Connect And Disconnect Tubes; Pump Components And Accessories - Graco A Series Instructions - Parts Manual

Installation
4. Set the ram air regulator (27B) to zero. Set the ram
director valve switch (36) to the down position. As
the ram unit slowly falls, guide the pump intake
housing (111) into the wiper plate (P).
5. Set the ram air regulator (27B) to 10 psi (0.07 MPa,
0.7 bar). Push down on the pump to install the wiper
plate (P) onto the intake housing (111). Secure the
wiper plate to the pump with the two screws (302).
6. Connect the 660 mm (26 in.) air line tube (76) from
the connector (37) at the air assist valve (18) to the
connector (310) at the wiper plate (P). Refer to Con-
nect and Disconnect Tubes on this page.

Connect and Disconnect Tubes

Follow these steps when connecting and disconnecting
any air tubes on the DynaMite 190 Extruder assembly
Connection
1. Grasp the tube, then slowly push it straight into the
fitting until it stops.
2. Be sure that the tube is securely connected, and will
not pull out when air pressure is applied. To check,
pull gently on the tube.
Disconnection
1. Follow the Pressure Relief Procedure on page 9.
2. Push evenly on the fitting's red release button.
3. While holding the release button in, pull the tube out
of the fitting.
4. To reuse the tubing, cut off the previous connection
portion at 90°, being careful not to damage the outer
diameter of the tube.
NOTE: Use of a tube cutter is recommended. The fitting
will leak if the tubing is not cut at 90°.
8
Pump Components and
Accessories
To help reduce the risk of serious injury when adjust-
ing or repairing the pump, including skin injection,
splashing fluid, and moving parts, the pump includes
two required safety devices: the bleed-type master air
valve (8) and the pump bleeder valve (25).
The following components are supplied with the pump
(see F . 1 on page 6).
IG
• The bleed-type master air valve (8) is supplied
with your system to relieve air trapped between this
valve and the pump after the air is shut off. Trapped
air can cause the pump to cycle unexpectedly. The
valve is located close to the pump, downstream
from the pump air regulator.
• The pump air regulator (27A) controls pump
speed and outlet pressure by adjusting the air pres-
sure to the pump. The regulator is located upstream
from the bleed-type master air valve.
• The ram air regulator (27B) controls ram speed by
adjusting the air pressure to the ram, and also con-
trols the pressure exerted by the wiper plate on the
fluid.
• The pump bleeder valve (25) is supplied in your
system to relieve fluid pressure in the displacement
pump, hose, and dispensing valve. Triggering the
dispensing valve to relieve pressure may not be suf-
ficient. Be sure the drain hole in the valve is pointing
down. This valve is also used to bleed air from the
pump when priming.
Air Line
Connect an air supply line to the 1/4 npt(f) main air inlet
fitting (57). Install an air line filter and lubricator in the
main air line. In the main air line, upstream from all other
air line accessories, install a second bleed-type master
air valve to shut off all air to the system and to isolate
the accessories for servicing.
Fluid Line
Connect a fluid line to the fluid outlet fitting (28). Con-
nect a suitable dispensing valve to the free end of the
line.
308302U