Graco Therm-O-Flow 20, Instructions - Parts Manual

Page: 28 / 66

Service
28 309858K
President Pump/Motor Service
Removing Pump from Air Motor
1. Follow Before Servicing procedure, page 21.
2. Make sure the ram control lever is set to OFF.
3. Turn off the electrical power to the supply unit. Fol-
low all applicable safety procedures and lockout
rules.
4. Turn OFF the main electrical disconnect.
5. Bleed off pressure in the system and excess mate-
rial by opening the dispense gun and catching the
material in a waste container.
6. Turn the system CONTROL switch (65) to OFF.
F
IG
. 5, page 17.
7. Disconnect all material hoses.
8. Remove the connecting rod connector (35) from the
connecting rod (34). F
IG
. 15.
9. Remove the 3 nuts (42) and washers (41) from the
stand-off rods (32).
10. Remove the pump and service it as needed.
11. Reverse this procedure to reinstall the pump. Torque
the connecting rod nut to 30-40 ft-lb (40.67-54.23
N•m).
Removing Follower Plate
Refer to page 42.
1. Remove the pump by following steps 1-7 of Remov-
ing Pump from Air Motor, above.
2. Remove the sensor from the follower plate (9). F
IG
.
15.
3. Loosen the coupling nut (122) from the follower con-
duit.
4. Remove the air lines (116, 117) from the blow-off
valve (103).
5. Remove the 6 screws (109) and washers (108).
6. Slide off the follower plate (9).
For more information on servicing the pump lower
assembly, refer to manual 307431.
F
IG
. 15
35
34
42
41
32
9
Torque to 20-30 ft-lbs (27-41 N•m)
Torque to 30-40 ft-lbs (41-54 N•m)
Fill packing nut 1/2 full of TSL (43)
Tie-wrap armored portion of sensor onto conduit leading up to
junction box; continue to cable from junction box to main control
box to point of access.
1
2
3
4
4
1
2
3
122
116
117
103
109
108