Product Video
Products Description
|
Brand |
Product Name |
Model |
Part Number |
|
Hitachi |
Front IdIer |
EX1800 |
9064302 |
Product Details
|
Product Name |
Front IdIer |
|
Part Number |
9064302 |
|
Origin |
Japan |
|
Brand Name |
Hitachi |
|
Model |
EX1800 |
|
Price |
Negotiable |
|
Packing Details |
Standard Export Packing |
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Delivery Time |
0-30 Days |
|
Payment Term |
L/C, T/T |
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Price Term |
FOB, CIF, CFR |
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Supply Capacity |
50,000 PCS/Month |
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Minimum Order Quantity |
1 PC |
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Material |
High Quality Steel |
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Technology |
Precision Machining |
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Quality |
Original Factory Standard |
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After-Sales Service |
Full Support, Online Service |
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Color |
Customizable |
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Application |
Excavator |
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Customizable |
including customized materials, surface treatment and specifications |
Product Features
Technical Specifications
Height (mm):380
Width (mm): 1050
Length (mm): 1080
Tread Diameter (mm):1050
Overall Flange Width (mm):1100
Shaft Diameter (mm):160
Total Idler Width (mm):634
Material:Forged Alloy Steel
Seal Type: Floating Seal (Lifetime Lubrication)
Deep flange groove for positive track guidance
The idler features a deep, precision-machined groove between its flanges. This groove captures the track chain links and maintains the chain's lateral position as it enters the front of the undercarriage. This positive guidance prevents the chain from derailing during sharp turns or when operating on uneven ground, ensuring the track stays aligned with the sprocket and rollers.
Reinforced web and hub for front-end impact absorption
Located at the front of the undercarriage, the idler is the first point of contact with rocks, stumps, and obstacles. The web and hub are cast with extra thickness and reinforced ribbing to absorb these high-impact loads without cracking or deforming. This structural design ensures the idler maintains its shape and alignment even under repeated heavy impacts.
Integrated interface for track tensioning adjustment
The idler hub of the 9064302 Hitachi EX1800 Track Front Idler is machined with a precise mounting interface that connects directly to the track tensioning cylinder. This allows the tensioning mechanism to push the idler forward and backward smoothly, maintaining the correct track sag as the chain elongates. The robust connection ensures consistent tension control without binding or excessive play.
Sealed bearing system to block mud and water ingress
Operating in the dirtiest part of the machine, the idler uses a heavy-duty bearing assembly paired with a floating seal. This sealing system blocks abrasive mud, water, and fine grit from entering the bearing chamber. By keeping the lubricant clean, it reduces friction and prevents premature bearing failure, extending the service life of the front idler.
Application Value
Maintains Track Tension Stability for Reduced Power Loss
As the front idler wears, the track tension fluctuates beyond the designed range. A worn idler tread causes the chain to ride unevenly, requiring the machine to expend additional hydraulic power to maintain travel speed. This directly increases fuel consumption. By replacing the front idler at the correct wear limit, the track tension remains within the optimal range. The travel motor operates at its designed efficiency, reducing energy waste and lowering daily fuel costs.
Prevents Cascading Failure and Protects High-Value Undercarriage Components
A failing 9064302 Hitachi EX1800 Track Front Idler is not just a single part issue. Once the idler bearing seizes or the tread wears too deep, the track chain loses its front guide. This causes the chain to jump off, which can damage the sprocket teeth, bend the track frame, and destroy the chain links. The cost of replacing a front idler is minor compared to the cost of repairing a bent track frame or replacing a complete track chain. Proactive replacement of the EX1800 front idler acts as an insurance policy against catastrophic and expensive undercarriage downtime.
Absorbs Front-End Impact for Continuous Operation in Harsh Conditions
The front idler is the first component to strike rocks, debris, and uneven ground. When the machine pushes through harsh terrain, the idler absorbs heavy impact loads. A structurally weak idler will crack or deform, leading to unexpected machine downtime right in the middle of a project. The reinforced hub and web of this EX1800 front idler are designed to absorb repeated high-impact loads. By maintaining structural integrity, it ensures the machine keeps working through the toughest conditions, maximizing daily production and avoiding schedule delays.
Maintenance Recommendations
Inspect Guide Track Surface and Sliding Block Wear
The front idler must slide freely along the track frame to maintain proper chain tension. During routine inspection, clean the guide track surface and check the sliding blocks for wear or scoring. Accumulated mud and debris can jam the sliding mechanism, preventing the tensioning cylinder from moving the idler smoothly. Worn sliding blocks allow the idler to tilt, causing uneven tread wear and chain misalignment.
Check Tread Surface for Uneven Wear and Impact Damage
The tread of the 9064302 Hitachi EX1800 Track Front Idler bears the full load of the front track chain and is vulnerable to rock impacts. Examine the tread surface for flat spots, deep grooves, or irregular wear patterns. Uneven tread wear changes the effective rolling radius, causing the chain to ride higher on one side and leading to track jumping or uneven pitch. Any deep impact cracks on the flange edges require immediate replacement to prevent sudden structural failure.
Verify Floating Seal Integrity to Prevent Bearing Seizure
Operating in the dirtiest position on the machine, the front idler relies on a floating seal to keep abrasive mud and water out of the bearing chamber. Before each shift, check for grease leakage around the seal area. If the seal fails, lubricant escapes and contaminants enter, causing bearing seizure within a short period. When checking axial play or replacing the idler, always install new sealing rings and O-rings to ensure a reliable barrier.
Check Idler Mounting Bolts and Tensioning Cylinder Connections
The front idler is held in position by mounting bolts and connected to the track tensioning cylinder through a linkage. After each track tension adjustment or every 250 operating hours, verify that all mounting bolts are tightened to the specified torque and that the tensioning cylinder pin is securely seated. Loose bolts allow the idler to shift under load, causing misalignment with the track chain and uneven tread wear. A worn or disconnected cylinder pin prevents proper tensioning, leading to track sag or excessive tightness.
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 are the specified tread diameter limits for the EX1800 front idler 9064302?
For 9064302 Hitachi EX1800 Track Front Idler, new tread diameter is 850 mm. The minimum allowable diameter before replacement is 830 mm. The maximum permitted diameter difference between left and right idlers is 3 mm. If the left idler measures 832 mm and the right measures 828 mm, the 4 mm difference exceeds the limit and both should be replaced as a pair. Use a Pi tape or caliper at the tread centerline, and measure at three points 120 degrees apart to check for ovality.
What is the correct axial clearance for the EX1800 idler shaft and bushing?
New assembly axial clearance is 0.10–0.25 mm. Maximum allowable clearance before replacement is 0.50 mm. Measure with a dial indicator against the idler hub face, applying hand force to push the idler back and forth along the shaft axis. If the reading exceeds 0.50 mm, the thrust washer or bushing is worn and the assembly must be replaced. Do not add shims to reduce clearance in a sealed assembly.
How many shims are specified between the EX1800 idler hub and the tensioning cylinder eye?
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