Mityvac MVM8900 User Manual

Installation Instructions

MVM8900

Pump Rebuild Kit

17

For replacement of parts 1 through 15

1. Remove Dual Converter Knob Screw (1) using
small Phillips head screwdriver

2. Pull off the Dual Converter Knob (2)

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

4. Remove the two Valve Housing Screws (4)

5. Remove the Valve Housing from the Pump Body

6. Remove the Front Seal Retainer assembly from
the cylinder of the Pump Body

7. With your thumb, push the Piston Assembly (8)
into the Pump Body cylinder. This will compress
the Piston Spring (9) and cause the Piston Rod
to extend from the back of the Pump Body as­sembly.

8. With the Piston Rod extended, remove the Pis­ton Rod Pin (10) and Pump Handle.

9. Remove the Piston Assembly (18) from the
Pump Body cylinder.

10. Remove the two Back Cap Screws (11).

11. Remove the Back Cap

12. Note the direction of the Piston Rod Seal (12).

The new seal must be installed in the same
direction (cup side inward) for the pump to func­tion properly.

13. Remove the Piston Rod Seal (12).

* Lubricate with Silicone Oil

14. Lightly lubricate* the new Piston Rod Seal (12)
and install into Pump Body.

15. Replace the Back Cap, and secure it with the
Back Cap Screws (11).

16. Clean and lightly lubricate* the inside of the
Pump Body cylinder.

©

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

18. Assemble new Piston Spring (9) onto Piston
Assembly (8) and install into Pump Body cylin­der.

19. With your thumb, push the Piston Assembly (8)
into the Pump Body cylinder. This will com­press the Piston Spring (9) and cause the Pis­ton Rod to extend from the back of the Pump
Body assembly.

20. Assemble the pump handle onto the Piston
Rod end and install the Piston Rod Pin (10).

21. Remove the old O-ring (5) and Umbrella Valve
(6) from the Front Seal Retainer.

22. Install the new O-ring (5) onto the Front Seal
Retainer.

JAN - 2009

PATENT PENDING

Form 801519

Section

© Indicates change

- MV71

Page

- 1A

MVM8900
Pump Rebuild Kit

23. Install the new Umbrella Valve (6) onto the
Front Seal Retainer by inserting the stem
through the center hole of the Front Seal Re­tainer. Be sure the stem extends forward.

24. Trim approximately 1/4 inch off of the umbrella

valve stem.

25. Install the Front Seal Retainer assembly into

the front of the Pump Body cylinder.

26. Remove the Duckbill Valve (13) from the Valve

Housing and install new.

27. Remove the Valve Housing O-ring (14) from the

Valve Housing and install new.

28. Install the Valve Housing onto the Pump Body.

29. Lightly lubricate the three new Dual Converter

Valve O-rings (15), and install them onto the
new Dual Converter Valve (3).

30. Carefully slide the Dual Converter Valve

Assembly into the Valve Housing with the stem

extending through the valve housing.

31. Properly align the Dual Converter Knob (2) with

the notch on the end of the Dual Converter
Valve stem, and install the knob. Secure it with
the Dual Converter Knob Screw (1)

For replacement of Schrader Valve (16)

1. Remove the Lever Pin Retaining Ring, Lever

Pin, and Release Lever

2. Use the Schrader Valve Tool (17) to unthread

and remove the Schrader Valve (16)

3. Install the new Schrader Valve (16) using the

Schrader Valve Tool (17).

4. Reinstall Release Lever, Lever Pin and Lever Pin

Retaining Ring.

Americas:

One Lincoln Way

St. Louis, MO 63120-1578

USA

Phone [phone]

Fax [phone]

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 China

Web site:
www.lincolnindustrial.com

Page Number - 2

Form 801519