Graco 312793H User Manual

Repair/Parts

Merkur

™

Bellows

312793H

Displacement Pump

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.

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Related Manuals

Contents

Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Important Two-Component Material Information . 5

Isocyanate Conditions . . . . . . . . . . . . . . . . . . . . . 5

Material Self-ignition . . . . . . . . . . . . . . . . . . . . . . 5

Keep Components A and B Separate . . . . . . . . . 5

Moisture Sensitivity of Isocyanates . . . . . . . . . . . 5

Changing Materials . . . . . . . . . . . . . . . . . . . . . . . 5

Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Component Identification . . . . . . . . . . . . . . . . . . . . 7

Related Manuals

Manual Description

312795 Merkur Bellows Pump Assembly

312796

312799 Merkur Bellows Spray Packages, AA and

312798 Merkur Electrostatic Spray Packages

™

NXT

Airless

Air Motor

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

General Information . . . . . . . . . . . . . . . . . . . . . . . 8

Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Replace the Bellows . . . . . . . . . . . . . . . . . . . . . . 9

Complete Pump Repair . . . . . . . . . . . . . . . . . . . 11

Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Repair Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Optional Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 24

Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 24

2 312793H

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.

WARNING

WARNINGWARNINGWARNING

FIRE AND EXPLOSION HAZARD

Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help prevent fire and explosion:

• Use equipment only in well ventilated area.

• Eliminate all ignition sources; such as pilot lights, cigarettes, portable electric lamps, and plastic drop cloths (potential static arc).

• Keep work area free of debris, including solvent, rags and gasoline.

• Do not plug or unplug power cords, or turn power or light switches on or off when flammable fumes are present.

• Ground all equipment in the work area. See Grounding instructions.

• Use only grounded hoses.

• Hold gun firmly to side of grounded pail when triggering into pail.

• If there is static sparking or you feel a shock, stop operation immediately. Do not use equipment until you identify and correct the problem.

• Keep a working fire extinguisher in the work area.

SKIN INJECTION HAZARD

High-pressure fluid from gun, hose leaks, or ruptured components will pierce skin. This may look like just a cut, but it is a serious injury that can result in amputation. Get immediate surgical treatment.

• Do not spray without tip guard and trigger guard installed.

• Engage trigger lock when not spraying.

• Do not point gun at anyone or at any part of the body.

• Do not put your hand over the spray tip.

• Do not stop or deflect leaks with your hand, body, glove, or rag.

• Follow the Pressure Relief Procedure when you stop spraying and before cleaning, checking, or servicing equipment.

• Tighten all fluid connections before operating the equipment.

• Check hoses and couplings daily. Replace worn or damaged parts immediately.

312793H 3

Warnings

WARNING

WARNINGWARNINGWARNING

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. For complete information about your material, request MSDS from distributor or retailer.

• Do not leave the work area while equipment is energized or under pressure. Turn off all equipment and follow the Pressure Relief Procedure 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.

• Use equipment only for its intended purpose. Call your distributor for information.

• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.

• Do not kink or over bend hoses or use hoses to pull equipment.

• Keep children and animals away from work area.

• Comply with all applicable safety regulations.

MOVING PARTS HAZARD

Moving parts can pinch, cut or amputate fingers and other body parts.

• Keep clear of moving parts.

• Do not operate equipment with protective guards or covers removed.

• Pressurized equipment can start without warning. Before checking, moving, or servicing equipment, follow the Pressure Relief Procedure and disconnect all power sources.

SUCTION HAZARD

Powerful suction could cause serious injury.

• Never place hands near the pump fluid inlet when pump is operating or pressurized.

TOXIC FLUID OR FUMES HAZARD

Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled, or swallowed.

• Read MSDSs to know the specific hazards of the fluids you are using.

• Store hazardous fluid in approved containers, and dispose of it according to applicable guidelines.

• Always wear chemically impermeable gloves when spraying, dispensing, or cleaning equipment.

PERSONAL PROTECTIVE EQUIPMENT

You must wear appropriate protective equipment when operating, servicing, or when in the operating area of the equipment to help protect you from serious injury, including eye injury, hearing loss, inhalation of toxic fumes, and burns. This equipment includes but is not limited to:

• Protective eyewear, and hearing protection.

• Respirators, protective clothing, and gloves as recommended by the fluid and solvent manufacturer.

4 312793H

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. If sufficient ventilation is not available, a supplied-air respirator is required for everyone in the work area.

To prevent contact with isocyanates, appropriate personal protective equipment, including chemically impermeable gloves, boots, aprons, and goggles, is also required for everyone in the work area.

Material Self-ignition

Some materials may become self-igniting if applied too thickly. Read material manufacturer’s warnings and material MSDS.

Moisture Sensitivity of Isocyanates

Isocyanates (ISO) are catalysts used in two component coatings. ISO will react with moisture (such as humidity) to form small, hard, abrasive crystals, which become suspended in the fluid. Eventually a film will form on the surface and the ISO will begin to gel, increasing in viscosity. If used, this partially cured ISO will reduce performance and the life of all wetted parts.

NOTE: The amount of film formation and rate of crystallization varies depending on the blend of ISO, the humidity, and the temperature.

To prevent exposing ISO to moisture:

• Always use a sealed container with a desiccant dryer in the vent, or a nitrogen atmosphere. Never store ISO in an open container.

• Use moisture-proof hoses specifically designed for ISO, such as those supplied with your system.

• Never use reclaimed solvents, which may contain moisture. Always keep solvent containers closed when not in use.

• Never use solvent on one side if it has been contaminated from the other side.

• Always lubricate threaded parts with ISO pump oil or grease when reassembling.

Changing Materials

Keep Components A and B Separate

Cross-contamination can result in cured material in fluid lines which could cause serious injury or damage equipment. To prevent cross-contamination of the equipment’s wetted parts, never interchange component A (isocyanate) and component B (resin) parts.

312793H 5

• When changing materials, flush the equipment multiple times to ensure it is thoroughly clean.

• Always clean the fluid inlet strainers after flushing.

• Check with your material manufacturer for chemical compatibility.

Most materials use ISO on the A side, but some use ISO on the B side.

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.

To order replacement parts, see Parts section starting on page 16. The digits in the matrix do not correspond to the reference numbers in the Parts drawings and lists.

L B 100 A

Third, Fourth, and Fifth

Digits

(Displacement Pump First Digit

Second Digit

(Material)

Volume Per Cycle in

cc)

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Sixth Digit

(Packings/Seals)

(Lower)

Part Number Series

LB050A LB050B

LB100A LB100B

LB150A LB150B

Bellows Style

A 4500 (33.1, 310 3/4 in. npt 3/8 in. npt

A 3600 (24.8, 248) 3/4 in. npt 3/8 in. npt

A 2400 (16.5, 165) 1 in. npt 3/4 in. npt

050 A

100 B

150

Maximum Working

Pressure

psi (MPa, bar)

V-Packings (3 UHMWPE, 2 PTFE)

U-Cup Seal

Fluid Inlet Fluid Outlet

6 312793H

Component Identification

E F

FIG. 1. Component Identification

Key:

A Connecting Rod B Top Cap C Pump Fluid Inlet D Bellows Chamber E Packing Nut F Cylinder G Pump Fluid Outlet H Pump Adapter J Foot Cap

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312793H 7

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

Follow all warnings and instructions in your pump manual for the following preliminary steps:

1. Flush the equipment.

2. Stop the pump close to the middle of the stroke.

3. Relieve the pressure.

4. Disconnect the air and fluid hoses and the ground wire.

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. To avoid damage to the top cap and the D-shaped seal, do not

turn the coupling nut.

8. Lower the coupling nut and remove the coupling collars.

FIG. 2. Remove coupling collars.

9. Push up the motor shaft. Remove the coupling nut.

hold

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turn

5. Remove the shield.

NOTE: If the overflow chamber (optional accessory) contains fluid, unscrew the bottle (103) and discard. See F

. 4. If it has not been used, the bottle can remain

attached to the cap.

To avoid the buildup of electrostatic charge, do not rub the plastic bottle with a dry cloth while it is attached to the pump. Remove the bottle to clean, if needed.

10. Cart Mount: Tilt the cart onto its back to service the displacement pump.

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FIG. 3. Tilt pump for repair.

8 312793H

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