Graco 253017 Instructions-Parts List Manual page 15

Piston Rod Packing Service
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
1. If air leaks around the piston rod packing nut (46),
tighten the nut. If the air leak continues, relieve
the pressure and continue as follows.
2. Remove the four nuts (37) and lockwashers (36)
holding the support beam (3) to the rod (68), and
remove the support beam. Screw the packing nut
(46) out of the housing (70) and slide it up off the
rod (68). See Fig. 9.
3. Remove the bearing (49), female gland (42),
packings (47), male gland (43) and spring (44) and
slide them up off the rod (68).
4. Inspect the parts for wear or damage. Replace as
necessary.
5. Slide the spring (44) and male gland (43) onto the
rod (68). Lubricate the packings (47) and slide
them onto the rod one at a time, with the lips
facing down. Slide the female gland (42) onto the
rod and push all of the packings into the housing
(70). Slide the bearing (49) onto the rod.
6. Slide the packing nut (46) onto the rod (68) and
screw it into the housing (70). Tighten just snug;
do not overtighten or the packings may be dam-
aged.
7. Reinstall the support beam (3) on the rods (68),
using the nuts (37) and lockwashers (36).
Service
Ram Piston Service
NOTE: Some older series of Model 207279 Ram use
a different piston assembly than current models. For
Series A through H of Model 207279, order Repair
Kit 220501. This kit is also necessary to convert the
ram from air to hydraulic operation. See page 29 for
parts.
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
1. Relieve the pressure.
2. Remove the support beam (3) as explained under
Piston Rod Packing Service.
3. Remove the cylinder cap (67) and slide it up off the
piston rod (68). Loosen the packing nut (46) and
carefully slide the packing nut, bearing (49), and
housing assembly (70) up off the rod. See Fig. 9.
4. Carefully pull the piston rod (68) straight up out of
the cylinder (2). If the rod is cocked to one side,
the piston or inside surface of the cylinder could be
damaged.
5. Carefully lay the piston and rod down so the rod
will not be bent. Remove the piston retainer
nut (37), washer (36), piston (78), outer piston
seal (54), inner piston seal (41) and spring (52).
6. Install the piston seals (41 and 54) on the
piston (78) and lubricate the piston and seals.
Reinstall the spring (52), piston (78), washer (36)
and nut (37) on the piston rod (68).
7. Carefully insert the piston into the cylinder (2) and
push the rod (68) straight down into the cylinder.
Slide the housing, bearing (49), and packing nut
(46) down onto the piston rod (68). Tighten the
packing nut just snug; do not overtighten or the
packings may be damaged.
8. Reinstall the cylinder cap (67) and beam (3).
WARNING
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