Models 947, 948 and 960 Leak Detectors Operations and Service Manual
B-27
B.5.2.1.2 Removing the Nitrogen Purge Connection from Pump
NOTE
An electrician or electrical technician is required for
proper removal and installation.
If only maintenance is being performed, the pump can be removed with the valve attached.
To perform this procedure:
1.
Dry System Forepump only:
Remove the forepump.
2. Disconnect AC power.
3. Disconnect the VPI valve at the pump and valve block connector.
B.5.2.1.3 Removing the Exhaust Fitting
To perform this procedure:
1. Remove the NW16 clamp from the exhaust manifold.
2. Remove the centering ring and O-ring, and place them on a clean surface.
B.5.2.1.4 Removing the Pump from the Cabinet
To perform this procedure:
1. Working from beneath the main cabinet, remove the four nuts from the mounting bolts
that connect the pump to the bottom of the main cabinet (Figure B-10 on page B-15).
NOTE
You may have to loosen the radiator clamps on the
tygon tubing and slide it up the line to remove the
pump.
2. Remove the pump from the 947/948/960.
B.5.2.2 Replacing the Dry System Forepump
Before you replace the turbo pump, examine and clean all O-rings centering rings, clamps
and the manifold.
B.5.2.2.1 Examining and Cleaning Centering Rings, O-rings and Manifold
Refer to “Examining and Cleaning Centering Rings, O-rings and Manifold” on page B-12.
Execute steps 1 through 4.
