User's Manual

Maintenance
20 312753E
Pour Nozzle Removal and
Installation
Tools Required
• Torque wrench with M6 and M8 sockets
• Fine-grade wire brushes on air tool
1. Cycle the cleanout plunger to the open/pour posi-
tion.
2. Remove the socket head cap screws holding the
pour nozzle to the MixHead body, and remove the
nozzle. If there is resistance, lightly tap the nozzle
with a soft hammer until it breaks free from the Mix-
Head body.
3. Thoroughly clean the external surface and the bore
of the pour nozzle of all foam and foreign matter
using fine grade wire brushes. Soak the nozzle in
solvent if necessary.
4. Thoroughly clean the external mounting surface of
the MixHead body using fine grade wire brushes.
Cycle the cleanout plunger forward to the
closed/non-pour position.
5. Carefully install the pour nozzle onto the cleanout
plunger and into position on the MixHead body.
Install and finger-tighten the screws. Cycle the clea-
nout plunger several times to ensure proper align-
ment of the pour nozzle. Leave the cleanout plunger
in the closed/non-pour position after cycling.
6. Using a torque wrench, alternately tighten the three
socket head cap screws a half-turn at a time to
180 in-lb.
Step Seal and Scraper Seal
Replacement
Replacement of the step seal and the scraper seal
should be considered only when a hydraulic leak devel-
ops out of the pour nozzle, or when an excessive
amount of foam is getting into the hydraulics of the clea-
nout plunger.
MixHeads requiring step seal and/or scraper seal
replacement must be returned to Graco for rebuilding.
NOTICE
Proper alignment of the cleanout plunger within the
bore of the pour nozzle is critical to the life of the Mix-
Head.
NOTICE
Do not attempt to replace the step seal and/or scraper
seal yourself.