Product Description
ZERK
Frequently Asked Questions
Q: What is the TO 00591-00599-81 and where is it used?
A: The TO 00591-00599-81 is a Toyota OEM Zerk fitting (also called a grease nipple). It is used on Toyota electric lift truck wheel and mast assemblies to provide a lubrication point for greasing bearing and articulation components without disassembly.
Q: What is a Zerk fitting and how does it function?
A: A Zerk fitting is a one-way ball-check valve that accepts grease gun tips for lubricating sealed joints and bearings. The TO 00591-00599-81 allows fresh grease to be injected into the joint or bearing while preventing backflow of old grease or contamination when the grease gun is removed.
Q: What material is the TO 00591-00599-81 made from?
A: Toyota OEM Zerk fittings like the TO 00591-00599-81 are typically constructed from hardened steel with a nickel-plated or phosphate-coated finish to resist corrosion and wear in warehouse and industrial environments.
Q: How do I know if a Zerk fitting needs replacement?
A: Replace the TO 00591-00599-81 if the grease gun tip does not seat properly or slips off, if grease leaks from the fitting when not in use, if the fitting threads are stripped or corroded, or if the internal ball-check valve is clogged or damaged. These conditions indicate the fitting cannot function properly for lubrication.
Q: Can I use a standard Zerk fitting if the OEM TO 00591-00599-81 is unavailable?
A: Only if the replacement Zerk fitting matches the thread size and connection type of your Toyota lift truck assembly. Verify thread pitch, body diameter, and inlet connection specifications. Using an incompatible fitting may cause leaks, inadequate lubrication, or component damage.
Q: What is the typical maintenance interval for Zerk fittings?
A: Inspect Zerk fittings during each scheduled lubrication cycle. Remove any corrosion or dirt around the fitting entrance. Clean the nipple before inserting the grease gun tip to prevent contamination. Replace the fitting if it shows signs of damage or does not accept grease gun pressure.