SureMotion LACP2 Series Linear Slide Rebuild
SureMotion LACP2 Series Linear Slide Rebuild

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

1 thought on “SureMotion LACP2 Series Linear Slide Rebuild”

  1. R Hamann says:

    How about throwing a couple of the brass crush washers in the rebuild kit?

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