20150127_094508 (1)Even the best products will fail without proper maintenance,  and we pride ourselves on maintaining your equipment better than anyone else in the industry.  We hire only qualified technicians with years of experience and we give them the tools that they need not only to inspect your cranes, but to fix them quickly and properly.  Our techs are taught to not just be parts replacers but to get to the bottom of why a component fails.  We have implemented a 5 why system in order to get to the root cause of  chronic issues with overhead cranes.  A couple of examples that we have used in the past are:

EXAMPLE 1, Hoist Motor Failure Due To Poor Power

Why 1: Motor Windings Overheated

Why 2: Motor not getting proper power – this was determined by motor rewind technician.

Why 3: Motor Contactor points pitted excesively

Why 4:Contactor Chattering due to poor incoming power from buss bars

Why 5: Buss bars pitted due to frost build up on bars

Solution: Refurbish hoist motor, replace hoist contactors, honed down pitted section of buss bar and installed dual collectors with cleaning shoes to clear bar of frost.

What had been done by a previous crane company: Hoist motor had failed several times due to winding failure in the past, always when the customer was most busy.  The previous service company had told the customer that they were using their crane too much and recommended installing a second crane on the same runway.

EXAMPLE 2: Hoist Motor Failure Due To Overuse

Why 1: Motor Windings Overheated

Why 2: Motor being used excessively in slow speed – this was determined by motor rewind technician.

Why 3: Hoist was not properly specced when purchased from another crane company so it could not handle the heat build up in low speed.

Why 4: Winding insulation too low of a grade and slow speed cooling lacking

Why 5: Electric motors normally provide only 1/6 – 1/4 as much cooling in low speed, even thought the produce almost as much heat in low speed as in high.

Solution: An upgrade to class H insulation in the motor allowed it to handle 30°C more heat, and a blower fan was installed that provides constant cooling to the motor in low and high speeds.

As you can see the same problems often require a different approach, in both cases it was imperative to have the motor rewind technician diagnose what had gone wrong with the motor so that an effective solution could be devised; a step that is all to often neglected by many service companies.  In both cases the focus was to fix it for the long term and in both cases there has been no further failures.

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