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Idiomas disponibles
Idiomas disponibles
9.13
Transmission of power from the second PTO
Upon request, VHT series pumps can be supplied with an
auxiliary PTO on the opposite side to the drive (Transmission
of power from the second PTO).
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:
65 Nm which corresponds to:
7 HP at 750 rpm;
7.4 HP at 800 rpm;
8.3 HP at 900 rpm;
9.3 HP at 1000 rpm;
11.1 HP at 1200 rpm.
By means of the joint, withdrawable Max Torque is:
130 Nm which corresponds to:
14 HP at 750 rpm;
14.8 HP at 800 rpm;
16.6 HP at 900 rpm;
18.6 HP at 1000 rpm;
22.2 HP at 1200 rpm.
By means of the V-belt, the transmission is
considered suitable if: belt pull is applied at a
max distance of 22 mm from the bend shaft
shoulder Fig. 13. Min diameter of pulley to be
used = Ø 100 mm.
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 pressurized
(see par. 9.4 - 9.5 - 9.6) 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 is free discharge, to
permit rapid expulsion of the air present in the pump
manifold and therefore facilitate 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 level, verified with a dipstick
(Fig. 14, pos. ) and exceptionally with a level indicator
(Fig. 14, pos. ).
In case of prolonged storage or long-term
inactivity, check proper functioning of the
suction and outlet valves.
10.2
Start-up
1. At first start-up, verify that the rotation direction and the
supply pressure are correct.
2. Start-up the pump without any load.
3. Check that the supply pressure is correct.
4. Check that the rotation rpm during operation does not
exceed the nominal rpm of the pump.
5. Let the pump run for a period 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 and reduce to a
minimum rpm (activation with combustion motors).
11
PREVENTIVE MAINTENANCE
For pump reliability and efficiency, comply with maintenance
intervals as shown in the table.
PREVENTIVE MAINTENANCE
Fig. 13
Every 500 hours
Check oil level
12
PUMP STORAGE
12.1
Long-term inactivity
If the pump is started for the first time after a long
period from the date of shipment, before operation
check the oil level, inspect the valves as specified
in chapter 10, then follow described start-up
procedures.
31
Fig. 14
Every 1000 hours
Change oil
Check / Replace:
Valves
Valve seats
Valve springs
Valve guides
Check / Replace:
H.P. seals
L.P. seals
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