Page 200 - Vetus

HYDRAULIC PUMPS

VETUS hydraulic pumps are variable volume, load sensing, piston pumps and are able to provide full hydraulic flow and pressure
at all PTO/ prime-mover engine speeds, providing the engine is producing enough power at those speeds. These pumps adjust
themselves to meet the requirement of the activated user devices, and when no hydraulic flow is required, stop pumping and
freewheel, so no clutch is required at the Power Take Off (PTO) on which the pump is mounted.

Hydraulic pumps are assembled from modules, with many possible arrangements of port locations, mounting flange size, shaft size
and type, and direction of rotation. The pumps in the table below will work well for most situations and are available from stock,
but VETUS will supply whatever pump is needed for a particular system. For an engine mounted PTO, a pump with rear connections
is required, to avoid the pump ports being covered by the engine block or oil pan. In general, a gearbox mounted PTO will be the
most convenient, with all round access to pump ports for hose connections.
The direction of rotation of the PTO drive shaft determines the required direction of rotation of the pump, and they will be
opposites, when both PTO and pump are viewed looking toward the end of the shaft. A right hand/clockwise PTO needs a left
hand/anticlockwise pump and vice versa. In order to transmit the power of the prime-mover engine on which the PTO is mounted,
the pump must produce the pressure and flow required by the user devices. To accomplish that power transmission, a pump
or pumps is selected with sufficient capacity to produce the required flow at the speed of the PTO(s), allowing for appropriate
volumetric inefficiency in the pump(s).

For pumps mounted on propulsion engines or propulsion gearboxes, the PTO speed is taken when the engine is idling, to allow for
full hydaulic power to thrusters during docking manoeuvers. For most modern diesel engines idling speed will be between 600 and
700 rpm. For pumps mounted on genset PTOs, the speed of the PTO is taken at the normal operating speed of the genset engine, as
listed in the genset manuals (usually 1500, 1800 or 3000 pm).
Your VETUS hydraulic support engineer will work with you to select the correct pumps and all other equipment for your installation,
but remember that the engines, gearboxes or gensets must be ordered with appropriate Power Take Offs (PTOs), so early planning
of the hydraulic system is essential. Retrofitting PTOs is very expensive and may be impossible.
Each hydraulic pump in the system will have four hose connections: The suction line to draw low pressure oil from the reservoir
tank, the high pressure line (P) delivering high potential energy hydraulic fluid to the control valve assembly, the load sensing line
(LS) from the valve assembly that controls the output of the pump, and the case drain (D) that prevents hydraulic fluid that has
bypassed the internal mechanisms of the pump from accumulating at high pressue in its case. It is important to understand that
each pump must have a single load sensing connection. In a multi user-device system, shuttle valves may be required so that the
pump provides hydraulic fluid at the highest pressure required by any of the user devices in operation. Other user devices in the
system requiring lower pressures will be protected by crossover/bypass valves.

Standard hydraulic pumps stocked by VETUS
Non-standard pumps are made to order.
Part Code Pump capacity Direction of Shaft Weight Torque in Newton Suction and Available Max
(cc) Rotation lbs Metres for each pressure SAE cont
(fluid pumped in (kg) bar of operating port location flange rpm
one revolution) approx pressure *
HT1015SD2 45 LH - anticlockwise 13 spline 59.5 (27) 0.72 rear SAE B 2 bolt 2800
HT1015E62 62 LH - anticlockwise 13 spline 53 (24) 1 rear SAE B 2 bolt 2600
HT1016SD1 30 LH - anticlockwise 13 spline 53 (24) 0.48 side SAE B 2 bolt 3200
HT1016SD2 45 LH - anticlockwise 13 spline 59.5 (27) 0.72 side SAE B 2 bolt 2800
HT1017E62 62 RH - clockwise 13 spline 53 (24) 1 rear SAE B 2 bolt 2600
HT1017SDI 30 RH - clockwise 13 spline 53 (24) 0.48 side SAE B 2 bolt 3200
HT1017SD2 45 RH - clockwise 13 spline 59.5 (27) 0.72 side SAE B 2 bolt 2800
HT1022SD / SDH 75 LH - anticlockwise 14 spline 59.5 (27) 1.2 side SAE C 4 bolt 2400
HT1023SD / SDH 75 RH - clockwise 14 spline 59.5 (27) 1.2 side SAE C 4 bolt 2400
HT1016SD3 100 LH - anticlockwise 17 spline 123 (56) 1.6 side SAE C 4 bolt 2450
HT1016SD4 130 LH - anticlockwise 17 spline 123 (56) 2.1 side SAE C 4 bolt 2200
HT1027** 45 RH - clockwise 13 spline 59.5 (27) 0.72 side SAE B 2 bolt 2800
* It may be necessary to reduce pump pressure to avoid exceeding the maximum allowed torque for the PTO, even if that means reduced power
for the user device.
** This pump is configured to mount on the PTO of a John Deere diesel engine.
All pumps come standard with a connection kit.

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