Ariel JGI, Technical Manual

Page: 155 / 178

F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ S
ECTION
5 - M
AINTENANCE
9/08 PAGE 5-39
“Coolant Out”, or if air is applied to the connection tap stamped “Lube”, air should be exiting
at the appropriate cup on the inside diameter of the case.
Pressure leak test packing cases as follows:
1. Apply 60 to 100 psi (4 to 7 bar) dry, compressed air pressure to the connection
tap stamped “Coolant In”. For water cooled rod packing cases in non-lube ser-
vice, compressed air is to be oil free. Air should exit at the connection tap
stamped “Coolant Out”. Air applied to the connection tap stamped “Lube” should
exit at the appropriate cup on the inside diameter of the case.
2. Plug the connection tap stamped “Coolant Out” and apply 60 to 100 psi (4 to
7 bar) dry, compressed air pressure to the connection tap stamped “Coolant In”
through a ball valve with a calibrated pressure gauge located between the ball
valve and packing case. Close the ball valve and disconnect the air supply.
There should be no pressure drop for five minutes minimum. Cases which fail
this testing procedure are to be disassembled, inspected, repaired, re-assem-
bled and re-tested. Packing cases may be bolted into place in a cylinder head to
aid sealing, using proper bolting and tightening torques.
Valves
Valves - Removal
1. Slightly loosen all of the bolts on each valve cap. With all the bolts loose, the cap
should stay in its original position. If it pushes out on its own accord,
STOP! Take
steps to completely vent the cylinder. See Caution above. A typical valve
assembly is shown in Figure 5-29 on Page 5-41.
2. After all the above safety checks and with cap screws still in place but loosened,
move the valve-cap out until the O-ring clears the cylinder to be sure that the cyl-
inder is properly vented. A pair of appropriate pry bars, one on each side of the
cap, will help pry it out.
3. Remove cap screws and valve cap.
CAUTION!: BE CAREFUL TO PREVENT THE VALVE CAP, RETAINER AND/OR VALVE
FROM FALLING OUT OF BOTTOM VALVE POCKETS TO PREVENT THE
POTENTIAL OF PERSONAL INJURY.
CAUTION
BEFORE ATTEMPTING TO REMOVE ANY VALVE CAP, BE CERTAIN
THAT ALL PRESSURE HAS BEEN VENTED FROM THE COMPRESSOR
CYLINDER. THE PRESSURE MUST BE COMPLETELY VENTED FROM
BOTH THE SUCTION AND DISCHARGE PASSAGES OF THE CYLINDER.
SEE FIGURE 1-4 ON PAGE 1-6 FOR LOCATION OF IMPORTANT SAFETY
INFORMATION PLATES.
!