Pneumatic Pressure Relief Procedure - Graco Uni-Drum Instructions Manual

Pneumatic Pressure Relief
Procedure
This procedure describes how to relieve pressure on the
Pneumatic Logic Panel (G) and cylinders. Use this
procedure whenever you perform ram assembly service
on the piston rod seal or the ram piston.
1. Follow Fluid Pressure Relief Procedure on page
34.
2. Fully lower the ram by setting the RAM POSITION
Switch (AG) to LOWER. Leave the switch in the
LOWER position.
3. Open the door on the Pneumatic Logic Panel (G).
4. Adjust the air pressure to 0 PSI for the RAM DOWN
Air Regulator (AK). Refer to the gauge on the RAM
DOWN Air Regulator (AK) and R3 Regulator (AL) to
verify the ram has been depressurized. See F
5. Slowly open the drain cock located on the bottom of
the air cylinders (CL).
6. After the air pressure has been relieved, remove the
Ram Down air line running from the top of the
Pneumatic Logic Panel (G) to the ram cross bar
(CB).
7. Close the Main Air Shutoff Valve (P) on header.
8. Leave the drain cock open and the Ram Down
airline removed until service is complete.
9. After service is complete, close drain cocks and
make all pneumatic connections and open the Main
Air Shutoff Valve (P) to header. Perform the
Adjusting the RAM UP and RAM DOWN Air
Regulators procedure, page 30.
309028ZAT
P
CB
G
AG
CL
. 17.
IG
F . 16
IG
AK
F . 17
IG
Pressure Relief Procedures
AL
35