Graco 563918 User manual

3A2603D

Repair

MVB Pump Piston

and Seal Repair Kit

Used to repair pistons and seals used in MVB pumps. For professional use only.

Model No.:

563918 - MVB Pump 1/4 Piston Kit

8000 psi (55.2 MPa, 552 bar) Maximum Working

Pressure

563919 - MVB Pump 3/8 Piston Kit

3000 psi (20.7 MPa, 207 bar) Maximum Working

Pressure

563920 - MVB Pump Seal Kit

Important Safety Instructions

Read all warnings and instructions in this manual

and in your MVB Pump instruction manual included

with your unit. Save all instructions.

Installation

2 3A2603D

Installation

Pressure Relief Procedure

1. Disconnect power source.

2. Loosen outlet fitting or alternate outlet. (FIG. 1)

Disassembly

Reference numbers used in the following instructions

refer to Parts, page 4.

1. Relieve pressure and remove pump from MVB

box.

2. Place pump upside down in a soft-jaw vise.

3. Depress piston guide (6) and remove self locking

ring (8e) and piston guide (6), ring retainer (8c), lock

washer (8g), piston retainer spring (1) and retention

spring (4) from the pump cylinder.

4. Remove pump from vise and turn it over. Replace

pump in soft-jaw vise with adjustment nut facing

upward.

5. Loosen set screw (8j) to relieve locking force on

cylinder and piston assembly. Removing the set

screw entirely is not necessary.

6. Remove pipe plug (8h). Unthread and remove

cylinder assembly (5).

NOTE:

• Care should be taken when removing cylinder

assembly. Do not cut or damage o-rings

(7b - 7e).

• Hold (a) (FIG. 2) with a 13/16 wrench when

removing pipe plug.

7. Inspect o-rings and backup rings (7b-7h) as

necessary. Replace damaged o-rings and

backup rings.

8. Remove pump cylinder from vise.

9. Place valve assembly (5) in vise and remove

indicator port adapter (a) (FIG. 2).

10. Remove valve assembly (5) from vise and remove

spring (3) and check ball (8a) from pump cylinder.

11. Inspect components and replace as needed.

SKIN INJECTION HAZARD

This equipment stays pressurized until pressure is

manually relieved. To help prevent serious injury such

as skin injection from pressurized fluid, follow the

Pressure Relief Procedure when you stop dispensing

and before cleaning, checking, or servicing the

equipment.

FIG. 1

FIG. 2

Installation

3A2603D 3

Reassembly

Reference numbers used in the following instructions

refer to Parts, page 4.

NOTE: Lubricate all o-rings and retaining rings (7 and 8)

with grease prior to installation

1. Reassemble o-rings, retaining rings (7) and

indicator port adapter (a) on piston valve assembly

(5). Refer to parts illustration provided on 4 for

proper orientation when reassembling these parts.

2. Place pump cylinder in soft-jaw vise right side up.

Install check ball (8a) and spring (3) in pump.

3. Install piston valve assembly (5) in pump cylinder.

4. Install pipe plug (8h).

NOTE:

• Hold (a) (FIG. 2) with a 13/16 wrench when

installing pipe plug.

5. Remove pump cylinder from vise and turn it over.

Replace pump in soft-jaw vise.

6. Install retention spring (4), spring retainer (1), ring

retainer, piston guide (6) and self locking ring (8e)

through bottom of pump cylinder.

7. Press on the piston guide (6) to assure free

movement of the piston.

8. Reinstall the pump on the MVB Gearbox.

9. Remove the pipe plug (8h) from the top of the

indicator adapter.

10. Bleed the pump of all air by cycling the pump until

oil flows from the port.

11. Re-install the plug (8h).

12. Set the adjustment to the desired output (page 4).

13. Tighten the cylinder retaining screw.

All written and visual data contained in this document reflects the latest product information available at the time of publication.

Graco reserves the right to make changes at any time without notice.

Original instructions. This manual contains English. MM 3A2603

Graco Headquarters: Minneapolis

International Offices: Belgium, China, Japan, Korea

GRACO INC. AND SUBSIDIARIES • P.O. BOX 1441 • MINNEAPOLIS MN 55440-1441 • USA

www.graco.com

Revision D, February 2022

Parts

FIG. 3

Ref Part Description Qty

1 556495 RETAINER, spring

(kits 563918, 563920)

556496 RETAINER, spring

(kits 563919, 563920)

2 556726 GASKET, pump 1

3 556960 SPRING, piston 1

4 557012 SPRING, piston 1

5 563115 VALVE, piston, 1/4 cylinder

(kit 563918)

563119 VALVE, piston, 3/8 cylinder

(kit 563919)

6 560469 GUIDE, piston (kit 563918, 563919) 1

7 558015 KIT, MVB Pump Seal 1

7a BALL, 0.188 diameter 1

7b O-RING, backup, -015 flurocarbon 1

7c O-RING, backup, -017 flurocarbon 1

7d O-RING, -019 flurocarabon 1

7e O-RING, -012 flurocarbon 1

7f RING, backup, -19, PTFE 2

7g RING, backup, -17, PTFE 2

7h RING, backup, -015 PTFE 2

8 558016 KIT, MVB Pump Hardware 1

8a BALL, chrome, .500 1

8b TAG, direction (not shown) 1

8c❊RING, retainer, -25 E-ring 1

8f RING, retainer, 1-1/2 1

8e★RING, retainer, 3/8

8g WASHER, lock, 3/8 2

8h PLUG, 1/8 nptf 1

8j PLUG, pipe, 1/4 nptf 2

8k SCREW, HHCS 1/4 x 0.37 1

❊1/4 in. piston size only

★3/8 in. piston size only

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