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Preset Valve Trouble Shooting
PROBLEM: The valve will not close completely.
A) The shaft of the piston may be bent from excessive force.
B) Debris may be located between the piston and piston guide.
C) The upper or lower seals may be worn, swollen from incompatibility or cut from debris.
D) The mechanical linkage to the Veeder-Root 7889 preset counter may be tight. The linkage must be loose for the
preset to operate correctly.
E) The Veeder-Root preset may have a worn or bent trip mechanism that is not allowing the preset to function.
PROBLEM: The valve shuts immediately upon first stage trip, bypassing the second stage closure.
A) The mechanical linkage might need to be adjusted, moving the Nylon locking nuts forward or backwards to change
the closing of the preset valve.
B) The Veeder-Root preset may need to be "raked" or adjusted for the correct shut-off volume. See Veeder Root 7889
preset service manual for further instructions.
C) The Veeder-Root preset may have a worn or bent trip mechanism that is not allowing the preset to function.
PROBLEM: The preset batch over or under registers correct volume.
A) The mechanical linkage might need to be adjusted, moving the Nylon locking nuts forward or backwards to change
the closing of the preset valve.
B) The Veeder-Root preset may need to be "raked" or adjusted for the correct shut-off volume. See Veeder Root 7889
preset service manual for further instructions.
C) The Veeder-Root preset may have a worn or bent trip mechanism that is not allowing the preset to function.
760 Air/Vapor Check Valve Trouble
PROBLEM: Product will not be pumped through the meter.
A) Pressure has increased behind the air check piston and will not open the valve. One of the valve plates on the air
eliminator outlet must be installed so that the round tab is located to the top of the device. This allows the minimum
bleed function on the valve plate to work properly. Ensure that the air check side outlet is connected to the air
eliminator outlet cove where the plate with the round tab is toward the top. This will allow for the proper release of
pressure from the air check.
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TCS900003, Rev.6
04/26/2016
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Table of Contents
Troubleshooting
