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306746
Displacement Pump Service
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 8.
1.
Solvent flush the fluid from the pump, if possible;
then relieve the air and fluid pressures according
to the
Pressure Relief Procedure
on page 8.
Disconnect the hoses, remove the pump from its
mounting, and clamp in a vise.
NOTE:
Packing repair kits 207158 (for 24:1 pump) and
207159 (for 48:1 pump) are available. Use all the new
parts, even if the old ones still look good, for the best
results.
2.
Unscrew the coupling nut (22) from the stud (24)
and the stud from the displacement rod (33 or 59).
Loosen the setscrews (40) in large locknuts (45)
and remove the locknut from the large mounting
tubes (P). See Fig. 4. If the mounting tubes are to
be replaced, wrench the tubes close to the air
motor base as shown in Fig. 4 to prevent thread
damage.
Fig. 4
TI1811A
1
Q
22
24
49, 53, 66
25
P
45
40
3.
Unscrew the booster cylinder (34 or 61) from the
pump housing (11) and pull the booster rod (35),
intake valve assembly, and displacement rod from
the bottom of housing.
4.
Unscrew the locknuts (44, 45), remove the priming
piston (26 or 58) from the booster rod, and pull the
intake valve from the booster rod. See Fig. 5. If the
valve is seized in the housing, squirt penetrating oil
around threads and gently tap around housing with
a hammer to loosen.
5.
Remove the wet–cup (25), unscrew the packing
nut (36 or 60), and remove the o–ring (19), pack-
ings (31**, 32**, or 62**, 63**), and the backup
(62**) from the throat cavity. See Fig. 5.
6.
Clean and inspect all parts for wear or damage
and replace as necessary.
7.
Reassemble pump in reverse order of disassem-
bly, making sure all parts are installed correctly,
and that all threaded connections are tightened
securely.