Fan Shaft Sleeve Bearings - (4ʼ Wide Ls Units Only); Fan Belt Adjustment - EVAPCO ATC-E Operation And Maintenance Instruction

Operation and Maintenance Instructions
Unit Description
Induced Draft Units:
3ʼ, 4ʼ, 8ʼ, 8.5ʼ, 17ʼ wide
Induced Draft Units:
10ʼ, 12ʼ, 14ʼ, 24ʼ, 28ʼ wide
Forced Draft Units
Fan Shaft Sleeve Bearings – (4' wide LS units only)
Lubricate the intermediate sleeve bearing(s) before unit start up. The reservoir should be checked several times during the first
week to ensure that the oil reserve is brought to full capacity. After the first week of operation, lubricate the bearing(s) every 1,000
hours of operation or every three months (whichever occurs first). High temperatures or poor environmental conditions may
necessitate more frequent lubrication. The oil reservoir consists of a large felt packed cavity within the bearing housing. It is not
necessary to maintain the oil level within the filler cup.
Use one of the following industrial grade, non-detergent mineral oils. Do not use a detergent based oil or oils designated heavy
duty or compounded. Different oils may be required when operating at temperatures below 30°F continuously. Table 2 provides a
short list of approved lubricants for each temperature range. Most automotive oils are detergent based and may not be used.
Detergent oils will remove the graphite in the bearing sleeve and cause bearing failure.
Ambient Temp
30°F to 100°F
-25°F to 30°F
All bearings used on EVAPCO equipment are factory adjusted and self aligning. Do not disturb bearing alignment by tightening the
sleeve bearing caps.
Oil drippage may result from over-oiling or from using too light of an oil. Should this condition persist with correct oiling, it is
recommended that a heavier weight oil be used.

Fan Belt Adjustment

The fan belt tension should be checked at start up and again after the first 24 hours of operation to correct for any initial stretch. To
properly adjust the belt tension, position the fan motor so that the fan belt will deflect approximately 3/8" when moderate pressure
is applied midway between the sheaves. Figure 1 and Figure 2 show two ways to measure this deflection. Belt tension should be
checked on a monthly basis. A properly tensioned belt will not "chirp" or "squeal" when the fan motor is started.
Figure 1 – Method 1
Table 1 – Location of Grease Lube Line Fittings for Belt Driven Units
Texaco
Regal R&O 220
Capella WF 32
Table 2 – Sleeve Bearing Lubricants
Location of Lube Line Fittings
Located just beside the fan casing
access door
Located inside the fan casing
access door
Located on the bearing support or
on the side of the unit
Mobil Exxon
DTE Oil BB Teresstic 220
DTE Heavy ------------------
Figure 2 – Method 2
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