Auszug der 83. Ausgabe, 16. Jahrgang April/Mai 2012 Das internationale Fachmagazin für Kranund Hebetechnik
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Das internationale Fachmagazin für Kranund Hebetechnik
Reprint:
MK 80 vs. MK 88:
Manual versus
Automatic
KM Nr. 83 | 2012 Kranmagazin
In Aktion
MK 80 vs. MK 88:
Manual versus Automatic
With the MK 80 a hydraulic cylinder plays a key role in the erection process.
Result: The procedure takes longer, the undercarriage engine has to run during setup.
Intermat 2000: With the MK 80, Liebherr presented the first MK product developed on an AT chassis. Nine years later, also at the Paris trade fair, the company presented a completely newly developed successor – the MK 88. The KM editorial team wanted to know what distinguishes the two 4-axle cranes.
“MK 80 vs. MK 88” – this was the mission that brought KRANMAGAZIN to KappelGrafenhausen in the state of Baden-Württemberg in Germany, where MSG Krandienst GmbH has a branch office.
“We obtained our first MK about four years ago” explains Björn Jatz from MSG. “We
The MK 80 only has a 30° jib luffed jib position angle.
started out with an MK 63, |
ber 2011. In October 2010, |
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which we were able to hire |
MSG Krandienst GmbH also |
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out very well right from the |
invested in a second-hand |
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outset. But we soon discov- |
MK 80. The crane, which was |
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ered that this crane was too |
manufactured in |
2002, |
was |
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small for our requirements.” |
only intended to remain in |
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Therefore, in May 2010 |
the MSG fleet |
temporarily |
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the company put its first |
but, like the two new MK 88s, |
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MK 88 into service, followed |
it was extremely popular with |
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by a second one in Novem- |
MSG’s customers, and so, the |
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company still hires it |
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out. |
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This |
gave |
KM |
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the |
opportunity to |
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see |
the |
two mobile |
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Two convinced MK drivers: Martin Hartmann (left) and Felix Bildstein.
Kranmagazin KM Nr. 83 | 2012
In Aktion
Within the scope of a test drive and with the assistance of the two drivers KM wanted to literally “experience” the conceptual differences between the two AT undercarriages.
But before the test starts, the different tyres on the cranes catch our eye. While the MK 88 has 14.00 R 25 tyres, the MK 80 has to make do with 445/65 R 22.5. This is quite a significant factor, since due to the design, the MK undercarriage – like all AT construction cranes – is very low.
As we all know, the challenge for mobile cranes is to reconcile two opposing requirements. On the one hand, naturally the crane should have a large radius and must, therefore, be equipped with a suitably large jib. On the other hand, for road transport, in other words, when it is collapsed, it must not exceed the 4-m width limit.
And although such a situation didn’t occur during the 90-minute test drive, during which both operators drove
With the MK 88 the erection process is done via cables.
the two cranes alternately through the Rhine Valley and the undulating foothills of the Black Forest, both drivers pointed out that the low design of the construction cranes on an AT undercarriage required a certain touch in case of depressions in the road surface or when driving into uneven building sites. “With the MK 80 more than the MK 88 because it has the smaller tyres,” the two drivers agreed.
During our test drive the MK 88 was well ahead of the MK 80 on hills.
We find another difference when take a look in the undercarriage cab: MK 80 with clutch pedal, MK 88 without. While the MK 88 uses the automatic 12-gear transmission ZF AS Tronic, the MK 80 is equipped with ZF Ecosplit transmission (16 forward gears). Although gear selec-
KM Nr. 83 | 2012 Kranmagazin
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