Mityvac MVM8903 User Manual

MVM8903

Pump Rebuild Kit

19

12

13

Pump Body

5

20

7

9

13

3

16

10

18

17

11

14

6

8

15

22

4

2

1

23

3

For replacement of parts 1 through 16

1. Remove Dual Converter Knob Screw (15)

2. Remove Dual Converter Knob (14)

3. Remove the Dual Converter Valve (12) by
pushing the stem through the Valve Hous­ing (11)

4. Remove the two Valve Housing Screws (3)

5. Remove the Valve Housing (11) from the
Pump Body

6. With your thumb, push the Piston Assembly
(7) into the Pump Body cylinder. This will
compress the Piston Spring (6) and cause
the Piston Rod (5) to extend from the back
of the Pump Body assembly

7. With the Piston Rod extended, remove the
Piston Rod Pin and Pump Handle (1)

8. Remove the Piston Assembly (7) from the
Pump Body cylinder

9. Remove the two Back Cap Screws (3)

10. Remove the Back Cap (2)

* Lubricate with Silicone Oil

11. Note the direction of the Piston Rod Seal
(4) the new seal must be installed in the
same direction (cup side inward) for the
pump to function properly

12. Remove the Piston Rod Seal (4)

13. Lightly lubricate* the new Piston Rod Seal
(4) and install into Pump Body

14. Replace the Back Cap (2), and secure it
with the two new Back Cap Screws (3)

15. Clean and lightly lubricate the inside of the
Pump Body cylinder

16. Lightly lubricate the new Piston Seal (8)
and install onto the new Piston Assembly
(7)

17. Assemble new Piston Spring (6) onto new
Piston Assembly (7) and install into Pump
Body cylinder

18. With your thumb, push the Piston Assembly
(7) into the Pump Body cylinder. This will
compress the Piston Spring (6) and cause
the Piston Rod to extend from the back of
the Pump Body assembly

APR - 2009

Form 824566

Section

- MV86

Page

- 1

MVM8903
Pump Rebuild Kit

19. Assemble the pump handle (1) onto the
Piston Rod end and install the new Piston
Rod Pin (5)

20. Install the new O-ring (9) onto the new
Front Valve Housing (11)

21. Install new Duckbill Valve (10) into the new
Valve Housing (11)

22. Install new Valve Housing (11) onto the
Pump Body using two new Valve Housing
Screws (3)

23. Lightly lubricate the three new Dual Con­verter Valve O-rings (13), and install them
onto the new Dual Converter Valve (12)

24. Carefully slide the Dual Converter Valve As­sembly into the new Valve Housing with the
stem extending through the valve housing

25. Properly align the new Dual Converter
Knob (14) with the notch on the end of the
Dual Converter Valve stem, and install the
knob. Secure it with the new Dual Convert­er Knob Screw (15)

26. Install new Schrader Valve (16) into the
new Valve Housing (11) using the Schrader
Valve Tool (23)

27. Remove the Lever Pin Retaining Ring (18),
Lever Pin (19), and Lever (17) from the old
Valve Housing (11) and install onto the new
Valve Housing

Americas:

One Lincoln Way

St. Louis, MO 63120-1578

USA

Phone [phone]

Fax [phone]

Page Number - 2

Europe /Africa/Middle East

Lincoln GmbH

Heinrich-Hertz-Str. 2-8

69190 Walldorf - Germany

Phone/Fax [phone]

www.lincolnindustrial.de

Asia/Pacic:

51 Changi Business Park

Central 2

#09-06 The Signature

Singapore 486066

Phone [phone]

Fax [phone]

© Copyright Lincoln Industrial
Corporation 2009
Printed in USA

Web site:
www.lincolnindustrial.com

Form 824566