Graco Roof Rigs 224483 Instructions-Parts List Manual page 20

Repair Kit
1 A Packing Repair Kit, Part No. 224–523, is available.
Use all the parts in the kit for the best results.
2 Parts included in the kit are marked with an asterisk
in the text and drawings. For example, 408*.
Reassemble the pump
NOTE: Refer to Fig. 13 for reassembly except where
noted.
NOTE: Grease all packings and o–rings before installing
them.
1. Install the ball guide (409), ball (411*) and intake
housing (410) in the lug nut (421).
2. Place new o–rings (404*) on the cylinder (405).
3. On the piston seat (422), install the u–cup seal
(408*), lips down. Install the female gland (412*).
With the lips of the v–packings facing up, alternately
install the leather (407*) and poly packings (413*). In-
stall the male gland (406*).
4. Install the nut (414) on the piston seat (422). Hand
tighten the nut very firmly.
NOTE: If you disassembled the piston rod (401) and pis-
ton housing (416), clean the threads thoroughly.
Apply red Loctite
(47–68 N.m).
5. Apply Loctite green (supplied in the repair kit) to the
piston seat (422) threads. Install the ball (415*).
CAUTION
Before assembling the piston, not that the top of the
piston seat (422) has four flutes (B) and that the
piston housing (416) has four holes (A). Together
these flutes and holes provide the fluid flow path.
Failure to align the parts properly, as instructed in
Step 6, will result in poor pump performance.
6. Back off the piston housing just until the holes and
flutes (B) mentioned in the CAUTION are perfectly
aligned, and the tips (B) are not visible when you look
through the holes (A). See Fig 20–1. Screw the pis-
ton housing (416) down to the nut (414) and torque
to 90–125 ft–lb (122–170 N.m).
Displacement Pump
and torque to 35–50 ft–lb
7. From the top of the pump housing (417), install the
male gland (403). With the lips of the v–packings fac-
ing down, alternately install the leather packings
(418*), and poly packings (402*). Install the female
gland (419*).
8. Screw in the packing nut (420) loosely. It will be tight-
ened after the pump is installed and operating.
9. Grease the o–rings on the cylinder (405). Slide the
cylinder into the bottom of the pump housing (417).
10. Grease the piston rod (401) and piston packings.
Slide the piston rod assembly into the bottom of the
cylinder so it extends out of the piston housing 2–3
in. (50–75 mm). Be careful not to damage any pack-
ings.
11. Align the holes in the top of the piston rod with the
pump outlet.
NOTE: If you push the piston rod too far out of the pump
housing, using a hard rubber mallet (ONLY!) to
tap it down.
If the piston rod does not extend out far enough,
remove the foot valve and tap the piston up.
12. Install the intake valve housing and tighten firmly.
13. Install the pump and prime it. Check the packing nut
(20) and tighten it just enough to prevent leakage.
HOLE
FLUTE
TIP
Fig. 16
416
422
0552