MDE-4334C Atlas Start-up and Service Manual · April 2008
Page 7-29
Meters
Hydraulic/Mechanical Components
• After calibrating a meter, always ensure that it is properly sealed at the calibrating wheel
to avoid tampering.
• After a drive-off, inspect the meter for leaks.
• Non-use of filters and strainers can significantly reduce meter life.
• Abnormally low pressure and flow rate can cause the meter to stall.
• Meter failure may be indicated by a significant change in calibration from high to low
flow rate, excessive calibration spread, or meter stall at low-flow.
Note: Other problems may also cause the same symptoms.
• After replacing a meter, always purge the system of air (see
on
) and recalibrate the unit.
• Calibration problems are not always caused by a bad meter. Meter check valves, leaking
nozzles, binding pulsers, defective pistons, or internally leaking vapor recovery hoses can
also result in calibration problems.
• A top shaft seal kit to prevent leakage at extremely cold temperatures is available.
Repairing CFT Meters
Before Beginning Work
Before beginning the repair, proceed as follows:
1
Read and follow the procedure in
About Servicing Hydraulic Components
on
before
beginning the repair.
2
After following power-down procedures, open the nozzle into an approved container to bleed
pressure. Some residual pressure may remain.
3
Continue with the required meter service procedures.
Removing/Replacing Gasboy CFT Meter
To remove/replace the Gasboy CFT meter, proceed as follows:
1
Disconnect the pulser drive on electronic models, or the computer drive on mechanical models
from the meter output shaft.
2
Support the meter when removing bolts.
3
Remove the discharge line flange and inlet line flange bolts.
4
Remove meter bracket bolts.
5
Remove the meter.
6
Perform necessary service on the meter.
7
Inspect and clean the manifold or inlet and discharge line mounting surfaces.
8
Install new inlet and discharge flange O-Rings.