pressure (caused by uneven terrain or load shifts) can cause the swing speed to fluctuate—leading to "jerky" operation and increasing the risk of material spillage.
This cushion acts as a hydraulic "damper" to absorb pressure fluctuations in the swing circuit. It maintains consistent oil flow to the swing motor, even under variable loads, ensuring steady swing speed and improving operational precision.

2. Protecting Hydraulic Components from Pressure Spikes
Sudden operator actions (e.g., slamming the swing control lever) or unexpected resistance (e.g., the swing structure hitting an obstacle) can create hydraulic pressure spikes—momentary surges in pressure that far exceed the safe operating limits of components like the swing motor, control valve, or hoses. These spikes can cause permanent damage (e.g., cracked valve bodies, leaking seals, or motor failure).
The 21T-54-36471 cushion includes a pressure relief feature that diverts excess pressure away from critical components during spikes. By limiting maximum pressure in the swing circuit, it prevents premature wear or failure of expensive hydraulic parts, extending the machine’s service life.

• Compatible models

EXCAVATORS PC2000

• More cushion 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