25 5. Install the coupling hub. It should be mounted so the end of the shaft is flush with surface “A” as shown in fig. 8. It is acceptable for the shaft to extend past “A” as long as it is not past the teeth shown as “B.” 6. Install the flanged hub using the spacer body and insert to locate the flanged hub on the drive shaft. This will set the hubs at the minimum hub gap (G ) min dimension when the insert is tight between the coupling hub and spacer body, ensuring proper clearance. For specific G and G dimensions Min max see table 16. 7. Tighten the flanged hub and coupling hub securely to the shafts using the set screws. 8. Check coupling for misalignment (table 17) and align as necessary. 9. Install the cover: a. High-speed cover: Slide the cover over the coupling hub and insert until fully rested against the shoulder of the coupling hub. QF5 through QF175 use standard snap rings to hold the cover in place. QF250 and larger couplings use eight bolts and washers. Use the included hardware to secure the cover. b. Low-speed or high-performance split cover: Place each half over the insert and secure using the four bolt/washer/nut hardware combinations supplied. For the high-performance split cover bolt tightening torque ratings, see table 15. c. High-speed split cover (HVSP): Match the four pieces into two complete cover halves using the flange face detail to distinguish the two halves. For QF250 and larger, make sure the cover half with the eight holes for mounting to the coupling hub is on the coupling hub side, not the spacer side. Bolt the four pieces together using the supplied hardware, ensuring the splits in each half are rotated 90 degrees relative to each other. Install the bolts to secure the cover to the coupling hub. 10. Ensure the four spacer body bolts through the flange are tight along with all other bolts and set screws. Note: Standard hubs are supplied with a clearance fit and should slide onto the shaft without excessive force. If the hubs have been ordered with interference fit, then heat the coupling halves to approximately 300° C (572° F) before installing on shafts. If not heated properly, the couplings will not fit on the hub properly. Table 15. Cover Bolt Tightening Torque Revolutions Per Minute (RPM) andBalance The QUICK FLEX coupling is machined on all surfaces and thus its dynamic balance is good. If the coupling is run at a high speed, it is important that the key used to attach the coupling hubs is the same length as the coupling hub. The set screws should also be changed to full length to fill the hole. Please refer to table 18 for maximumRPM ratings. Fig. 8. Proper shaft-to-hub engagement Note: Shaft should penetrate to base of teeth and hubs should be set at G . Otherwise, the couplingmay not deliver maximum torque. Min WARNING Failure to observe the following warnings could cause the power transmission product to break and parts to be thrown with sufficient force to cause serious injury or death. Contact with moving parts and/or rotating shafts poses a risk of serious injury. Proper guards in accordance with OSHA and American Society of Mechanical Engineers standards must be installed on all power transmission equipment. Power transmission equipment should not be started if proper guarding is not in place. Observe all required lock out/tag out procedures when servicing power transmission equipment. Quick Flex Couplings Installation Guide www.jbj.co.uk/couplings.html #DriveLineHarmony
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