Models 947, 948 and 960 Leak Detectors Operations and Service Manual
B-21
B.4.2.2 Replacing the Dry System Rough Pump
Before you replace the mechanical pump, examine and clean all O-rings centering rings,
clamps and the manifold.
B.4.2.2.1 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.
B.4.2.2.2 Re-installing the Dry System Rough Pump
WARNING
To avoid injury, use proper lifting techniques when moving
pumps. Your system may have pumps that require two people
to move them safely.
To perform this procedure:
1. Ensure the area is clean for the new pump.
2. Place the new pump in the 947/948/960 oriented as shown in Figure B-10 on
page B-15, placing the mounting bolts into the holes in the floor of the cabinet.
3. Place the centering ring and O-ring against the pump outlet on the left side of the pump.
4. Place the manifold against the centering ring.
5. If necessary, shift the pump so that the connection is clean and there is no strain on the
manifold.
6. Place the NW25 clamp onto the connection and tighten fully.
7. Place the centering ring and O-ring against the right side pump outlet.
8. Place the exhaust manifold against the centering ring.
9. Place the NW16 clamp onto the connection and tighten fully.
10. Working from under the leak detector, place the nuts on the mounting bolts that mount
the pump to the cabinet and tighten them fully.
11. Connect the pump power cord into the 947/948/960.
CAUTION
To ensure reliable testing, after servicing any part of the vacuum
system, the 947/948/960 must be leak checked again. Refer to
“Leak Checking” on page 4-5 for guidelines.
