Cleaning Or Servicing The Meter Chamber; Replacing The Electronic Sensor - Graco G3000 Instructions-Parts List Manual

Cleaning or Servicing the Meter
Chamber
NOTICE
Clean and service the meter at a clean workbench.
Use only lint-free cloth on parts.
Installing and servicing this equipment requires
access to parts that may cause electric shock or other
serious injury if the work is not performed properly. Do
not install or service this equipment unless you are
trained and qualified.
Use only genuine Graco replacement parts. Substitu-
tion of components may impair intrinsic safety. This
could result in a failure which causes serious injury
and/or substantial property damage.
1. Follow the Pressure Relief Procedure, on page 10.
Then close the fluid shut-off valve on each side of
the meter.
2. Disconnect the cable from the electronic sensor
device.
3. Disconnect both fluid line fittings and remove the
meter from the fluid line.
4. Loosen the two screws and remove the electronic
sensor device from the flow meter upper housing.
See the Parts drawings, pages 16-18.
5. Loosen the screws. Keep a few threads of two
opposing bolts engaged to minimize the torque
stress on the shafts when you separate the meter
housings.
6. Hold onto the upper housing and gently tap the
opposing bolts to separate the lower housing.
308778Y
NOTICE
To avoid damaging the shafts, keep the housings par-
allel to each other when separating them; do not rock
the housings from side to side. Do not use chisels or
screwdrivers to split and pry apart the housings.
7. Remove and inspect the gears and shafts. Clean
the meter parts with solvent.
8. Reassemble the gears and shafts into the lower
housing in the position they were removed from.
Check the gears for free and easy rotation.
9. Make sure the two locating pins are in place.
10. Assemble the two meter housings, making sure to
keep them parallel to each other.
11. Install the screws. Tighten them oppositely and
evenly. Tighten to 12 ft-lb (16 N•m) for 289813,
289814, and 26A119. Tighten to 42 in-lb (4.7 N•m)
for 249426 and 249427. Do not over-tighten.
12. After re-assembling the meter, test the gear rotation
by applying a brief air blast to the meter inlet. You
should clearly hear the gears spin.
13. Set the electronic sensor on the upper housing and
tighten the two screws hand-tight, about 27-57 in-lb
(3.1-6.4 N•m). Do not over-tighten.
14. Attach fluid lines and sensor cable.
15. Open fluid shut-off valves.

Replacing the Electronic Sensor

1. Follow the Pressure Relief Procedure, on page 10.
Then close the fluid shut-off valve on each side of
the meter.
2. Disconnect the cable from the electronic sensor
device.
3. Loosen the two screws and remove the electronic
sensor device from the flow meter upper housing.
See the Parts drawings, pages 16-18.
4. Set the electronic sensor on the upper housing and
tighten the two screws hand-tight, about 27-57 in-lb
(3.1-6.4 N•m). Do not over-tighten.
5. Attach sensor cable.
Maintenance
13