28 Double-Ended Spacer Coupling Installation Please complete the following steps to install QUICK FLEX double-ended spacer couplings. You should have the following pieces before starting the job: » Two hubs » One spacer body » Two inserts » Two covers with included hardware Note: It is critical to identify what style cover you are using, as this will change the hardware included, as well as the installation procedure. A mismatch between the coupling and the applicationmay result in less than optimal performance. There are four types of covers as seen in the diagrambelow. » High-speed cover: QF5 through QF175 use a standard snap ring to secure cover in place. QF250 and larger use eight bolts with lock washers. » Low-speed split cover: This cover is free-floating and is located outside the shoulders of the two hubs. All sizes come with four bolts for securing the two halves together around the insert. » High-speed split cover (HVSP): This cover will be supplied in four pieces to fit over the spacer body. QF15 through QF250 use eight bolts around the rim to secure the two halves together, QF500 through QF1890 use 16 bolts, and QF3150 and larger use 20 bolts. QF250 and larger use eight bolts with lock washers to secure the cover to the hub. » High-performance split cover: This cover is free-floating and is located on the insert with an internal radial groove. All sizes come with four socket-head cap screws for securing the two halves together around the insert. Installation 1. Check the bore size of the coupling halves and the shafts. Ensure that they are the correct bore size to fit the application. 2. If the coupling does not fit easily, clean and deburr the shafts. 3. Identify cover style: a. If using high-speed covers QF5 through Qf175, slide one snap ring down each shaft, then slide one cover onto each shaft with the larger opening facing the shaft separation. For QF250 and larger, slide one cover onto each shaft with the larger opening facing the shaft separation. b. If using a low-speed or high-performance split cover, leave cover aside and continue to step 4. c. If using a high-speed split cover (HVSP), Qf250 and larger, use bolts and washers to secure in place. In some instances, one or both vertically split pieces cover halves will also be split horizontally. The horizontally split half should be placed on the spacer body side. If both halves are split then splits should be aligned 90 degrees fromeach other when bolted together. Do not bolt to coupling hub until installation is complete. 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. Quick Flex Couplings Installation Guide High Speed Cover Low Speed Cover High Speed Split Cover (HVSP) High Performance Split Cover Fig. 9. QUICK FLEX cover types and included hardware. #DriveLineHarmony www.jbj.co.uk/couplings.html
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