Great Plains NP30A 30-foot Operator Manual - Manual (Page 123)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 119
2014-05-20 Table of Contents Index 407-502M
Metering System Maintenance
Fully discharge system before performing any
maintenance. See “System Discharge” on page 110.
If any system components are removed from plumbing,
when replacing or re-installing them, use only a pipe
sealant specified for use with anhydrous ammonia, such
as RectorSeal #5.
Strainer Maintenance
Clean magnets every 4 to 5 tank loads. Check strainer
screen at that time.
Ceramic magnets scavenge ferrous metal debris from
the flow, preventing this material from contaminating the
magnets in the flow meter
.
The 20 mesh screen filters out non-magnetic particles
that could interfere with both accurate flow metering and
flow control. If the screen cannot be cleaned, or is
damaged, the replacement is Raven part number
339-9000-032.
Cooler Maintenance
Manual 016-0159-403, the Raven AccuFlow™ Operator
manual, has specific recommendations for seasonal
cooler storage, cleaning, and preserving the interior of
the supercooler.
Cooler Hydrostatic Relief Valve
This is a limited life part (page 117). Check for expiration
whenever servicing the cooler.
Flow Meter Maintenance
If flow meter readings are irregular, or consistently low
relative to the amount of NH
3
known to have flowed from
the tanks, remove the meter for cleaning and inspection.
Refer to 016-0159-403, the Raven AccuFlow™ Operator
manual, for details.
Control Valve Maintenance
On/Off Valve Maintenance
Flow Divider Maintenance
Suffocation, Blinding, Burning, Freezing, Disabling and
Disfigurement Hazards:
Do not perform maintenance with anhydrous ammonia in the
system. Fully discharge the system of NH
3
liquid and vapor
before working on the applicator.
Tank Failure Early Warning:
An excessive build-up on the magnets suggests that or more
more nurse tanks, employed since the most recent magnet
cleaning, is/are deteriorating internally. Notify the tank cart
provider. If you own the tanks used, take steps to identify the
failing tank.
A19
A25
Equipment Damage Risk:
Periodic cleaning is essential if NH
3
additives have been used,
such as Dow Chemical N-Serve or Amoco ACA.
A21
A23
A25
A30
A30
A31