Air Motor/Pump Removal And Service - Graco Therm-O-Flow 20 EasyKey Instructions Manual

Service

Air Motor/Pump Removal and Service

This procedure must be done with the unit still
warm. The material and equipment will be hot!
For information about servicing the Mini-5 Pump, see
pump manual 307431.
For information about servicing the President air motor,
see air motor manual 306982.
1. Remove the material pail (see Pail Changing pro-
cedure on page 29). Ensure that the air motor shaft
is fully extended and the pump rod is in the fully
down (parked) position.
2. Make sure the platen is down and the ram up/down
lever is in the neutral position.
Follow the Pressure Relief Procedure on page 27
when you stop spraying and before cleaning, checking,
servicing, or transporting equipment.
3. Bleed off excess material and pressure in the sys-
tem by opening the dispense gun and catching the
material in a waste container.
4. Press to turn off the system heat.
5. Turn OFF the main electrical power supply to the
unit. Follow all applicable safety procedures and
lockout rules.
6. Turn OFF the main electrical disconnect (K) located
on the left side of the Therm-O-Flow 20.
Make sure the main disconnect is off before continuing
with this procedure.
7. Disconnect all material hoses.
8. Remove air line from air motor and air lines to the
platen blow-off valve.
9. Remove nuts (105) from tie rods at the pump end.
See F . 22.
IG
40
10. Remove the screws (36) and washers (22) holding
the pump adapter (107) to the platen.
11. Remove the cover from the junction box (31).
Remove the screws holding the junction box to the
tie rods (104).
12. Fully loosen coupler (111) from the pump rod (G).
13. Slowly raise elevator to achieve enough separation
of the tie rods to remove the pump.
14. Remove the pump.
15. Reverse this procedure to reinstall the new or rebuilt
pump.
312094K