Graco UniDrum C59784 Instructions And Parts List page 25

Before lowering the Follower Plate (D) into the drum,
make sure that nothing is between the Follower Plate
and the drum, or between the ram tie bar and the
top.
14. Lower the Follower Plate (D) as follows:
a. Set the RAM POSITION Switch (AJ) to LOWER.
b. Lower the Follower Plate (D) until the material is
evident in the bleed ports.
c. Set the RAM POSITION Switch (AJ) to
HOLD/NEUTRAL.
d. Replace the Bleed Sticks (H).
e. Set the RAM POSITION Switch (AJ) to LOWER.
15. Close both Pump No. 1 and Pump No. 2 Inlet
Valves (K) (located on top of the air motor).
16. Prime the Pumps as follows:
a. Set both the Pump No. 1 REGULATOR Control
Knob (AE) and Pump No. 2 REGULATOR
Control Knob (AG) to 30 psi.
b. Push the Pump Air On button (AC) to open the
air supply to the Pumps.
NOTE: Pumps should not start if the inlet valves were
closed in step 15.
c. Use a catch device to bleed the Pump. Slowly
open Pump No. 1 bleed valve. Back off the
adjustment screw several turns; do not remove
the screw.
d. Open the Pump No. 1 Inlet Valve (K) to start the
Pump.
e. Allow the Pump to cycle slowly until all air
escapes and material flows free of air from the
bleed valve.
f. Close the Pump No. 1 Inlet Valve (K) and the
bleed valve.
309169ZAF
g. Wipe any excess material from the Pump bleed
valve outlet to prevent material from drying and
curing. Cover the Pump bleed valve outlet with
a material-compatible grease.
NOTE: If the Pump bleed valve has a grease zerk, apply
a material-compatible grease into the zerk fitting until
grease flows from the grease bleed hole.
h. Repeat steps c - g for Pump No. 2.
17. Push the Pump Air Off button (AD) on the
Pneumatic Logic Panel (G).
18. Open both Pump No. 1 and Pump No. 2 Inlet
Valves (K) (located on top of the air motor).
F . 8
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NOTE: If the Pump does not prime properly, which may
occur with heavier, high viscosity fluids, increase the air
pressure with the RAM DOWN Air Regulator (AP).
NOTE: If fluid is forced out around the top wiper, ram
pressure is too high; decrease the air pressure with the
RAM UP Air Regulator (AN).
NOTE: Ram pressure adjustments are carried out using
the dual REGULATOR Control Knobs (AE, AG) inside
the Pneumatic Logic Panel (G). The upper regulator
knob controls the downward pressure of the ram, and
the lower regulator knob controls the upward pressure
of the ram. See F . 3 on page 11.
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Operation
K
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