Graco Z-Pump S1 Series Instructions - Parts Manual page 12

Repair
2. Remove inlet hose and drain inlet housing (106).
See F . 5.
IG
3. Remove valve inlet cap (136) from inlet housing
(106), and remove O-ring (108).
F . 5
IG
4. Remove parts shown for the Upper Check (A). This
includes the spring retainer (137), ball cage housing
(138), ball check spring (139), HSG ball retainer
(140), silicone ball (141), ball seat (142), O-ring
(143), and check retainer (144).
5. Remove lower check (B), including the spring
retainer (137), ball cage housing (138), ball check
spring (139), HSG ball retainer (140), silicone ball
(141), ball seat (142), O-ring (143), and check
retainer (144). See F
136
139
140
138
142
108
137
141
138
143
108
F . 6
IG
12
136
. 6.
IG
108
137
141
Upper
Check (A)
143
144
139
140
Lower
Check (B)
142
144
6. Clean all parts in a compatible solvent. Lay them in
order for easier reassembly. Inspect each ball and
seat for nicks or scratches; replace as required.
7. It is recommended to replace both O-rings (108,
143) after cleaning.
108
106
3A0019ZAC