Graco Therm-O-Flow 55-H, Instructions-Parts List Manual

Page: 34 / 76

34 310–534
Service
Ram Service
For more more information about servicing the hydrau-
lic ram, see Form# 310–533, 165 mm (6.5”) Hydrau-
lic-Powered Ram Modules.
To relieve ram pressure, follow the procedure below.
Ram Pressure Relief Procedure
WARNING
To reduce the risk of serious injury whenever you
service the ram, always follow the procedure
below.
To relieve air pressure in the ram:
1. Relieve the supply unit pressure.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure (page 20).
2. Using the ram hand valve lever on the air control
(Fig. 16), move the ram to the DOWN position.
Fig. 16
Ram OFF (neutral)
Ram UP
Ram DOWN
3. When the ram reaches the full down position,
move the ram hand valve lever to OFF.
4. On the air regulator panel, set the ram regulator
pressure for:
D
RAM UP to 0 (zero)
D
RAM DOWN to 0 (zero).
5. Exhaust pressure from both sides of the ram:
a. Move the ram hand valve lever to the DOWN
position until all hydraulic pressure is ex-
hausted from one side of the ram.
b. Move the ram hand valve lever to the UP
position until all hydraulic pressure is ex-
hausted from the other side of the ram.
6. Close the master air lock-out valve ((B) in Fig. 17).
Fig. 17
B
Removing a Material Drum from the
Supply Unit
WARNING
The material and equipment will be
hot! To reduce risk of injury, wear eye
protection, gloves and protective clothing
when installing, operating, or servicing
this dispensing system.
Before you perform the procedures in this section,
remove the material drum from the supply unit.
On a
heated supply unit, only remove the drum from the
supply unit while the supply unit is at operating temper
-
ature. Observe the cautions and warnings, then follow
steps 1 through 4 of the procedure for Changing
Empty Drums on page 23.