Repair
308116V
15
Disassemble the Displacement
Pump
NOTE:
When disassembling the pump, lay out removed
parts in sequence to ease reassembly. Clean all parts
with a compatible solvent and inspect them for wear or
damage. Refer to Fig 5.
NOTE:
Standard Repair Kit 224401 (UHMWPE/PTFE
packings) is available. For the best results, use all the
new parts in the kit. Parts included in the kit are
denoted with one asterisk, for example (3*).
NOTE:
Conversion Kit 224889 is available to convert
the pump to all PTFE packings. See page 19 for details.
NOTE:
Clean all the parts thoroughly when
disassembling. Check them carefully for damage or
wear, replacing parts as needed.
Disconnect the Displacement Pump
procedure, page 13.
2. Unscrew the locking ring (7) from the cylinder (8).
See Fig F
. 3. Remove the intake valve housing
(15).
3. Remove the o-ring (12), ball stop pin (6), ball guide
(9) and ball (4) from the intake valve housing (15).
4. Loosen the packing nut (2). Push the displacement
rod (13) down as far as possible, then pull it out the
bottom of the cylinder (8).
5. Secure the flats of the displacement rod (13) in a
vise. Use a wrench on the flats of the piston
mounting stud (28) to screw the piston off the rod.
6. Remove one cotter pin (3) and the ball stop pin (21),
taking note which set of holes it is in. Remove the
ball (4).
7. Place the flats of the piston mounting stud (28) in a
vise, and unscrew the piston stud (26). Remove the
piston packings (20, 23), glands (25, 27), washer
(19), and shims (31).
8. Remove the packing nut (2), throat packings (5, 24),
and glands (11, 14) from the outlet housing (1).
9. Inspect all parts for damage. Clean all parts and
threads with a compatible solvent before
reassembling.
10. Inspect the polished surfaces of the displacement
rod (13) and cylinder (8) 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 (26) and intake
valve housing (15) are not chipped or nicked.
Replace any worn or damaged parts.
Assemble the Displacement
Pump
NOTE:
On UHMWPE/PTFE packed pumps, the packing
order is one UHMWPE packing, two PTFE packings,
and one UHMWPE packing. On PTFE packed pumps,
all four packings are PTFE.
1. Lubricate the throat packings and place them in the
outlet housing (1) in the following order, with the
lips of the v-packings facing down (see F
. 3 on
page 17):
- male gland (11*),
- v-packings (24* or 5*)
- female gland (14*).
2. Apply thread lubricant and install the packing nut
(2) loosely.
3. If you removed the cylinder (8), apply thread
lubricant and reinstall it in the outlet housing (1),
making sure to replace the o-ring (10).
4. Install shims (31*) onto the piston stud (26) as
required to eliminate end play.
5. Lubricate the piston packings and place them on
the piston stud (26) in the following order, with the
lips of the v-packings facing down:
- female gland (25*)
- v-packings (23* or 20*)
- male gland (27*)
- washer (19*).
6. Apply thread sealant and screw the piston stud (26)
onto the piston mounting stud (28). Torque to 50-70
ft-lb (68-95 N•m).
7. Install the piston ball (4*) on the piston seat. Slide
the ball stop pin (21*) into the desired set of holes,
and secure with the cotter pin (3*).
