Graco LW075S, Repair Parts

Page: 6 / 12

Repair
6 3A2313E
Reassembly
See F
IG
. 3 on page 7 for detailed view of how parts are
assembled, with torques and other specifications.
1. Clean and inspect all parts.
2. Place the ball (15) in the piston body. Install the seat
(12) and o-ring (14). Lubricate the o-ring and the
threads of the flow-through nut (10). Screw the
flow-through nut (10) into the piston/rod
assembly.
3. Place piston in vice and torque flow-through nut (10)
to 74-86 ft-lb (100-117 N•m). See illustration on
page 4.
4. Lubricate and install new wet cup seal (4) and upper
cylinder seal (5).
5. Install bushing (6) into the wet cup (3).
6. Lubricate and install the u-cup seal (7) into the wet
cup (3).
7. Install the spacer (2) in the top of the upper cylinder.
8. Lubricate the threads then screw the wet cup (3)
into the upper cylinder (1).
9. With the upper cylinder (1) upside down:
a. Drop spacer (16) into the bottom of the upper
cylinder (1).
b. Drop the u-cup (18) into the bottom of the upper
cylinder.
c. Partially thread the lower cylinder (19) into the
upper cylinder (1) to press the u-cup seal into
place until the seal seats.
d. Unthread lower cylinder then drop in the
bushing (17).
e. Push the piston/rod assembly into the upper
cylinder (1).
f. Put o-ring (20) in place.
g. Lubricate threads then torque lower cylinder
against upper cylinder to 90.5-109.5 ft-lb
(122-148.5 N•m).
10. Lubricate and install the seal (23) on the bottom of
the lower cylinder (19).
11. Install the o-ring (24) and intake seat (21) into the
top of the foot valve. Lubricate the o-ring. The
seat (21) is reversible. Turn over or replace as
needed.
12. Lubricate the seal (23) and threads of the lower cyl-
inder (19). Place the ball (22) on the seat (21).
13. Keeping cylinder upright so the seat remains firmly
in place, screw the foot valve (25) into the lower cyl-
inder (19) hand tight.
14. Clamp the cylinder in a vice and torque to 74-86 ft-lb
(100-117 N•m).
15. Torque wet cup (3) to 54-66 ft-lb (73-89 N•m).
NOTICE
All threads, packings, and seals must be well lubri-
cated. Use lubricant (Graco Part Number 111265) or
a similar product.
NOTICE
Discard all o-rings removed from the pump. Com-
pressed PTFE o-rings may cause the pump to leak.