Grain Systems PNEG-163-08 - Manual (Page 28)

6. User Servicing Instructions and Troubleshooting
28 PNEG-163-08 Centrifugal Fan
Installation
1. Carefully clean motor shaft, key, bushing and bore of wheel. MAKE SURE MAIN POWER IS
LOCKED OUT and that shaft and key are completely free of rust and burrs. DO NOT lubricate
the bushing or cap screws. CHECK AND MAKE SURE ALL MOTOR MOUNT BOLTS ARE
PROPERLY TIGHTENED. Before installing the wheel, check the following:
a. All foreign material should be removed from the wheel.
b. Carefully inspect the wheel weldment and hub casting for damage, cracks, or other defects.
Contact the factory if there is any question regarding the structural integrity of the wheel.
2. Slide wheel over motor shaft and locate it as far onto the motor shaft as possible.
3. Align the keyway in the bushing with the key and SLIDE bushing onto motor shaft. Do not attempt to
drive the bushing onto the shaft, as it may damage the motor bearings.
4. Rotate the bushing and wheel so their key slots are in line and loosely attach the wheel to the
bushing. MAKE SURE THE CAP SCREWS ARE INSERTED INTO THE UNTHREADED
CLEARANCE HOLES IN THE BUSHING. Refer to previous CAUTION note
on Page 27 . Locate the
bushing so it is approximately flush with the end of motor shaft. Make certain that the proper cap
screws are used for reassembly and no damage has occurred to these screws during disassembly.
Use only the special type bolts supplied with the original wheel.
5. Install inlet cone, checking clearance between fan wheel and inlet cone. Shift the location of inlet
cone as required to center it in relation to the fan wheel, providing equal clearance completely around
the fan wheel. Tighten inlet cone bolts.
6. Slide the wheel forward onto the taper-lock bushing and turn the cap screws in by hand as far
as possible.
NOTE: The bushing must be located far enough forward so the wheel weldment does not strike cone
as it rotates. Blade will move toward cone as it is tightened.
7. Use an INCH-POUNDS torque wrench and GRADUALLY TIGHTEN the three (3) cap screws
(1/4 turn at a time) until the taper bushing becomes fully seated. Refer to the chart on Page 29
for recommended cap screw tightening torques. DO NOT EXCESSIVELY OVERTIGHTEN
THE BUSHING.
8. Turn wheel by hand and check it for freedom of rotation and uniform clearance around inlet cone
before reinstalling the fan guard.
Fan Wheel Inspection and Maintenance
Pre-season inspections should be done on the fan wheel to look for the following.
1. Any debris (stalks, bees wings, mud, insects and insect nests) accumulated on the surfaces of
the fan wheel. Remove these items as they will likely disrupt airflow over the fan airfoils and can
potentially cause vibration problems.
2. Inspect the fan wheel for any broken, cracked, or loose parts. Blade should NOT be operated with
broken or loose parts. Contact dealer for determination of the repairs required.
WARNING
Do not attempt to pull the flange of the bushing flush with the wheel hub.
A clearance of 1/8" to 1/4" must be maintained between bushing flange and
wheel hub surface. Wheel will loosen and cause damage or injury.