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Displacement Pump Service

307427ZAF

17

Displacement Pump Service

CARBON STEEL DISPLACEMENT PUMPS, with leather, 
polyethylene, or PTFE packings

This procedure covers the following displacement 
pumps. Refer to the parts drawings on the indicated 
pages for an illustration of your pump.

Model 215953, page 18.

Model 215956, page 18.

Model 215954, page 19.

Model 215957, page 19.

Model 237254, page 20.

Model 237449, page 21.

Model 237255, page 22.

Before You Start

1.

Disconnect the displacement pump from the air 
motor as explained on page 11.

2.

Be sure you have all the necessary repair parts on 
hand to reduce downtime.

3.

Repair Kits are available. For best results, use all 
the new parts in the kit even if the old parts look 
good. Refer to the parts drawing for your pump.

Intake Valve

1.

Unscrew the intake valve housing (23) from the 
cylinder (13), using a strap wrench. Disassemble 
the valve and clean and inspect all parts.

NOTE: On Models 237254 and 237255, inspect the ball 
(28) and seat in the housing (23) for wear or nicks.

2.

Replace parts as necessary. Reassemble as shown 
in the applicable parts drawing.

Piston Valve

1.

Using a strap wrench, grip the cylinder (13) near the 
outlet housing (6) and unscrew it from the housing. 
Pull the cylinder down off the piston. Check the 
inner surface of the cylinder for scoring or wear by 
running a finger over the surface or holding the part 
up to the light at an angle.

2.

Loosen the lower nut (16) and unscrew the valve 
housing (18) from the connecting rod (17). Unscrew 
the piston stud (22).

3.

Clean and inspect all piston parts. Replace parts as 
necessary. Reassemble the piston parts as shown, 
being sure that the lips of the u-cup packing (21) are 
facing up. 
Screw the piston stud (22) into the valve 
housing (18) and torque to 31 N•m (23 ft-lb).

4.

When reassembling the piston to the connecting rod 
(17), screw the connecting rod all the way into the 
displacement rod (15). Tighten the upper nut (16) 
against the displacement rod and torque to 33 N•m 
(24 ft-lb). Adjust the lower nut (16) to allow 3.1 mm 
(0.125 in.) free travel for the disk (19).

Throat Packings

1.

Remove the cylinder (13) and piston as explained 
previously. Remove the packing nut (1) and pull the 
displacement rod (15) out of the top of the outlet 
housing (6). Inspect the outer surface of the 
displacement rod for scoring or wear by running a 
finger over the surface or holding it up to the light at 
an angle.

2.

Remove the throat packings from the outlet housing 
(6).

3.

Clean and inspect the parts for wear or damage. 
Lubricate the packings before reassembly. Install 
the parts one at a time, in the same position as 
before. The lips of the v-packings must face down 
against fluid pressure.

NOTE: On displacement pumps 215953, 215956, and 
237254, install the two leather v-packings (4) below the 
single PTFE v-packing (3).

4.

Leave the packing nut (1) loose until the 
displacement rod (15) has been installed.

5.

Tighten the packing nut just enough to prevent 
leaking. Overtightening can damage the packings.

6.

Reconnect the displacement pump to the air motor 
as explained on page 11.

 CAUTION

Insert the displacement rod from the top of the outlet 
housing to prevent shearing of the packings.

Summary of Contents for Fast-Flo 226940

Page 1: ...ir Input Pressure 180 psi 1 2 MPa 12 4 bar Maximum Working Pressure For models that are certified see page 4 Important Safety Instructions Read all warnings and instructions in this manual before usin...

Page 2: ...ls tags and labels before operating the equipment Use the equipment only for its intended purpose If you are uncertain about usage call your Graco distributor Do not alter or modify this equipment Use...

Page 3: ...smoke in the spray dispense area Do not turn on or off any light switch in the spray dispense area while operating or if fumes are present Do not operate a gasoline engine in the spray dispense area T...

Page 4: ...N LISTED PUMPS These pumps are for general fluid transfer applications Stubby Pumps Bung Mounted Drum Length Pumps Model No Description Parts Pages 226943 Series B Carbon Steel Leather Packings 14 18...

Page 5: ...end of the wire to a true earth ground Order Part No 237569 Ground Wire and Clamp 2 Non ETL Listed Pumps See FIG 1 Remove the ground screw Z Fasten the ground connector W onto the pump with the ground...

Page 6: ...A to prevent formation of a vacuum in the drum Stubby pumps may be mounted on a wall or on the side of a drum with a clamp Drum pumps can also be mounted to the side of a drum NOTE Refer to Dimensions...

Page 7: ...fluid outlet Model 226951 Only Using moderate force extend the pump suction tube insert the pump into the drum or tank bung hole and screw the bung adapter B tightly into the bung hole Lift the pump...

Page 8: ...to drain the lower part of the pump See FIG 4 Turn the pump over to drain the upper part of the pump Starting and Adjusting the Pump With the air valve K or regulator CC closed turn on the air supply...

Page 9: ...Never allow the pump to run dry of fluid being pumped A dry pump will quickly accelerate to a high speed possibly damaging itself If your pump accelerates quickly or is running too fast stop it immed...

Page 10: ...alves Worn or damaged valves or seals Service the valves or seals The pump operates but the output is low on both strokes Clogged fluid hose or valve Clear the hose or valves Exhausted fluid supply Re...

Page 11: ...n the threads of the displacement rod 15 Make sure the o ring 14 is in place on the rod 2 Insert the muffler T into the air motor connecting rod S as shown in FIG 6 3 Tighten the displacement rod 15 i...

Page 12: ...G air line for Models 237133 and 237134 only 1 169969 FITTING air line for all other models 1 108 206264 NEEDLE VALVE ASSY Includes items 109 112 116 117 1 109 157628 PACKING o ring nitrile rubber 1 1...

Page 13: ...250 SCREW 1 106 177170 TIE ROD 3 107 190165 FITTING air line for Model 237129 only 169969 FITTING air line for all other models 1 108 206264 NEEDLE VALVE ASSY Includes items 109 112 116 117 1 109 1576...

Page 14: ...and 237121 only 169969 FITTING air line for all other models 1 108 206264 NEEDLE VALVE ASSY Includes items 109 112 116 117 1 109 157628 PACKING o ring nitrile rubber 1 110 165722 BODY 1 111 166531 RI...

Page 15: ...SCREW 1 106 177170 TIE ROD 3 107 190165 FITTING air line for Model 237132 only 169969 FITTING air line for all other models 1 108 206264 NEEDLE VALVE ASSY Includes items 109 112 116 117 1 109 157628 P...

Page 16: ...41 NUT lock M8 w nylon insert 3 104 15B249 PIN barrel 1 105 15B250 SCREW 1 106 177171 TIE ROD 3 107 169969 FITTING air line 1 113 114558 COUPLER air line 1 114 218116 DISPLACEMENT PUMP for Model 22695...

Page 17: ...ecting rod 17 Unscrew the piston stud 22 3 Clean and inspect all piston parts Replace parts as necessary Reassemble the piston parts as shown being sure that the lips of the u cup packing 21 are facin...

Page 18: ...e 1 8 104537 O RING PTFE 2 9 214583 BUNG ADAPTER ASSY Includes items 10 and 12 used on Model 215953 only 1 10 172405 BUSHING nylon 1 12 222308 ADAPTER bung carbon steel 1 13 172416 CYLINDER Model 2159...

Page 19: ...4537 O RING PTFE 2 9 214583 BUNG ADAPTER ASSY Includes items 10 and 12 used on Model 215954 only 1 10 172405 BUSHING nylon 1 12 222308 ADAPTER bung carbon steel 1 13 172416 CYLINDER Model 215954 1 177...

Page 20: ...eel 1 6 178542 HOUSING outlet 1 7 101281 FITTING grease 1 8 104537 O RING PTFE 1 13 190063 CYLINDER 1 14 177156 O RING fluoroelastomer 1 15 217189 ROD displacement 1 16 105775 NUT hex M14 x 1 5 2 17 1...

Page 21: ...tlet 1 7 101281 FITTING grease 1 8 104537 O RING PTFE 2 9 214583 BUNG ADAPTER ASSY Includes items 10 and 12 1 10 172405 BUSHING nylon 1 12 222308 ADAPTER bung carbon steel 1 13 172416 CYLINDER 1 14 17...

Page 22: ...HOUSING outlet 1 7 101281 FITTING grease 1 8 104537 O RING PTFE 1 13 190063 CYLINDER 1 14 177156 O RING fluoroelastomer 1 15 217189 ROD displacement 1 16 105775 NUT hex M14 x 1 5 2 17 177160 ROD conn...

Page 23: ...ect all piston parts Replace parts as necessary Reassemble the piston parts as shown being sure that the lips of the u cup packing 21 are facing up Screw the piston stud 22 into the valve housing 18 a...

Page 24: ...537 O RING PTFE 2 9 214583 BUNG ADAPTER ASSY Includes items 10 and 12 used on Model 218113 only 1 10 172405 BUSHING nylon 1 12 222308 ADAPTER bung carbon steel 1 13 172416 CYLINDER Model 218113 1 1771...

Page 25: ...Includes items 10 and 12 1 10 172405 BUSHING nylon 1 12 222308 ADAPTER bung carbon steel 1 13 177165 CYLINDER 1 14 177156 O RING fluoroelastomer 1 15 217189 ROD displacement 1 16 105775 NUT hex M14 x...

Page 26: ...5 Be careful not to drop the ball 25 3 Clean and inspect all piston parts Be sure to inspect the ball 25 and its seat on the piston stud 22 for wear or nicks Replace parts as necessary Reassemble the...

Page 27: ...BUSHING nylon 1 11 104587 BOLT M8 x 1 25 1 12 210877 ADAPTER bung stainless steel 1 13 178863 CYLINDER 55 gal stainless steel 1 14 177156 O RING fluoroelastomer 1 15 217211 ROD displacement 1 16 1057...

Page 28: ...steel 1 6 210876 HOUSING outlet 1 8 104537 O RING PTFE 1 13 172494 CYLINDER stubby 1 14 177156 O RING fluoroelastomer 1 15 217212 ROD displacement 1 20 172393 WASHER stainless steel 1 21 177159 CUP pi...

Page 29: ...LT M8 x 1 25 1 12 210877 ADAPTER bung stainless steel 1 13 178863 CYLINDER 55 gal stainless steel 1 14 177156 O RING fluoroelastomer 1 15 217211 ROD displacement 1 16 105776 NUT hex M14 x 1 5 2 17 177...

Page 30: ...l 1 6 210876 HOUSING outlet 1 8 104537 O RING PTFE 1 13 172494 CYLINDER stubby 1 14 177156 O RING fluoroelastomer 1 15 217212 ROD displacement 1 20 172393 WASHER stainless steel 1 21 172489 CUP piston...

Page 31: ...all piston parts Be sure to inspect the ball 25 and its seat on the piston stud 22 for wear or nicks Replace parts as necessary Reassemble the piston parts as shown being sure that the lips of the u...

Page 32: ...BUSHING nylon 1 11 104587 BOLT M8 x 1 25 1 12 210877 ADAPTER bung stainless steel 1 13 178863 CYLINDER 55 gal stainless steel 1 14 177156 O RING fluoroelastomer 1 15 217211 ROD displacement 1 16 10577...

Page 33: ...steel 1 6 210876 HOUSING outlet 1 8 104537 O RING PTFE 1 13 172494 CYLINDER stubby 1 14 177156 O RING fluoroelastomer 1 15 217212 ROD displacement 1 20 172393 WASHER stainless steel 1 21 177159 CUP pi...

Page 34: ...25 ft long 237569 Ground Wire and Clamp 7 6 m 25 ft long 1 107558 SCREW hex hd cap M8 x 1 25 2 2 104572 LOCKWASHER spring Size 8 2 3 172405 BUSHING 1 4 172428 BRACKET 1 5 172429 CLAMP 1 1 107558 SCREW...

Page 35: ...94 Throat Seal Liquid TSL Solvent for wet cup 0 24 liter 8 oz 204574 Drum Cover 40 liter 10 gallon size and 60 liter 16 gallon size Drum cover mounts on top of an open drum with mounting holes for 1 1...

Page 36: ...npt m Bung Adapter Pump No A Overall Length B Pump Length C Fluid Inlet D Fluid Outlet 226943 226944 226948 237130 237131 615 mm 34 in 181 mm 7 1 in 1 1 2 in npt f 3 4 in npt f 226945 226952 237132 68...

Page 37: ...parts Models 226940 226943 237130 and 237133 Carbon Steel 303 304 and 316 Stainless Steel Leather Cadmium Plated Ductile Iron Chrome and Zinc Plated Steel PTFE fluoroelastomer Models 226941 226944 an...

Page 38: ...in material or workmanship repairs will be made at a reasonable charge which charges may include the costs of parts labor and transportation THIS WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARR...

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