Graco 332246EN-B User Manual

Repair-Parts

Repair Kits

Accessory Kits

See page 10

®

Merkur

High Pressure

Displacement Pump

High pressure carbon steel pump for protective coatings.
For professional use only.

See page 2 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 sprayer manual. Hazard sym­bols refer to specific procedure risks. Save all
instructions.

332246B

EN

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Related Manuals

Contents

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

Component Identification . . . . . . . . . . . . . . . . . . . . 3

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Repair Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 14

Related Manuals

Manual Description

312796

332245 Merkur High Pressure Sprayers

407053 Merkur X48 Rebuild Kit

407054 Merkur X72 Rebuild Kit

Models

Check your displacement pump’s identification marking for the 6-digit
part number. Displacement pumps use a Chromex coated rod, 3 UHM­WPE, and 2 PTFE packings.

NXT

™

Air Motor

To order replacement parts, see Parts section starting on page 8.

Maximum Working

Pressure

Model, Series Description

16U917, Series A Merkur X48 Pump

16U916, Series A Merkur X72 Pump

* Cycle refers to combination of one upstroke and one down stroke.

psi (MPa, bar)

4800 (33, 330) 75 1-1/4 in. npt 3/8 in. npt

7200 (50, 500) 50 1-1/4in. npt 3/8 in. npt

Displacement

Pump Volume

Per Cycle* in cc Fluid Inlet

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Fluid

Outlet

2 332246B

Component Identification

Component Identification

F

IG

. 1. Component Identification

A

B

C

F

E

G

D

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Key:

A Piston/Rod Assembly
BWet Cup
C Fluid Outlet
D Fluid Inlet
E Lower Cylinder
F Upper Cylinder
G Intake Valve

332246B 3

Repair

Repair

General Information

NOTICE

Threads are very sharp. To avoid cuts, use a rag to
protect hands when hand turning or carrying the dis­placement pump.

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.

Preparation

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

1. Flush the equipment.

2. Relieve the pressure.

3. Remove the displacement pump from the pump
assembly.

Disassembly

Lay out all removed parts in sequence to ease
reassembly. Clean all parts with a compatible solvent
and inspect them for wear or damage.

1. Place cylinder (1)
sideways in a
vise with soft
jaws.

2. Use an adjustable
wrench on hex of
intake housing
(23) to unscrew it
from the lower
cylinder (2).
Loosen vice
briefly and tip out
the ball (24◆).

3. Remove the seat (22†) and use an o-ring pick to
remove the seal (26†) from the intake housing. See
F

IG

. 7.

4. Use an adjustable wrench on hex of lower cylinder
(2) to remove it from the upper cylinder (1) and slide
it straight off the pump. Be careful not to damage
the piston/rod assembly (3).

5. Remove the o-ring (21*†) from the top of the lower
cylinder.

6. Loosen the wet cup (5).

7. Pull the piston/rod assembly out the bottom of the
upper cylinder. Remove the spring (10*), piston
packings (12* and 13*) and glands (11* and 14*).

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NOTICE

Repair Kits are available. See the chart on page 10
to order the correct kit(s) for your pump.

• Parts included in the Seal Repair Kit are
marked with an *, for example 8*.

• Parts included in the Seat Repair Kit are
marked with a †.

• Parts included in the Check Ball Kit are
marked with a ◆.

4 332246B

8. Remove the wet cup (5).

9. Remove the throat packings (7*, 8*) and glands (6*,
9*) from the bottom of the wet cup.

NOTICE

The jam nut can remain attached to the upper cyl­inder.

10. Remove the spring (4*) from the top of the upper
cylinder (1).

Repair

11. Remove the upper cylinder seal (28*).

12. Clamp the piston in a vice. Use a hex wrench to
remove the nut (17†) from end of piston.

• 16U916: 7 mm (1/4 in.) hex

• 16U917: 13 mm (1/2 in.) hex

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F

IG

. 2. Remove Flow-Through Nut

Reassembly

1. Clean and inspect all parts.

NOTICE

Replace all o-rings removed from the pump. Com­pressed o-rings may cause the pump to leak.

2. Lubricate and install upper cylinder seal (28*).

3. Assemble the female gland (9*), v-packings (7*, 8*),
and male gland (6*), as shown. Alternate the
v-packings with the lips facing down. Lubricate the
packings. Install the packing stack into the wet
cup (5).

5

*9

*7

*8

13. Remove the o-ring (18†), seat (15†) and ball (16◆).
See F

IG

. 5.

*7
*8

*7

Lips must
face down.

*6

*28

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F

IG

. 3. Replace Throat Packings

4. Install the spring (4*) in the top of the upper cylinder.

NOTICE

All threads, packings, and seals must be well lubri­cated. Use Lubriplate (Graco Part Number

285791) or a similar product.

5. Lubricate the threads and screw the wet cup (5) into
the upper cylinder (1), hand tight.

332246B 5