Graco Check-Mate 800 Instructions Manual page 17

13. If the priming piston rod (18) or piston (12) are
damaged: Place the piston flats in a vise. Unscrew
the priming piston rod (18).
14. Place the piston guide (11) in a vise, as shown in
F . 9. Use an adjustable wrench to unscrew the
IG
piston seat (14) from the guide. Remove the seal
(13).
NOTE: Always replace the seal with a new one.
15. Inspect the mating surfaces (ZH) of the piston (12)
and piston seat (14) for damage or wear.
16. Disassemble the intake check valve assembly (ZE).
a. Place the intake valve body (16) in a vise.
Unscrew the packing nut (15).
b. Remove the seal (39) from the packing nut.
Remove the glands and packings (ZG) from the
valve body.
17. Inspect the mating surfaces (ZD) of the intake valve
body (16) and seat (37) for damage or wear. See
F . 5, page 15, and F
IG
NOTE: The seal (39) is press-fit in the nut (15) and may
require cutting to ease removal.
Piston check valve (see Fig. 10).
1
Intake check valve (see Fig. 11).
2
Lubricate.
3
F . 10 Piston Check Valve Detail
IG
308352E
. 11, page 18.
IG
1
2
11
12
ZH
*8
3
18
1
18. Unscrew the bleeder valve plug (20) completely
from the valve body (29). Clean the valve threads
and the bleed hole.
NOTE: It is not necessary to remove the valve body
from the pump outlet housing (9).
19. Inspect all parts for damage. Clean all parts and
threads with a compatible solvent.
20. Follow the Assemble the Displacement Pump
procedure, page 18.
14
11
1
03832
F . 9
IG
10
13*
14
17
03819
When reassembling items 11 and
14, torque to approx. 75–88 N•m
(55–65 ft-lb).
3
Repair
17