World Combine Harvester ZKB80 ZKB85 Walking Gearbox Repair Kit | ZKB80-304-002, ZKB85-203-100-1, ZKB80-305-004, ZKB85-307A-001, ZKB80-305-001PART Gears & Spline Shaft

Full Product Description

This complete walking gearbox repair kit is specially designed for WORLD ZKB80 and ZKB85 series combine harvesters. It covers 5 core internal transmission parts for gearbox overhaul. When your harvester suffers broken teeth, slipping clutch or abnormal transmission noise, this kit provides reliable replacement components.

All parts are manufactured to match original OEM specifications. Made of high-quality forged steel for excellent wear resistance and long service life. Suitable for farm maintenance shops, harvester dealers and global agricultural machinery importers. You can buy the full set or purchase individual spare parts separately.

Key Features

✅ OEM standard dimension, direct replacement, no modification needed 

✅ Forged steel material with professional heat treatment for high hardness & wear resistance 

✅ Strict quality inspection before delivery 

✅ Flexible order: Full kit or separate single parts available 

✅ Compatible with WORLD ZKB80, ZKB85 combine harvester walking gearbox 

✅ Support bulk wholesale for agricultural machinery distributors and repair workshops

Parts List & Specifications

1. ZKB80-304-002 Dual Idler Gear (16T/39T)Dual idler gear for ZKB80 walking gearbox. Precision machined gear teeth, stable transmission, reduces gear impact during heavy load operation.

2. ZKB85-203-100-1 Central Clutch Gear ShaftDimension: Length 300mm, Diameter 37.5mm. Central clutch spline shaft, critical power transfer component for the gearbox. Strict heat treatment for anti-torsion performance under continuous working conditions.

3. ZKB80-305-004 Drive Gear 39T, Inner Spline 20T39 teeth drive gear with 20 inner splines. Fits ZKB80 gearbox. High hardness after heat treatment, resistant to abrasion under long harvesting workload.

4. ZKB85-307A-001 Stepped Gear 17T, Inner Spline 18T17T gear with shoulder step, 18 inner splines. Custom stepped structure to fit original gearbox assembly. Perfect replacement for worn or broken original gears.

5. ZKB80-305-001PART Spline ShaftMatching transmission spline shaft for ZKB80 gearbox. Precision spline processing to guarantee good fitting and smooth power output.

Application

For WORLD combine harvester ZKB80 / ZKB85 walking gearbox maintenance & overhaul. Widely used in grain harvesting farms and machinery service centers.

Notes

Please confirm the OEM part number and harvester model before ordering to ensure correct matching. Send us your gearbox photos if you are unsure about the part compatibility.

Inquiry

Send inquiry for unit price, MOQ, delivery time and packing details. We support sea container shipment together with other harvester spare parts.

FAQ

Q1: Which harvester models do these gearbox parts fit?

A: These spare parts are designed for WORLD ZKB80 and ZKB85 combine harvester walking gearbox only. Please double-check your OEM part number before purchase.

Q2: Can I buy a single part instead of the full repair kit?

A: Yes. We support both full kit purchase and individual separate parts. You can tell us the OEM part number(s) you need in your inquiry.

Q3: What material are these gears and shafts made of?

A: They are made of forged steel with professional heat treatment, featuring high hardness, torsion resistance and long service life under heavy harvesting load.

Q4: Are these OEM replacement parts? Do they match original sizes?

A: They are aftermarket replacement parts manufactured strictly according to OEM drawing dimensions. Direct installation without extra modification if your machine matches the part number.

Q5: What is your MOQ?

A: Small MOQ available for trial order. Lower unit price for bulk wholesale for distributors and repair workshops. Contact us to get quotation.

Q6: How to confirm compatibility if I am not sure?

A: Please send us photos of your old broken part, gearbox nameplate or original part number. Our technical team will verify matching for you.

Q7: What is the lead time and shipping method?

A: Normal lead time 7–15 working days. Goods can be shipped by sea, air or express. We can combine this order with other harvester spare parts into one container to save logistics cost.

Q8: What quality inspection do you perform before shipment?

A: Every gear and spline shaft undergoes dimension checking, tooth inspection and hardness testing. We will take photos for confirmation before packing.

Usage Guide

Installation Guide

1. Before disassembly: Record the assembly sequence and gear meshing position of your walking gearbox. Take photos for reference.

2. Clean the gearbox housing thoroughly, remove metal debris, old oil residue and damaged bearings.

3. Install new gears and spline shafts one by one according to the original assembly sequence. Check spline fit and gear backlash manually.

4. Verify no jamming after assembly. Refill with proper gear oil.

5. Test run the harvester at low speed first, check for abnormal noise, vibration or oil leakage. Stop immediately if any fault occurs and re-inspect.

Maintenance Tips

• Check gear oil level and oil quality regularly during harvest season. Replace gear oil as recommended.

• Avoid continuous overload operation which causes gear tooth breaking and shaft twisting.

• If you hear abnormal noise inside the gearbox, stop working at once to prevent further damage to other transmission components.

Important Notes

⚠️ Professional agricultural machinery technician is recommended for gearbox disassembly and installation. Improper assembly will lead to gear damage and machine failure. 

⚠️ Keep all parts away from impact before installation to avoid deformation. 

⚠️ Confirm all OEM numbers before ordering. Wrong model parts cannot be returned due to mismatching.