SPX TG H15-50, Instruction Manual, Page: 62 / 110

62 A.0500.351 – IM-TGH/07.02 EN (10/2015)
C. Reverted packing PR
When pumping chocolate, the packing needs to be tightened bit by bit at the (initial) start-up
in order to achieve the utmost minimum of leakage, just enough to lubricate the packing rings.
Excessively leaking chocolate can overheat in the packing, causing caramelisation, resulting
in extra wear of the packing. If the packing leaks excessively or when the pump needs serve,
the old packing rings must be replaced. This can only be done by disassembling bearing and
bearing bracket.
Regularly check the external grease supply in order to make sure that bush bearing is sufficiently
greased, especially at start-up. Pay attention to the compatibility of the grease with the pumped
liquid.
D. Mechanical seal
If the mechanical seal leaks excessively, it must be replaced with one of the same type.
Note! The materials of the mechanical seal are selected strictly in accordance with the nature of
the pumped liquid and the operating conditions. Thus the pump must only handle the liquid
for which it was purchased. If the liquid or operating conditions are changed, a mechanical
seal suitable for the new operating conditions must be fitted.
3.21.4 Front pull-out
The TG-pumps also have a front pull-out
system. To remove liquid residues or to check
the idler bearing for wear, the pump cover can
be pulled out from the pump housing without
disconnecting suction and discharge pipes.
See chapters 4.0 Disassembly/Assembly and
section 6.6 Weights.
3.21.5 Back pull-out
To flush the pump or to check the sleeve
bearing for wear the bearing bracket with
intermediate casing, shaft and rotor can
be easily pulled out backwards without
disconnecting the suction and discharge
pipes. When a spacer coupling is used, the
driving mechanism need not be moved.
See chapters 4.0 Disassembly/Assembly and
section 6.6 Weights.
3.21.6 Clearance adjustment
The TG-pumps are delivered with the correct axial clearance setting. In some cases, however,
the axial clearance needs to be adjusted:
• When uniform rotor and idler wear need to be compensated.
• When the flow is too low pumping low viscous liquids and the
slip has to be reduced.
• When the liquid is more viscous than expected, the friction
inside the pump can be reduced by increasing the axial
clearance.
Proceed as follows to set the axial clearance:
Nominal axial clearance
TG H pump size
(s
ax
) [mm]
2-32 – 6-40 0.10 – 0.15
15-50 – 23-65 0.10 – 0.20
58-80 – 86-100 0.15 – 0.25
185-125 – 360-150 0.20 – 0.40