Unibloc-Pump UNIBLOC-PD 501, Руководство по эксплуатации и обслуживанию

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12 UNIBLOC-PD Operation & Service Manual: PD501-576
3.0 Shaft Seal Service
To aid in the removal and installation of the shaft seals, plastic
mounting sleeves that are the same diameter as the shafts at the seal
area are available. The mounting sleeves also protect the seals from
the shaft splines. Contact an authorized service center, or Uni-
bloc-Pump, to obtain these tools.
Before proceeding with the following steps,
DISENGAGE POW-
ER TO THE HYDRAULIC OR PTO DRIVE
. If the pump is con-
nected to piping, depressurize the system and close valves on both
the suction and discharge sides to isolate the pump from the rest of
the system. Disconnect the piping from the pump.
Remove the front cover nuts (16) and the front cover (2). Place a
nonmetal object between the rotors (3a,3b) to keep them from turn-
ing. Unscrew the rotor bolts (14a,14b) and then slide the rotors off
the shafts. If the rotors will not slide off they can be removed simul -
taneously with the rotor housing (1). Unless they are being replaced,
DO NOT USE PLIERS OR CHANNEL LOCKS TO REMOVE
THE ROTORS
. They will be damaged. See the following sections
for further instructions to remove the rotor housing.
Figure 3.0
3.1 Double O-Lip
TM
Seal
This type of seal is most frequently used with liquids that are very difficult to seal because of high viscosity. The seal comes as a
single cartridge that is easily serviced. The maximum shaft rotational speed for this seal is 1.5 m/s (4.8 ft/s), or 500 rpm, and the
maximum service pressure should not exceed 10 bar (150 psig). The seal does not require external lubrication and can be run dry
for short periods. This seal comes as standard on UNIBLOC 501, 551, 576.
3.1.1 Double O-Lip
TM
Seal Removal
If the rotors were removed, the rotor housing does not need to be taken off.
The seal cartridges (61) can be removed by placing screwdrivers between
the rotor housing and gearbox and pushing them out. Be aware that the
wear sleeve (80) can slide off with O-lip seal when removing the seal car -
tridge (61).
3.1.2 Double O-Lip
TM
Seal Installation
Check the shaft sleeves for wear. If grooves are noticeable, they may have
to be replaced. Place new o-rings (49) into the groove of the seal cartridges.
Clean the rotor housing seal bores. Apply product compatible lubricant to
the bores and the shafts. Slide the assembly sleeves on the splined shaft
ends. These must be used to prevent damage to the O-lip seal. Push the seal
cartridges (61) in, lip side last, so that they are flush with the back of the
rotor housing. See section 3.3 for completing the installation.
Figure 3.1