2 EATON 420 Mobile Piston Pump Technical Manual E-PUPI-TM002-E4 November 2014
Introduction
Eaton’s 420 Series mobile pumps are open circuit,
axial piston designs with displacements of 41cc, 49cc,
62cc, and 80cc for operating speeds up to 2,650 rpm.
They are available with a variety of control options to
match their performance to a broad range of mobile
applications.
The highly efcient pump controls reduce cooling
system requirements, allowing a smaller and less
expensive design to be used. Or, cooling capacity can
be kept the same and the ow capability of the system
increased to improve performance.
A strong, eld-proven rotating group allows the
pumps to handle pressures to 280 bar (4000 psi)
continuous and 320 bar (4600 psi) intermittent – with
less maintenance cost. 420 Series pumps use a saddle-
type swashplate with steel-backed polymer bearings
and a pressure lubrication passage to reduce wear and
support internal loads.
The swashplate is very stiff, which reduces deection
and allows even loading of the bearings to extend
the unit’s service life. The combination of high load
capacity bearings and a stiff drive shaft help provide
a pump B10 bearing life of 3320 hours at rated mobile
conditions, reducing operating costs and extending
operating life.
A single control piston is used to vary pump output.
This design reduces the forces acting on the
swashplate, resulting in reduced package size, which
allows pump installation into tighter locations.
In response to customer expectations and regulatory
requirements, Eaton has designed the 420 Series
pumps to operate at very low noise levels. A
bimetal timing plate is used to improve pump lling
characteristics which further reduces uid-borne noise
and extends pump life.
Both SAE and ISO mounting ange congurations are
available as well as SAE and ISO tube- and ange-
type ports. Side- or end-ported models are available to
facilitate plumbing and help t the pump to machine
space needs, as are multiple drain ports to allow many
mounting orientations.
Typical Applications
• Loader backhoes
• Vibratory cable plows
• Mining machinery
• Dump truck lifts
• Agriculture tractors
• Chemical applicator trucks
• Railroad equipment
• Container handling, all-terrain,
and truck cranes
• Vibratory cable plows
• Mining machinery and tunnel
boring equipment
• Utility boom, off-road dump,
and refuse trucks
• Material handling trucks and
rough terrain fork lifts
• Concrete and asphalt pavers
• Feller/bunchers, forwarders,
and log loaders
• Crawler dozers
• Articulate haulers
• Mini-excavators
Features and Benets
• Long pump life
• Quiet pump operation
• Low installed and
operating costs
• Reduced maintenance
• Flexibility in machine design
• Compact size saves space
• Design promotes leak-free
system
420 Series Mobile Piston Pump
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