Transmission Of Power From The Second Pto; Start-Up And Operation; Preliminary Checks; Start-Up - Pratissoli MW Serie Manual De Uso

9.11

Transmission of power from the second PTO

Upon request, MW series pumps can be supplied with an
auxiliary PTO on the opposite side to the drive.
Transmission can be carried out:
- By means of the V-belts
- By means of the joint
By means of the V-Belts, withdrawable Max Torque is: 150 Nm
corresponding to 12.5 kW (17HP) at 800 rpm.
By means of the joint, withdrawable Max Torque is: 220 Nm
corresponding to 18.4 kW (25HP) at 800 rpm.
With transmission by means of the joint, pay
particular attention to perfect alignment so that
no transverse forces are generated on the pump
shaft.
For applications differing from those specified
above, contact our Technical or Customer Service
Departments.
10

START-UP AND OPERATION

10.1

Preliminary checks

Before start-up, ensure that:
The suction line is connected and pressurised
(see chapter 9): the pump must never run dry.
1. The suction line ensures a hermetic seal over time.
2. Any shut-off valves between the supply source and
the pump are fully open. The outlet line during is free
discharge, to permit air present in the pump head to come
out quickly and therefore favour fast priming.
3. All suction and outlet fittings and connections are
properly tightened.
4. The coupling tolerances on the pump/transmission axis
(half-joint misalignment, Cardan joint tilt, belt pulling,
etc.) remain within limits required by the transmission
manufacturer.
5. Oil in the pump casing is at the required level, verified with
a dipstick (pos. , Fig. 8).
In case of prolonged storage or long-term
inactivity, you need to restore the proper
functioning of the suction valves by opening the
three valve-lift devices (see pos.  Fig. 9). Make
sure you have closed the valves before starting
the pump.
For the "work" and "rest" positions, see Fig. 10.
VALVE CLOSED -
WORK POSITION -
10.2

Start-up

1. At first start-up, verify that the rotation direction is correct.
2. Check the pump is fed correctly.
3. Start-up the pump without any load.
4. Check that the rotation rpm during operation does not
exceed the nominal rpm of the pump.
5. Let the pump run for a time of no less than 3 minutes,
before putting it under pressure.
6. Before each pump stop, reset pressure by means of the
control valve or with any relieving devices.
Should there be any priming trouble due to
insufficient supply, it is possible to remove the
three plugs in front of the head as shown in pos.
ƒ Fig. 11 and Fig. 11/a.
Fig. 8
53
SAFETY DEVICE VALVE OPEN - REST
RELEASE POSITION -
Fig. 9
Fig. 10
Fig. 11