46 McQuay IM 937
System Maintenance
Fan Shaft Bearings
Compatibility of grease is critical. Relubricatable Browning
bearings are supplied with grease fittings or zerks for ease of
lubrication with hand or automatic grease guns. Always wipe
the fitting and grease nozzle clean.
Note: Temperature ranges over 140°F are shown for lubricants only.
Maximum unit temperature is 140°F.
Bearing Replacement
The following instructions must be read in entirety before
attempting installation or removal. The procedures indicated
should be carefully followed. Failure to do so can result in
improper installation which could cause bearing performance
problems as well as serious personal injury.
Bearings in bolt-on housings (units)
1 Check area - Clean and organize bearing installation area
and keep well lit. Be sure mounting surfaces are clean and
flat.
2 Check shaft - Shaft should be within tolerance range shown
in Table 20, clean, and free of nicks and burrs. Mount
bearing on unused section of shafting or repair/replace
shafting as required.
3 Install unit - Slide unit onto shaft. If it is difficult to mount
bearing on shaft, use a piece of emery cloth to reduce any
high spots on shaft. Do not hammer on any component of
the bearing.
4 Fasten unit in place - Install housing mounting bolts, check
and align bearing and tighten mounting bolts to
recommended fastener torques. Exercising extreme caution
and safety, rotate shaft slowly to center bearing.
CAUTION
For safety, stop rotating equipment. Add one half of the
recommended amount shown in Table 19. Start bearing,
and run for a few minutes. Stop bearing and add the second
half of the recommended amount. A temperature rise,
sometimes 30°F (1°C), after relubrication is normal. Bearing
should operate at temperature less than 200°F (94°C) and
should not exceed 225°F (107°C) for intermittent operation.
For a relubrication schedule, see Table 17. For any
applications that are not in the ranges of the table, contact
McQuay.
CAUTION
The tables below state general lubrication
recommendations based on our experience and are
intended as suggested or starting points only. For best
results, specific applications should be monitored regularly
and lubrication intervals and amounts adjusted accordingly.
Table 17: SAF and RAF Relubrication Intervals
(Use NLGI #2 Lithium or Lithium Complex Grease)
Speed Temperature Cleanliness Relub. intervals
100 rpm Up to
120°F
(50°C)
Clean 6 to 12 months
500 rpm Up to
150°F
(65°C)
Clean 2 to 6 months
1000 rpm Up to
210°F
(100°C)
Clean 2 weeks to 2
months
1500 rpm Over
210°F
(100°C) to
250°F (120°C)
Clean Weekly
Above 1500 rpm Up to
150°F
(65°C)
Dirty/wet 1 seek to 1 month
Max catalog rating Over
150°F
(65°C) to 250°F
(120°C)
Dirty/wet Daily to 2 weeks
Above
250°F
(120°C)
Contact Browning
Table 18: Recommended Lubricants for Fan Shaft Ball
Bearings
Name Temperature Base Thickener
NLGI
grade
Texaco,
Premium RB
30°
to
350°F
(34° to 177°C)
Parafinic
mineral oil
Lithium 2
Mobile, AW2
40°
to
437°F
(40° to 175°C)
Mineral oil Lithium 2
Mobile, SHC
100
68°
to
356°F
(50° to 180°C)
Synthetic Lithium 2
Chevron,
Altiplex
Synthetic
60°
to
450°F
(51° to 232°C)
Synthetic Lithium 2
Exxon, ronex
MP
40°
to
300°F
(40° to 149°C)
Mineral oil Lithium 2
Table 19: Recommended SAF and RAF Relubrication
Grease Charge
Shaft Size (in) OZ. Shaft Size Grams
1/2 to 3/4 0.03 20 mm 0.85
7/8 to 1-3/16 0.10 25-30 mm 2.84
1-1/4 to 1-1/2 0.15 35-40 mm 4.25
1-11/16 to 1-15/16 0.20 45-50 mm 5.67
2 to 2-7/16 0.30 55-60 mm 8.51
2-1/2 to 2-15/16 0.50 65-70 mm 15.59
3 to 3-7/16 0.85 75-80 mm 24.10
3-1/2 to 4 1.50 85-105 mm 42.53
Table 20: Shaft Size Tolerances
Shaft Size (in) Tolerance
1-11/16 to 2-7/16 +0 to -0.0015
2-7/16 and up +0 to -0.002
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