Graco 312068M User Manual
Repair - Parts
312068M
Proportioning Pumps
Proportioning pumps and hydraulic cylinders used on Hydraulic Proportioners. For
professional use only. For professional use only.
Not for use in explosive atmospheres.
Important Safety Instructions
Read all warnings and instructions in this manual
and all supplied manuals. Save all instructions.
Model 247576: 2000 psi (13.8 MPa, 138 bar) Maximum Working Pressure
EN
All other models: 3500 psi (24.0 MPa, 240 bar) Maximum Working Pressure
See page 2 for model information.
TI9778c
Models
Contents
Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Proportioning Pumps . . . . . . . . . . . . . . . . . . . . . 2
Hydraulic Cylinders . . . . . . . . . . . . . . . . . . . . . . . 2
Pumplines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
In-Plant Pumpline . . . . . . . . . . . . . . . . . . . . . . . . 2
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pressure Relief Procedure . . . . . . . . . . . . . . . . . 3
Preventive Maintenance . . . . . . . . . . . . . . . . . . . 3
Pumpline Disassembly . . . . . . . . . . . . . . . . . . . . 4
Pumpline Reassembly . . . . . . . . . . . . . . . . . . . . 4
Pump Base Disassembly . . . . . . . . . . . . . . . . . . 6
Pump Base Reassembly . . . . . . . . . . . . . . . . . . . 6
Piston and Cylinder Seals . . . . . . . . . . . . . . . . . . 7
Hydraulic Cylinder . . . . . . . . . . . . . . . . . . . . . . . 9
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Pumpline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Piston and Cylinder Seals . . . . . . . . . . . . . . . . . 16
Hydraulic Cylinder . . . . . . . . . . . . . . . . . . . . . . . 18
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 22
Graco Information . . . . . . . . . . . . . . . . . . . . . . . . 22
Models
Proportioning Pumps
Part, Series Cylinder Size
24F291, A #28
247371, A #30
247372, A #40
247373, A #48
247374, A #60
247375, A #80
247577, A #88
247376, A #96
247377, A #120
247576, A #140
Hydraulic Cylinders
Part, Series
295027
Pumplines
Part, Series Cylinder Size
288638 #80
288639 #120
In-Plant Pumpline
Part, Series Cylinder Size
P7758-255773 #80
2 312068M
Repair
Repair
Flushing
Flush equipment only in a well-ventilated area. Do not
spray flammable fluids. Do not turn on heaters while
flushing with flammable solvents.
• Flush out old fluid with new fluid, or flush out old
fluid with a compatible solvent before introducing
new fluid.
• Use lowest possible pressure when flushing.
• To flush entire system, circulate through gun fluid
manifold (with manifold removed from gun).
• Always leave some type of fluid in system. Do not
use water.
Pressure Relief Procedure
Trapped air can cause the pump to cycle unexpectedly,
which could result in serious injury from splashing or
moving parts.
1. Select Park on Pump Control Switch if available, or
turn off.
2. Turn off feed pumps.
3. Trigger gun to relieve pressure.
4. Close gun inlet valves.
5. Close fluid supply inlet valves.
6. Service spray gun. See corresponding spray gun
manual.
Preventive Maintenance
When pumps are functioning properly, it is not unusual
for a trace amount of resin to seep past the pump packing onto the resin pump shaft. Routinely inspect shaft
and wipe away any residue when the proportioner is
turned off. Disassemble and clean the proportioning
pumps annually. For pumpline P7758-255773, disassemble and clean the proportioning pumps every six
months. Inspect the pistons and cylinder for marks or
scratches, which may cause leakage and damage to
packings. Replace all packings, o-rings, and bushings
annually. For pumpline P7758-255773, replace these
items every six months.
312068M 3
Repair
Pumpline Disassembly
1. Remove plug fitting (206) from lube cylinder (205).
2. Insert clevis pin removal tool 296607 through opening in lube cylinder (205) and screw tool into left
clevis pin (219). Pull clevis pin out of clevis (117).
3. Use hex key to remove four socket head cap
screws (203) from left proportioning pump (202).
Remove left proportioning pump.
4. Remove lube cylinder (205).
5. Screw pin removal tool 296607 into right clevis
pin (219). Pull clevis pin out of clevis (117).
6. Use hex key to remove four socket head cap
screws (203) on right proportioning pump (202).
Remove right proportioning pump.
203
Pumpline Reassembly
1. Slide the hydraulic piston (104) in the hydraulic
cylinder (201) out to its left-most position. The left
end of the left clevis (117) should be nearly in line
with the left end of the spacers (113). See the following image.
2. Place hydraulic cylinder (201) on flat surface with
both the manifold (125) and the port blocks (116)
contacting the surface. The two main ports in the
manifold should be facing up. See the following
image.
125
113
116
116
117
104
ti13871a
203
201
219
202
219
204
202
207
208
205
206
204
ti13870a
3. Install elbow fittings (207, 208) into lube
cylinder (206) and install lube cylinder over left
clevis (117). Ensure clevis pin hole in lube cylinder
is vertical, in line with the hole in the left clevis.
4. Place left proportioning pump (202) on flat surface
with the wide end of the outlet flange (26) facing
down.
5. Use clevis pin removal tool 296607 to slide the proportioning pump piston rod (28) out to its limit.
Ensure the hole in the proportioning pump shaft is
vertical, in line with the hole in the left clevis and
lube cylinder.
206
35
26
28
ti13875a
4 312068M
Repair
6. Attach the clevis pin (219) to the clevis pin tool.
Insert clevis pin through hole in lube cylinder and
into the left clevis.
7. Gently tap end of clevis pin tool with hammer to
slide clevis pin (219) into place. Remove clevis pin
tool from clevis pin.
8. Insert four hex head cap screws (203) through holes
in proportioning pump (202) and partially screw into
spacers (113) in hydraulic cylinder (201).
9. With the four hex head cap screws in place but not
tightened, slide the proportioning pump against the
hydraulic cylinder.
10. Clamp the hydraulic cylinder and proportioning
pump assembly to the flat surface so the proportioning pump and hydraulic cylinder will not twist when
tightened against each other.
11. Tighten the hex head cap screws in a criss-cross
pattern.
12. Repeat steps 4-11 with the right proportioning
pump.
13. Install plug fitting (206) into lube cylinder (205).
14. Use grease pump to apply grease to grease
fittings (35) in proportioning pumps.
312068M 5
Repair
Pump Base Disassembly
Disassemble and clean pump base annually. For
pumpline P7758-255773, disassemble and clean the
pump base on every six months.
1. Relieve pressure, page 3.
2. Turn OFF the main disconnect and lock out power at
the source.
3. Remove pump cap (19) from pump base (23), and
remove o-ring (6):
a. Remove outlet ball (4) and o-ring (9).
b. Remove inlet ball cage (14), spring (22) and
inlet ball (10).
c. Remove inlet ball seat (11) and o-ring (9) from
bottom of cavity.
d. Thoroughly clean all metal parts in a compatible
solvent and inspect for wear or damage. Inspect
each ball and seat for nicks or scratches;
replace as required.
e. Replace all o-rings. Kit 261859 contains all
o-rings for pump base rebuild.
Pump Base Reassembly
1. Install inlet valve in pump base by inserting o-ring
(9), inlet ball seat (11), ball (10), spring (22), and
inlet ball cage (14) into pump base cavity. See Parts
on page 15.
2. Install outlet valve in pump base:
a. Install o-ring (9) and valve ball (4) into the cavity.
b. Install the o-ring (6) on pump cap (19). Install
and tighten cap to pump base. Torque to 75 ft-lb
(101.3 N•m).
TI9780b
19
6
4
9
14
22
10
11
9
23
6 312068M
Repair
Piston and Cylinder Seals
Piston Seal and Cylinder Seal Repair Kits are available. See Table 1 on page 17 to order the correct
kits for your pump. Also see kit manual 312071.
Disassembly
1. Relieve pressure, page 3.
2. Turn OFF the main disconnect and lock out power at
the source.
3. Disconnect the pump inlet and outlet lines; see your
proportioner repair manual. Remove the four screws
(30) holding the pump outlet flange (26) to the
hydraulic cylinder. Disconnect pump from drive and
take pump assembly to a workbench.
4. Remove the four bolts (8) and washers (5). See
Parts on page 15.
5. Remove the flange retainer (27), gasket (17), bushing (13), and throat seal (29).
6. Use a soft-faced mallet to help separate pump base
(23) and outlet flange (26) from cylinder (12).
Remove crossover tube (24)
7. Remove piston from cylinder bore. Remove piston
cap bolt (25), then slide bushing (18) and u-cup seal
(15) from rod.
Reassembly
CAUTION
To prevent cross-contamination of the equipment’s
wetted parts, never interchange component A (isocyanate) and component B (resin) parts.
1. Install piston rod seal (15); ensure u-cup faces piston rod (28) as shown in F
15
18
F
IG. 1: U-Cup Orientation
28
2. Assemble piston bolt (25) to piston rod (28). Apply
supplied thread sealant to piston bolt and tighten.
See Torque Specification table for torque according
to pump size.
15
3
25
1
#28 Pump Size
IG. 1.
TI9823a
28
1
Apply supplied sealant to threads.
28
TI9822a
8. Thoroughly clean all parts in a compatible solvent
and inspect for wear or damage. Replace as
25
18
15
1
required.
r_24f290_312068
IG. 2: Piston Head and Rod
F
Torque Specification
Pump Size Torque
30 130 in-lb (14.7 N•m)
28, 40, 48, 60 22 ft-lb (29.7 N•m)
80, 88, 96, 120, 140 45 ft-lb (60.8 N•m)
312068M 7
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