Replacing The Piston Seals - Haskel Q-Drive QGD Series Installation, Operation And Maintenance Manual

Q-Drive Installation, Operation, and Maintenance Manual
6. Assemble the clamps with 3/off M6x12 SHCS Black. Use Loctite 7471 and 243. Torque each M6 to
16Nm. Paint mark SHCS after tightening.

Replacing the Tie Rods

Replacing Check Valves

Replacing Cooling Jackets

Replacing the Piston Seals

The piston seal package includes seals and PTFE-based bearings.
1. Perform the procedure in "Disassembling the Gas Section."
2. Insert the 10-32 screw into the piston center threaded hole and hand tighten. Use the screw
to pull the piston out.
3. Inspect the Inspect the barrel for scratches and changes in the polish. Burnishing
discoloration is normal. For scratches deeper than fingernail depth, plan to replace the barrel.
Consult a Haskel representative for instructions.
4. Remove the snap ring from the piston body.
5. Remove the front bearing, piston seal, and backup. Make a note of the orientation of the
piston seal.
6. Open the new seal kit.
7. Install the backup, the piston seal, and the front bearing. Position the piston seal in its original
orientation.
8. Replace the snap ring.
9. Position the piston so that its flat surface is facing the end cap.
10. Push the piston into the barrel to a depth of about 0.75 in (20 mm) or until it touches the rod.
Use a rubber mallet if necessary.
11. Continue to reassemble the gas section from Step 4 of "Reassembling the Gas Section."
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