19
4. Maintenance 4.3 Disassembly
Step 1
Before disassembling the pump refer to safety
precautions. See exploded view drawings (chapter 6).
Removing rotorcase cover
Remove rotorcase cover nuts (13) and cover (12).
Step 2
Removing rotors
1. Insert a plastic/wooden block between the two rotors (17)
to stop them turning.
2. Remove rotor retention nuts (22) and rotors. Pump
models S6 rotors are retained by torque locking
assemblies, TLA’s (19) and can be removed by:
- Loosening each TLA screw in several stages in a
diametrically opposite sequence.
- Use bolts to screw into two of the TLA holes (fitted
with washers) and extract the TLA’s.
Plastic or
wooden block
Step 3
Removing rotorcase
1. For packed gland seals loosen the gland followers to relieve
the packing pressure on the shaft.
For flushed mechanical seal arrangements, remove the seal
housing retaining nuts and ease the seal housings from the
rotorcase.
2. Remove rotorcase retaining nuts (4) and washers (4A).
3. Tap both sides of the rotorcase (9) with a soft mallet.
4. Take care not to damage mechanical seals.
The
rotorcase must not be allowed to drop onto the shafts (24
and 25) during the removal process.
5. Shims (8) should not be removed unless rotor clearances
require resetting.
Step 4
Draining pump lubrication
1. Place a tray under the gearcase to collect the waste
lubricating oil.
2. Remove the lower drain plug (45) at the side of the gearcase
(1).
