Repair/Parts ™ Merkur Bellows Displacement Pump 312793H EN For pumping isocyanates, UV coatings, and other moisture-sensitive materials. For professional use only. See page 6 for model information, including maximum working pressures. Important Safety Instructions Read all warnings and instructions in this manual. For complete warnings and instructions see your pump or package manual. Hazard symbols refer to specific procedure risks. Save these instructions.
Related Manuals Contents Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Important Two-Component Material Information . Isocyanate Conditions . . . . . . . . . . . . . . . . . . . . . Material Self-ignition . . . . . . . . . . . . . . . . . . . . . . Keep Components A and B Separate . . . . . . . . . Moisture Sensitivity of Isocyanates . . . . . . . . . . . Changing Materials . . . . . . . . . . . . . . . . . .
Warnings Warnings The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The exclamation point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific risks. When these symbols appear in the body of this manual, refer back to these Warnings. Product-specific hazard symbols and warnings not covered in this section may appear throughout the body of this manual where applicable.
Warnings WARNING WARNING EQUIPMENT MISUSE HAZARD Misuse can cause death or serious injury. • Do not operate the unit when fatigued or under the influence of drugs or alcohol. • Do not exceed the maximum working pressure or temperature rating of the lowest rated system component. See Technical Data in all equipment manuals. • Use fluids and solvents that are compatible with equipment wetted parts. See Technical Data in all equipment manuals. Read fluid and solvent manufacturer’s warnings.
Important Two-Component Material Information Important Two-Component Material Information Isocyanate Conditions Spraying or dispensing materials containing isocyanates creates potentially harmful mists, vapors, and atomized particulates. Read material manufacturer’s warnings and material MSDS to know specific hazards and precautions related to isocyanates. Prevent inhalation of isocyanate mists, vapors, and atomized particulates by providing sufficient ventilation in the work area.
Models Models Check your displacement pump’s identification marking (ID) for the 6-digit part number. Use the following matrix to define the construction of your displacement pump, based on the six digits. For example, displacement pump Part No. LB100A represents a 303 stainless steel bellows style displacement pump, 100 cc, with 3 UHMWPE and 2 PTFE v-packings. ID To order replacement parts, see Parts section starting on page 16.
Component Identification Component Identification A B C D E F G H J ti14532a FIG. 1.
Repair Repair General Information NOTE: Reference numbers and letters in parentheses in the text refer to the callouts in the figures. Always use Genuine Graco Parts and Accessories, available from your Graco distributor. If you supply your own accessories, be sure they are adequately sized and pressure rated for your system. Preparation 6. Use a 5 mm hex wrench to loosen the screws (10) on the top cap. 7. Hold the coupling nut with a wrench. Use another wrench to turn the motor shaft.
Repair Replace the Bellows 5. Use a socket to remove the foot cap (42). Remove and discard the o-ring (41). Disassemble Bellows and Chamber 6. Hold the hex on the connecting rod (14) with a 19 mm (3/4 in.) wrench. Brace against tie rod or bench so it cannot turn. Use a socket to loosen the piston/rod assembly. NOTICE To avoid damage to the top cap and D-shaped seal, never apply torque to the connecting rod. 1. Follow all steps under Preparation, page 8. 2.
Repair Reassemble Bellows and Chamber seal (106) on the connecting rod (14). Hold connecting rod with 19 mm (3/4 in.) wrench. Install and tighten the retaining nut (105). Torque to 100-120 in-lb (11-14 N•m). Do not overtighten. 1. Slide the bellows bushing (6) and new bellows (7) on the connecting rod (14). 2. Install new o-rings (4 and 5) into snap bushing. Grease and install snap bushing (3) on end of bellows and snap into place. 8. Install a new foot cap o-ring (41).
Repair Complete Pump Repair Disassembly 1. Follow all steps under Preparation, page 8. 2. Use a socket to remove the foot cap (42). Remove and discard the o-ring (41). 3. Use a 5 mm hex wrench to loosen the three screws (10) on the top cap. Lift the air motor shaft to remove the top cap (8) and the shield mount spacer (9) from the bellows chamber. 4. Hold the hex on the connecting rod (14) with a 19 mm (3/4 in.) wrench so it cannot turn. Use a socket to loosen the piston/rod assembly. See FIG. 5. 12.
Repair 17. Put the hex of the piston (45) in a vise, then use a 23 mm socket to remove the piston rod (31). 2. Install check ball (34) and seat (33) in the top of the piston. Grease and install new o-ring (32). 18. Remove the piston o-ring (32) and seat (33). Remove from vise and tip out the check ball (34) and spring (36). 3. With hex of piston (45) still in vise, apply thread lubricant and then use a socket to reattach the displacement rod (31). Torque to 91-109 ft-lb (123-148 N•m). 1 Apply grease.
Repair 1 Apply grease. 2 U-cup faces up (toward cylinder when installed). 1 2 1 11. V-Packing Models: Install new piston spring (35). Lubricate and install male gland (40), new piston packings (37, 39), and female gland (38) on the displacement rod (31). Lips must face toward the cylinder. 51 1 50 12. U-Cup Models: Lubricate and install the washer (54), u-cup (53), and bearing (52). U-cup must face toward the cylinder. 49 20 1 Apply lubricant. 2 Lips face toward cylinder. ti15259a FIG. 11.
Repair 31 2 4 45 35 1 40 1 37 1 5 38 1 Apply grease. 2 Apply thread lubricant. 3 Torque to 100-120 in-lb (11-14 N•m). 4 Torque to 91-109 ft-lb (123-148 N•m). 5 Lips face toward cylinder. 5 1 1 39 1 41 3 2 42 ti14535a FIG. 14. Piston v-packings 13. Grease the outside of the displacement rod shaft and the piston, near the hexes. Push the rod and the piston into the cylinder (27). 14.
Repair 312793H 15
Parts Parts Models with V-Packings 10 3 1 1 9 2 31 8 4 2 1 7 Lips face down. 12 1 20 21 26 24 25 24 25 24 23 2 32 33 34 36 1 45 1 47 46 32 1 44 5 22 14 6 2 27 1 35 19 40 2 5 37 6 1 5 3 1 4 3 39 28 6 37 29 Lips face up. 39 1 37 15 17 38 41 18 42 4 2 ti15222a 1 Apply grease. 2 Apply thread lubricant. 4 Torque to 54-66 ft-lb (73-89 N•m). 3 Torque to 100-120 in-lb (11-14 N•m). 5 Torque to 74-86 ft-lb (100-117 N•m).
Parts Models with V-Packings NOTE: Many parts are available in one or more Service/Repair kits. See page 20.
Parts Models with U-Cup Packings 10 3 9 8 2 1 1 31 7 2 12 20 U-cup faces down. 32 33 34 36 49 50 51 19 5 3 1 28 14 6 1 5 3 1 4 6 1 45 27 2 2 6 21 1 1 4 29 47 46 32 1 44 5 2 1 54 U-cup faces up. 53 52 1 15 41 17 18 42 4 2 ti15261a 1 Apply grease. 2 Apply thread lubricant. 4 Torque to 54-66 ft-lb (73-89 N•m). 3 Torque to 100-120 in-lb (11-14 N•m). 5 Torque to 74-86 ft-lb (100-117 N•m). 18 6 Torque to 91-109 ft-lb (123-148 N•m).
Parts Models with U-Cup Packings NOTE: Many parts are available in one or more Service/Repair kits. See page 20. Ref.
Repair Kits Repair Kits LB050A LB050B 24E713 LB100A LB100B 24E714 LB150A LB150B 24E715 V-Packing Seal Kit Includes: springs (22, 35), glands (23, 26, 38, 40), v-packings (24, 25, 37, 39), and o-rings (2, 12, 21, 32, and 41) 24A655 24A656 24A657 U-Cup Seal Kit Includes: throat u-cup (50), bearing (49), and spring clip (51); piston u-cup (53), bearing (52), and washer (54).
Optional Kits Optional Kits * Kit Description LB050A LB050B LB100A LB100B LB150A LB150B Reinforced PTFE V-Packing Kit* Reinforced PTFE throat packings and glands, reinforced PTFE piston packings and glands, o-rings, and springs 24J858 24J859 24J860 PTFE Bellows Kit* Includes PTFE bellows and o-rings 24J850 24J851 24J851 316 Stainless Steel Check Ball Kit** Includes: Check balls (34, 47), ball stop spring (36), and o-rings (2, 12, 21, 32 and 41).
Dimensions Dimensions Displacement Pump Dimensions Displacement Pump A (Height*) in. (mm) B C (Inlet Size) (Outlet Size) in. npt in. npt LB050A, LB050B 23.6 (599) 3/4 in. 3/8 in. 26 (11) LB100A, LB100B 23.6 (599) 3/4 in. 3/8 in. 30 (13) LB150A, LB150B 23.6 (599) 1 in. 3/4 in. 34 (15) Weight lbs (kg) B * Height measured at midstroke.
Technical Data Technical Data Maximum fluid working pressure LB050A and LB050B LB100A and LB100B . . . . . . . . . . . . . . . . . . . . . . . . . LB150A and LB150B . . . . . . . . . . . . . . . . . . . . . . . . . Maximum fluid inlet pressure . . . . . . . . . . . . . . . . . . . . . . Maximum fluid temperature . . . . . . . . . . . . . . . . . . . . . . . Ambient temperature range . . . . . . . . . . . . . . . . . . . . . . . Stroke length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Standard Warranty Graco warrants all equipment referenced in this document which is manufactured by Graco and bearing its name to be free from defects in material and workmanship on the date of sale to the original purchaser for use. With the exception of any special, extended, or limited warranty published by Graco, Graco will, for a period of twelve months from the date of sale, repair or replace any part of the equipment determined by Graco to be defective.
