Graco 918334, Instructions-Parts List Manual

Page: 38 / 86

38 310528
Service
Servicing the Pump/Motor Assembly for
the Therm-O-Flow Mini-5 Supply Unit
The sections below describe how to:
D
remove the pump lower assembly from the air
motor
D
re-attach the pump lower assembly to the air motor
D remove the follower from the pump lower assembly
Removing the Pump Lower Assembly from the Air
Motor
For more information about the pump lower assembly,
refer to document number 310555.
To remove the pump lower assembly from the ram,
follow this procedure:
1. If the material drumpail 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 Pails
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 21).
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 31).
4. Relieve the ram air pressure.
5. Turn off the electrical power to the supply unit. Fol-
low all applicable safety procedures and lockout
rules.
6. Turn the system CONTROL ON switch to OFF.
7. 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.
8. Bleed off pressure in the system and excess
material by opening the dispense gun and catching
the material in a waste container.
9. Disconnect all material hoses.
10. Remove the connecting rod nut (100) from the
connecting rod.
11. Remove the 3 nuts (170) and 3 washers (160)
from the stand-off rods (70).
12. Remove the pump and service it as needed.
Re-attaching the Pump Lower Assembly to the
Air Motor
Reverse the above procedure to re-attach the pump to
the air motor. Make sure you torque the connecting rod
nut to 40.67 – 54.23 N.m (30 – 40 ft-lb).
Removing the Follower from the Pump Lower
Assembly
See page 58 for more information. To remove the
follower from the pump assembly:
1. Remove the pump by following steps 1 – 9 of the
Removing the Pump Lower Assembly from the
Air Motor procedure, above.
2. Remove the sensor from the follower plate.
3. Loosen the coupling nuts from the follower conduit.
4. Remove the air line from the blow-off valve.
5. Remove the screws (180) and washers (170) from
the follower adapter.
6. Slide off the follower.