ATTENTION: Important Technical Bulletin Regarding Conveyor TorqLOCs
An advantage of the TorqLOC system we use on our conveyors is that it can slip when the conveyor instantly stops due to an obstruction. By slipping slightly, the lock prevents damage a split keyway would otherwise inflict on the shaft, damage which would require the shaft’s replacement.
PLEASE NOTE the slip has released the tension in the system and must be reset. When your conveyor kicks out, or you know it has been impacted with a sudden stop, it is CRITICAL that you retorque the TorqLOC before restarting.
The incidence of this causing an issue in operations is rare, but we get reports of it occasionally. It is our contention that the TorqLOC is superior to a keyway because a keyway weakens a shaft and creates a stress concentration. The TorqLOC has proven to reduce the number of shaft failures across our conveyor population overall.
We think it may also be a good idea to just check the torque on our conveyors during normal shutdowns as part of the PM process.
See below for instructions on installing and torqing the SEW system:
TorqLOC ® Installation and Maintenance
Below is the Mechanical Installation for SEW TorqLOC ® motors. See the full Sumitomo manuals for additional information.
For video instructions, visit https://youtu.be/-uuxTfoqIXc.
1. Clean the customer shaft and the inside of the hollow shaft with a degreasing agent. Ensure that all traces of grease or oil are removed.
2. Install the stop ring (clamping ring) and the bushing on the shaft.
3. Apply NOCO ® Fluid (assembly paste) on the bushing and spread evenly.
4. Push the bushing into the gear until up to the stop.
4. Push the bushing into the gear until up to the stop.
5. Secure the bushing with the stop ring. Tighten the split ring on the bushing using the appropriate torque as specififed in the following table:
6. Make sure all screws are loosened and slide the shrink disk onto the hollow shaft.
7. Slide the counter bushing onto the customer shaft and into the hollow shaft until the shrink disk is properly seated. DO NOT LUBRICATE COUNTER BUSHING.
8. Tap lightly on the flange of the counter bushing to ensure that the socket is fitted securely in the hollow shaft.
9. Make sure the customer shaft is seated in the counter bushing.
10. Manually tighten the screws of the shrink disc and ensure that the outer rings of the shrink disk are parallel.
11. Tighten the locking ring bolts by working round several times from one bolt to the next (not in a diametrically opposite sequence). Note the exact values for the tightening torques are shown on the shrink disk. Make sure the remaining gap between the outer rings is > 0 mm. Use the following table to determine torques and distances.
12. Make sure the remaining gap between counter bushing and hollow shaft end as well as bushing and stop ring is also > 0 mm (a).
⚠ IMPORTANT You must retorque the TorqLOC ® several times at startup. While SEW says this is not needed, we have found it necessary in practice. After startup, stop the conveyor and retighten the TorqLOC ® to the suggested torque. Then run and stop the conveyor, tightening the TorqLOC ® as necessary. Repeat as needed.
⚠ IMPORTANT Check the torque one (1) week after startup then again after two (2) weeks. Retighten the torque as needed.
