Helical gearsets
Carburized and ground helical gears on parallel shaft Lightnin drives, re cut or reground with proper tooth contact set by hand.
Houston, TX ยท Lightnin mixer gear drive repair
Lightnin Mixer Gear Drive Repair and Rebuild
Lightnin, now part of SPX FLOW, builds some of the most widely used mixers and agitators in process plants. If you run tanks anywhere along the Houston Ship Channel or out in the field, you have probably turned an impeller with a Lightnin drive. We see the whole range come through our shop, from medium torque top entering units like the 70 Series, Series 80, and Series 10, to the high torque 98 and 980 Series, the SanStar sanitary mixers, and the side entering RSE and VSA families. The common thread is the gear drive that sits on top of the tank and takes the full job of turning a long, heavily loaded shaft hour after hour.
We repair and rebuild Lightnin mixer and agitator gear drives at our Houston shop. That covers the parallel shaft and right angle reducers on top entering, side entering, and sanitary Lightnin units, including helical gearing, thrust bearing stacks, output shafts, and seal cartridges. We are an independent shop, not an SPX FLOW dealer, and we rebuild these drives as an OEM alternative.
Our shop is built for exactly that kind of work. We are a family owned gear shop in Houston, established in 1998, and we do every step of a gearbox repair in house, from teardown and inspection to gear cutting, bearing fits, and the final test run. We rebuild Lightnin mixer drives stronger than OEM where the design allows it, and we back the work with up to a 24 month workmanship warranty. To be clear up front, we are an independent repair shop. We are not an authorized Lightnin or SPX FLOW dealer and we are not affiliated with them. We name the brand only to describe the equipment we service, and we rebuild these units as an OEM alternative when you want your drive back fast and at a fair price.
Because we offer free shipping both ways and free pickup and delivery, where your tank sits does not change anything. Send us the drive, or let us pull it, and we handle the rest. We also handle the larger family of process drives this same way, so if you have pump drives or other reducers in the same plant, they can ride along.
What a Lightnin mixer gear drive actually has to do
A mixer drive is a hard service for a gearbox. Unlike a conveyor reducer that mostly sees torque, a Lightnin drive carries a long impeller shaft hanging straight down into the vessel. That puts a steady thrust load and a bending load on the output bearings every second the mixer runs, plus whatever hydraulic loads the impeller throws back up the shaft. The gearset has to deliver high torque at low speed, usually somewhere between 20 and 100 RPM on the bigger top entering units, while keeping the shaft running true so the seal at the tank does not leak.
Lightnin handles this with some smart design choices, and those same choices tell us where the wear shows up. The 98 and 980 Series use a parallel shaft, double reduction layout with carburized and ground helical gearing, which runs quiet and lasts when it is fed clean oil. Many units use a one piece cantilever output shaft to hold runout down, a fixed bearing in the seal cartridge to absorb radial and axial load, and a True Dry Well cast into the housing so oil cannot weep down the shaft into your product. Right angle drives like the SanStar SR use spiral bevel gearing to put the motor sideways under a low headroom tank. When any of that gives up, the symptoms are usually the same: noise, heat, vibration, or oil where it should not be.
How Lightnin drives fail and what we rebuild
Most of the Lightnin drives that reach us fall into a handful of failure patterns, and we have seen each one many times:
- Thrust and output bearing fatigue. The lower bearing stack carries that constant downward pull from the shaft. Run it long enough, or starve it of oil, and you get spalling, brinelling, and play. We renew the entire stack, not just the obvious bad one, and reset the preload correctly.
- Helical or bevel tooth pitting and wear. Contaminated oil, water ingress, or years of duty pit the tooth flanks and open up backlash. We measure the set, then regrind or re cut gears and set proper tooth contact rather than slapping in a worn used part.
- Output shaft wear at the seal journal. A cantilever shaft is built to run true, but a worn seal or grit will groove the journal so the new seal leaks on day one. We build the journal back up and machine it true.
- Oil leaks past the lower seal and cartridge. When the dry well or cartridge seal gives up, oil heads for the batch. We rebuild the cartridge and the sealing surfaces so it holds.
- Lube pump and forced lube failures. On high torque units with an integral positive displacement pump, a failed pump or clogged filter starves the gears and bearings and cooks them. We restore the lube circuit and verify flow.
Whatever the failure, the fix relies on real gear work. Cutting fresh teeth is what we do, and you can read more about that on our gear cutting page. The same goes for the bearing side, where correct fits and preload make or break the rebuild, covered on our bearing repair page.
Our rebuild process, start to finish
Every Lightnin drive gets the same disciplined path. We tear it down completely, photograph and document the failure, and clean every part so we can actually see the metal. Then we measure: gears, bearing journals, shafts, and bores all get checked against spec so we know what is reusable and what is not. From there we cut or regrind gears as needed, machine shafts back to true, fit new bearings and seals, and reset gear contact and bearing preload by hand.
Before anything ships back, the rebuilt drive runs on our test stand so we can listen for noise, watch for leaks, and confirm it does not overheat. When it passes, it ships with up to a 24 month workmanship warranty. Inspection is free, pickup and delivery are free including crating and rigging, and shipping is free in both directions, so a failed mixer drive does not turn into a budget fight before the work even starts.
Houston plants and the industries that run Lightnin
We are based at 8449 West Belfort Ave in Houston, which puts us in the middle of the exact industries Lightnin equipment was built for. Around here that means refineries and petrochemical plants blending and reacting in big tanks, water and wastewater treatment running agitators day and night, and fertilizer, solvent, and biofuel producers up and down the Gulf Coast. Food, beverage, dairy, and pharmaceutical plants run the sanitary SanStar units, and personal care and specialty chemical shops run the medium torque top entering mixers.
For local plants, our pickup and delivery turns a drive swap into a simple call. For everyone outside Houston, free shipping both ways means distance is a non issue. If your operation also runs other heavy gear, we cover a wide range across the industries we serve, including dedicated work for the oil field and for mining equipment. One shop, all of it in house.
What we repair and rebuild
What we fix.
Spiral bevel gears
Right angle gear sets on low headroom and side entering units, inspected, lapped, or replaced and set to correct backlash.
Thrust bearing stacks
The lower output bearings that carry the constant downward shaft load, renewed as a full stack with reset preload.
Output and impeller shafts
One piece cantilever output shafts straightened, built back up at worn seal journals, and machined true to cut runout.
Seal cartridges and dry wells
Replaceable cartridge seals and dry well sealing surfaces rebuilt so oil stays out of your product.
Forced lubrication systems
Integral positive displacement lube pumps and filters on high torque units restored and flow verified.
Housings and bores
Cracked or worn gearbox housings repaired and bearing bores line bored back to size.
Double and single mechanical seals
Dry running and lubricated double mechanical seal arrangements rebuilt and pressure checked.
Common questions
What plants ask us.
Are you an authorized Lightnin or SPX FLOW dealer?
No. We are an independent gear shop in Houston and we are not affiliated with Lightnin or SPX FLOW. We repair and rebuild these mixer drives as an OEM alternative, and we name the brand only to describe the equipment we service.
Which Lightnin mixer models do you rebuild?
We rebuild the full range, including medium torque top entering units like the 70 Series, Series 80, and Series 10, the high torque 98 and 980 Series, SanStar sanitary mixers, and side entering RSE and VSA drives. If you are not sure of the model, send us a photo of the nameplate and we will tell you.
My drive is leaking oil down the shaft. Can you fix that?
Yes. That usually means the lower seal, the seal cartridge, or the dry well sealing surface has worn, often along with a grooved shaft journal. We rebuild the cartridge, machine the journal true, and fit new seals so it holds.
How does shipping and pickup work if I am not in Houston?
Shipping is free in both directions, and we handle crating and rigging on pickup and delivery. Distance does not change the price. For Houston area plants we offer local pickup and delivery since the shop is our home base.
What warranty comes with a rebuilt Lightnin drive?
Every rebuild runs on our test stand before it ships and carries up to a 24 month workmanship warranty. Inspection is free, so you can find out what is wrong before you commit to anything.
Get your Lightnin mixer drive back in service
Free shipping both ways, free inspection, and an up to a 24 month warranty on every rebuild. Tell us about your unit and we reply fast, often the same day.
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