LEAKAGE TEST - TM-5-3820-256-24-4

Fig. 9 Crow Section of Emergency Relay Valve

TM-5-3820-256-24-4 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
Page Navigation
110

SERVICE MANUAL LEAKAGE TEST To gain access to the inversion valve on some series of vehicles the driver’s seat must be removed and the floor panel under the seat must be removed. 1. Set parking brake or block wheels to prevent vehicle from moving. 2. Remove the air line at the control port, supply port and delivery ports. 3. Connect the air line from control port (from tractor protection valve) to the supply port. Plug the delivery port. 4. With 689-861 kPa (100-125 psi) in air system, apply the brake valve or hand control valve. 5. Apply soap solution to the supply cap nut control port and exhaust port. There should be no air leakage at the supply cap nut and a very slight leakage is permissible at the exhaust and control ports. Excessive leakage at the control port would indicate the O-ring on piston stem is faulty and excessive leakage at the exhaust port would indicate that the piston stem exhaust seat or inlet valve is faulty. Release the brake valve or hand control valve. 6. Disconnect the line at the supply port and remove plug from delivery port. Reconnect the air line from tractor protection valve to the control port. 7. Apply either the brake valve or hand control valve. 8. Apply soap solution to the exhaust port and supply port. Excessive leakage at exhaust port would indicate the piston O-ring is faulty and if air leakage at supply port is noted, the O-ring on piston stem is bad. A slight leakage is permissible. 9. If valve passes the leakage test connect the two remaining air lines. The air line from the air cylinder is connected to the delivery port and the air line from the solenoid control assembly is connected to the supply port. If the valve failed the leakage test it must be replaced. REMOVE AND REINSTALL On some series of vehicles the inversion valve is located below the floor panel under the driver’s seat. To gain access to the valve the seat and floor panel must be removed. Be sure to set the parking brake. 1. Disconnect air lines at valve. 2. Remove mounting bolts. 3. Transfer fittings to new valve. 4. Remount valve to holes in holes provided. 5. Reconnect air lines as follows: Air line from tractor protection valve to control port. Air line from solenoid control assembly to supply port. Air line to air cylinder is connected at delivery port. CTS -4079-CHAPTER III- PRINTED IN UNITED STATES OF AMERICA PAGE 9

Privacy Statement
Press Release
Contact