Diaphragm Vacuum Pump N 828 / N 838
Servicing
Translation of original Operating and Installation Instructions, english, KNF 121249-121517 09/19
41
Fig. 28: Section for AN_-version (pump head made of aluminum)
a.) Preparatory steps
1. Remove the pump from the source of electrical power. Make
sure the pump is voltage-free and secure it.
2. Only for models with DC motors (no cooling fan): Remove
cover (
5
) from pump housing after loosening the four screws.
On these models, which have no fan, where reference is made
to turning or holding the cooling fan, the necessary operations
must be carried out by turning or holding the counterweight
(
10
).
b.) Remove pump head
1. Mark the position of the head plate (
3
), intermediate plate (
2
),
and housing (
1
) relative to each other by a drawing line (
M
)
with a felt-tip marker. This helps avoid incorrect assembly later.
2. Undo the 4 screws (
4
) in the head plate and lift the head plate
with the intermediate plate off the pump housing.
Fig. 27: One-headed pump
(N 828 ANE)
Specification
1
Housing
2
Intermediate plate
3
Head plate
4
Screw
5
Cover
6
Valve plate/sealing
7
Structured Diaphragm
8
Diaphragm spacer
9
Connection rod
10
Counter weight
M
Mark
