Specifications

Guide roller
Measure with sliding caliper.
Dimensions New roller Worn-out roller
(mm) (mm)
A Ø 74 minimum Ø 68
(Ø 2.91 in.) (min. Ø 2.68 in.)
B minimum 2
(min. .08 in.)
Guide rollers for mast tube dia. 76 mm are zinc plated (yellow roller face).
Guide rollers for mast tube dia. 60 mm are iron-zinc plated (black roller face).
Note that the ”wear” on the roller face must be equal – ALL
around.
Mast tubes
Checking of wear and corrosion on mast sections is carried out
by means of an Alimak ultrasonic tester Part No. 3002546-000.
The bottom mast section must be thoroughly checked.
650 x 650 square mast section with tube dia. 76 mm (3 in.)
New mast tubes Max. worn out mast tubes
t mm (inches) t mm (inches)
4.2 (.165 in.) 3.1 (.122 in.)
6.3 (.248 in.) 4.7 (.185 in.)
8.0 (.315 in.) 6.0 (.236 in.)
approx. 25% reduction of wall thickness
450 x 450 square mast section with tube dia. 60 mm (2 3/4 in.)
New mast tubes Max. worn-out mast tubes
t mm (inches) t mm (inches)
3.6 (.141 in.) 2.7 (.106 in.)
3.2 (.126 in.) 2.4 (.095 in.)
approx. 25% reduction of wall thickness
Note that wear/corrosion on the mast sections have an effect on
maximum overhang (free top) and maximum allowed mast
height as follows:
Reduction of original Reduction of overhang Reduction of mast
wall thickness in % of the hoist mast in % height in %
10% 15% 20%
15% 20% 30%
20% 20% 40%
25% 25% 50%
more than 25% Mast section should be scrapped
ALIMAK 34620 - 1 /08
E 11
e 11
A
B
e 52