TM
Model 4900M0290-01
Rev. 8/19 6-19
Lubrication and Maintenance
FERTILIZER FLOW SENSOR CLEANOUT
Fertilizer can salt out when certain conditions of time and temperature are met. This causes a buildup of fertilizer
granules in and around ares of low flow. This will cause errors in the performance of the fertilizer flow switches.
Refer to the photo below for an example of a clean sensor and a dirty sensor.
Follow these instructions to direct the cleanout of the
fertilizer flow switches and return them to optimum
performance. It is recommended that this procedure be
followed at the end of each season.
1. Remove the hose from the supply side of the flow
sensor (labeled “IN” on the housing) by pushing in
the retaining ring while pulling on the hose.
2. Remove the ¼" NPT adapter from the sensor
housing.
3. Remove the stop screw from the opposite side of
the housing.
NOTE: The spring may be stuck onto the screw.
Do not pull on spring.
Clean Dirty
¼" NPT Adapter
(Inlet Side)
Stop Screw
Torque to 20 in-lb
(2.26 Nm)
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