• 6745-21-3210 6745213210 Gear Cover KOMATSU Excavator Spare Parts Fit For PC300LC-8

• Specification

• Functions

1. Timing System Protection
The timing gear chamber (enclosed by this cover) houses critical components: crankshaft gear (drives power), camshaft gear (controls valve opening/closing), and idler gears (adjusts gear meshing). The cover prevents dust, gravel, or water from entering, avoiding gear wear or jamming (a common cause of valve timing deviation and engine misfires).

2. Oil Sealing & Lubrication Maintenance
The timing gears rely on engine oil for lubrication. The cover forms a closed cavity with the cylinder block, ensuring oil circulates within the gear chamber (instead of leaking to the engine exterior). It also works with the dedicated oil seal (6745-21-3230) to seal the gear shaft’s rotating interface, preventing oil loss and maintaining proper oil pressure.

3. Heat Dissipation & Noise Reduction
The cast aluminum/iron material has good thermal conductivity, helping dissipate heat generated by gear friction (preventing oil degradation from overheating). Additionally, the enclosed structure reduces mechanical noise from gear meshing, lowering overall engine operating noise.

• Compatible models

• More other cover parts fit for KOMATSU machine

• 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 .