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Type SMW

Type LMW

Type XW

Type XW30

Type XWH

Type XWJ

Comparison of pump types


Ultra compact for given pressure and flow rates
Flow/pressure combinations within 1.7 Kw range
– up to 2.18 l/m or up to 690 bar
All externally exposed components 316 stainless steel
No external lubrication or cooling systems
Direct coupled option with horizontal mounting.

The 1.7Kw type SMW hydraulic pump is specifically designed for water-based fluids. Separation of the lubricating oil and the pumped fluid is achieved by the installation of a cavity between the cylinder block and the case. Bypass from the pistons is collected in this cavity and returned to the inlet side of the pump. The SMW pump incorporates three, four or six axial pistons actuated by a single rotating swash plate.


Rotation is bi-directional and the pump may be mounted horizontally or vertically. Vertical motor pump units are supplied with a bellhousing and coupling. Horizontal units have the option of direct coupling between the pump and motors from 71 to 90 frame size.

A suction filter of 150 microns or better should be used. Finer filtration is desirable for the pump life, but is important that the inlet flowrate to the pump is not restricted and no more than -2 in.Hg is measured in the suction pipework under pumping conditions. Where possible a positive pressure should be maintained in the suction pipework under flowing conditions. When the pump is stationary the suction line should be kept under positive pressure to allow priming.

Important - pumps are delivered from Marshalsea with the case lubricating oil drained. Before the pumps are used, the case should be filled with Castrol Alphasyn PG150 to the level specified on the pump technical data sheet


All external components manufactured from 316 stainless steel – pump shaft is medium carbon steel EN8.


15 Kg

Pump characteristics options

Part Number Cylinders Flow Flow @ 1450 RPM Flow @ 1750 RPM Pressure
cc/rev l/m Usg/m l/m Usg/m bar
SMW-00-00052-0690-3-4-CC-VH-XX-XX 3 0.52 0.75 0.199 0.91 0.240 690
SMW-00-00062-0690-3-4-CC-VH-XX-XX 3 0.62 0.90 0.239 1.09 0.288 690
SMW-00-00069-0690-4-4-CC-VH-XX-XX 4 0.69 1.00 0.265 1.21 0.320 690
SMW-00-00083-0690-4-4-CC-VH-XX-XX 4 0.83 1.21 0.318 1.45 0.384 690
SMW-00-00104-0560-6-4-CC-VH-XX-XX 6 1.04 1.51 0.398 1.82 0.480 560
SMW-00-00125-0465-6-4-CC-VH-XX-XX 6 1.25 1.81 0.477 2.18 0.576 465

Additional Options

Mounting Option

SMW - Direct coupling to IEC 71 Frame B35 Flange motors (Horiz mount only)
SMW85 - Direct coupling to IEC 80 Frame B35 Flange motors (Horiz mount only)
SMW95 - Direct coupling to IEC 90 Frame B35 Flange motors (Horiz mount only)
SMWS - Shaft driven pump for use with a Bellhousing and Coupling (Vertical and Horiz mount)


H - Horizontal
V - Vertical (SMWS Only)

Inlet Connection Options

03 - 1/2" BSP Female Inlet
08 - 1/2" NPT Female Inlet

Outlet Connection Options

01 - 1/4" BSP Female Connection
03 - 1/2" BSP Female Connection
06 - 1/4" NPT Female Connection

Shaft coupled pump dimensions

Direct coupled pump dimensions - IEC 75 Frame B35 Flange Mount Shown

© Marshalsea Hydraulics Limited – a member of the Bifold Fluidpower group of companies.

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