Graco EM 380 Instructions-Parts List Manual page 5

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Unscrew and remove packing nut (70). Using a rubber
' 1
'.
Assembling Pump
.'
' '
mallet.
tao niston rod (791 down and uull out through
When assembling pump, coat packings, piston rod and
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.
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,
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~.
bottom of cylinder 1781. See Fig
3
and4.
~~
~~.
~"
-
inside of cylinder
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with hydraulic oil.
Remove glands
(66
& 69) and packings
(67
b
68).
When reassembling piston, i n e l l new glands and pack-
ings in correct order, altematmg leather and plastic
Clean and inspect piston rod and inside of cylinder for packings. See Fig
3. "V"
of packings must face up
nicks, scratches or scoring which could cause leaking or against
fluid pressure. See Fig 4. Tighten nut (65) to
premature wear of packings. 10.5 in-lb (1.2 N.m) to seat packings, then back off and
tighten hand tight.
Clamp
flats of
piston rod in a vise. Use a large
screwdriver to unscrew adapter
(76)
from valve (81).
Remove seal (61) and washers
(77).
See Fig
3
and 4.
Place new ball in piston rod (79). Apply, locking corn-
ing a torque wrench on nut 165) and a screwdriver on
pound to threads of valve 181
1.
and screw
It
into rod. Us-
Use a wrench to loosen nut
(651
and unscrew valve (81)
valve (81). tighten nut against piston rod to 18-29 ft-lb
from piston rod. Remove ball (59). Remove nut, glands
(24-27 N.m) torque, without changing the tightness of
(62 & 64) and packings ( 6 3 & 75).
the nut against packings.
L
Install new seal and washers on adapter 176) and screw
into valve (81).
Install throat packings. glands and packing nut, leaving
packing nut loose. "V" of packings must face down
against fluid pressure. Put plastic packing (68) on top of
lnseipiston rod through bottom of pump cylinder.
Assemble and install intake valve and tighten packing
nut just enough to stop leakage
-
no
tighter.
'
".:
leather packings.
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L