Superseded - parts are not interchangeable Be careful not to scratch or damage
Measurement required Note correct orientation
Flatness specification Mark orientation for reinstallation
Parallelism specification Torque specification
External hex head Press in - press fit
Internal hex head Pull out with tool – press fit
Torx head Cover splines with installation sleeve
O-ring boss port Pressure measurement/gauge location or
specification
The symbols above appear in the illustrations and text of this manual. They are intended to communicate
helpful information at the point where it is most useful to the reader. In most instances, the appearance
of the symbol itself denotes its meaning. The legend above defines each symbol and explains its purpose.
Design
Danfoss Series 40 M46 closed-circuit axial-piston pumps convert input torque into hydraulic power. The
input shaft transmits rotational force to the cylinder block. Bearings at the front and rear of the pump
support the input shaft. Splines connect the cylinder block to the input shaft. A lip-seal at the front end of
the pump prevents leakage where the shaft exits the pump housing. The spinning cylinder block
contains seven reciprocating pistons. A ball joint connects a brass slipper to each piston. A spring washer
and the force of charge pressure holds the slippers to the swashplate. The reciprocating movement of the
pistons occurs as the slippers slide against the inclined swashplate during rotation. Via the valve plate,
one half of the cylinder block connects to low pressure and the other half to high pressure. As each piston
cycles in and out of its bore, fluid displaces from inlet to outlet imparting hydraulic power into the
system. A small amount of fluid flows from the cylinder block/valve plate and slipper/swashplate
interfaces for lubrication and cooling. The pump also uses excess flow from the charge pressure relief
valve for cooling. Case drain ports return this fluid to the reservoir. A gerotor-style charge pump provides
this flow and maintains a minimum pressure in the system loop.
The angle of the swashplate controls the volume of fluid displaced into the system. The servo piston sets
swashplate angle. The pump control modulates servo piston position by varying differential pressure
across the piston.
Service Manual
Series 40 M46 Variable Pumps
Introduction
©
Danfoss | September 2017 11026743 | AX00000027en-US0202 | 7
To Next Page
Loading...
Need help?
General
