Graco Dyna-Star 224741, Instructions Manual

Page: 13 / 28

Repair
308155U 13
Reciprocator Repair
NOTE:
• The following reciprocator repair instruction are for
models 239882, 224741, and 224742. For Model
237653 instructions, see accompanying manual
307654.
• Clean and inspect all parts for wear or damage.
Replace parts as needed. For the best results,
always replace all the o-rings and seals when you
disassemble the pump. Repair Kit 223426 is avail-
able.
• Assembly tool 189305 is required for reassembling
the reciprocator.
• Loctite
®
242 thread sealant and Loctite
®
Primer T or
Perma-Loc
®
115 thread sealant and Perma-Bond
®
Surface Conditioner 1 are required. Be sure their
self life is within the manufacturer’s recommenda-
tions.
NOTE: Use Loctite
®
609 on yoke (9) and rod (12) on
page 14, step 9 only. Use Loctite
®
242 or Perma-Loc
®
115 on other threaded surfaces as required.
Before you begin, drain the oil out of the reciprocator as
follows: Place the reciprocator in a drain pan, push the
piston all the way up/in, then all the way down/out.
1. Place the adapter (43) in a vise. Remove the four
capscrews (46) and the base (33). Pull the bottom
cap (32) off the adapter. See F
IG
. 8. If needed,
replace the seals as described in Repair on page
11.
2. Remove the capscrew (3), nuts (36), and lockwash-
ers (37) on top of the reciprocator. (F
IG
. 8)
3. Loosen both nuts on the fluid tube (45). Use a
wrench to rotate the tube fittings (1, 58) to the side,
and remove the tube (45). Check the o-rings (1a,
58a) on the fittings, and replace them if they are
worn or damaged. Install plugs in the fittings to pre-
vent contamination. (F
IG
. 4 and F
IG
. 5)
NOTE: See F
IG
. 10 for Steps 4 to 12, except where
noted.
4. Tap on the bottom of the displacement rod (34) with
a plastic mallet to loosen the cylinder (25).
5. Grasp the spool valve assembly (31), and pull it off
the cylinder and tie rods (38). Pull the cylinder and
piston off the bottom cap (32). It is not necessary to
remove the tie rod from the bottom cap.
6. Lay the assembly on its side. Place a clean rag
around the yoke (9) to prevent losing the detent
balls. Slide the yoke sideways off the valve sleeve
(29) while holding the balls (7) and spring (6) in
place.
7. Slide the cylinder (25) off the displacement rod (34).
Hold the hex end of the displacement rod in a vise,
and use a spanner wrench in the pin holes of a pis-
ton (22) to screw it off the rod.
NOTE: Be careful not to scratch the outside of the dis-
placement rod or the inside of the cylinder.
8. Visually inspect the spring (21) if there is wear or
damage, proceed with this step. Remove the nut
(18), spring (21), and retainers (20) from the trip rod
F
IG
. 8
43
36,37
33
32
3,39,2
46
(hidden from
view)