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

Page: 37 / 76

37 310–534
Service
Removing/Re-installing the Pump from the
Ram
For information about servicing the Check-Mate

800
Displacement Pump, see Form# 308–570. For in-
formation about servicing the Therm-O-Flow Pump
Module, see Form# 310–530.
For information about the pump mounting kit, See
Fig. 30 on page 52.
To remove the pump assembly from the ram, follow
this procedure:
1. If the material drum has already been removed
from the supply unit, go to step 2. If you need to
remove the material drum, perform the procedure
in Changing Empty Drum on page 23.
2. Make sure the ram hand valve is in the OFF
position.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure (page 20).
3. Relieve the supply unit pressure.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve ram pressure, always
follow the Ram Pressure Relief Procedure
(page 34).
4. Relieve the ram pressure.
5. Turn off the electrical power to the supply unit.
Follow all applicable safety procedures and lockout
rules.
6. Turn OFF the main electrical disconnect.
WARNING
ELECTROCUTION HAZARD
To reduce risk of injury or damage to
equipment, make sure the main discon-
nect is OFF before continuing with this
procedure.
7. Bleed off pressure in the system and excess
material by opening the dispense gun and catching
the material in a waste container.
8. On the electrical control panel, turn the system
CONTROL ON switch to OFF.
9. Disconnect all material hoses.
10. RTV sealant on the pump shroud may make it
difficult to remove individual shroud pieces. Using
a knife or a razor, scrape the sealant off of the
seams of the shrouds.
11. Disconnect the junction box from the pump by:
a. Removing the cover of the junction box.
b. Disconnecting the heater wires and sensor
wires that come from the pump.
c. Removing the wires from the junction box.
d. Disconnecting the pump’s back shroud and
moving it backwards out of the way.
12. Loosen the pump mounting screws (30) and then
remove the pump mounting plates (20). (See
Fig. 30 on page 52).
13. Remove the 2 bolts from the top of the follower
rods.
14. Secure the air motor to the ram tie bar.
15. Remove the pump and service it as needed. To
remove the remaining shrouds from the pump, go
to the next section, Separating the Pump from
the Air Motor (page 38). See Form# 308–570 for
more information about the pump.
16. Reverse this procedure to reinstall the pump. Be
sure to re-apply RTV sealant to the seams of the
shrouds before replacing them on the pump.