Tenoner Lubrication Guide

Proper lubrication is the foundation of long-term tenoner maintenance. Bearings that run too dry wear out prematurely; bearings that are over-greased run hot and fail even faster. Arbor bearings in particular require precise greasing intervals, exact quantities, and active temperature monitoring to deliver the decades of reliable service that a Mereen-Johnson tenoner is designed for.

This guide walks through the complete tenoner lubrication program — general preventive maintenance setup, recommended greases and oils, air mist lubricator requirements, ball screw lubrication, feed drive gear unit specifications (with ambient temperature ranges), and the detailed arbor bearing greasing and temperature monitoring procedure.

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Preventive Maintenance: General Setup

This equipment requires lubrication every 200 to 400 running hours. Each bearing’s grease fitting should receive a sufficient amount of grease to purge a portion of the existing grease from the bearing cage. Experience, along with knowledge of bearings and their applications, dictates the particular amount each bearing needs — one ounce by volume (not weight) is sufficient in most applications.

Caution: Excessive greasing will cause the bearings to run HOT. This is the single most common lubrication mistake on tenoners and a leading cause of premature bearing failure.

Before putting the tenoner into regular service:

1. Oil the entire machine. The machine has been properly greased at the Mereen-Johnson assembly floor before shipping, but a full oiling on installation ensures all moving surfaces are protected from the first cycle forward. Do not regrease the motor bearings.
2. Set up a lubrication schedule. Use the specifications below as the basis for a written schedule your maintenance team can follow.

Recommended Greases

For oil cups, use SAE #10 or #20 non-detergent high-quality automotive oil.

For general bearing greasing, Mereen-Johnson recommends the following greases (or their equivalents):

Air Mist Lubricators

Air mist lubricators require SAE #10 non-detergent high-quality automotive oil. Machines operated in a cold climate (below 23°F) or in an unheated building will require a lower-temperature mist oil. Mereen-Johnson offers Low Temperature Mist Oil “MJ-100” for these conditions.

Note: “MJ-100” is not recommended for the Bijur Spin Rev® lubricators that lubricate the front motor bearings. Use the standard SAE #10 oil on those units regardless of ambient temperature.

Ball Bearing Screws & Preload Assemblies

If your tenoner is equipped with ball screws, keep the screw coated with a thin film of oil or light grease for satisfactory service under normal conditions. Most ball screw applications may use a light oil; applications with low or intermittent duty cycles may be greased once for life. Each application should be individually analyzed for lubrication selection.

Proven lubricants for ball screw applications:

• Standard Oil Waytax #95
• Mobil-Vactra #4

Feed Drive Gear Unit

The feed drive gear unit requires different oil specifications depending on ambient air temperature. Use the chart below to match the correct oil to your operating environment.

Ambient Air Temperature +5°F to +77°F

Ambient Air Temperature +32°F to +104°F

Arbor Bearing Greasing & Temperature Monitoring

Arbor bearings are the most critical lubrication point on the tenoner and require a specific greasing procedure plus active temperature monitoring to prevent failure.

Standard Greasing Procedure

For grease gun applications by volume, inject 1/3 ounce of Lube Master “Courier” every 400 hours of operation. Monitor the bearing temperature weekly and immediately after greasing — up to 150°F can be considered normal.

Adjust the greasing interval if temperature monitoring indicates the bearing needs it. If the temperature rises steadily week after week to over 200°F, grease the bearings even if 400 hours have not elapsed — then monitor the bearing after greasing.

If the temperature rises dramatically after greasing, too much grease was likely added. If this occurs:

1. Open the bearing housing
2. Remove the excess grease
3. Close the bearing housing
4. Run the arbor, monitoring the temperature

Annual Bearing Inspection

Once yearly, open the bearing housings and inspect the condition of the grease. If contamination is evident, wipe out the excess grease, then clean and repack to the recommended packing instructions below.

Bearing Repacking Procedure

For repacking existing bearings or packing new ones, use Lube Master “Courier” grease at 30% fill — 26.7 grams (29.7 cc). Follow this break-in procedure:

1. Jog the arbor 3 or 4 times, but do not allow the arbor to reach full speed. Allow the arbor to stop rotating completely between jogs.
2. Run the arbor at full speed for one minute.
3. Shut down and allow the bearings to cool to approximately ambient temperature.
4. Run the arbor while continuously monitoring the temperature. If the temperature exceeds 180°F, shut down and replace the bearings. Try again.
5. Place the machine into production.

About Molylube 126 EP Grease

Molylube 126 EP is a fibrous aluminum complex grease formulated with molybdenum disulfide and molbuamin to provide anti-wear and extreme pressure properties. When heavy bearing loads are encountered and boundary lubrication occurs, the molbuamin and molybdenum disulfide are activated to form a continuous monomolecular film on metal surfaces — resisting metal-to-metal contact and reducing wear in contact lubrication conditions.

Molylube 126 EP also performs well under hydrodynamic lubrication conditions because of its mechanical stability. Its water resistance and high drop points make it a strong choice for multi-use applications.

Typical Specifications

Related Maintenance and Reference Guides

For additional support on your tenoner, review these related resources:

• General troubleshooting guide
• General saw safety guide
• Alemite lubricator service guide

Need Service or Replacement Parts?

If your tenoner is showing signs of premature bearing wear, running hot despite following the lubrication schedule, or you’re planning a full bearing rebuild, our factory service team can help. Mereen-Johnson technicians maintain the original manufacturing records and parts inventory for every tenoner we’ve built, which means we can source exact-fit bearings and components and provide guidance on application-specific lubrication questions.

Contact Mereen-Johnson service or call (612) 529-7791 to speak with a factory technician about your tenoner.