15
Tear down inspections of BRADEN hoists should be
completed per the usage schedule defined below.
Magnetic Particle Inspection (MPI) of the internal ring
gear and reduction gears must be performed during
tear down inspections to aid in the detection of cracks in
the ring gears due to fatigue. The preferred inspection
method is the Fluorescent Wet Magnetic Particle
Inspection using ultraviolet light consistent with ASTM
E709. For further information related to this inspection,
and for testing of the older CH150 ring gears, P/N
24446, refer to BRADEN Service Bulletin LIT2162.
Severe Duty
- Perform tear down inspection / MPI
annually
Heavy Usage
- Perform tear down inspection / MPI
at least every (3) years
Moderate Usage
- Perform tear down inspection /
MPI at least every (4) years
Infrequent Usage
- Perform tear down inspection /
MPI at least every (5) years
It is also strongly recommended that any moderate or
infrequent usage hoist that is also used for personnel
lifting undergo tear down inspections on a maximum
basis of once every (3) years.
Any hoist that has NOT been subject to regular oil
sample analysis must undergo a tear down inspec-
tion on an annual (12 month) basis.
Also, if a hoist
has an unknown history of repair and/or maintenance, it
is highly recommended that the hoist undergo a tear
down inspection prior to being placed into service.
NOTE: Oil analysis alone cannot detect nor warn
against component fatigue failure.
A tear down inspection includes the hoist being com-
pletely disassembled, cleaned, inspected and repaired
as required. Replacement of all worn, cracked, corrod-
ed or distorted parts, such as pins, bearings, shafts,
gears, brake rotors, brake plates, drum and base
should occur as required. All seals and O-rings should
be replaced at this time.
Any deficiencies including, but not limited to, those
above, shall be corrected immediately.
All of the following operations MUST be performed
BEFORE
the hoist is placed back into service.
1. The rebuilt hoist MUST be line pull tested to the
rated load of the hoist (hoist rating will vary with
motor, gear ratio and drum options) with a
dynamometer or equivalent load measuring device.
This test load shall be the maximum rating of the
hoist for the specific application (at the normal relief
valve setting for the hoist) -
NOT
the reduced rating
used for personnel lifts.
2. The hoist must be dynamically tested by rotating the
drum several times, in both the hoisting and lower-
ing directions, while under a load of at least 30% of
the hoist lifting capacity. Check for smooth operation
during this procedure.
3. The hoist internal friction brake shall be tested per
the procedures on page 18 of this manual.
4. If equipped with an auxiliary drum brake, the auxil-
iary brake shall be tested as defined on page 19 of
this manual.
5. After inspection or rebuild and testing, a new certifi-
cate for personnel handling shall be issued by the
inspector / service technician, effective on the date
the hoist is placed back in service. A sample certifi-
cate is shown below, and shall include, at a mini-
mum, all of the information depicted here.
TEAR DOWN INSPECTION
Name of Service Company
Approved by BRADEN for handling personnel
if used and maintained in accordance with BRADEN
Recommendations For Personnel Handling Hoists
Hoist Model No.:
_______________________________
Hoist Serial No.:
_______________________________
Date of Inspection: _______________________________
Work Order/Job No:_______________________________
Inspector’s Name: _______________________________
For a copy of recommendations call or write: BRADEN
PO Box 547, Broken Arrow, OK, 74012, USA (918) 251-8511
