Maintenance
312752D
9
Maintenance
When using MixHead, be careful to avoid damaging pre-
cision tip. Return MixHead to Graco once a year for
maintenance.
Nozzle Assembly
Tools Required
•
1 in. wrench
•
3/8 in. wrench
•
5/32 hex key
•
Brass wire brush
•
O-ring pick
•
Needle extracting tool
Disassembly
1.
Use a 1 in. open-end wrench to unscrew the injec-
tion nozzle retainer (102) from the MixHead body.
2.
Rotate injection nozzle and needle valve kit (101)
counter clockwise to remove from injection nozzle
retainer (102).
3.
Using a 3/8 in. wrench and a 5/32 hex key, remove
hex locknut (103) and injection adjustment
screw (104) from injection nozzle retainer (102).
4.
Remove needle (206) from needle housing (205).
a. Thread 1/4-20 bolt into rear of needle (206).
b.
Holding on to 1/4-20 bolt, pull needle (206) out
rear of needle housing (205). See F
. 4 on
page 12.
5.
Use an o-ring pick to remove o-rings.
6.
Use a brass, wire brush to clean metal parts as nec-
essary.
7.
Inspect the o-rings and replace with new ones as
required.
Shut off all power. Bleed the chemical, hydraulic, and
tank pressures to zero pressure.
CAUTION
Relieving pressure will expose chemicals to moist air.
See
Moisture Sensitivity of Isocyanates
on page 5
for the effects of exposing chemicals to moist air.
See F
CAUTION
DO NOT soak the o-ring in cleaning solvents as they
will swell and be unusable.
101
102
103
104
Key:
101 Injection Nozzle and Needle Valve Kit
102 Injection Nozzle Retainer
103 Hex Locknut
104 Injection Adjustment Screw
Summary of Contents for 30110-500-2
Page 14: ...Parts 14 312752D...
