Combustion Engines; Shaft Coupling; Guarding Of Moving Parts - Johnson Pump TG GS2-25 Instruction Manual

Electrical equipment, terminals and
components of control systems may
still carry live current when at rest.
Contact with these may be fatal,
resulting in serious injury or cause
irreparable material damage.
Line
U (volt)
3 x 230 V
3 x 400 V

3.18.9.5 Combustion engines

When using a combustion engine in the pump unit, see the engine instruction manual included in the
delivery. Contact the pump supplier if the manual is not included.
Irrespective of this manual the following must be respected for all combustion engines:
• Compliance with local safety regulations
• The exhaust of combustion gases must be screened to avoid contact
• The starter must be uncoupled automatically once the engine has started
• The pre-set maximum number of engine revolutions may not be modified
• Before starting the engine, the oil level must be checked
Note!
• Never run the engine in a closed area
• Never refuel the engine while it is still running

3.18.9.6 Shaft coupling

Internal gear pumps demand a relatively high starting torque. During the operation shock loads are
occurring due to pulsations inherent to the gear pump principle. Therefore, choose a coupling which
is 1.5 times the torque recommended for normal constant load.
Alignment
The pump and motor shafts of complete units are accurately pre-aligned in the factory.
After installation of the pump unit, the pump and motor shaft alignment must be checked and
re-aligned if necessary.
Belt drive
Belt drives also increase the loading on the shaft end and the bearings. Therefore,
certain limitations must be imposed on the maximum load of the shaft, viscosity, pumping pressure
and speed.

3.18.9.7 Guarding of moving parts

Before commissioning the pump, place a protective guard over the coupling or belt drive. This guard
must comply with the EN 953 design and construction standard.
For pumps operating at temperatures above 100°C, ensure that bearing bracket and bearings are
cooled sufficiently by the surrounding air. Openings in the bearing bracket must not be guarded
if the rotating parts do not have any projections (keys or keyways) which could cause injury (see
prEN809). This simplifies the inspection and maintenance of the shaft seal.
36
Motor
230/400 V 400 V
delta –
star delta
U
L1
L1
L2
L2
L3 L3
N
N
U 1 V 1 W 1
delta star
W 2 U 2 V 2
A.0500.501 – IM-TGGS/05.01 EN (03/2013)
U
U 1 V 1 W 1
W 2 U 2 V 2