Graco GT 750, Instructions Manual

Page: 9 / 18

Service
3A5363B 9
7. Unscrew bearing (11) from foot valve housing.
Remove the poppet check (12) and inspect foot
valve packings (13) (F
IG
. 5).
8. Unscrew down tube (20) from pump base (21) (F
IG
.
6).
Clean the tube and inspect it for wear by holding it
up to a light at a slight angle. If you see wavy lines
or scratches where the piston travels, replace the
tube as it will not seal well with the new piston seal
and the pump will perform poorly.
9. Loosen nut (5) and unscrew the valve housing (6)
from connecting rod (4) (F
IG
. 7).
10. Unscrew bolts (23) that connect pump base (21) to
the air motor (F
IG
. 8).
11. Remove pump base (21) from air motor and
unscrew packing gland (2) (F
IG
. 8).
12. Remove the following seals and inspect: piston seal
(22), o-ring (17), o-ring (29), throat seal (19), o-ring
(16) from the pump base (21) (See Parts, page 13).
13. Clean and inspect all parts.
F
IG
. 5
F
IG
. 6
12
11
13
10
20
21
F
IG
. 7
F
IG
. 8
5
6
4
23
21
2