Graco Python A25011, Instructions - Parts Manual

Page: 34 / 58

Repair
34 3A4386E
7. The stack of seal cartridge components includes
four sets of seals (105) and o-rings (124). Inspect
and replace these as necessary. The repair parts
from Graco come as a piston assembly with the
seals factory installed.
8. Remove the drive piston (107) from the upper hous-
ing (110) with a needle-nose pliers.
NOTE: Keep the seal (108) and piston (107) together.
9. Inspect the seal (108) and piston (107), and replace
if necessary. The repair parts from Graco come as a
piston assembly with the seals factory installed.
10. Remove the control knob (122) by loosening the two
hex set screws (123) with a 1/16” hex key wrench.
11. Remove the knob control spring (120) and the
retaining ring (119).
12. Remove the needle valve (117) by unscrewing it
from the housing (110). Inspect the sealing o-ring
(118) and replace as necessary.
13. Clean and inspect all parts before reassembly.
14. Apply a thin coat of grease to the o-ring (118) and
reinstall the needle valve (117). Tighten needle fin-
ger tight.
15. Install the retaining ring (119) and knob control
spring (120).
F
IG
. 23 Seal cartridge
F
IG
. 24 Remove timing valve piston
124
105
102
105
124
110
108
107
F
IG
. 25 Remove timing valve knob assembly
122
123
120
119
117
118
110