Graco EM 5000 Instructions-Parts List Manual page 33

4. To disassemble the rest of the pump, remove the
packing nut (416) and plug (405). See Fig. 43.
5. Use a plastic mallet to tap the piston rod (424) down.
Pull the rod out through the bottom of the cylinder.
6. Remove the throat packings. See Fig. 43.
WARNING
Always use the special removal tool, P/N 220–991,
to remove the sleeve. Other removal methods
could cause the pump to rupture, resulting in
serious injury. If the sleeve cannot be removed
easily using the tool, return the sleeve and cylinder
to your Graco distributor for removal.
7. Remove the sleeve. Screw the large nut (B) of the
tool into the top of the cylinder (419). Screw down the
rod (A) to push the sleeve out. Remove the tool. See
Fig. 39.
8. Clamp the flats of the piston rod (424) in a vise. Loos-
en the retaining nut (411). Unscrew the piston valve
(422). See Fig. 40.
9. Disassemble the piston valve (422). See Fig. 40.
Fig. 39
Reassembly Notes
A. Pump Repair Kit, P/N 220–877, is available. For the
best results, use all the new parts in the kit, even if
the old ones still look good. Parts included in the kit
are shown with an asterisk, i.e., (410*) in the text and
drawings.
B. Check the outside of the piston rod (424) and the in-
side of the sleeve (418) for scoring or scratches. If
the parts are damaged, new packings will not seal
properly. Replace these parts if needed.
Displacement Pump
A
B
419
0028
C Alternate leather and plastic packings as shown in
Fig 31–2. The lips of the throat "V" packings must
face down. The lips of the piston "V" packings must
face up. The lips of the U–cup seal (403) face down.
Incorrect installation damages the packings and
causes the pump to leak.
D. Soak leather packings in oil before reassembling the
pump.
Reassembly Procedure
1. Stack the backup washer (414), seal (403*), female
gland (415*), alternate the packings (412*,406*), and
then male gland (410*) onto the piston valve (422).
See Fig. 40.
2. Tighten the packing retaining nut (411) onto the pis-
ton valve (22) to the torque specified in Fig. 40.
3. Put the ball (425*) on the piston valve (422). See
Fig. 40.
CAUTION
Step 5., tightening the piston valve into the rod, is
critical. Follow the procedure carefully to avoid
damaging the packings by overtightening.
4. Apply one drop of adhesive, supplied, to the threads
of the piston valve. Then hand tighten the valve as-
sembly into the piston rod just until the nut (411) con-
tacts the rod. See Fig. 40.
Note the alignment of the piston (422) to the nut
(411). Maintain this alignment through Steps 5., 6.
and 7..
5. Place the flats at the top of the rod (424) in a vise.
411
TORQUE TO
0.35 N.m
*406
2 LEATHER
*412
3 POLY
LIPS FACE UP
*414
Fig. 40
424
425*
APPLY ONE DROP
OF SEALANT TO
THESE THREADS
410*
415*
403* LIPS
FACE
DOWN
422
0029