Greenheck Fan BDF Troubleshooting, Recommended Relubrication Frequency in Months, Problem, Cause

4.Once installed, adjust belts as shown in “Pre‑Starting Checks.”

5.Shaft bearings can be classified in two groups: relubricating and non-relubricating. Bearings on sizes 80 through 180 are factory lubricated and require no further lubrication under normal use (between -20°F and 180°F in a relatively clean environment). Bearings on size 200 are relubricatable. These bearings will require frequent lubrication. Caution should be employed to prevent overpacking or contamination.

Table 1: Suggested Fan Bearing Greasing Intervals

Interval (months)	Type of Service
	Heavy duty in dirty, dusty locations;
1 to 3	high ambient temperatures; moisture
	laden atmosphere; vibration.
3 to 6	12 to 24 hours per day, heavy duty,
	or if moisture is present
6 to 12	8 to 16 hours per day in clean,
	relatively dry atmosphere
12 to 18	Infrequent operation or light duty in
	clean atmosphere

6.Grease fittings should be wiped clean. The unit should be in operation while lubricating. Extreme care should be used around moving parts.

7.Grease should be pumped in very slowly until a slight bead forms around the seal. A high grade lithium base grease should be used.

Recommended Relubrication Frequency in Months

NOTE: If unusual environment conditions exist (extreme temperature, moisture or contaminants) more frequent lubrication is required.

A good quality lithium base grease, conforming to NLGI Grade 2 consistency, such as those listed here may be used.

Table 2: Grease Manufacturers

Manufacturer	Grease (NLGI #2)
U.S. Electric Motors	Grease No. 83343
Chevron U.S.A. Inc	Chevron SRI Grease #2
Mobil Oil Corporation	Mobilith
	Mobil 532
Texaco, Inc.	Premium BRB #2
	Texaco Multifak #2
Amoco Oil Co.	Rykon Premium #2
Exxon	Unirex N2
Shell	B Shell Alvania #2

Troubleshooting

WARNING: Before taking any corrective action, make certain unit is not capable of operation during repairs.

PROBLEM	CAUSE	CORRECTIVE ACTION
	Wheel unbalance	Clean all dirt off wheel. Check wheel balance, rebalance in place if
		necessary.
	Bad bearings	Replace.
Excessive noise	Belts too tight or too loose	Adjust tension, see figure 7.
or vibration	Wheel improperly aligned and	Center wheel on inlet.
	rubbing
	Loose drive or motor pulleys	Align and tighten. See “Pre-Starting Checks”, see page 4-5.
	Foreign objects in wheel or housing	Remove objects, check for damage or unbalance.
	System resistance too high	Check system: Proper operation of backdraft or control dampers,
		obstruction in ductwork, clean dirty filters.
Reduced airflow	Unit running backwards	Correct as shown in figure 4.
	Excessive dirt buildup on wheels	Clean wheel.
	Improper wheel alignment	Center wheel on inlets. See “Pre-Starting Checks”, see page 4-5.

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Model BDF • Belt Drive Duct Fan

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