Grain Systems PNEG-119 - Manual (Page 17)

PNEG-119 Inline Centrifugal Fan 17
7. Fan Service
Motors used in fan units are all standard NEMA frame motors and are specially designed for use in crop
drying applications. Replacement parts for these motors are handled by authorized service stations of the
various motor manufacturers.
1. Always disconnect and lock out power before working on or around fan motor and
electrical components.
2. Malfunctioning electrical components should be checked by a qualified electrician.
3. For extra motor life, any electric motor should be run for 30 minutes, once a month. This will help
eliminate any damaging moisture build-up in the motor and bearings.
4. Fans setting idle in the summer offer an excellent place for mud dobbers to build their nests. A mud
dobber nest on the back of the fan blade will cause the fan to be out of balance and vibrate.
This is a ball bearing motor. The bearings have been given initial lubrication at the factory. Motors without
regressing capability are factory lubricated for normal bearing life.
Relubrication Intervals (Motors with Regressing Capability)
New motors having been in storage for over a year should be relubricated by the procedure noted in the
chart to ensure long operating life.
Lubricant
Baldor motors are pre-greased normally with Shell Oil Company’s “Dolium R”. Several equivalent
greases which are compatible with the Baldor furnished grease are Chevron Oil’s “SRI No. 2” and
Texaco Inc.’s “Premium RB”.
Lubrication
Procedure
Overgreasing bearings can cause premature bearing failure. If motor is equipped with alemite fitting, clean
tip of fitting and apply grease gun. Use 1 to 2 full strokes on motors in NEMA 215 frame and smaller.
Use 2 to 3 strokes on NEMA 254 through NEMA 365 frame. Use 3 to 4 strokes on NEMA 404 frames and
larger. On motors having drain plugs, remove grease drain plug and operate motor for 20 minutes before
replacing drain plug.
On motors equipped with slotted head grease screw, remove screw and apply grease tube to hole.
Insert 2" to 3" length of grease string into each hole on motors in NEMA 215 frame and smaller.
Insert 3" to 5" length on larger motors. Motors having grease drain plugs, remove plug and operate motor
for 20 minutes before replacing drain plug. Keep grease clean. Lubricate motors at standstill. Remove
and replace drain plugs at standstill. Do not mix petroleum grease and silicone grease in
motor bearings.
Hours of Service per Year
Suggested Relubrication Interval
NEMA Frame Size
42 to 215T 254 to 326T 364 to 447T
5000 Hrs 5 Years 3 Years 1 Year
Continuous normal application 2 Years 1 Year 9 Months
Seasonal service motor is idle for 6 months or more
1 Year (Beginning
of Season)
1 Year (Beginning
of Season)
1 Year (Beginning
of Season)
Continuous high ambients, dirty or moist locations, high
vibration or where shaft end is hot (pumps-fans)
6 Months 6 Months 6 Months