Air Motor/Pump Removal And Service - Graco Therm-O-Flow 20 EasyKey NXT 2200 Instructions-Parts List Manual

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 Check-Mate
Displacement Pump, see Instruction Manual 308570.
For information about servicing the NXT Air Motor, see
Instruction Manual 311238.
1. Remove the material pail (see Pail Changing pro-
cedure on page 31). 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 Pressure Relief Procedure on page 29 when
you stop spraying and before cleaning, checking, ser-
vicing, 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.
311976A
8. Remove the pump sheet metal enclosure (A). See
F . 23.
IG
a. Remove the cover screws (B).
b. Disconnect the pump heater wires, the ground
wire, and the sensor mounted to the pump.
™
800
c. Disconnect the platen sensor (C).
9. Remove the air motor top cover.
10. Disconnect electrical cable from air motor.
11. Remove air line from air motor and air lines to the
platen blow-off valve.
12. Remove nuts (F) from tie rods at the pump end. See
F . 23.
IG
13. Disconnect the u-bolts (19) from the tie rod and
slide the end of cable track (17) outboard of the
mounting plate. See Parts on page 46.
14. Fully loosen pump rod coupler to the air motor rod
(G).
15. Slowly raise elevator to achieve enough separation
of the tie rods to remove the pump.
16. Remove bolts from air motor mounting plates.
17. Remove the pump.
18. Reverse this procedure to reinstall the new or rebuilt
air motor.
Inspection/Maintenance Frequency
The pump packings do not require any other service or
maintenance, except as described in the Daily Mainte-
nance Procedures. See 308570 for inspection frequency
of the pump.
Throat Packings
Refer to manual 308570 or 311536 for a list of throat
packing kits and replacement instructions.
Service
43