TECHNICAL FAQ

IS THE PUMP DIGITALLY CONTROLLED?
The pump's entire range of functions and operations is managed digitally through 12 VDC solenoids.

HOW DOES THE PUMP GO INTO SAFE START-UP MODE?
At startup, all cylinders can either be manually set or programmed to default to the Safe mode state. In this mode:
- All cylinders will be shifted to no outlet flow mode.
- Intake flow is redirected back to the tank through a “low-pressure drop” solenoid, to prevent cylinder filling.
- Pistons will be held at Top Dead Center (TDC) as there is no new injection flow to keep them in contact with actuators.

CAN FIXED DISPLACEMENT BE PROVIDED?
Switching to fixed displacement is accomplished by a simple flip of a switch, preventing pilot pressure from engaging the load sensing and pressure cut-off systems.

CAN OUTLET FLOW BE REDUCED ON DEMAND?
Depending on the chosen pump configuration, flow on demand has the capability to achieve reductions, with flow levels as low as 1% of the total flow. For example, a 40 GPM pump can operate at full RPM and full pressure while delivering as little as 0.4± GPM.

DOES THE PUMP HAVE SINGLE OR MULTIPLE OUTLET PORTS?
The pump can be configured with a single or multiple outlets, depending on the pump configuration; single, double, or triple rows of pistons. For more details, refer to the Ports page.

HOW DOES THE CHARGE PUMP WORK?
The pump configuration allows for the choice of a single or multiple outlets, depending on the arrangement of pistons—options include single, double, or triple rows. For more details, refer to the Ports page.

HOW DOES A BUILT-IN ERS WORK?
A modified Pelton-wheel-like turbine, situated in the main front housing, is driven by kinetic energy to assist the rotation of the main shaft. An overrunning clutch enables the turbine to spin the shaft, while preventing the main shaft from turning the turbine.

WHAT HAPPENS TO THE CASE DRAIN?
The Tonand pump distinguishes itself from current pumps with a deliberate design choice—having only a single point of internal oil leakage, specifically through the crucial pistons' blow-by. The blow-by volume, along with other lubricating and cooling volumes in the housing, is systematically drawn back, filtered, cooled, and reused as desired. Notably, the case drain can operate at high pressure without elevating the housing pressure beyond 14.7 PSI. This case drain recovery mechanism opens the door to significantly enhancing pump efficiency.

CAN THIS PUMP PROVIDE POTENTIAL-PENDING CATASTROPHIC FAILURE WARNING?
The updated pump features an internal configuration that enables continuous live monitoring of each individual working piston. Any discrepancies in a cylinder can trigger both visual and audible warnings.

CAN THE PUMP WORK IN OPEN LOOP WITH CYLINDERS AND MOTORS?
The new pump exhibits excellent performance in open-loop operations, effectively meeting the flow requirements for both motors and cylinders. Operating without the need for components such as swashplate, slippers, port plate, bias spring, rotating cylinder block, stroke control piston, and more, the Tonand pump utilizes distinct means for providing variable flow, differing significantly from the current pump.

IS THE PUMP SELF-PRIMING?
The Tonand pump utilizes the charge pump to extract oil from the tank and distribute it to the main cylinders. Consequently, the main pistons are dedicated solely to generating outlet flow.