Flush The System; Start And Adjust The Ram - Graco DM-22 Manual

Flush the System

To avoid fire and explosion, always ground equipment
and waste container. To avoid static sparking and
injury from splashing, always flush at the lowest pos-
sible pressure.
NOTE: The pump is tested with lightweight oil, which
remains to protect pump parts. If the fluid you are using
might be contaminated by the oil, flush the oil out with a
compatible solvent before using the pump.
Always flush the pump with a liquid or solvent compati-
ble with the fluid you plan to pump through the system's
wetted parts. Check with your fluid manufacturer or sup-
plier for recommended fluids and flush frequency.
Always flush the pump before fluid dries on the displace-
ment rod.
Never leave water or water-based fluid in a carbon
steel pump overnight. If you are pumping
water-based fluid, flush with water first, then with a
rust inhibitor, such as mineral spirits. Relieve pres-
sure, but leave rust inhibitor in the pump to protect
parts from corrosion.
1. Follow the Pressure Relief Procedure on page 12.
2. Remove the tip/nozzle from the dispensing device
you are using with the system.
3. Hold a metal part of the dispensing device firmly to
the side of a grounded metal pail.
4. Start the pump. See Start and Adjust the Pump on
page 14. Always use the lowest possible fluid pres-
sure when flushing (For 1 Gallon model only).
5. Trigger the dispensing device.
6. Flush the system until clear solvent flows from the
dispenser.
7. Follow the Pressure Relief Procedure on page 12.
3A7931B
NOTICE

Start and Adjust the Ram

The pump will fall to the bottom slowly if shut off the air
supply to the ram when the ram is raised. Also, as the
ram is raised and lowered, the Wiper Plate (AU) (for 1
Gallon model only), ram tubes, and pump mounting
bracket move. To reduce the risk of pinching or ampu-
tation of fingers, keep your hands away from the Wiper
Plate (AU), lip of the fluid can, pump bracket, ram
tubes, and air motor coupling cavity while the pump is
operating.
NOTE: Reference numbers and letters in parentheses
in the text refer to the callouts in F
on page 7, 8 and 9 and the parts drawings. Refer to
those for operation.
1. Close all air regulators and bleed-type air valves.
2. Open air valve in the main air line and set the Ram
Air Regulator (AF) to 28 psi (0.2 MPa, 2 bar). Set
the Ram Director Switch (AP) to the "up" position
and let the ram rise to its full height. To change the
speed at which the ram raises and lowers, adjust
the air regulator to increase or decrease the air vol-
ume.
NOTE: If the system is 300 CC model or 600 CC model,
do only Steps 1 and 2. The remaining steps apply to 1
Gallon model only.
3. Check the fluid can is not dented or out of shape,
which would damage the Wiper Plate (AU) and
cause leakage around the wiper. Cut off the top of
the fluid can with a can opener, or remove the bot-
tom of the can. Ensure the edge is free of burrs,
which would damage the Wiper Plate (AU). If neces-
sary, bend the edge back with pliers so the Wiper
Plate (AU) can enter the can without obstruction.
Lubricate Wiper Plate Ring (AX) to help Wiper Plate
(AU) enter the can easily.
Operation
. 2, F . 3 and F . 4
IG IG IG
13