Marley M1712, M1713, M1712.5 User Manual
user manual
Geareducer® model M1712 – M1712.5 – M1713
INSTALLATION - OPERATION - MAINTENANCE
Z1051231 ISSUED 04/2017
READ AND UNDERSTAND THIS MANUAL PRIOR TO OPERATING OR SERVICING THIS PRODUCT.
fan hub installation
RETENTION
RETENTION
BOLT
The following instructions detail the process for installing a fan
on a Marley Geareducer with a straight fan shaft using a split
taper bushing or a tapered fan shaft utilizing a bolted fan hub
retention plate.
1. Remove the retention plate and hardware from the top of the
Geareducer shaft. Thoroughly clean the fan shaft, fan shaft
key, and the fan hub center bore to remove any debris and/or
protective coatings. After cleaning, apply a coat of anti-seize
compound to the top 7" (180mm) of the fan shaft.
2. Prior to hub installation, fully seat the key in the fan shaft
keyway. The key is a tight fit across the width and must never
be altered.
3. Raise the fan hub above the fan shaft for installation. Slowly
lower the hub onto the shaft with the keyways properly aligned.
Make certain the key does not slide down during installation.
Stake the key in the keyway with a center punch if necessary.
The fan shaft key should be approximately centered in the
engaged portion of the hub when engaged on the shaft. Verify
the center hub is fully seated by visual inspection.
4. Figure 1 illustrates proper retention plate and hardware installation. The retention plate is designed to allow clearance for
the fan shaft key, and when properly installed will not extend
over or interfere with the key in any way. Torque the retention
bolts to 70 ft·lbƒ (95 N·m).
PLATE
Figure 1 Retention Plate Assembly
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operation and service
Corrosion and Dry Start-Up Protection
Marley Geareducers utilize iron and steel materials, which if not
maintained correctly, may degrade. While some external corrosion is acceptable, an internal lubrication film must be maintained at all times to protect the working components against
corrosion and potential startup damage. The following information describes methods of operation and preventive measures
to ensure suitability for long-term operation.
Status Definitions
Pre-Commission
Duration* = Up to 4 months after receipt.
* export shipment status duration is reduced by 1 month
This is the as-shipped condition, which contains a factory rust-
proofing coating on the interior of the unit as well as a grease
coating on the exposed shaft surfaces.
If the cooling tower is not ready for operation at the time of
status expiration, steps must be taken to place the Geareducer
into Long-Term Storage or Downtime status.
Operational
This stage is initiated upon the first motor driven sequence. The
Geareducer is now considered as being placed into regular
service and operation.
Idle
Duration = 2 to 4 weeks.
This stage is a suspension in operational status and lasts up
to two 2 weeks. The duration may be doubled by completing
a Run Cycle.
It is not recommended to extend the idle status more than once
in any given sequence.
A common application is during a temporary outage
Seasonal Shutdown
Duration = Up to 4 months after operational is suspended.
This stage may be considered an extended idle condition.
Requires additional preventive maintenance.
Long-Term Storage or Downtime
Duration = Indefinite.
Requires long-term preventive measures.
Run Cycle
Defined as full speed operation for a minimum of 30 minutes.
This recoats all internal components and surfaces with lubricant and also helps to expel some moisture that may have
accumulated from daily ambient condition cycling.
As shipped, a Marley Geareducer is protected internally against
corrosion with machine enamel on un-machined parts and with
rust-proofing oil and grease on machined surfaces. These coatings
normally protect the Geareducer against corrosion for the duration
of the Pre-Commission phase. Adding normal lubricant to the
unit will dissolve the rust-proofing oil in the Geareducer sump.
Provided it is added via the filler-neck or pumped in through the
drain connection, this lubricant will not reduce the overall level
of protection however, if the unit is operated for any amount of
time, the Pre-Commission period is depleted and the unit is now
considered to be in Operational status.
Check the Geareducer exterior yearly. Touch up with paint as
required. Exposed pipe threads are coated to prevent corrosion.
Touch up coating as required.
Initial Operation
Priming
Due to lack of control over facility operational readiness, site
ambient conditions or storage practices, etc., it is recommended
to supplement lubricant prior to initial operation. The same fill lubricant should be poured or pumped into the port above the interstage
shaft. Remove pipe plug in center of Interstage Bearing Cap to
expose port. Refer to Figure 3. If additional oil is being used, an
amount of 1 to 1.5 quarts should be used. If the lubricant is being
pumped from the sump bulk volume, at least 1 quart should be
transferred. In either case, this priming step should be performed
within 5 days of initial operation. If a delay occurs and the 5 day
duration is exceeded, repeat the process. In either case, this priming
step should be performed while rotating the gear train by hand
and within 5 days of initial operation.
Warning – Operating the Geareducer at an oil level other than
between the Add and Full levels may damage the unit and possibly
mating equipment. This could also escalate to a safety concern
for nearby personnel.
The Geareducer must be filled with oil to the Full oil level mark on
the Geareducer case before it is placed in operation. If the unit
is being taken out of Long-Term Storage or Downtime, the oil
should be drained down to the Full operating level. If drain-down
occurs within 5 days of the initial startup, the above priming sequence may be skipped. See Service and Lubrication section
for oil filling instructions.
Geareducers supplied with new cooling towers include oil for the
initial filling and in some cases, will also ship with an additional
amount required to place the unit into Long-Term Storage or
Downtime status. Normally, oil is not furnished with Geareducers
supplied as a spare or on replacement orders. Before operating
the mechanical equipment, check to be sure the oil level is at the
Full mark at the Geareducer and that the external gauge placard
Full mark corresponds with the Full level in the Geareducer. Check
oil lines to be sure there are no leaks.
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