Repair
24
3A3169E
d.
Install nut (5) over the end of the piston rod (13).
Use two wrenches, working in opposite direc-
tions to tighten the nut. Secure one open end
wrench to flats of piston rod and use the second
wrench to tighten the nut (5) as shown in F
NOTE:
The open end wrench secured to the
flats of the piston rod is only used to hold the
rod securely, do
not
rotate this wrench. Moving
this wrench could scratch or damage the sur-
face of the piston and cause fluid leaks during
the pump operation. Only move the wrench
holding the nut (5) to tighten the nut. Torque nut
to 15 to 17 ft. lbs (20.3 to 23.1 N•m).
e.
Apply a thin layer of grease to o-ring (7). Install
o-ring (7) around piston (6) as shown in F
. 52.
f.
Apply a thin layer of grease around and along
the entire length of the piston rod (13). Gently
push the piston rod into the pump base (1)
using a push and turn motion to work the rod
through the previously installed, seals and spac-
ers (F
. 53).
9.
Air Cylinder
a.
Use a clean cloth to wipe inside the air cylinder
(2) and remove any dirt or contaminants.
b.
Apply a thin layer of grease to the inside sur-
faces of the air cylinder (2). Slide the air cylinder
(2) over the piston (6) and push it all the way
down until it is seated tightly to the pump base
(1). See F
Make sure the Graco G in the air cylinder is fac-
ing out.
F
IG
. 51
F
IG
. 52
13
6
5
7
6
F
IG
. 53
F
IG
. 54
13
1
2
6
1
