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Clean mounting surfaces thoroughly before assembly.

Verify correct idler wheel part number for your specific machine serial number range.

Inspect the idler shaft for wear, scoring, or corrosion.

Check idler wheel bearings for smooth rotation and no play.

Apply recommended anti-seize compound to the idler shaft.

Align the idler wheel perfectly with the sprocket and carrier rollers.

Use proper lifting equipment due to the heavy weight of the assembly.

Tighten mounting bolts to the specified torque in a crisscross pattern.

Install and adjust the track tension according to the manual after installation.

Ensure proper track chain engagement with the idler wheel teeth/flange.

Verify idler wheel axial play is within specified limits after installation.

Grease the idler wheel (if equipped with fittings) to the specified amount.

Check the idler guard for damage and reinstall it securely.

Use new seals and O-rings provided in the repair kit.

Inspect the track frame for cracks or damage at mounting points.

Follow the specified run-in procedure for new idlers and bearings.

Ensure the idler can float slightly on its mounting to self-align with the track.

Prevent contamination of bearings during installation—keep work area clean.

Use a dial indicator to check idler wheel runout if necessary.

Verify compatibility with your machine's track shoe width.

Install any shims exactly as removed or as specified in the manual.

Check the recoil spring assembly (if applicable) for proper function and preload.

Do not heat the idler wheel or shaft for installation unless specified.

Perform a visual track alignment check after tensioning.

Test machine travel in both directions at low speed initially.

Monitor idler temperature during initial operation for excessive heat.

Listen for unusual noises from the idler area during first hours of use.

Re-check mounting bolt torque after the first 50 hours of operation.

Follow all lockout/tagout procedures when working on the undercarriage.

Consult the Komatsu service manual (SEM) for the complete, model-specific procedure and all precise specifications.

Brand Name
Fox-part

Place of Origin
Guangdong, China

Warranty
6 months

Video outgoing-inspection
Not Available

Machinery Test Report
Not Available

Product name
Main Relief Valve

Part number
4654857

Application
Excavator

Model
EX200-5 ZX330-5G

Quality
High-Quality

Payment
TT.Money Gram.Western Union. Paypal

Shipment
DHL FEDEX TNT EMS UPS

Nitrile Rubber (NBR) base tube for excellent fuel and oil resistance.

Hydrogenated Nitrile (HNBR) for enhanced heat and chemical resistance.

Synthetic rubber compound optimized for diesel and biodiesel exposure.

High-temperature resistant material (typically rated for -40°C to +120°C+).

Multi-layer reinforcement with textile or polyester cord braid.

Steel wire braid reinforcement in some high-pressure variants.

Abrasion-resistant outer cover made of weather-resistant synthetic rubber.

Non-conductive rubber construction to prevent static buildup.

Ozone-resistant compound to prevent outdoor degradation.

Low-permeability liner to minimize fuel vapor emissions.

SAE J30 R7/R9 compliant material specification for fuel lines.

ISO 3800/SAE J30R7 standard for low-pressure fuel return hoses.

Bio-diesel compatible material formulation (B20/B100 capable).

Anti-swelling additive package to maintain dimensional stability.

Flexible yet crush-resistant construction for engine compartment routing.

Molded end fittings with brass or steel connectors for leak-free sealing.

Heat-reflective sleeve option available for near-exhaust routing.

Factory-installed spring guard option for bend radius protection.

Color-coded (typically black with blue/tan stripes) for identification.

Factory-applied part number markings printed along the hose length.