M&C TechGroup SR25.1_Ex Operator's manual - Manual (Page 15)

3-7.1-ME Gas sampling and gas conditioning technology 15
 Take away conveying belt 
and remove the old hose set

from the guides by the hose
connectors;
 Press the two contact pulleys 
and check whether the spring pressure is still sufficient, if not,
the contact springs have to be changed see (14.2);
 Put the new hose set 
with the hose connectors into the guides of the conveying belt

;
N O T E !
Only the usage of the original hose set guarantees a perfect function.
Never lubricate the hose.
Before mounting the pump check all parts for impurity and clean if
necessary.
 Put the conveying belt 
with the new hose

into the dovetail guide of the pump body;
 Press conveying belt at the recessed grips and simultaneously turn the S-bolt 
anticlockwise
until it snaps;

Switch on pump.
14.2 CHANGE OF CONTACT PULLEYS AND SPRINGS
 Switch off the mains;
 Unscrew nuts of the pump head (wrench size 5,5)  and remove snap ring  from motor
shaft;
Figure 7 Disassembly of pump head and driver
 Draw the pump head  out of the motor shaft
 Take driver out of the pump head
 The removal of the springs (4 pcs.) away from the driver is easily possible without the aid of
any tools. For this take spring out of the groove  near to the shaft bore.
 Dismount roller axes and change contact pulleys. Take care that axes are not worn out by the
springs and have damaged the dent at the axes front end. In case of abrasion the axes have to
be changed (see Figure 9).