Disassembly And Assembly; Special Tools; Precautionary Measures; Switch Off The Power Supply - Johnson Pump MCHZ Instruction Manual

MCHZ

7 Disassembly and assembly

7.1
7.2
7.2.1
7.2.2
7.2.3
MCHZ/EN (0912) 4.2

Special tools

Assembly and disassembly work requires no special tools. However, such tools can
make certain jobs easier, for instance replacing the shaft seal. If such is the case it will be
indicated in the text.

Precautionary measures

Before the pump can be repaired it must first be dismantled. The following measures are
required for this:

Switch off the power supply

1 Switch off the power supply to the pump by placing the pump switch on the control
box to the "OFF" position, or if an operating switch is fitted by turning this "OFF".
2 Remove the fuses.
3 Fit a warning board onto the control box.

Pipe support

If the entire pump has to be removed check that the pipes are supported. If this is not the
case, then ensure sufficient support and fixing points for the pipes first.

Draining the liquid

If the liquid being pumped is hot, then allow the pump to cool down further
before proceeding. Make sure you do not come into contact with the
pumped liquid if this is hot or of an unknown composition!
1 Close any relevant stop cocks.
2 Drain the pump until no more liquid flows out.
An MCHZ(S) pump can not be drained fully in the horizontal position. If
possible place the pump vertically on the bearing cover and allow it to drain
further.
Disassembly and assembly 27