Graco Dyna-Star 224741, Instructions Manual

Page: 17 / 28

Repair
308155U 17
Displacement Pump Repair
(Models 239882, 224741, and
224742)
Intake Valve
Refer to F
IG
. 14.
1. If possible, flush the pump. Relieve the pressure,
see Pressure Relief Procedure, page 8.
2. Unscrew the valve body (110). Remove the o-ring
(111), ball (109), and retainer (112).
3. Inspect the parts for wear or damage. If the ball is
nicked, replace it. Reassemble, using liquid thread
sealant on the male threads.
Displacement Pump
Refer to F
IG
. 14.
NOTE: Clean and inspect all parts for wear or damage
as you disassemble them. Replace parts as needed.
For the best results, always replace all the o-rings and
packings when you disassemble the pump. The parts
list on page X give the recommended parts to keep on
hand.
A guide collar is required for installing the piston in the
displacement cylinder. Order Guider Collar Tool (Part
No. 168085) or make a collar using shim stock having a
0.016 inch (0.41 mm) maximum thickness.
1. If possible flush the pump. Relieve the pressure.
See Pressure Relief Procedure, page 8.
2. Remove the intake valve. Follow Disconnect the
Reciprocator and Displacement Pump procedure on
page 12.
3. Carefully inspect the smooth, inner surface of the
cylinder (108) for scoring or irregular surfaces. Such
damage causes premature packing wear and leak-
ing, replace the part as needed.
4. Place the piston housing (104) in a vise. Unscrew
the piston seat (107) and remove the packings.
5. Grease the new piston packings and stack them
one at a time on the piston seat (107), making sure
all parts face the way shown in F
IG
. 14. Install the
ball (116). Apply liquid sealant to the male threads
of the seat (107), and screw on the piston housing
(104).
6. Remove the ball retainer (112) from the intake hous-
ing assembly by grabbing the open leg and pulling it
toward the center of the housing. Inspect the ball
(109) and seat, and replace as needed.
Intake Valve Reassembly
1. Grease the inside top of the displacement cylinder
(108) opening. Thread the guide collar onto the dis-
placement cylinder. Slide the packing a assembly
into the collar/cylinder. See F
IG
. 15. Remove the
collar guide.
F
IG
. 14
117
103
104
116
115
114
114
106
114
107
115
108
112
109
111
110
118
119
105
0.2 ”
(5 mm)