In this video we will show you how to rebuild our second generation LACP2 series of linear slides from Sure Motion.
In this video we will demonstrate how to rebuild one of AutomationDirect's LACP2 series of linear actuators. This is the second generation of compact slides. If you have a first generation, please refer to the rebuild videos for that series. You can find the written instructions on AutomationDirect's website by following the link on the product page. I would encourage you to either have the instructions available online or, simply print them out and have them handy while rebuilding the slide. I am rebuilding an LACP2- 16T36L1 slide that has 36 inches of travel and a 1-inch pitch which will require the repair kit with 1-inch lead screw pitch. There is a separate kit for lead screws with a 0.5-inch lead screw pitch. The instructions are the same for both kits. This slide has a damaged lead screw nut, so it will be a perfect example to rebuild. Let's begin. I am using the rebuild kit part number LACPACC-007. This kit comes with two bearings, one slide liner, two flat head cap screws, one lead screw nut and one lubrication pen applicator. You will need the following tools: 1.5 mm, 2.5mm and 5/64-in allen wrenches. Locktite 425 thread locker fluid, cleaning towels and safety glasses. I also have a 12mm combination wrench, a torque wrench, acetone for cleaning and protective gloves. First, using a 2.5 mm allen wrench, loosen the shaft coupler on the Linear Slide side, not the motor side. Remove the four motor screws and remove the motor and coupler. The motor on this slide had already been removed, so we simply remove the coupler by using a 2.5mm allen wrench. Loosen the lock nut set screw with a 1.5mm allen wrench. Don't take the set screw out, just loosen it. Here is the tricky part. There is a very small brass crush washer under the set screw on each lock nut. You can see how tiny it is. Make sure you have the slide on a clean surface, so you don't lose the brass washer. I put white paper under the slide so I could see the brass washer. This brass washer keeps the set screw from damaging the slide screw. You can usually remove the lock nut by hand, but if it is tight, use a 12 mm wrench to loosen it. On the opposite end from the motor end, loosen the square lock nut. The instructions say that if either square nut is tight, to hold on to the carriage. On this unit, the carriage lead nut is broken, so we use a second 12mm combination wrench to hold the opposite end. Remove both square lock nuts. Again, don't lose the brass washer. Loosen the two tapered screws on the carriage with a 5/64 hex key. Now the carriage assembly should be loose. Once both square lock nuts are removed, and the carriage assembly is disconnected, pull the lead screw out through the motor end. Slide the carriage assembly off of the opposite end. Remove the lead screw bearings from each end and discard. Remove the lead screw nut. Clean all components with acetone and inspect. Now we can start to re-assemble the unit. Install the new lead screw nut onto the lead screw. Lubricate the lead screw. There is a spring in the bottle you can use to help mix up the lubricant in case there was any settling. Apply a little lubricant to the lead screw and slide the new lead screw nut the full length to check for tightness. Clean any buildup and debris that may prohibit travel. Install a new bearing on the motor or drive end of the lead screw and install one of the square lock nuts. Make sure to re-install the brass crush washer. I use a little dab of grease to hold the washer to the end of the set screw and insert the set screw facing up so the brass washer does not fall out. Do not tighten the set screw. Install the new slide bushing liner. Make sure the tab on the back is properly seated into the slide carriage. Insert the lead screw into the motor side of the base. Make sure the bearing is fully seated in the base. Install a new bearing on the opposite side. Install the lock nut with brass crush washer. Tighten the square lock nut, but do not tighten the set screw yet. Using a 2mm allen wrench, loosen the two slide adjusting screws on one side, then repeat on the opposite side. Carefully slide the carriage onto the slide tube. We can now slide the carriage from end to end freely. The instructions say to vigorously move the slide carriage. Now we can adjust the slide bushing bearings by using a 2mm allen wrench to tighten in very small increments, then test by vigorously sliding the carriage back and forth. Once the bearings have been adjusted, we can attach the carriage to the lead screw nut. Apply Loctite 425 to the threaded holes of the lead screw nut and to the two flat head screws. Be careful not to get any Loctite on any of the sliding surfaces! Align the carriage to the lead screw nut, insert the two flat head screws and tighten. The recommended torque is 6-inch pounds. At this time, both end square lock nuts should only be finger tight. Move the carriage from end to end to test for ease of motion. Re-adjust to eliminate any clearance issues. Make certain the bearings are seated against the shoulders. Over tightening the end nuts on the bearings can lead to premature bearing failure. Once tightened properly, tighten the set screws on both ends. Reassemble the coupler and the motor. Use the lubrication pen to apply a liberal amount of lubricant to the slide tube and the lead screw. Move the carriage through the full travel to ensure the lubricant has been distributed. Wipe away any excess lubricant. If you have any questions about these linear slides, please contact AutomationDirect's free award- winning tech support during regular business hours. They will be happy to help. Thank you for watching.