MANL-00005-A - D Series Rotary Dispensers.docx 20
SERVICE INSTRUCTIONS
For technical support, contact HERO Customer Service at 800-494-4376 or customercare@hero.ca.
CAUTION: Remove power to the dispenser prior to performing any service operations.
Piston Seal Replacement
1. Remove gauge from canister.
2. Loosen the two set screws from the end cap assembly and allow sleeve (if equipped) to drop down
around the pump cylinder.
3. Remove the entire end cap / plunger assembly from the cylinder, lifting vertically.
4. Clean colorant from piston assembly.
5. Place plunger shaft in a vice using soft jaws. Do not over tighten the vise.
6. Unthread and remove plunger handle from shaft.
7. Slide end cap assembly off plunger shaft.
8. Remove the screw securing the piston seal to the shaft.
9. Set aside the washer, seal support and screw for later reuse.
10. Discard used seals.
NOTE: Screw is secured with thread locking compound and may be difficult to remove. Ensure the correct
size and type of screwdriver is used to facilitate removal. If unable to remove screw, cut away old seal with
a knife and apply a small amount of heat to the screw to soften the locking compound and allow easier
removal.
11. Remove the new seal from installation tool.
NOTE: The piston seal will begin to expand as soon as removed from the cylinder or tool. If the seal
remains out of the cylinder or tool for longer than 5 minutes, the seal should be inserted into the tool to
compress it prior to installation into the cylinder.
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