308155 23
Displacement Pump Repair
(Model 237653)
Disassembly
When disassembling the pump, lay out all removed
parts in sequence, to ease reassembly. See Parts
Drawing on page 25.
NOTE: Clean all the parts thoroughly when
disassembling. Check them carefully for damage or
wear, replacing parts as needed.
1. Remove the displacement pump from the
reciprocator as explained on page 13.
2. Unscrew the locking ring (17) from the cylinder
(11). Remove the intake valve housing (13).
3. Remove the o-ring (12), ball stop pin (5), ball guide
(22) and ball (2) from the intake valve housing
(13).
4. Loosen the packing nut (15). Push the
displacement rod (7) down as far as possible, then
pull it out the bottom of the cylinder (11).
5. Secure the flats of the piston (14) in a vise. Using
a wrench on the flats of the piston mounting stud
(28), screw the piston stud off the piston.
6. Remove the piston packings (25, 26), glands (24,
27), shim (29), and washer (23).
7. Remove the packing nut (15), throat packings (9,
19) and glands (6, 8) from the outlet housing (16).
8. Inspect all parts for damage. Clean all parts and
threads with a compatible solvent before
reassembling. Inspect the polished surfaces of the
displacement rod (7) and cylinder (11) for
scratches, scoring or other damage, which can
cause premature packing wear and leaking. To
check, run a finger over the surface or hold the
part up to the light at an angle. Be sure the ball
seats of the piston (14) and intake valve housing
(13) are not chipped or nicked. Replace any worn
or damaged parts.
Reassembly
1. Lubricate the throat packings and install them in
the outlet housing (16) one at a time as follows,
with the lips of the v-packings facing down: the
male gland (6*), two neoprene v-packings (9*), one
UHMWPE v-packing (19*), and the female gland
(8*). Apply thread lubricant and install the packing
nut (15) loosely.
2. Lubricate the piston packings and install them onto
the piston stud (14) one at a time in the following
order, with the lips of the v-packings facing up: the
female gland (27*), one UHMWPE v-packing (25*),
one neoprene v-packing (26*), one UHMWPE
v-packing (25*), the male gland (24*), the shim
(30), and the washer (23*).
3. Place the flats of the displacement rod (7) in a
vise, screw the piston stud (14) onto the
displacement rod, and torque to 50–70 ft–lb
(68–95 N.m).
4. Slide the ball stop pin (10*) into the desired set of
holes, and secure with the new cotter pins (1*).
Install the piston ball (2*) in the piston mounting
stud.
5. Screw the piston stud (14) onto the piston
mounting stud (28), and torque to 50–70 ft–lb
(68–95 N.m).
6. Insert the displacement rod (7) into the top of the
cylinder (11), being careful not to scratch the
cylinder. Insert only until the packings are in the
cylinder.
7. Lubricate the o-ring, and apply thread lubricant to
the cylinder, then reinstall the cylinder in the outlet
housing (16).
8. Install the ball (2*), guide (22), o-ring (12), and ball
stop pin (5*) in the intake valve housing (13). Place
the intake valve assembly in the cylinder (11).
Apply thread lubricant to the locking ring and
cylinder (11), and screw the ring onto the cylinder.
9. Reconnect the displacement pump to the
reciprocator by performing the reverse of the
disassembly procedure on page 13 (see Fig. 6 on
page 13 ).
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