Graco LRT PD44, Setup And Operation

Page: 40 / 48

Maintenance
40 313877G
Maintenance
NOTE: If material is leaking, see Troubleshooting on
page 40.
See Related Manuals on page 3 for dispense valve and
feed system maintenance schedule and procedures.
Air-Water Separator/Filter
Drain water once a shift or as necessary.
Troubleshooting
All Machines
Motor Driven PD44 Only
Perform Pressure Relief Procedure before perform-
ing any troubleshooting procedure.
Problem Cause Solution
Dispense valve stalling and no mate-
rial being dispensed despite ade-
quate input pressure Blocked mixer Check mixer for cured material,
replace mixer as required
Flow control valve closed Open
Dispense valve not discharging nor-
mal or full volume Low material level in reservoirs Fill material reservoirs and prime the
machine
Air in material tanks Fill reservoirs and prime machine
Material leaks past spool valves Spool valve worn or damaged Replace the spool valve and sleeve
Improper material mixing Mixer not clean or free Remove and replace the mixer
Material leaks around mixer while
dispensing Cured material in mixer Check mixer for cured material,
replace mixer
Problem Cause Solution
The horn beeps after each shot Dispense is longer than the dispense
limit timer Check mixer for cured material
The horn beeps continuously If the low level sensors are on, the
system may be low on material Check level screen for low level con-
dition, if low level condition is pres-
ent, fill tank with material