Air Piston and Lower Spring Service

Service

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.

WARNING

To reduce the risk of injury from trapped air pres- sure 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.

CAUTION

Ketone fumes may damage the piston o-rings. When pumping ketones (such as acetone, MEK, etc.), use Conversion Kit 221038. This kit replaces the stan- dard 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). Re- place 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.

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 NSm (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 tight- ening. When installed, there should be 0.8 mm (0.032 in.) minimum clearance between the wash- er (4) and the piston shaft shoulder. See Fig. 2.

Packing 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: Fluoroelastomer packing 111383 is 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 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 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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215963 specifications

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