Graco Dura-Flo 2400 Instructions-Parts List Manual page 22

Displacement Pump Service
Disassembly
When disassembling the pump, lay out all the removed
parts in sequence, to ease reassembly. Clean all parts
with a compatible solvent and inspect them for wear or
damage. Refer to Fig. 7.
NOTE: Repair Kits are available to replace the throat
(T) and piston (P) packings, and to replace the o-rings
and cylinder seals. For the best results, use all the new
parts in the kit. Kit parts are marked with an asterisk,
for example (11*). These kits can also be used to
convert the pump to different packing materials. Refer
to pages 32 through 35.
NOTE: Standard Displacement Pump 222803 and
optional displacement pumps 222994 and 241648 use
stainless steel capscrews (20) with washers (36).
Optional Pumps 222993, 236226, and 236230 use
carbon steel cap screws and do not include washers.
1. Stand the displacement pump upright in a large
vise. Loosen, but do not remove the packing nut
(3). Remove the six long cap screws (20) and
washers (36, if present), using a socket wrench.
2. Lift the outlet housing (19) straight up off the
pump. Be careful not to scratch the displacement
rod (1) while removing the housing.
3. Lift the cylinder (7), displacement rod (1), and
piston assembly off the intake housing (17).
4. Remove the seal (6), ball guide (14), intake ball
(16), intake seat housing (15), and o-ring (8) from
the intake housing (17). Inspect the ball (16) and
the ball seat (A) on the housing (15) for wear or
damage.
5. Remove the seal (6) from the bottom of the outlet
housing (19). Unscrew the packing nut (3). Re-
move the glands and v-packings (T) from the
housing. Do not remove the outlet fitting (4) and
o-ring (5) unless they need replacement.
6. Unscrew the bleeder valve plug (35) completely
from the valve body (34). Clean the valve threads
and the bleed hole. It is not necessary to remove
the valve body from the pump outlet housing (19).
7. Stand the cylinder (7) upright on a wooden block.
Using a rubber mallet or an arbor press, drive the
displacement rod (1) and piston assembly down
into the cylinder as far as possible, then place the
cylinder on its side and continue to drive the rod
out the bottom until the piston comes free. Pull the
rod and piston from the cylinder, being careful not
to scratch to rod or cylinder.
22 308152
Service
To reduce the possibility of costly damage to the rod
(1) and cylinder (7), always use a rubber mallet or an
arbor press to drive the rod out of the cylinder. Be
sure to place the cylinder on a soft block of wood.
Never use a hammer to drive the rod.
NOTE: Service Tool 109508 is available as an acces-
sory. The tool fits over the top of the displacement rod
(1), making it easier to apply a 24 inch adjustable
wrench or 3/4 in. drive socket when disconnecting the
rod from the piston assembly.
8. Put the flats of the piston seat housing (12) in a
vise. Unscrew the rod (1) from the housing (12),
leaving the ball guide (9) assembled to the rod. Be
careful to catch the piston ball (10) as you sepa-
rate the housing (12) and ball guide (9), so that it
doesn't fall and suffer damage.
9. Remove the glands and v-packings (P) from the
piston seat housing (12). Inspect the ball (10) and
ball seat (B) on the housing (12) for wear or dam-
age.
10. Inspect the outer surface of the displacement rod
(1) and inner surface of the cylinder (7) for scoring
or wear; replace either part if necessary. If the rod
is being replaced, remove the ball guide (9) as
explained in step 11.
NOTE: Do not remove the ball guide (9) from the
displacement rod (1) unless either part is damaged.
11. Place the flats of the ball guide (9) in a vise. Using
a 24 in. adjustable wrench or 3/4 in. drive socket,
unscrew the rod (1) from the ball guide.
CAUTION