Product Video
Products Description
|
Brand |
Product Name |
Model |
Part Number |
|
Hitachi |
Carrier Roller | EX1800 | 4349519 |
Product Details
|
Product Name |
Carrier Roller |
|
Part Number |
4349519 |
|
Origin |
Japan |
|
Brand Name |
Hitachi |
|
Model |
EX1800 |
|
Price |
Negotiable |
|
Packing Details |
Standard Export Packing |
|
Delivery Time |
0-30 Days |
|
Payment Term |
L/C, T/T |
|
Price Term |
FOB, CIF, CFR |
|
Supply Capacity |
50,000 PCS/Month |
|
Minimum Order Quantity |
1 PC |
|
Material |
Resin-impregnated filter paper |
|
Technology |
Precision Machining |
|
Quality |
Original Factory Standard |
|
After-Sales Service |
Full Support, Online Service |
|
Color |
Customizable |
|
Application |
Excavator |
|
Customizable |
including customized materials, surface treatment and specifications |
Filtration Performance Parameters
Radial Runout (Tread): ≤ 0.08 mm
Surface Roughness (Tread): Ra 1.6 µm
Hardened Layer Inspection: Eddy Current (Non-Destructive)
Flange Root Radius: 6 mm)
Balance Quality Grade: G16 (ISO 1940)
Salt Spray Test Duration:72 hours (no red rust)
Face Runout (Flange):≤ 0.10 mm
Product advantages
Roller shell surface hardness consistency across the entire circumference
The roller shell is heat-treated to maintain surface hardness within ±2 HRC around the full circumference. This prevents localized soft spots that would cause uneven wear on the tread, ensuring the roller maintains its original profile throughout its service life.
Sealing system prevents grease contamination from external debris
The floating seal design blocks external contaminants such as sand, water, and fine dust from entering the bearing area. Clean grease maintains proper lubrication between the shaft and bushing, reducing friction-related heat generation and preventing premature bearing seizure.
Bracket design with reinforced gussets for structural rigidity
The mounting bracket features reinforced gusset plates at high-stress corners to prevent flexing under heavy chain loads. This rigidity keeps the roller shaft perpendicular to the track frame, ensuring the tread makes full contact with the chain links and preventing uneven wear patterns.
Shell thickness uniformity for balanced thermal expansion
The track carrier roller carrier roller shell maintains wall thickness within ±0.3 mm across the entire circumference. This uniformity ensures that heat generated during operation dissipates evenly and thermal expansion occurs symmetrically, preventing out-of-round deformation that would cause seal lip distortion and grease leakage.
Working Performance & Value
Inspect grease nipple condition before each lubrication session
Before connecting the grease gun, clean the nipple tip and check for blockage or damage. A clogged or damaged nipple prevents grease from reaching the bearing. Replace any nipple that shows signs of cracking or stripped threads. Always keep a spare nipple on hand for quick replacement.
Lubricate new roller after initial break-in period
For Hitachi track carrier roller assemblies, apply fresh grease after the first 50 hours of operation. This flushes out any manufacturing residue and ensures the bearing receives clean lubrication from the start. Subsequent lubrication intervals follow the standard 250-hour schedule for normal operating conditions.
Check roller axial play with track chain removed
When the track chain is removed for undercarriage service, grasp the roller and attempt to move it along its shaft axis. Any noticeable axial movement indicates excessive wear on the bearing thrust surfaces. Replace the roller if axial play exceeds 0.5 mm, as this condition will cause seal distortion.
Daily Maintenance Recommendations
Persistent oil film on the roller shell surface – seal ring leakage
If a continuous oil film appears on the outer surface of the roller shell, the floating seal ring has lost its sealing ability. This allows lubricant to escape and contaminants to enter. The roller must be disassembled and the seal ring replaced immediately. Do not operate until the repair is completed.
Roller rotation feels rough when turned by hand – bearing damage
For Hitachi track carrier roller assemblies, manually rotate the roller after lifting the track. If the rotation feels rough or produces a grinding sensation, the internal bearings have sustained damage. Disassemble and replace the bearing set. Do not reinstall the roller without bearing replacement.
Black discoloration around the seal groove – rubber degradation
Black residue or discoloration around the seal groove indicates the rubber seal material is degrading. This often results from extended exposure to high ambient temperatures or contact with incompatible cleaning solvents. Clean the area and replace the seal with a fresh one rated for high-temperature service.
Metallic debris found near the roller after operation – internal wear
After a work shift, inspect the area beneath the roller for small metal chips or particles. Metallic debris indicates excessive internal wear between the shaft and bushing or within the bearing assembly. Immediate disassembly is required to identify the source and replace worn components.
STONE
Stone is a leading supplier of engineering machinery parts, focusing on providing high-quality parts for mining companies. Since its establishment in 2004, we have been based in Shanghai, China, and have built our own brand STONE, becoming a trusted choice in the industry. We are committed to providing a variety of parts including bulldozers, excavators and wheel loaders for well-known brands such as Caterpillar and Komatsu. Our product line covers a full range of OEM parts, such as Track Chain, Track Rollers, Sprocket, Excavator Buckets, Blades, Excavator Cylinders, Swing Circles, and various electrical and hydraulic components to ensure that our customers' stringent requirements for quality and performance are met.
quality
years experience
service
hours warrant
Q＆A
What should be checked if the carrier roller shows no visible wear butproduces intermittent noise?
Intermittent noise from the carrier roller without visible wear typically indicates a dry
bearing or a stuck grease nipple. Grease may not reach the bearing if the nipple isblocked. Clean or replace the nipple and apply fresh grease. If noise continues,
inspect the bearing cage for damage.
How to handle bracket bolt holes that have become enlarged from
vibration?
If the bracket bolt holes are enlarged or elongated due to prolonged vibration, the
roller will not maintain correct alignment. Standard torque will not hold the roller inplace. Use a repair insert or replace the bracket. Do not weld the bolt holes, as heat can warp the bracket and cause further misalignment.
How does bushing wear in the carrier roller affect track pitch and
tension?
creates drag on the return side of the chain, causing uneven pitch wear between the upper andlower chain runs. This condition makes consistent track tension adjustment difficult and
accelerates sprocket and idler wear.
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