are removed.
If primary or secondary static seal seats (80) are
still fitted to the rotor case take care not to
damage them on the shaft ends (24 & 25). If
single flushed seals are fitted take care not to
damage them on the shaft splines or shims (30).
Re-fitting:
•
Refit any seal housings removed (6.6 SEAL
HOUSINGS) to the rotor case.
•
Refit the rotor case (noting dowel for rotation)
and torque the four hexagon head socket
screws (52) to the torque specified in Table 6
– Rotor case torque table.
Pump Size
HP 32/34
Rotor case Bolt
HP 42/44
Rotor case Bolt
HP 52/54
Rotor case Bolt
HP 62/64
Rotor case Bolt
LH 72/74/76
Rotor case Bolt
Table 5 – Rotor case torque table
6.8 ROTOR CLEARANCE -
CHECKING & ADJUSTMENT
HP & LH pumps have very small, carefully
controlled clearances between rotors and rotor
case. Scimitar meshing clearances and Radial
clearances (shown a & b) are factory set and
cannot be changed. Axial clearances and Tri lobe
meshing clearances (shown c and d) are
adjustable if incorrect. (Figure 29, 30, 31, 32 &
Table 6).
Figure 29 - clearance measuring
Fixing
Torque Nm
8
10
20
20
50
Figure 30 - Shim / clearance measuring
Figure 31 - Shim / clearance measuring
30