Service - Graco F Series Instructions-Parts List Manual

WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
follow the Pressure Relief Procedure
on page 6 before checking or servicing
any part of the system and whenever you are
instructed to relieve the pressure.
Displacement Pump Service (See Fig. 3)
1. Relieve the pressure as instructed on page 6.
2. Flush the pump as instructed on page 8.
3. Relieve the pressure.
4. Remove the tie rod locknuts (19) from beneath the
tie plate (18). See Fig. 3.
5. Remove the locknuts (14) from above the yoke
(16). Pull the displacement pumps (20) and the tie
plate (18) straight down and off the yoke.
6. Remove the washers (15) and unscrew the retain-
ing rings (17) to remove the displacement pumps
from the tie plate (18).
7. Refer to instruction manual 307944 to service the
displacement pumps.
8. Reassemble the pump as instructed on page 11.
Changing the Fluid Mix Ratio
To change the fluid mix ration of the proportioning
pump, three displacement pumps must be used. The
standard tie plate (18) and yoke (16) will accept a third
displacement pump. Order one each of part no.
164417 Retaining Ring (17), and 164416 Washer (15)
to connect the third pump.
Always use the two outer displacement pumps to
supply the Resin and the middle displacement pump to
supply the Isocyanate parts of the polyurethane chemi-
cal. See the Mix Ratio – Pump Combination Chart
for the pump combinations.
CAUTION
To avoid stress on the yoke, which can break the
pump displacement rod:
1. Do not use combinations of only two pumps to
change ratios.
2. The outer two pumps must be identical.
10 306989

Service

Mix Ratio – Pump Combination Chart
For ratios other than 1:1, use three displacement
pumps in the following combinations.
Mix
Ratio Ratio
1.25:1
1.33:1
1.50:1
1.66:1
2:1
2.40:1
2.50:1
2.66:1
3:1
3.2:1
4:1
* Pump 2 is the center pump.
NOTE: Displacement pump part no. 239388 can be
used wherever 222012 is listed and obtain the same
ratio.
Installing Three Displacement Pumps
If you are changing to a different type of fluid, thor-
oughly flush and clean all of the equipment and the
hoses. Make sure that none of the previously used
fluid remains in any part of the system.
1. Relieve the pressure as instructed on page 6.
2. Flush the pump as instructed on page 8.
3. Relieve the pressure.
4. Remove the displacement pumps as instructed in
steps 4 to 6 in Displacement Pump Service.
5. Install the center displacement pump first, then the
two outer pumps. Refer to Pump Reassembly on
page 11.
Displacement Pump Part No.
Pump 1 Pump 2*
222019 222015
222017 222012
222019 222017
222017 222015
222012 222012
222015 222017
222012 222015
222017 222019
222012 222017
222015 222019
222012 222019
CAUTION
Pump 3
222019
222017
222019
222017
222012
222015
222012
222017
222012
222015
222012