36
307–785
DISPLACEMENT PUMP REPAIR
WARNING
Before doing this procedure, follow the Pressure
Relief
Procedure W
arning
on page 24 to reduce
the risk of a fluid injection injury , splashing in the
eyes or on the skin, injury from moving parts or
electric
shock.
NOTE: Packing Repair Kit 222–588 is available. In the
text and drawings, reference numbers with an
asterisk, 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
36–1
69
42
43
47
70
23
24
*202
204*
219
220
*221
DETAIL
OF
INT
AKE V
ALVE
40
86
Removing the Pump
Refer to Fig 36–1.
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 (86).
NOTE:If
repairing only the
intake valve assembly
, go to
Disassembling
the Pump
, Steps 1 and 2.
3.
Remove the hose (70) from the nipple (40).
4. Push the retaining spring (42) up. Push out the pin
(43).
5. Loosen
the locknut (47) and unscrew the pump from
the
bearing housing (69).
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
36–1.
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 ne
-
eded,
reassemble the intake valve.
3. Remove
the packing nut (216) and plug (205).
Refer
to
Fig 37–3.
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 37–3.
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
36–2.
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 37–1.
Reassembling the Pump
NOTE: Alternate
leather and plastic packings as shown
in Fig 37–1. The lips of the throat “V” packings
must face down, against pressure. The lips of
the piston “V” packings must face up, against
pressure. The lips of the U–cup seal (3) face
down. Incorrect installation damages the pack-
ings
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 37–1.
Fig 36–2
219
B
A
To Next Page
Loading...
