Graco Inc. 257999 Paint Sprayer User Manual


 
Repair
36 313872B
2. Use hex nut driver to remove fluid manifold (AD).
3. Disconnect signal cable.
4. Remove Front End, see page 33.
5. Disconnect air quick coupler (AC).
6. Unscrew piston safety lock assembly and remove.
Inspect o-ring and replace if necessary.
7. Place 1/2 in. socket on the piston shaft through the
front of the gun body. Entering through the rear of
the gun body, place a 3/4 in. socket with extension
on the rear piston. Hold piston shaft in place and
remove the rear piston. Inspect rear piston o-ring
and replace if necessary.
8. Entering through the rear of the gun body, place a
3/4 in. socket with extension on the bulkhead.
Remove the bulkhead. Inspect bulkhead o-rings and
replace as necessary.
9. Push piston shaft towards rear of gun to remove
front piston and piston shaft from the gun body.
10. Use a 1/2 in. socket on the piston shaft and
15/16 in. wrench on the front piston to remove front
piston from piston shaft.
11. Inspect o-rings. Replace if worn or damaged. Liber-
ally lubricate o-rings then reinstall.
12. Apply medium strength threadlocker to threads then
install front piston onto piston shaft. Torque to
100-110 in-lb (11.3-12.4 N•m). See Component
Identification on page 16.
13. Install piston shaft and piston assembly into gun
body. See Component Identification on page 16.
14. Install bulkhead onto piston shaft. Torque to
100-110 in-lb (11.3-12.4 N•m). See Component
Identification on page 16.
15. Apply medium strength threadlocker to threads then
install rear piston onto piston shaft. Torque to
100-110 in-lb (11.3-12.4 N•m). See Component
Identification on page 16.
16. Install piston safety lock. See Component Identifi-
cation on page 16.
17. Attach Front End, see page 35.
TI14463a1
AD
TI14463a1
AC
TI14465a
TI14465a
Piston
Shaft
Access the
Pistons and
Bulkhead