Viking Pump TSM280: Duralobe (Discontinued) - Manual (Page 41)

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4.2.2 Cartridge to Rotorcase Assembly
see Fig 23.
- If not already installed, mount feet (1) to rotorcase (item 40 see fig 5.6)
in the required positions using caphead screws (2). Install the relevant
product seal housing (28, 44, 47 or 156) with associated gasket or o-
ring or lipseal (single flushed and double flushed mechanical seals
only) and wave spring (single mechanical seal only) to the rear of the
rotorcase (40) and secure with screws (26).
- Install o-rings (25) to front diameter of bearing sleeves (20).
- Assemble cartridges into rotorcase (40) rear bores insuring that timing
marks on the timing gears (14) are in mesh (single dot on drive shaft
gear, two dots on driven shaft gear). The timing gears are in correct
mesh when the single dot on the drive shaft gear is between the two
dots on the driven shaft gear. Leave a small gap between rear face of
rotorcase (40) and cartridge mounting face for inserting shims (22).
- Insert shims (22) between rotorcase (40) and cartridge. Shims can be
plastic or steel and are either marked with their thickness or are color
coded as follows :
Blue = 0.050mm thick (0.002”)
Green = 0.075mm thick (0.003”)
Clear = 0.150mm thick (0.006”)
White = 0.250mm thick (0.010”)
- Secure cartridges to rotorcase (40) with cap head screws (23),
tightening to correct torque, refer to section 5.2.
- Install rotors (41), refer to section 4.2.3.
- Using a depth micrometer or similar device measure "actual" rotor front
clearance. This is the clearance between the front face of the rotorcase
and the front face of the rotor. Select "required" front clearance (A)
from the Clearance Chart, refer to section 5.1. The difference between
the "actual" measured clearance and the "required" clearance, as given
on the Clearance Chart, is the amount of shim (22) that needs to be
removed or added.
- Having determined the amount of shim (22) to be removed or added,
remove rotors (41), refer to section 4.1.1. Remove cap head screws
(23). Taking care not to damage the shims (22), ease cartridge from
rotorcase (40) using lever slots to create a gap to access the shims
(22). Remove or add appropriate amount of shim between rotorcase
(40) and shaft cartridge flange.
- Secure cartridges to rotorcase (40) with cap head screws (23)
tightening to correct torque, refer to section 5.2.