Graco 312794E User Manual

Instructions - Parts

Merkur Assembly

For high-performance finishing and coating applications in hazardous or non-hazardous locations. For professional use only.

Important Safety Instructions

Read all warnings and instructions in this manual. Save these instructions.

See page 4 for model information, including maximum working pressure.

Pump

312794E

ENG

TI12811a

ll 2 G

Contents

Pump Part Number Matrix . . . . . . . . . . . . . . . . . . . 3

Pump Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

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

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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

Prepare the Operator . . . . . . . . . . . . . . . . . . . . . 8

Prepare the Site . . . . . . . . . . . . . . . . . . . . . . . . . 8

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Mount the Pump . . . . . . . . . . . . . . . . . . . . . . . . . 9

Air and Fluid Hoses . . . . . . . . . . . . . . . . . . . . . . . 9

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Typical Installation . . . . . . . . . . . . . . . . . . . . . . . 10

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Pressure Relief Procedure . . . . . . . . . . . . . . . . 11

Flush Before Using Equipment . . . . . . . . . . . . . 11

Trigger Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Wet Cup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Prime and Adjust the Pump . . . . . . . . . . . . . . . 12

Shutdown and Care of the Pump . . . . . . . . . . . 12

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Preventive Maintenance Schedule . . . . . . . . . . 13

Tighten Threaded Connections . . . . . . . . . . . . . 13

Flush the Pump . . . . . . . . . . . . . . . . . . . . . . . . . 13

Wet Cup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

General Information . . . . . . . . . . . . . . . . . . . . . . 15

Disconnect the Displacement Pump . . . . . . . . . 15

Reconnect the Displacement Pump . . . . . . . . . 16

Disconnect the Air Motor . . . . . . . . . . . . . . . . . . 17

Reconnect the Air Motor . . . . . . . . . . . . . . . . . . 17

Pump Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Parts That Vary by Model . . . . . . . . . . . . . . . . . 19

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

Performance Charts . . . . . . . . . . . . . . . . . . . . . . . . 21

Pump Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 28

Wall Bracket Mounting Dimensions . . . . . . . . . . . 29

Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 30

Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 30

2 312794E

Pump Part Number Matrix

Check your pump’s identification plate (ID) for the 6-digit part number. Use the following matrix to define the construction of your pump, based on the six digits. For example, Part No. W 1 5 A A S represents a wet cup pump (W), 15 to 1 ratio (15), 25 cc lower (A), 3 UHMWPE/2 PTFE packings with chromex rod coating, no data monitoring, low noise exhaust (A), and stainless steel construction (S).

W15 A A S

Second and

Third Digits First Digit (Wet cup)

W10A25 cc A 3:2/Chromex/No Monitoring/Low Noise S Stainless

(pressure

ratio - XX:1)

15 B 50 cc B 18 C 75 cc E

23 D 100 cc 24 E 125 cc 28 F 150 cc 30 36 45 48

Fourth Digit

(Displacement pump

volume per cycle*)

(Packings - X UHMWPE:X PTFE/

Data Monitoring/Exhaust)

3:2/Chromex/DataTrak 3:2/Chromex/DataTrak

Only/Low Noise

Fifth Digit

Piston Rod Coating/

™

/Low Noise

™

Cycle Count

Sixth Digit

(lower

material)

steel

ti12922a

* Cycle refers to combination of one upstroke and one downstroke.

312794E 3

Pump Models

Maximum Fluid

Air

Model, Series

W10CAS, Series A M04LN0 W10CBS, Series A M04LT0 W15AAS, Series A M02LN0 LW025A 1500 (10.3, 103) 0.4 (1.5) 1/2 in. npt 3/8 in. npt 1/4 npt(f) W15BAS, Series A M04LN0 W15BBS, Series A M04LT0 W15FAS, Series A M12LN0 W15FBS, Series A M12LT0 W18EAS Series A M12LN0 W18EBS, Series A M12LT0 W23DAS, Series A M12LN0 W23DBS, Series A M12LT0 W24FAS, Series A M18LN0 W24FBS, Series A M18LT0 W28EAS, Series A M18LN0 W28EBS, Series A M18LT0 W30AAS, Series A M04LN0 W30ABS, Series A M04LT0 W30CAS, Series A M12LN0 W30CBS, Series A M12LT0 W36DAS, Series A M18LN0 W36DBS, Series A M18LT0 W45BAS, Series A M12LN0 W45BBS, Series A M12LT0 W48CAS, Series A M18LN0 W48CBS, Series A M18LT0

Motor

Displacement

Pump

LW075A 1000 (6.9, 69) 1.2 (4.5) 3/4 in. npt 3/8 in. npt 1/4 npt(f)

LW050A 1500 (10.3, 103) 0.8 (3.0) 3/4 in. npt 3/8 in. npt 1/4 npt(f)

LW150A 1500 (10.3, 103) 2.4 (9.0) 1 in. npt 3/4 in. npt 1/2 npt(f)

LW125A 1800 (12.4, 124) 2.0 (7.5) 1 in. npt 1/2 in. npt 1/2 npt(f)

LW100A 2300 (15.8, 158) 1.6 (6.0) 3/4 in. npt 3/8 in. npt 1/2 npt(f)

LW150A 2400 (16.5, 165) 2.4 (9.0) 1 in. npt 3/4 in. npt 1/2 npt(f)

LW125A 2800 (19.3, 193) 2.0 (7.5) 1 in. npt 1/2 in. npt 1/2 npt(f)

LW025A 3000 (20.7, 207) 0.4 (1.5) 1/2 in. npt 3/8 in. npt 1/4 npt(f)

LW075A 3000 (20.7, 207) 1.2 (4.5) 3/4 in. npt 3/8 in. npt 1/2 npt(f)

LW100A 3600 (24.8, 248) 1.6 (6.0) 3/4 in. npt 3/8 in. npt 1/2 npt(f)

LW050A 4500 (31.0, 310) 0.8 (3.0) 3/4 in. npt 3/8 in. npt 1/2 npt(f)

LW075A 4800 (33.1, 331) 1.2 (4.5) 3/4 in. npt 3/8 in. npt 1/2 npt(f)

Working Pressure

psi (MPa, bar)

Flow Rate at 60 cpm gpm (lpm)

Fluid

Inlet

Fluid

Outlet Air Inlet

4 312794E

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 symbol refers to procedure-specific risk. Refer back to these warnings. Additional, product-specific warnings may be found throughout the body of this manual where applicable.

WARNING

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.

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 forms from distributor or retailer.

• 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.

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 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.

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

• Engage trigger lock when not spraying.

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

312794E 5

Related Manuals

PRESSURIZED EQUIPMENT HAZARD

Fluid from the gun/dispense valve, leaks, or ruptured components can splash in the eyes or on skin and cause serious injury.

• Follow Pressure Relief Procedure in this manual, when you stop spraying and before cleaning,

• Tighten all fluid connections before operating the equipment.

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

MOVING PARTS HAZARD

Moving parts can pinch 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,

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 MSDS’s 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 impervious gloves when spraying or cleaning equipment.

WARNING

checking, or servicing equipment.

follow the Pressure Relief Procedure in this manual. Disconnect power or air supply.

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, inhalation of toxic fumes, burns, and hearing loss. This equipment includes but is not limited to:

• Protective eyewear

• Clothing and respirator as recommended by the fluid and solvent manufacturer

•Gloves

• Hearing protection

Related Manuals

Manual Description

312792 Merkur Displacement Pump 312796 312797 Merkur Non-Heated Spray Packages

312798

313255 Merkur Heated Spray Packages

™

NXT

Air Motor

Merkur Electrostatic Spray Packages, Ambient and Heated

6 312794E

Component Identification

FIG. 1. Component Identification

Key:

A Ground Wire B TSL Reservoir C Wet Cup (not visible, under TSL reservoir) D Fluid Outlet E Fluid Inlet F Lower Cylinder G Upper Cylinder H Tie Rod Shield J Displacement Pump Adapter KTie Rod L Coupling Nut MJam Nut N Air Motor

ti11700a

312794E 7

Installation

General Information

Reference numbers and letters in parentheses in the text refer to the callouts in the figures and the parts drawing.

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.

Prepare the Operator

All persons who operate the equipment must be trained in the operation of all system components as well as the proper handling of all fluids. All operators must thoroughly read all instruction manuals, tags, and labels before operating the equipment.

Prepare the Site

Pump: See F

attached and tightened securely to the air motor. Connect the other end of the ground wire (U) to a true earth ground.

FIG. 2. Ground screw and wire

Air and fluid hoses: Static electricity may build up

when fluids flow through pumps, hoses, and sprayers. At least one hose must be electrically conductive, with a maximum of 500 ft. (150 m) combined hose length to ensure grounding continuity. Check electrical resistance of hose. If total resistance to ground exceeds 25 megohms, replace hose immediately.

IG. 2. Verify that the ground screw (GS) is

ti12914a

Ensure that you have an adequate compressed air supply.

Bring a compressed air supply line from the air compressor to the pump location. Be sure all air hoses are properly sized and pressure-rated for your system. Use only electrically conductive hoses.

Keep the site clear of any obstacles or debris that could interfere with the operator's movement.

Have a grounded, metal pail available for use when flushing the system.

Grounding

The equipment must be grounded. Grounding reduces the risk of static and electric shock by providing an escape wire for the electrical current due to static build up or in the event of a short circuit.

Air compressor: follow manufacturer’s recommendations.

Spray gun / Dispense valve: Ground the spray gun through connection to a Graco-approved grounded fluid hose.

Fluid supply container: follow local code.

Object being sprayed: follow local code.

Solvent pails used when flushing: follow local code.

Use only conductive metal pails, placed on a grounded surface. Do not place the pail on a nonconductive surface, such as paper or cardboard, which interrupts grounding continuity.

To maintain grounding continuity when 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.

8 312794E

Installation

Mount the Pump

Mount the pump only to Graco wall bracket 15T795, or to a Graco cart, available from your distributor. Pump dimensions are shown on page 28. For wall mounted pumps, follow these guidelines:

1. Be sure the wall can support the weight of the pump, bracket, hoses and accessories, as well as the stress caused during operation.

2. Position the wall bracket about 1.2-1.5 m (4-5 ft) above the floor. For ease of operation and service, make sure the pump air inlet, fluid inlet, and fluid outlet ports are easily accessible.

3. Using the wall bracket as a template, drill 10 mm (0.4 in.) mounting holes in the wall. Wall mounting dimensions are shown on page 29.

4. Attach the bracket to the wall. Use 9 mm (3/8 in.) screws that are long enough to keep the pump from vibrating during operation.

NOTE: Be sure the bracket is level.

• Pump air regulator (H): controls pump speed and

outlet pressure. Locate it close to the pump.

• Air line filter (B): removes harmful dirt and mois-

ture from compressed air supply.

• Air shutoff valve (A): isolates air line accessories

for servicing. Locate upstream from all other air line accessories.

• Gun air regulator (D): controls air pressure to the

air-assisted spray gun.

Fluid Line

• Fluid filter (P): with a 60 mesh (250 micron) stain-

less steel element to filter particles from the fluid as it leaves the pump.

• Fluid drain valve (W): required in your system, to

relieve fluid pressure in the hose and gun.

• Gun or valve (L): dispenses the fluid. The gun

shown in F to medium viscosity fluids.

IG. 3 is an air-assisted spray gun for light

Air and Fluid Hoses

Be sure all air hoses (N) and fluid hoses (M) are properly sized and pressure rated for your system. See F

3. Use only electrically conductive fluid hoses.

IG.

Accessories

Install the following accessories in the order shown in F

IG. 3, using adapters as necessary.

Air Line

• Bleed-type master air valve (E): required in your system to relieve air trapped between it and the air motor and gun when the valve is closed.

Trapped air can cause the pump to cycle unexpectedly, which could result in serious injury from splashing or moving parts.

• Fluid line swivel (K): for easier gun movement.

• Suction kit (V): enables the pump to draw fluid from

a container.

Be sure the valve is easily accessible from the pump and located downstream from the air regulator.

312794E 9

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