Orbit PP Series, Installation And Operating Instructions Manual

Page: 14 / 30

12
12. DISMANTLING
Before any maintenance work is carried out on the pump, ensure that the pump is isolated from the
electrical supply and that the pump's main isolating valves on the inlet and outlet are closed.
Ensure that the system is de-pressurised.
Where hazardous fluids are pumped, the pump must be flushed and drained before the
dismantling. Personnel dismantling the pump must wear protective clothing throughout the
dismantling procedure.
If the pump has been out of operation for more than one hour, it will assist dismantling if the rotor is given a slight
turn, thereby breaking the rotor/stator seal. Where a pump has been out of operation for a longer period of time,
dismantling can be facilitated by lubricating the rotor/stator assembly with water through the filling plug holes,
and rotating the rotor.
To dismantle the pump, follow the below sequence (reference to Figure 1 : Exploded view):
1. Remove suction end cover (01) holding down bolts.
2. Remove tie rod (39) nuts and washers (61 & 62) and end cover (01).
3. Remove stator (05) by simultaneously pulling and twisting.
4. To separate the flexshaft (33) and rotor (04) from pump, place suitable spanners on flats of
mainshaft adaptor nut (29) and rotor adaptor nut (30). Adaptor nut (29) may need to be heated to
degrade the thread bonding agent.
Hold mainshaft adaptor nut (29) stationary and unscrew rotor adaptor nut (30) clockwise (left hand
thread).
ORBIT PP AGRICULTURAL INSTALLATION AND OPERATIONS MANUAL