34
DISPLACEMENT PUMP REPAIR
WARNING
Before doing this procedure, follow the
Pressure
Relief Procedure Warning
on page 22 to reduce
the risk of a fluid injection injury , splashing in the
eyes or on the skin, injury from moving parts or
electric shock.
Unplug the sprayer!
NOTE:
Packing Repair Kit 222–588 is available. In the
text and drawings, reference numbers with an as-
terisk, i.e., (210*), indicate the parts included in
the repair kit. For the best results, use all the new
parts in the kit, even if the old ones still look good.
Fig 34–1
65
63
26
223
224
*202
204*
219
220
*221
DETAIL OF
INTAKE VALVE
67
29
NOTE: DRIVE HOUSING
COVER REMOVED ONLY
FOR VISUAL PURPOSES.
57
31
66
Removing the Pump
Refer to Fig 34–1.
1. Flush the pump, if possible, and relieve pressure
again. Stop the pump with the piston rod (224) in its
lowest position, if possible.
2. Hold the wrench on the pump intake valve (223) to
keep the pump from loosening and remove the suc-
tion tube (57).
NOTE
: If repairing only the intake valve assembly, go to
Disassembling the Pump
, Steps 1 and 2.
3. Remove the hose (26) from the nipple (67).
4. Push the retaining spring (65) up. Push out the pin
(63).
5. Loosen the locknut (31) and unscrew the pump from
the bearing housing (66).
Disassembling the Pump
1. Unscrew the intake valve (223) from the
cylinder
(219). Remove the o-ring (202), ball guide (220), stop
pin (221) and ball (204) from the valve.
Refer to Fig
34–1.
2. Clean and inspect the parts for wear or damage, re-
placing parts as needed. Always use the new o–ring
included in the Repair Kit. If no further service is need-
ed, reassemble the intake valve.
3. Remove the packing nut (216) and plug (205).
Refer
to Fig 35–3.
4. Use a plastic mallet to tap the piston rod (224) down,
then pull the rod out through the bottom of the
cylinder.
5. Remove the throat packings (207, 213) and glands
(208, 209).
Refer to Fig 35–3.
NOTE:
Whenever you disassemble the pump for clean-
ing or repair, remove the sleeve. A special sleeve
removal tool is available. Order Graco Part No.
222–586. Do not use any other type of tool.
Always use the special
sleeve removal tool to re-
move the sleeve. Other
removal methods could
cause the pump to rup-
ture, resulting in serious
bodily injury. If the sleeve
cannot be removed easi-
ly using the tool, return
the sleeve and cylinder to
your Graco distributor for
removal.
WARNING
6. Screw the large nut (B) of
the tool into the top of the
cylinder (19). Screw
down the rod (A) to push
the sleeve out. Remove
the tool.
Refer to Fig
34–2.
7. Clamp the flats of the piston rod in a vise. Loosen the
retaining nut (211). Unscrew the piston valve (222)
from the rod. Remove all parts from the piston valve
(222).
Refer to Fig 35–1.
Reassembling the Pump
NOTE:
Alternate leather and plastic packings as shown
in Fig 35–1. The lips of the throat “V” packings
must face down, against pressure. The lips of the
piston “V” packings must face up, against pres-
sure. The lips of the U–cup seal (203) face down.
Incorrect installation damages the packings and
results in pump leaking.
NOTE:
Soak leather packings in oil before using them.
1. Check the outside of the piston rod (224) and the in-
side of the sleeve (218) for scoring or scratches. If
these parts are damaged, new packings will not seal
properly. Replace these parts if needed.
2. Stack the backup washer (214), seal (203*), female
gland (215*), alternate the packings (212*,206*), and
then male gland (210*) onto the piston valve (222).
Refer to Fig 35–1.
Fig 34–2
219
B
A
