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Troubleshooting

308360D

11

Troubleshooting

1. Follow 

Pressure Relief Procedure

, page 8, before 

checking or repairing the pump.

2. Check all possible problems and causes before 

disassembling pump.

To determine if the fluid hose or gun is obstructed:

1. Perform the 

Pressure Relief Procedure

, page 8. 

2. Disconnect the fluid hose and place a container at 

the pump fluid outlet to catch any fluid.

3. Turn on the air just enough to start the pump. If the 

pump starts when the air is turned on, the 
obstruction is in the fluid hose or gun.

NOTE: 

If you experience air motor icing, call Graco 

Technical Assistance.

Problem

Cause

Solution

The pump fails to operate.

The air line is restricted or the air 
line is inadequate; valves are closed 
or clogged.

Clear the line; increase the air 
supply. Check that the valves are 
open.

The fluid hose or gun is obstructed; 
the fluid hose ID is too small.

Open, clear*; use a hose with a 
larger ID.

Fluid has dried on the displacement 
rod.

Clean the rod; always stop the pump 
at the bottom of its stroke; keep the 
wet-cup 1/3 filled with a compatible 
solvent.

Motor parts are dirty, worn, or 
damaged.

Clean or repair; see the separate 
motor manual.

The pump operates, but the output 
is low on both strokes.

The air line is restricted or the air 
line is inadequate; valves are closed 
or clogged.

Clear the line; increase the air 
supply. Check that the valves are 
open.

The fluid hose or gun is obstructed; 
the fluid hose ID is too small.

Open, clear*; use a hose with a 
larger ID.

The packings in the displacement 
pump are worn.

Replace the packings.

The pump operates, but the output 
is low on the downstroke.

The intake valve is held open or 
worn.

Clear the valve; service.

The pump operates, but the output 
is low on the upstroke.

The piston valve or packings are 
held open or worn.

Clear the valve; replace the 
packings.

Erratic or accelerated pump speed.

The fluid supply is exhausted.

Refill the supply and prime the 
pump.

The piston valve or packings are 
held open or worn.

Clear the valve; replace the 
packings.

The intake valve is held open or 
worn.

Clear the valve; service.

Summary of Contents for Dura-Flo 1200

Page 1: ...i 0 7 MPa 7 bar Maximum Air Input Working Pressure 237517 Pump Series A 13 1 Ratio with Senator Air Motor 1300 psi 9 MPa 90 bar Maximum Fluid Working Pressure 100 psi 0 7 MPa 7 bar Maximum Air Inlet W...

Page 2: ...ired Tools 12 Disconnect the Displacement Pump 12 Connect the Displacement Pump 12 Disassemble the Displacement Pump 14 Assemble the Displacement Pump 16 Parts 19 Packing Kits 21 Performance Charts 22...

Page 3: ...when equipment is not in use Check equipment daily Repair or replace worn or damaged parts immediately with genuine manufacturer s replacement parts only Do not alter or modify equipment Alterations...

Page 4: ...ug power cords or turn power or light switches on or off when flammable fumes are present Use only grounded hoses Hold gun firmly to side of grounded pail when triggering into pail Do not use pail lin...

Page 5: ...hen flushing or relieving pressure hold metal part of the spray gun dispense valve firmly to the side of a grounded metal pail then trigger the gun valve Accessories Install the following accessories...

Page 6: ...r line drop to drain off moisture Second bleed type air valve K isolates the air line accessories for servicing NOTE Locate upstream from all other air line accessories Fluid Line Fluid filter L with...

Page 7: ...equired for pump F Pump air regulator G Air manifold H Electrically conductive air supply hose J Air line filter K Bleed type master air valve for accessories L Fluid filter M Fluid drain valve requir...

Page 8: ...e Equipment Flush before fluid can dry in the equipment at the end of the day before storing and before repairing equipment Flush at the lowest pressure possible Check connectors for leaks and tighten...

Page 9: ...as a priming valve until the fluid flows from the valve Close the valve NOTE When changing fluid containers with the hose and gun already primed open the drain valve M to help prime the pump and vent...

Page 10: ...f Procedure page 8 2 Follow Flush the Equipment page 8 NOTICE Always use the lowest air pressure necessary to get the desired results Higher pressures cause premature tip and pump wear NOTICE Always f...

Page 11: ...he displacement rod Clean the rod always stop the pump at the bottom of its stroke keep the wet cup 1 3 filled with a compatible solvent Motor parts are dirty worn or damaged Clean or repair see the s...

Page 12: ...reconnects it to the motor 3 Screw the nuts 108 onto the tie rods 105 Torque the nuts to 81 89 N m 60 66 ft lb 4 Screw the coupling nut onto the motor shaft MS loosely Hold the motor shaft flats with...

Page 13: ...intenance 308360D 13 FIG 2 Model 237516 Shown Torque to 136 149 N m 100 110 ft lb 1 2 Torque to 196 210 N m 145 155 ft lb Torque to 81 89 N m 60 66 ft lb 3 V 108 U 109 2 1 106 107 MS 110 105 101 1 2 3...

Page 14: ...ing 18 from the outlet housing 7 b Gently pull the cylinder and valve housing straight out of the outlet housing the displacement rod 1 and piston assembly will come out with these parts c Place the v...

Page 15: ...IG 3 FIG 4 03794A BS 19 17 8 Joint A 2 1 7 9 18 Joint B Torque to 325 353 N m 240 260 ft lb 1 2 Lubricate Torque to 190 217 N m 140 160 ft lb 3 1 1 2 2 3 03793A 1 10 16 1 10 11 16 Torque to 386 407 N...

Page 16: ...erial see Packing Kits page 21 6 Apply anti seize 20 and install the packing nut 2 loosely into the outlet housing 7 7 Lubricate the piston packings Slide the displacement rod 1 and piston assembly do...

Page 17: ...N m 240 260 ft lb This will torque both cylinder joints A and B See FIG 3 page 15 17 Using a pipe wrench torque the intake valve 19 to 190 217 N m 140 150 ft lb See FIG 3 page 15 18 Torque the packin...

Page 18: ...Packing Detail at left Torque to 190 217 N m 140 160 ft lb 1 2 7 OV 10 9 18 16 SS 17 BS 8 11 PG PS PV 8 14 5 2 Ref 4 3 6 7 Ref 10 Ref 9 Ref 16 Ref 13 12 15 18 Ref 8 Ref 6 4 6 4 5 4 5 4 4 4 3 2 3 9 7 1...

Page 19: ...1 Replacement safety labels tags and cards are available at no cost These parts are included in Connection Kit 235417 For applications requiring stainless steel tie rods order Connection Kit 235418 1...

Page 20: ...ball piston stainless steel 1 11 102972 BALL piston stainless steel 0 875 in 22 2 mm diameter 1 16 222951 HOUSING seat piston valve stainless steel with tungsten carbide seat 1 17 108001 BALL intake...

Page 21: ...t male stainless steel 1 13 184230 GLAND piston male stainless steel 1 14 109310 V PACKING piston PTFE 5 15 184180 GLAND piston female stainless steel 1 20 123174 ANTI SEIZE not shown 1 0805 0806 14 1...

Page 22: ...ow right to scale to read air consumption NOTE Recommended pump speed for continuous operation to shaded area is 60 cpm Model 237516 Bulldog Pump Model 237517 Senator Pump Key Black Curve Fluid Outlet...

Page 23: ...64 in 94 28 mm 3 712 in 11 1 mm 0 437 in DIA 4 94 28 mm 3 712 in 0653 Three M16 x 2 0 Holes Pump Model A B C D E F G 237516 1134 mm 44 65 in 590 mm 23 23 in 544 mm 21 42 in 257 mm 10 12 in 2 in np f 1...

Page 24: ...0 mm Displacement pump effective area 1 86 in 2 12 cm2 Maximum pump operating temperature 180 F 82 C Air inlet size 3 4 npsm f Fluid inlet size 2 in npt f Fluid outlet size 1 in npt f Weight 240 lb 10...

Page 25: ...in 2 12 cm2 Maximum pump operating temperature 180 F 82 C Air inlet size 3 4 npsm f Fluid inlet size 2 in npt f Fluid outlet size 1 in npt f Weight 240 lb 109 kg Wetted parts 316 440 and 17 4 PH Grad...

Page 26: ...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 WARRAN...

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