Loading...Graco Inc. 247371, 247372, 247373, 247374, 247375 Repair - Parts
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Repair - Parts
Proportioning Pumps
312068K
ENG
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
All other models: 3500 psi (24.0 MPa, 240 bar) Maximum Working Pressure
See page 2 for model information.
TI9778c
Models |
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Contents |
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Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 2 |
Proportioning Pumps . . . . . . . . . . . . . . . . . . . . . |
2 |
Hydraulic Cylinders . . . . . . . . . . . . . . . . . . . . . . . |
2 |
Pumplines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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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 . . . . . . . . . . . . . . . . . . . . . . . |
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Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
15 |
Pumpline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Piston and Cylinder Seals . . . . . . . . . . . . . . . . . |
16 |
Hydraulic Cylinder . . . . . . . . . . . . . . . . . . . . . . . |
18 |
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Graco Standard Warranty . . . . . . . . . . . . . . . . . . . |
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Graco Information . . . . . . . . . . . . . . . . . . . . . . . . |
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Models
Proportioning Pumps
Part, Series |
Cylinder Size |
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247371, A |
#30 |
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247372, A |
#40 |
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247373, A |
#48 |
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247374, A |
#60 |
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247375, A |
#80 |
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247577, A |
#88 |
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247376, A |
#96 |
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247377, A |
#120 |
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247576, A |
#140 |
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Hydraulic Cylinders
Part, Series |
Cylinder Size |
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247624 |
#80 |
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255723 |
#80 |
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295027 |
#80 |
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Pumplines
Part, Series |
Cylinder Size |
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288638 |
#80 |
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288639 |
#80 |
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P7758-255773 |
#80 |
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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.
Repair
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.
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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
202
219
201
219
207
204
205
206
204
202 
208
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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
104
117
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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
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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.
Repair
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.
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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.
19 
6 
4
9
14 
22 
10 
11
9 
23
TI9780b
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).
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Piston and Cylinder Seals
Piston Seal and Cylinder Seal Repair Kits are avail- 
able. 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.
8.Thoroughly clean all parts in a compatible solvent and inspect for wear or damage. Replace as required.
Repair
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 FIG. 1.
28
15
18
TI9823a
FIG. 1: U-Cup Orientation
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 28
3
TI9822a
25 1
1 Apply thread sealant to threads.
FIG. 2: Piston Head and Rod
Torque Specification
Pump Size |
Torque |
30 |
130 in-lb (14.7 N•m) |
40, 48, 60 |
22 ft-lb (29.7 N•m) |
80, 88, 96, 120, 140 |
45 ft-lb (60.8 N•m) |
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