GSi GRA, Installation And Operation Manual

Page: 34 / 40

8. Troubleshooting
34 PNEG-2174 Sampler - Model GRA
Valve vs. Cylinder Leak Test
When there is continuous leakage out of a valve exhaust port, proceed as follows to determine if the leak
is caused by defective valve seals or by defective cylinder seals.
1. Cylinder retracted as shown Detail 1 in Figure 8B.
a. If there is continuous leakage out of Port “5”, the valve seals are defective and must be replaced.
b. If there is continuous leakage out of Port “3”, the problem can be with the valve seals or the
cylinder seals. To determine which proceed as follows.
• Disconnect the line between Valve Cylinder Port “2” and the cylinder per Detail 2
in Figure 8B.
• If leakage continues out of Port “3” and/or Cylinder Port “2”, the valve seals are defective and
must be replaced.
• If there is a leakage out of the line from the cylinder, the cylinder seals are defective and must
be replaced.
2. Cylinder extended as shown Detail 3 in Figure 8B.
a. If there is continuous leakage out of Port “3”, the valve seals are defective and must be replaced.
b. If there is continuous leakage out of Port “5”, the problem can be either the valve seals or the
cylinder seals. To determine which proceed as follows:
• Disconnect the line between Valve Cylinder Port “4” and the cylinder per Detail 4
in Figure 8B.
• If leakage continues out of Port “5” and/or Cylinder Port “4”, the valve seals are defective and
must be replaced.
• If there is a leakage out of the line from the cylinder, the cylinder seals are defective and must
be replaced.
Figure 8B
Detail 3
Detail 1
Detail 2
Detail 4