Service; Air Piston And Lower Spring Service; Packing Replacement; Upper Spring Replacement - Graco Fast-Flo A Series Instructions Manual

Service

Service
Service Service
NOTE NOTE NOTE: Repair Kit 214584 is available. For best
results, use all the new parts in the kit, even if the
old parts look good. Parts included in the kit are
marked with a dagger, for example (6†), in the text
and illustrations.
Air Piston Piston and and Lower Lower Spring
Air Air Piston and Lower
To reduce the risk of injury from trapped air
pressure when servicing the air motor, always
remove air cap (7) from air cylinder (8) before
removing air cylinder from base (22).
1. Unscrew the cylinder cap (7) from the cylinder
(8). To remove the spring (5), pry gently under
the coils in the direction of the helix.
2. Unscrew the cylinder (8) from the base (22) and
lift the cylinder off the air piston (11). Using a
pliers (B) on the air exhaust plate (16) and a
wrench (C) on the piston shaft (23), unscrew the
piston from the shaft. See Fig. 2.
Ketone fumes may damage the piston o-rings.
When pumping ketones (such as acetone,
MEK, etc.), use Conversion Kit 221038. This
kit replaces the standard fluoroelastomer
o-rings with EPDM o-rings which are resistant
to ketones.
3. Disassemble the piston and wash all parts in
compatible solvent. Refer to the parts list on
page 9. Blow parts dry and inspect for wear
or damage. If any of the valve plate spacers
(13) are damaged, replace all three to maintain
proper clearance between the valve plates and
the seats.
4. Remove and inspect the lower spring (20).
Replace if necessary, and reinstall.
5. A decrease in performance accompanied by
a slower than normal cycle rate is commonly
caused by icing. It is recommended that the
pump is shut down, and the ice is allowed to
thaw.
8
Spring Service Service
Spring Service
NOTICE
NOTICE NOTICE
6. Reassemble the air piston (11), using new parts
as needed. Apply a good grade of thread sealant
to the threads of the screws (12). and torque
evenly to 1.1–1.6 N•m (10–14 in-lb). With the
washer (4) in place, apply thread sealant to the
threads of the piston. Carefully screw the piston
(11) onto the shaft (23) by hand so it is securely
fastened. Do not use pliers on the air exhaust
plate while tightening. When installed, there
should be 0.8 mm (0.032 in.) minimum clearance
between the washer (4) and the piston shaft
shoulder. See Fig. 2.

Packing Replacement

Packing Packing Replacement Replacement
1. Unscrew the cylinder cap (7) from the cylinder
(8). To remove the spring (5), pry gently under
the coils in the direction of the helix.
2. Unscrew the cylinder (8) from the base (22) and
lift the cylinder off the air piston (11). Disconnect
the piston shaft (23) from the pump connecting
rod and pull the shaft up out of the air motor
base. Remove and inspect the packing (9†),
being careful not to mar the inner lip. See Fig. 2.
NOTE NOTE: Fluoroelastomer packing 111383 is NOTE
available as an accessory, for use with solvents
not compatible with the standard nitrile rubber
packing.
3. Replace the packing and reassemble the air
motor in the reverse order of disassembly.
Upper Spring Spring Replacement Replacement
Upper Upper Spring Replacement
Unscrew the cylinder cap (7) from the cylinder (8).
To remove the spring (5), pry gently under the coils
in the direction of the helix.
Cleaning the Cleaning Cleaning the Muffler the Muffler Muffler
To clean the muffler (26), remove it from the unit and
soak it in mineral spirits, then blow dry with air to
remove excess solvent.
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