A Stump Grinders Bearing Maintenance Guide

An enormous quantity of technical bearing knowledge and process is obtainable by most bearing producers. In case you are like me, you merely wouldn’t have the time, endurance, or curiosity, in wading by all of this info, with value effectiveness being unsupported by the frequent have to outsource bearing upkeep, however but do have an curiosity in working value discount on your tree stump grinder. Substitute bearings value over £100 every, and characterize a big portion of total machine upkeep prices. This information is supposed for individuals who want to cut back value by rising bearing service life. Bearing failure or untimely bearing put on on stump grinders is especially on account of insufficient upkeep of unpolluted lubricant. I take advantage of a pneumatic grease dispenser pushed by an air compressor at every days finish of stump grinding, with a grease prime up, out within the discipline, utilizing a standard hand-held grease pump. I take advantage of quite a lot of grease however it’s far cheaper than alternative bearings. After I re-grease bearings, I completely purge out the contaminated grease, till clear grease exudes from the bearing. A excessive melting level EP-2 grease is important. I favor a molybdenum disulphide (moly) enriched EP-2 complicated grease as a result of it’s a heavy-duty grease. So, to sum up this paragraph, there are three rules of maximizing bearing life insofar as lubricants are involved:

  • choose the right grease
  • apply the right grease correctly e.g within the appropriate amount
  • re-grease incessantly

A second widespread cause for untimely bearing put on on stump grinders is insufficient or incorrect bearing adjustment ( for these machines with an adjustable bearing put on takeup) Now, I understand how awkward accessing bearings for adjustment, could be on stump grinders. I made up some specialised instruments out of allen keys, owing to their robust, top quality metal content material, as a piece round to the awkward entry drawback I’ve on my grinder. I merely floor away extra materials with a bench grinder to form an allen key right into a right-angled punch. In case you are snug doing this, please be sure you incessantly cool the allen key in water. Don’t let it flip blue in color. I come from an engineering background, and settle for that many who might learn this, don’t. Many might really feel this to be considerably out of their depth. Because of this I am making this effort to keep away from technicalities as a lot as doable with emphasis on minimal salient factors. I am not conversant with bearing entry configurations on all manufacturers of stump grinders, however I am unable to over emphasis how, with a little bit of initiative and dedication, the significance to beat a bearing entry drawback is. It’ll prevent cash.

The detection and evaluation of untimely bearing failure is by its nature a technical topic involving specialised gear e.g. warmth sensors, vibration sensors, infrared sensors, oil and ultrasound evaluation gear. All of this gear generates quite a lot of knowledge, could be very pricey, and completely impractical out within the discipline. A non technical tree stump grinder who depends upon the continuous operation of his stump grinding machine will simply be delay by this case. The simplest, most sensible and non technical approach to roughly monitor bearing efficiency is to relaxation your hand on the pillow block bearing after working it for an affordable size of time, say no less than one hour. Should you should take away your hand as a result of the bearing is just too sizzling, this means a worn bearing. Adjustment to take up extreme play throughout the bearing be made in accordance with producers directions. If the sound of a bearing “knock or rumble” can be heard, this normally means it’s excessively worn and wishes alternative. For many who my have an interest, there are 4 phases of bearing failure which I’ll contact on, because it does get entangled and isn’t in step with this scope and its goal.:

  • Stage 1. Vibration evaluation detects the earliest signal of bearing failure. Sign knowledge seems within the ultrasonic frequency vary band round 250 to 350 Kilo Hz.. At this level there may be about 10-20 p.c remaining bearing life.
  • Stage 2. Bearing failure begins to “ring” at its pure frequency (500 – 2000 Hz) At this level there may be 5 to 10% bearing life left.
  • Stage 3. bearing failure harmonics are obvious with defects within the internal and outer races. Temperature improve is now obvious with 1 to five% bearing life left
  • Stage 4. Excessive vibration is obvious with random ultrasonic noise tremendously elevated, temperature will increase shortly. One hour to at least one p.c remaining life.

It’s unlucky for all stump grinder operators, that by the point a bearing knocks, rumbles, or noticeably heats up, it’s shortly on its approach to failure. There isn’t a sensible approach for the typical proprietor / operator to precisely choose the size of serviceable time remaining in a stump grinders bearing whereas out within the discipline.

From this viewpoint, I’m attempting to attempt to accumulate some useable knowledge out within the discipline, which can show to be a sensible and cheap approach to monitor bearing serviceability. I will probably be putting in thermocouples (warmth sensors) to the bearings. If a working common temperature gradient could be established, it could show useful to these stump grinders who’re involved with maximizing their machines bearing life, by merely adjusting up their bearings, when its temperature rise signifies time to take action. It will require some effort on the a part of these . They too might want to match thermocouples to their bearings to watch temperature as the one cost-effective, and sensible approach to know when to regulate up their bearings.

This effort will probably be completely negated if a strict and enough re-greasing program will not be maintained. What could be the purpose of normal, well timed, bearing changes, if the bearings frequently ran in a mattress of contaminated grease. I feel the reader will agree, is a complete waste of effort and time.

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