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Service
Repair Kits
Pump seal kits are available for each pump size.
Throat packing kits are also available. Refer to page
45 to order.
Parts supplied in the pump seal kit are marked with
one asterisk in the text and drawings, for example (2*).
Parts supplied in the throat packing kit are marked with
a symbol, for example (19{). For the best results, use
all the parts in the kit.
Disassembling the Displacement Pump
1. Remove the pump from the motor as explained on
page 22.
2. Secure the displacement pump intake housing (10)
in a vise.
3. Refer to Fig. 13. Loosen but do not remove the
packing nut (21) and the cartridge (38, used on
stainless steel pumps only).
4. Remove the four capscrews (9) and washers (8)
from around the pump outlet housing (22).
5. Remove the outlet housing (22), balls (23), seats
(24) and gaskets (7).
6. Remove the three tie bolts (13) and lockwashers
(14). Lift off the upper pump housing (1), along
with the fluid tubes (3), cylinder (4), and piston
assembly (16).
7. Remove the packing nut (21). On stainless steel
pumps only, remove the throat cartridge (38) and
o-ring (39).
8. Remove the glands (19, 26) and packings (20, 25).
NOTE: Model 239859, 239860, 240612, and 240613
displacement pumps use 8 v-packings (20) in
the throat, instead of 5 UHMWPE (20) and 3 leather
(25) as on all other models.
9. Remove the tubes (3) and cylinder (4) from the
housing (1). Pull the piston assembly out of the
cylinder.
10. Remove the intake housing (10) from the vise.
11. Remove the four capscrews (9) and washers (8)
from the intake housing (10). Use a flatblade
screwdriver inserted between the lower pump
housing (11) and the intake housing (10) to sepa-
rate them.
NOTE: One intake seat (6) includes a pressure relief
valve (V). This seat must be located exactly where
shown (the left side as viewed in Fig. 13).
12. Remove the balls (5), intake seats (6 and 34), and
gaskets (7).
13. Inspect the pressure relief valve in the seat (6) to
make sure it is not clogged. Press down on the
valve’s ball (B) to see if the ball and the spring (S)
are free to move. See Fig. 12.
CAUTION
If the pressure relief valve in the seat (6) is clogged
or filled with material, soak the seat in a compatible
solvent. Make sure all material residue is cleaned
from the ball and seat area.
If the relief valve cannot be thoroughly cleaned so
that the ball and spring are free to move, replace the
seat (6).
14. Place the flats of the piston nut (12) in a vise.
Unscrew the rod (17) from the nut. Disassemble
the piston (16) and remove the seal (15).
7523B
Fig. 12
6
B
S
11
10
Cleaning and Inspecting Parts
Clean all parts in a compatible solvent. Inspect all
parts for wear or damage. If you are using a repair kit,
use all the new parts in the kit, discarding the old ones
they replace. Replace any other parts as needed.
Worn or damaged parts may cause the pump to per-
form poorly or cause premature wear of the new seals
and packings.
