KO 11077-04

Frequently Asked Questions

Q: What is the KO 11077-04 thrust bearing and what does it do in a lift truck?
A: The KO 11077-04 is a Komatsu OEM axial thrust bearing that provides radial and axial load support in electric lift truck hydraulic assemblies. It manages loads generated by mast extension, lift pressure, and side-load forces during normal forklift operations.

Q: Which Komatsu electric lift truck models use the KO 11077-04 bearing?
A: The KO 11077-04 is a factory bearing validated for Komatsu electric lift truck service. Verify your specific model and assembly against the Komatsu parts manual. Cross-reference your equipment serial range to confirm compatibility before ordering.

Q: What bearing materials and construction does the KO 11077-04 use?
A: The KO 11077-04 features hardened steel races and balls or rollers, sealed or unsealed design depending on assembly location, and precision tolerances for smooth rotation under sustained load. Its construction resists corrosion and wear in the hydraulic environment typical of lift truck mast cylinders.

Q: How do I know when the KO 11077-04 bearing requires replacement?
A: Replace the bearing if you observe grinding or chattering noise during mast operation, visible play or wobbling in the bearing assembly, leakage from the bearing housing, or resistance to smooth rotation. Bearing failure typically results from inadequate lubrication, contamination, or overload fatigue.

Q: Does the KO 11077-04 require routine lubrication and maintenance?
A: Maintenance depends on bearing type and seal design. Sealed bearings require no routine lubrication. Unsealed bearings require periodic relubrication per the equipment manual using specified hydraulic oil or bearing grease. Inspect during regular maintenance for contamination, leakage, and noise. Replace immediately if performance degrades.