Graco A Series Instructions-Parts List Manual page 37

Reassembling the Pump
NOTE: The lips of the throat V -packings MUST face
DOWN. The lips of the piston V -packings MUST
face up. The lips of the U-cup seal (205) MUST
face down .Incorrect installation damages the
packings and results in pump leakage.
Coat the piston rod, inside of the cylinder , and
the packings with lightweight oil to help prevent
packing damage when inserting the piston rod.
1. Check the outside of the piston rod (223) and the in-
side of the cylinder (216) for scoring or scratches. If
the parts are damaged, new packings will not seal
properly. Replace these parts if needed.
2. Stack the backup washer (219*), u-cup seal (205* –
lips down ), female gland (220*), packings (217* – lips
up ) and male gland (213*) onto the piston valve (224).
See Fig 37–1.
3. Tighten the packing retaining nut (214) onto the piston
valve (224) and torque to 10.5 in–lb (1.2 N.m). Then
unscrew the nut and retighten, finger tight only.
Note the alignment of the piston (D) to the nut (B)
and maintain this alignment through Steps 3 to 7.
203*
TORQUE (214) TO
10.5 IN-LB
(1.2 N.M)
SEE Fig 36–2
FOR DETAIL OF
PACKINGS
Fig 37–1
4. Apply only 1 drop of adhesive, supplied with the repair
kit, to the threads of the piston valve. Place the small
ball (203*) on the piston valve (224). See Fig 37–1.
5. Hand tighten the valve assembly into the piston rod
just until the nut (214) contacts the face of the rod. See
Fig 37–1.
214
TORQUE NUT
ONTO ROD TO
18–20 FT-LB
(24–27 N.M)
Fig 36–2
6. Place the piston rod flats in a vise.
7. Tighten the piston nut (214) onto the piston rod (223).
Torque to 19 ft–lb (25 N.m). Use two wrenches to
maintain the alignment mentioned in Step 3.
8. Stack the male gland (21 1*), packings (218* –lips
down ) and female gland (212*), one at a time into the
top of the cylinder. See Fig 37–1.
9. Install the packing nut (221) and plug (201), but leave
loose for now.
10. Insert the piston rod (223) through the bottom of the
pump cylinder. See Fig 37–1.
DISPLACEMENT PUMP REPAIR
APPLY ONE DROP
OF SEALANT TO
THESE THREADS
MAINTAIN
ALIGNMENT
THROUGH
STEPS 3 TO 7
223
MAINTAIN ALIGNMENT
THROUGH STEPS 3 TO
7
11. Screw down the cylinder locknut (238) until it is finger
tight at the bottom of the external cylinder threads.
12. Place the flats of the intake valve in a vise. Assemble
the intake valve using a new gasket (206*) and screw
the pump cylinder onto the valve.
Torque to 80 ft–lb (107 N.m).
13. Tighten the packing nut (121) just enough to stop leak-
age, but no tighter. Fill the wet–cup/packing nut 1/3
full with Graco TSL.
14. See Reinstalling the Pump, on page 36.
223
201
65
*212
*211
*203
216
214
*213
*220
205*
LIPS FACE
DOWN
*219
224
*207
*204
222
TORQUE TO
80 ft–lb
(107 N.m)
Fig 37–1
See Fig 37–1.
DETAIL OF
THROAT
PACKINGS
218*
PLASTIC
LIPS OF
V–PACKING IN
THROAT
MUST FACE
DOWN
DETAIL OF
PISTON
PACKINGS
217*
PLASTIC
LIPS OF
V–PACKING IN
PISTON MUST
FACE UP
206*
215
307–958