/ Marley HP7000 Fan / User Manual 97-1342B
Fan Components 174 45 ft·lbƒ (61 N·m) 173 172 171 122 121 150 ft·lbƒ (204 N·m) 101 HUB ASSEMBLY IDENTIFICATION NUMBER 123 300 SEE FIG 6 FOR DETAILS 15 ft·lbƒ (20 N·m) 140 OUTBOARD ROW NOT REQD ON 52 HUB ASSEMBLY 133 120 ft·lbƒ (163 N·m) 132 200 100 102 Hub 101 Hub Center 102 Hub Plate 110 Kit–Blade Clamp 111 Blade Clamp 120 Kit–Center Hub Hardware 121 Cap Screw 5/8″ 122 Flat Washer 5/8″ 123 Pin 1/2″ 130 Kit–Blade Clamp Hardware 131 Machine Bolt 3/4″ 132 Flat Washer 3/4″ 133
Fan Hub Installation The following instructions detail the process for installing a Marley HP7000 fan on a Marley Geareducer® with a tapered fan (output) shaft utilizing a bolted fan hub retention plate or a straight fan shaft using a split taper bushing. Installation on other gear reduction units may be different. Contact your Marley sales representative for supplemental instructions if required.
Fan Hub Installation 1 1/2" GEAREDUCER FAN SHAFT 1 1/2" 5/8" MIN 1 3/8" TAPERED SIDE OF KEY Figure 2 36 and 38 Geareducer 3–Raise the hub assembly above the fan shaft for installation. Slowly lower the assembly onto the shaft with the keyways aligned. Make certain the key does not slide down during installation. Stake the key in the keyway with a center punch if necessary.
Fan Hub Installation U1 Split Taper Bushing The U1 split taper bushing provided with the fan installation kit will be either a Type 1 or a Type 2 bushing. A Type 1 bushing will use the fan shaft key provided with the Geareducer. A Type 2 bushing uses an integral key that is shared by the output shaft and the fan hub keyways. To distinguish which type of bushing is provided, refer to Figure 4.
Fan Hub Installation 5–Position the bushing-hub assembly over the Geareducer fan shaft. Carefully align the bushing bore keyway with the previously installed shaft key—or if using a Type 2 split taper bushing, align the shared hub/bushing key with the fan shaft keyway. Lower the assembly onto the shaft. The assembly must slide onto the output shaft enough to ensure the shaft key runs the entire length of the bushing bore.
Fan Blade Installation Marley HP7000 fan blades are manufactured to equal moment weight and blade clamps to equal static weight. The blades and clamps can be installed in any position without affecting fan balance. Note At the end of the blade shank on a nameplate is inscribed a letter code (i.e. “A” or “B” etc.). When installing or replacing blades use only blades with the same letter code. 1–Lubricate the 3/4″ bolt and 3/4″ hex-nut threads with thread lubricant. Set the hardware aside.
Adjusting Fan Blade Pitch The trial pitch is the calculated setting for design conditions (water rate , heat load, air density, and brake horsepower). The trial pitch is provided (see page 2). 1–Select a position on the fan circumference and rotate each blade to this common location when setting or checking blade pitch. Support the blade tip to maintain a common rotation plane while setting the fan pitch.
Hub Cover Installation Install the hub cover as shown in Figure 1 and Figure 7. Tighten all hex nuts to 15 ft·lbƒ (20 N·m) torque. 145 300 142 142 144 143 146 102 142 141 Figure 7 Fan Maintenance Preventative maintenance will prolong useful life and assure continued trouble-free operation. After the first week and subsequently at six month intervals: • Torque all hardware to specifications referenced in this manual.
Service Proper identification of your fan is necessary to insure you receive correct replacement parts. The Marley cooling tower serial number can be used to determine the fan and any components installed and maintained as original equipment on a Marley cooling tower. The fan diameter and moment weight class from the blade nameplate (see Figure 8) is required to identify blades for replacement.
Motor Load The corrected horsepower should be close to but not exceed the contract horsepower specified by Marley. Determine corrected horsepower using the following equation.
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