Front Pull-Out; Back Pull-Out; Clearance Adjustment - Johnson Pump TG GS2-25 Instruction Manual

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:
1. Loosen the set screws (1480).
2. Tighten the bolts (1540).
3. The pump shaft with roller bearing and
rotor will be pushed against the pump
cover. The axial clearance is then zero.
4. Install a gauge on the bearing bracket.
5. Position the feeler gauge against the shaft end and initialise the gauge.
6. Loosen the bolts (1540) and tighten the set screws (1480) thus pushing rotor and roller bearing
backwards.
7. Tighten the set screws until the distance between shaft end and bearing bracket has been
increased by the required clearance.
8. Lock the shaft again by tightening the bolts (1540). The set clearance may be changed again.
Therefore, when pushing the shaft end backwards, the clearance should be enlarged by 0.02
mm.
A.0500.501 – IM-TGGS/05.01 EN (03/2013)
Nominal axial clearance
TG GS pump size (s ) [mm]
ax
2-25 to 6-40 0.10 – 0.15
15-50 to 23-65 0.10 – 0.20
58-80 to 86-100 0.15 – 0.25
185-125 0.20 – 0.40
1480
1540
1530
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