12
SOFT START WIRING
Pumps equipped with a soft start valve require a time
delay relay. Install the relay to activate the soft start
valve 3 seconds after the PTO is engaged.
On the 60 CC Rexroth pump, the soft start valve is
mounted off of the pressure port fitting. The coil
includes 2 lead wires to connect to 12 VDC. The
polarity is not critical
.
KEY POINTS
1.
Always mount the pump with the case drain on
top. Pump failure will occur if the case drain port
is on the bottom of the pump.
Improperly
installing the case drain will void the
warranty.
2.
If used, ensure the soft start valve (mounted on
pump) is wired to a time delay relay or is
multiplexed so that the
soft start solenoid
activates 3 seconds after the PTO
has been
engaged. If there are any secondary or remote
switches, be sure that they cannot be activated
prior to 3 seconds of PTO engagement.
3.
All PTO manufacturers require PTO engagement
below 1000 rpm. High-speed engagement will
cause catastrophic damage to the PTO and/or the
pump. A high-speed lock out may be prudent.
Consult with your PTO manufacturer for more
information.
4.
Use sweeping 90° fittings whenever possible.
5.
Consider making a heat shield for your pump.
This will help reduce heat radiation and will
protect the exhaust and other components from
oil in the event of a hydraulic leak such as hose
failure. Configure the shield so that any oil is
directed down and away from the exhaust.
Although a heat shield is not required, it is a
good safety device.
Figure 8: Pump Case Drain Orientation