Packo HP64 - Rotor Clearance Adjustment

30
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
Fixing
Torque Nm
HP 32/34
Rotor case Bolt
8
HP 42/44
Rotor case Bolt
10
HP 52/54
Rotor case Bolt
20
HP 62/64
Rotor case Bolt
20
LH 72/74/76
Rotor case Bolt
50
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
Figure 30 - Shim / clearance measuring
Figure 31 - Shim / clearance measuring