20
Step 7
Removing timing gears
1. Release clamp plate screws (40) on pump models S1, 2
and 3. Release the torque locking assembly screws in
several stages on pump models S4, 5 and 6.
2. Remove gears (36) using the tapped extraction holes
provided, or remove shaft assembly as shown in step 8
below.
4.3 Disassembly 4. Maintenance
Step 5
Removing seal retainers
1. Remove screws (15).
2. Then remove seal retainers (14) - as a liquid sealant has
been used a lever may be required to remove retainers.
3. The lip seals (16) can be removed using a screwdriver/
lever once the seal retainers are removed. It is essential to
renew the lip seals and it is recommended that new
gaskets or sealant be used prior to reassembly.
Step 8
Shaft assembly removal
1. Using a soft mallet gently tap the rear end of each shaft (24
and 25), to remove through the front of the gearcase (1).
2. Support each shaft during removal from the gearcase.
3. Remove the shaft abutment spacer (27) from:
- On models S1, 2, 3 and 4 and horizontally ported 5 and
6 pumps, the bearing bore opposite the rotorcase
mounting face with the additional machining mark.
- On models S5 and 6 vertically ported pumps, the right
hand bearing bore when viewed from the front of the
pump.
Step 6
Removing Gearcase Cover
1. Remove screws (6).
2. Remove gearcase cover (5) after breaking the gasket seal
then press out the lip seal (7). It is essential to renew the lip
seal prior to reassembly.
