RING-EXPANDER 4540377 - Caterpillar

Illustration 4 g03341572
Close pressure differential valve
1. Close the pressure differential valve (A) by turning the knob clockwise (CW) .
Illustration 5 g03341588
Open nitrogen cylinder
2. Open the nitrogen cylinder (B) by turning the knob counterclockwise (CCW) .
Before opening the nitrogen tank, turn the tank regulator handle (CCW) to ensure that no pressure is leaving the regulator.
Illustration 6 g03341591
Open ball valve
3. Turn the ball valve handle (C) to the on position.
Illustration 7 g03341592
Adjust the regulator
4. Adjust the regulator at the nitrogen cylinder (B) until the 8T-0848 pressure gauge reaches 138 kPa (20 psi).
Do not use pressure in excess of 138 kPa (20 psi).Excess pressure may damage the seals.
Illustration 8 g02442942
Close the ball valve
5. Turn the ball valve handle to the off position.Test Cycle
Illustration 9 g02443016
Insert lubricator tip
1. Insert the lubricator tip into the stopper.
Illustration 10 g03341593
Open the ball valve
2. Turn the ball valve handle (C) to the on position.
Illustration 11 g03341595
Open the pressure differential valve
3. Open the pressure differential valve (A) by turning the knob (CCW) .
Illustration 12 g02444522
Observe the gauges
4. The pressure differential valve gauge needs to read zero and the nitrogen pressure gauge should be at 138 kPa (20 psi).Note: An adjustment of the nitrogen pressure may be needed to reach 138 kPa (20 psi)
Illustration 13 g03341596
Close the ball valve
5. Turn the ball valve (C) handle to the off position.
Illustration 14 g03341597
Close the pressure differential valve and begin the count
6. Begin a 10 second count upon closing the pressure differential valve (A) knob. Turn the knob (CW) to close.
Illustration 15 g02444637
Observe the pressure differential valve gauge
7. Watch the pressure differential valve gauge needle for the 10 second time period.
A pressure drop of 2.5 percent or less than 3.5 kPa (0.5 psi) is acceptable. The component has passed leak test.
A pressure drop greater than 2.5 percent 3.5 kPa (0.5 psi) is not acceptable. The component has failed leak test.Correction of Failure
Follow the steps below for a component that fails leak test.
Disassemble the component.
Determine the cause of failure and correct the issue.
Perform pressure test on the repaired component to make sure that the item passes testing. Use the steps provided in this document. Refer to the section ""Test Cycle" ".