Acme Engineering and Manufacturing Corporation
Form 611105
March 2014
P.O. Box 978, Muskogee, OK 74402
Telephone 918/682-7791 Fax 918/682-0134
[email protected]
www.acmehort.com [email protected]
Preventive Maintenance Guide and Tips for Best Performance
Axial Fans for Agriculture or Greenhouse Applications
Thank you for purchasing Acme Ventilation products. Acme Fans
are designed for top performance for its application range. Many
factors could contribute to loss of performance through the life of
this product. This document covers recommended maintenance
intervals and tips to keep your Acme product performing at its
best. It is our goal to insure that your fan performs at its high
capacity and gives you years of satisfied service.
NOTE: All service work must be performed only after the
power has been disconnected from the fan. At no time
should you attempt to work on or adjust the fan while guards
or shutters are removed and the fan is running or the prop is
moving. By attempting to service a fan in operation, you are
risking the safety of yourself and others around you. During
fan service and cleaning, always wear gloves to protect your
hands from possible sharp edges.
1. Cleaning your Acme fans – For best performance your
Acme fans need to be cleaned regularly. Cleaning 4 times a
year will help insure best possible airflow (more frequently if
used in a dirty environment).
a. Fan Motor – It is recommended that dust accumulation
on the fan motor be brushed away with a stiff bristle
brush, then a light coat of Simple Green spray cleaner
applied, allowing to soak for 30 seconds, and wiping away
cleaning residue with a clean dry cloth. If needed, repeat
this process. A clean motor will dissipate heat more
effectively than a dirty motor, therefore lasting longer. At
the same time, insure that the motor is mounted securely
and motor bolts are tight. (NEVER use a high pressure
washer on electrical devices including Totally Sealed
b. Bearings/Bearing Housing – It is recommended that
the bearings housing and fan shaft NEVER be pressure
washed or premature bearing failure may be induced.
The soiled bearing housing should be brushed clean
with a stiff bristle brush, then a light coat of Simple Green
spray cleaner applied, allowing to soak for 30 seconds,
and wiping away cleaning residue with a clean dry cloth.
At this time, check to make sure all bolts in the bearing
housing is secure.
c. Propeller/ Housing/ Cone - The prop, cone, and fan
housing should have all caked dust and dirt brushed free
and a light coat of Simple Green cleaner applied. Then
rinsed with a lower pressure water spray, avoiding any
overspray onto the motor or bearings. Make sure that all
drain holes are free and clear of debris to insure proper
drainage of water.
d. Shutter/Damper Blades – Care should be taken to avoid
bending or damaging shutter blades during cleaning.
A soft bristle brush and cloth should be used to clean
dirt and dust from the shutter blades so that the shutter
opens and closes freely. Shutters should NEVER be
cleaned using a high pressure washer since damage will
likely be induced.
e. During the cleaning cycle is a good time to check for any
loose fasteners, if found retighten at this time.
f. After cleaning and washdown, let the fans run for 3-4
hours to properly dry.
2. Belt Tensioner Maintenance and Inspection
a. After the first 8-10 hours of operation check the belt for
proper alignment and tension and recheck all the bolts for
proper torque. Repeat this every 500 hours or 3 months.
Insure that your belt tensioner is set correctly by following
the instructions located in the Acme supplied installation
and maintenance guide that came with your fan.
b. Most of the rotary belt tensioners used on Acme fans have
a grease zerk to lubricate the springs in the tensioner
arm. It is suggested that this zerk be greased 4 times a
year. (Note grease zerk in photo)
c. Grease type - Lubrimatic White Lithium Grease part
number 11354 or equivalent white lithium grease meeting
ISO 6743/9:1987 standard.
d. Grease volume – It is recommended that 1 gram (+/10%) of grease be applied at each maintenance interval.
e. Grease gun – the standard grease gun producing no
more than 6000 psi is recommended for this application.
Most dispense an average of .75 grams to 1.25 grams
per stroke, but it is up to the consumer to determine the
volume/stroke of the grease gun you prefer and lubricate
f. Idler pulley – During the maintenance cycle, you should
also inspect the idler pulley for cracks, unusual wear in
the V groove area, and bearing play. If any issues are
found a replacement kit (Acme part # 993485) can be
purchased from your local Acme Fan distributor. The Belt
Tensioner assembly should NEVER be cleaned using a
high pressure washing system.
g. Tensioner Adjustment – As belts are a normal wear
item, periodic replacement of belts will be required.
Readjustment of the belt tensioner will be required during
this process. When resetting the proper tension please
adjust the tensioner arm so that the base mark lines
up with the 2nd adjustment mark on the tensioner arm
as shown in the photo below.(Note: Depending on fan
model, your base mark my line up on the opposite side
of the grease zerk) After adjustment of tensioner arm and
replacement of belt, check to make sure that the arm is
freely moving and not binding. Over tightening of the
tensioner arm can cause binding.
3. Belt Inspection
a. Since tension in ” V” belts will drop after the initial runin and seating process, failure to check and retension
the belt will result in low belt tension and belt slippage.
This slippage will result in premature belt failure and
sheave damage. This slippage translates to a loss of
fan performance and lower efficiency.
b. Observing signs of unusual belt wear of damage will
help troubleshoot possible drive problems. Mark
or note a point on the belt, while wearing gloves,
work your hands around the belt feeling or visually
inspecting for any problems.
c. Check for cracks, frayed spots, cuts, or unusual wear
patterns. If any of these are found, the belt should be
replaced immediately.
d. Check the “Ride Height” of the belt in the sheave
groove as shown in the picture below. A worn belt
riding low in the sheave groove is the equivalent to
running a smaller drive pulley and reducing your fan
performance. As loss of cfm will result when using
significantly worn belts.
b. Sheave Inspection – one of the greatest detriments
to long-term fan performance is belt slippage due to
worn belts and/or worn sheaves. This can account for
as much as a 50% loss in fan performance.
i. Wear gloves while inspecting sheaves to protect
from sharp edges. Inspect grooves for wear and
nicks. Use a Gates sheave gauge (Gates part
number 7401-0014) to determine if the V grooves
are worn. Place the proper sheave gauge in the V
groove and check for wear. A light source such as
a flashlight can be used to backlight the gauge.
If more than 1/32” of wear can be seen between
the sheave wall and gauge, the sheaves are
worn and should be replaced.
Don’t be mislead by shiny grooves, this is often
an indication that the sheaves are polished due
to heavy wear. Inspect the sheave grooves for
rust or pitting, if found the sheaves should be
4. Sheave Alignment and Inspection – during the routine
belt inspection is a good time to check for proper sheave
a. Alignment – There are 2 possible causes for sheave
misalignment. See diagram
i. Parallel misalignment – Sheaves are not
properly located on the shafts. CORRECTIVE
ACTION: Loosen and reposition one or both
sheaves until properly realigned.
ii. Angular misalignment – The motor shaft
and driven machine shaft is not parallel.
CORRECTIVE ACTION: Correct alignment
adjusting the motor shaft into alignment with the
driven shaft.
5. Sheave adjustment – On belt drive models equipped
with adjustable pitch motor pulleys, the pitch setting made
at the factory operates the fan the maximum safe speed
and load for the motor. Do not close the motor pulley
to increase fan speed as this will overload the motor
causing damage to the motor or thermal overload switch.
The sheave may be opened reducing the fan speed and
decreasing cfm output. If further information is required
contact your nearest Acme Engineering representative.
March 2014
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