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Maintenance
Fan Shaft Bearings
Any good quality lithium or lithium complex base grease,
using mineral oil, conforming to NLGI grade 2 consistency,
and an oil viscosity of 455-1135 SUS at 100°F (100-200 cSt at
40°C) may be used for relubrication.
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.
For safety, stop rotating equipment. Add one half of the
recommended amount shown in
and run for a few minutes. Stop bearing and add the second
half of the recommended amount. A temperature rise,
sometimes 30°F (19°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.
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: Relubrication Intervals
(Use NLGI #2 Lithium or Lithium Complex Grease)
Speed
Temperature
Up to 120°F
100 rpm
(50°C)
Up to 150°F
500 rpm
(65°C)
Up to 210°F
1000 rpm
(100°C)
Over 210°F
1500 rpm
(100°C) to
250°F (120°C)
Up to 150°F
Above 1500 rpm
(65°C)
Over 150°F
Max catalog
(65°C) to 250°F
rating
(120°C)
Above 250°F
(120°C)
108
CAUTION
Table
19. Start bearing,
CAUTION
Cleanliness
Relub. intervals
Clean
6 to 12 months
Clean
2 to 6 months
2 weeks to 2
Clean
months
Clean
Weekly
Dirty/wet
1 week to 1 month
Dirty/wet
Daily to 2 weeks
Contact Browning
Table 18: Recommended Lubricants for Fan Shaft Ball
Bearings
Name
Temperature
Texaco,
30° to 350°F
Premium RB
(34° to 177°C)
40° to 437°F
Mobile, AW2
(40° to 175°C)
Mobile, SHC
68° to 356°F
100
(50° to 180°C)
Chevron,
60° to 450°F
Altiplex
(51° to 232°C)
Synthetic
Exxon, ronex
40° to 300°F
MP
(40° to 149°C)
Note: Temperature ranges over 225°F are shown for lubricants only. High
temperature applications are not suitable for standard air handler
components.
Table 19: Recommended Fan Relubrication Grease Charge
Shaft Size (in)
OZ.
1/2 to 3/4
0.03
7/8 to 1-3/16
0.10
1-1/4 to 1-1/2
0.15
1-11/16 to 1-15/
0.20
16
2 to 2-7/16
0.30
2-1/2 to 2-15/16
0.50
3 to 3-7/16
0.85
3-1/2 to 4
1.50
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)
Check area - Clean and organize bearing installation area
1
and keep well lit. Be sure mounting surfaces are clean
and flat.
Check shaft - Shaft should be within tolerance range
2
shown in
Table
20, clean, and free of nicks and burrs.
Mount bearing on unused section of shafting or repair/
replace shafting as required.
Table 20: Shaft Size Tolerances
Shaft Size (in)
1-11/16 to 2-7/16
2-7/16 and up
Install unit - Slide unit onto shaft. If it is difficult to
3
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.
Fasten unit in place - Install housing mounting bolts,
4
check and align bearing and tighten mounting bolts to
recommended fastener torques. Exercising extreme
caution and safety, rotate shaft slowly to center bearing.
NLGI
Base
Thickener
grade
Parafinic
Lithium
mineral oil
Mineral oil
Lithium
Synthetic
Lithium
Synthetic
Lithium
Mineral oil
Lithium
Shaft Size
Grams
20 mm
0.85
25-30 mm
2.84
35-40 mm
4.25
45-50 mm
5.67
55-60 mm
8.51
65-70 mm
15.59
75-80 mm
24.10
85-105 mm
42.53
Tolerance
+0 to -0.0015
+0 to -0.002
McQuay IM 987
2
2
2
2
2
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