Graco A Series Instructions Manual page 5

Disassembly
NOTE: Packing Repair Kit 220–395 is available for
Model 217–527. See the parts list on page 7. For the
best results, use all the new parts in the kit, even if the
old ones look good. An asterisk behind a reference
number, for example (9*), indicates that this part is in-
cluded in the repair kit. For Model 237–406, keep the
parts marked with a check (9 ) on hand to reduce
downtime. Refer to the parts list on page 7.
1. Solvent flush the pump, if possible. Follow the
Pressure Relief Procedure on page 2, then dis-
connect all hoses from the pump.
2. Loosen the packing nut (2). Disconnect the dis-
placement pump from the motor (see your sepa-
rate pump manual).
3. Screw the intake valve housing (4) out of the pump
housing (1). See Fig. 1. Note which set of holes
the ball stop pin (11) is in, then disassemble and
clean the parts of the valve.
4. Push down on the displacement rod (22) until the
piston (3) flats clear the pump housing (1). Pull the
piston and displacement rod assembly straight out
of the pump housing, being careful not to damage
the rod or housing.
5. Unscrew the piston, and remove the ball, washer,
v-packings and glands.
6. Remove the packing nut/wet-cup (2). Remove the
v-packings and glands from the pump throat.
7. Clean all parts thoroughly, and check for wear,
scratches or other damage. Be sure the ball seats
of the piston (3) and intake valve housing (4) are
not chipped or nicked. Replace any worn or dam-
aged parts to ensure that the pump will not leak.
Scoring or irregular surfaces on the displacement
rod (22) or polished inner wall of the sleeve (14)
can cause premature packing wear and leaking.
Check these parts by rubbing a finger on the sur-
faces or by holding the parts up to the light at an
angle. If either is worn or scratched, replace it.
NOTE: If replacing the sleeve, be sure to install it with
the tapered end down toward the pump inlet, and also
replace the gasket (15*). If the sleeve is hard to re-
move, contact Graco Technical Assistance (see back
page).
Service
MODELS 217–527 & 237–406
Fig. 1
See detail in Fig. 2.
See detail in Fig. 3.
Apply thread sealant and torque to
150–175 ft–lb (203–237 N.m).
Torque to 80–100 ft–lb (108–136 N.m).
*29
1
*15
14
*6
12
11
13
2
22
16
29*
3
9*
7*
4