Graco A Series Repair Manual page 13

17. Grease piston packings.
NOTE: Do not slide piston assembly into top of sleeve as this
may damage piston packing.
18. Slide piston assembly (with force) into bottom of
sleeve. Make sure V-packing and u-cup are not
rolled over or damaged. Mark IV and Mark VII
models: Install o-ring (231) on sleeve spacer (232).
Install sleeve spacer on sleeve.
3A6584A
206
ti7575b
ti7578c
19. Grease top inch or two of piston rod that will go
through the cylinder throat packings.
20. Grease o-ring (221 and 234) and place on sleeve.
Slide sleeve/piston rod assembly into bottom of
cylinder. Replace o-ring (207) if desired.
O-ring (207) is not required for safe pump operation.
21. Torque seal and packing nut (202) to the following:
Models
16Y598, 17H828
16X423, 17H831, 17H830, 16Y706,
17H829, 25E689
Remove o-ring when pump packings begin to leak
after extended use. Then tighten packing nut down
until leakage stops or reduces. This allows
approximately 100 gallons of additional operation
before a repacking is required.
Service
ti7579a
Torque
100 ± 10 in-lb
(11.3 ± 1.1 N•m)
140 ± 10 in-lb
(15.8 ± 1.1 N•m)
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