108
McQuay IM 987
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.
Note:
Temperature ranges over 225°F are shown for lubricants only. High
temperature applications are not suitable for standard air handler
components.
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 (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.
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: 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 week 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 Fan 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
