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Single, Double, T riple and Thru-drive Pumps Overhaul Service Manual V-PUVN-TS001-E October 2002
Section III —
Principles of
Operation (cont.)
E. Outlet Bodies
Two outlet body configurations
and two shaft seal arrange-
ments are available for the
series 30 VMQ pumps. See
Figures 6a and 6b.
Double shaft seal models
utilize a drain hole opening
between the two seals. This
drain hole is used to prevent
cross contamination between
the gearbox and the pump.
If one seal were to fail, the
fluid would drain through the
hole and not past the opposing
seal. Series 30 VMQ pumps
use shaft seals that are rated at
20 PSIG (1.38 bar). Higher
pressure shaft seals are
available. See your Danfoss sales
representative for further
details.
Section IV –
Installation and
Operating Instructions
A. Installation Drawings
See the series 30 VMQ
product catalog for installation
dimensions.
B. Mounting and Driv e Connections
Danfoss high performance vane
pumps are designed for foot or
flange mounting.
1. Direct Drive. A pilot on the
pump mounting flange (Figure
7) assures correct mounting
and shaft alignment, provided
the pilot is firmly seated in the
accessory pad of the power
source. Care should be
exercised in tightening all
flange mounting screws to
prevent misalignment.
If gaskets are used between
flanges, they should be
installed carefully so as to lie
flat and should not be the type
that will take a set. Shaft keys
and couplings must be properly
seated to avoid slipping and
possible shearing.
Proper coupling alignment is
essential to prolong pump life.
Primary Seal
Primary Seal
Secondary Seal
Figure 6a.
Single Shaft Seal Models
Figure 6b.
Double Shaft Seal Models
Drain Hole
Summary of Contents for Vickers VMQ125S
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