Clean And Inspect Parts; Lower Reassembly - Graco A Series Instructions And Parts List

Repair
CAUTION
If the pressure relief valve in the seat (6) is clogged or
filled with material, soak the seat in a compatible sol-
vent. Make sure all material residue is cleaned from
the ball and seat area.
If the relief valve cannot be thoroughly cleaned so that
the ball and spring are free to move, replace the seat
(6).
14. Place the flats of the piston nut (12) in a vise.
Unscrew the rod (17) from the nut and spacer. Dis-
assemble the piston (10) and remove the seal (11).

Clean and Inspect Parts

Clean all parts in a compatible solvent. Inspect all parts
for wear or damage. If you are using a repair kit, use all
the new parts in the kit, discarding the old ones they
replace. Replace any other parts as needed. Worn or
damaged parts may cause the pump to perform poorly
or cause premature wear of the new seals and packings.

Lower Reassembly

1. Place the halves of the piston (10) around the pack-
ing (11) and snap them together. See F
2. Apply thread sealant (Loctite
piston rod (17) threads. Screw the rod through the
piston, packing, and spacer and into the piston nut
(12). Torque the nut to 95-100 ft-lb (129-135 N•m).
Allow to cure for at least 12 hours before use.
3. With the lower pump housing (11) turned upside
down, install the balls (5) and the gaskets (7*).
COMPONENT RUPTURE HAZARD
The relief valve seat (6) must be installed at the fluid
intake, as shown in F . 8. The relief valve reduces the
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risk of pump overpressurization. The seat cannot
relieve pressure if installed on the other side of the inlet
housing.
4. Install the relief valve intake seat (6) in the left side
of the lower housing (11), as viewed in F
cast into the lower housing identifies the correct
location for the relief valve seat.) The pin (P) on the
seat must point up into the housing. The pin limits
10
. 8.
IG
®
263 or 2760) to the
. 8. (Text
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the positioning of the seat, ensuring that the vent
hole (V) is not blocked by part of the housing. See
F . 5.
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ball
spring
pressure
relief
valve
F . 5
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5. Install the inlet seat without a relief valve (34) in the
right side of the inlet housing (15).
The seats (6 and 34) are not reversible; the cham-
fered side must face the ball.
6. Place the inlet manifold (18) on the inlet housing
(15). Install the lockwashers (8) and capscrews (9).
Torque to 25-30 ft-lb (34-40 N•m). See F
7. Place the intake manifold (18) in a vise. Place one
o-ring (2*) in each side of the inlet housing (15),
where the tubes (3) sit. Place o-rings (2*) in the
grooves at each end of the tubes. Place a gasket (4)
in both the inlet and outlet housing (15 and 16).
Position the tubes and cylinder (1) in the lower
housing.
It may be necessary to use a rubber mallet to set
the fluid tubes (3) and cylinder (4) in place.
P
7
6
TI8407a
. 8.
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311690M