HITACHI ZX870LC-3 Track Roller Assembly(4473720)Heavy-duty crawle excavator undercarraige part/made by DPW TRACK-high quality spare part supplier.

Product Specifications

The track roller (bottom roller) assembly is a critical part of the undercarriage system in Hitachi ZX870, ZX850, and ZX890 hydraulic excavators. Its primary functions include:

• Supporting the machine’s weight and distributing load evenly across the track chain.

• Guiding the track chain smoothly along the undercarriage frame.

• Reducing friction between the track links and the undercarriage structure.

• Absorbing shocks from uneven terrain, enhancing stability and operator comfort.

Main Components of the Track Roller Assembly:

• Track Roller (Bottom Roller) – Supports the excavator’s weight and rolls along the track chain’s inner surface.

• Shaft & Bushing – Provides a rotating surface for the roller, reducing friction.

• Seals (Oil Seals & O-Rings) – Prevent dirt, debris, and moisture from entering the roller assembly while retaining lubrication.

• Bearings – Allow smooth rotation of the roller around the shaft.

• Retaining Bolts/Circlips – Secure the roller assembly in place.

2. Function:

• Distributes the machine’s weight evenly across the track chain.

• Reduces friction between the track links and undercarriage frame.

• Ensures smooth operation over rough terrain.

3. Common Signs of Wear:

• Uneven wear on the roller surface

• Excessive play or wobbling

• Oil leakage (indicating seal failure)

• Grinding or squeaking noises