Mityvac MVM8903 Pump Rebuild Kit - Manual

Page Section
- MV86 - 1
Form 824566 APR - 2009
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 Hous-
ing (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)
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
MVM8903
Pump Rebuild Kit
23
* Lubricate with Silicone Oil
3
2
1
4
5
6
7
8
9
10
20
11
14 15
22
13
12
13
19
3
18
16
17
Pump Body