Grain Systems PNEG-1702 - Manual (Page 85)

11. Service
PNEG-1702 ETL Listed GSI/FFI Portable Dryer Manual 85
Fan Blade Removal and Installation
When working on or around the fan blade, be aware that it may free wheel and could cause serious injury.
It may be helpful to gently wedge the propeller to prevent this from occurring. However, remember to
remove the wedge before restarting the fan.
If at any stage the blade has become damaged, it is important that it is repaired and that the
blade is balanced. Failure to do this could result in the blade running out of balance and potentially
exploding. Balancing the blade is a specialists job, if in doubt contact GSI or the dealer.
The fan blade is secured to the motor shaft by the use of a taper-lock bushing, motor shaft key and
three (3) cap screws.
When reassembling parts, the cap screws must be installed through the untapped clearance holes as
shown. This will cause the blade to be pulled forward onto the tapered bushing, thus locking the parts
securely onto the motor shaft. When fan servicing requires removal and installation of the blade, make
sure the blade is removed and reinstalled properly.
1. Lock out the fan power supply and remove the fan guard and the venturi, as required on
some models.
2. Remove the three (3) cap screws from the clearance holes in the taper-lock bushing.
3. Install two (2) of the cap screws into the threaded holes in bushing and turn them by hand until they
bottom against the front surface of the blade.
NOTE: The threaded holes within the bushing are provided for disassembly purposes only. Do not
attempt to use these holes for reassembly. They will not allow the parts to lock onto the shaft
thereby causing a hazardous operating condition.
4. Block blade to prevent it from turning and gradually turn the cap screws (up to 1/4 turn at a time) until
the blade breaks loose from the bushing and motor shaft. Carefully remove bushing and blade. With
the blade free from the bushing, a wheel can be used to pull the bushing off of the motor shaft.
Reattach bushing onto blade to prevent the loss of parts.
NOTE: During manufacturing, the blade and bushing are balanced together and are marked with
two (2) small dots to identify their original alignment position. Check the bushing and propeller
to make sure they have alignment marks. Mark the alignment of the propeller and bushing,
if necessary.
CAUTION
Although the taper-lock method of retaining the blade onto the motor shaft is simple,
it is essential that the following points be read carefully and fully understood.
Improper installation can cause a loose flying blade and result in serious injury
or death.