
Page iv
MDE-4334C Atlas Start-up and Service Manual · April 2008
Purging Pumps and Dispensers (with Fuel in Product Lines) . . . . . . . .7-12
Measuring the Flow Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-14
Measuring Pressure and Vacuum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-15
Using the Pressure Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-15
Pressure Measuring Locations on Unit . . . . . . . . . . . . . . . . . . . . . . . . .7-16
Measuring Pressure Drop for Pumps and Dispensers . . . . . . . . . . . . .7-17
Analyzing Pressure Drop for Dispensers and Pumps . . . . . . . . . . . . . .7-18
Measuring Vacuum for Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-20
About Vacuum Readings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-20
Measuring Dry Vacuum for Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-20
Measuring Wet Vacuum and Pressure for Pump . . . . . . . . . . . . . . . . .7-21
About Calibrating Meters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-23
CFT Meter Calibration Adjustment for Standard, Hi-Flow,
and Super-Hi Models (All Models Excluding 9850K and 9850KX) . . . .7-24
LC Meter Calibration Adjustment for Ultra-Hi Models 9850K
and 9850KX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-26
About Meters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-27
CFT Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-28
Repairing CFT Meters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-29
Replacing Cylinder Cover and Gasket (Cylinder Cover Leaks) . . . . . .7-30
Replacing O-Rings (Body and Cover Leaks) . . . . . . . . . . . . . . . . . . . .7-31
Calibrating Wheel Parts Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-32
Replacing Piston Cups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-32
Removing/Replacing the Shaft Seal and Gasket (Upper Seal Leaks) .7-34
LC Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-35
Removing/Replacing LC Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-36
About Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-37
Servicing Filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-38
About Strainers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-40
Servicing Strainers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-41
About the Hanging Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-42
Hoses and Flow Restrictors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-42
Breakaway Valves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-44
Testing Hose and Hanging Hardware Continuity . . . . . . . . . . . . . . . . .7-47
Internal Hose Retrievers and Clamps . . . . . . . . . . . . . . . . . . . . . . . . . .7-49
GPU Pumping Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-50
Servicing the Strainer Check Valve. . . . . . . . . . . . . . . . . . . . . . . . . . . .7-53
Servicing the Pressure Control Valve (PCV). . . . . . . . . . . . . . . . . . . . .7-55
Servicing the Bypass/Pressure Relief Valve (PRV) . . . . . . . . . . . . . . .7-56
Servicing the Rotor and Shaft Assembly. . . . . . . . . . . . . . . . . . . . . . . .7-58
XU2A Pumping Unit for 9850K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-59
Sump for 9850K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-62
About Electric Motor for Self-contained Pump Units . . . . . . . . . . . . . . .7-63
Belts and Pulleys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-64
Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-65
Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-66
Solenoid Valve and Filter Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-68
Solenoid Valves for 9x40, 9850 and 9x53 with Satellite Outlet Piping .7-70