HUMMEL
®
01.01.2019
English / Englisch
7.7 REPLACEMENT OF TENSIONING ROLLER
Use exclusively original LÄGLER
®
tensioning rollers (part number
in
Section 11, Spare parts HUMMEL
®
)!
1
Remove the drive unit (
Section 7.1.2, Dismantling and
cleaning of drive unit
).
2
Clamp the drive unit in a vise. If you are unable to reach the
lock nuts with the closed-mouth wrench, screw the lever into
the crank again and turn it downwards (fig. 90, 1) so that the
top of the drive unit is lifted up.
3
Remove the two fixing screws in the tensioning roller while
holding onto the locknuts with a closed-mouth wrench
(fig. 90, 2).
4
Remove the tensioning roller and check the compression
spring. Should this be deformed, the compression spring
(part number in
Section 11, Spare parts HUMMEL
®
) must be
renewed.
5
Clean the drive unit.
Do not use any cleaning products which
contain solvents!
6
Insert the compression spring and the tensioning roller.
Ensure that the surfaces on the shaft ends of the tensioning
roller are pointing upwards (fig. 91)!
7
Tighten the screw of the unsprung bearing pedestal side
(fig. 92, 1).
8
Turn the screw on the sprung side of the tensioning roller
(fig. 92, 2) far enough so that the tensioning roller is positioned
parallel to the upper part of the drive unit (fig. 93).
9
Tighten the lock nuts of the fixing screws!
MAINTENANCE WORK AND REPLACEMENT OF WEARING PARTS
Fig. 92
Tighten the side without spring (1) and then the
side with spring (2), so that …
Fig. 93
… the tensioning roller is positioned parallel to
the top of the drive unit.
7
Fig. 91
Insert the new tensioning roller, ensuring that the
surfaces on the shaft ends are pointing upwards!
Fig. 90
Turn the crank in the indicated direction (1).
Remove the two fixing screws in the tensioning
roller while holding onto the locknuts with a
closed mouth wrench (2).
48
