Graco Python A25011, Instructions - Parts Manual

Page: 33 / 58

Repair
3A4386E 33
Timing Valve
Timing Valve Repair
1. Follow the Pressure Relief Procedure, page 17.
2. Remove the spring retainer (112) from the bottom of
the timing valve. Inspect the sealing o-ring (114)
and replace as necessary.
3. Remove the spool return spring (115), inspect and
replace if necessary.
4. Remove the two screws (111) to separate the two
halves of the timing valve (101 & 110). Inspect the
three face seal o-rings (106) and replace as neces-
sary.
5. Pull the spool (103) out of the lower housing (101).
Inspect and replace as necessary.
6. Remove all of the seal cartridge components by
hooking the radial ports with a plastic pick. Take
care not to scratch or damage any of the metal or
plastic parts. Sealing can be compromised.
F
IG
. 21 Separate upper and lower housings
106
111
112
114
115
110
101
F
IG
. 22 Remove timing valve spool
103
125
102
130
102
130
101