Grove
Published 01-14-2021 Control # 707-01
4-5
TMS9000-2 SERVICE MANUAL
SUPERSTRUCTURE
4
A comprehensive hoist line pull and load holding test must
be carried out following any such repair work.
Manitowoc Crane Care offers prepackaged kits that include
all seals, bearings, fasteners, washers, brake disks, brake
stators, and springs required for reassembling hoist after
inspection. If components not included in the kit are found to
be worn or damaged, contact your Manitowoc Cranes
distributor or Manitowoc Crane Care to order a replacement.
Usage and Inspection
Inspection procedures for hoists are divided into five general
categories based on usage or duty cycle which determines
appropriate intervals for inspections. Usage categories must
be assigned by the crane user on a consistent crane-by-
crane basis. The five crane/hoist usage categories are as
follows:
Idled
- The crane/hoist has not been used for three months.
Infrequent Usage
- The crane/hoist is used less than ten
hours per month based on a three month average
Moderate Usage
- Crane/hoist used 10 - 50 hours per
month based on a three month average.
Heavy Usage
- Crane/hoist used 50 - 200 hours per month.
Severe Usage
- Crane/hoist is operated more than 200
hours per month OR where 50% of the lifts exceed 75% of
the rated capacity for the hoist.
The following chart lists inspections required for each type of
usage category.
Preventative Maintenance
It is extremely important to be aware of deterioration of
internal critical components within the hoist reduction unit.
Hoist reduction units contain planetary gears, and multi-disc
brake assemblies, which do not have an infinite life span.
Although these components are designed for long service
life, reliability can be reduced by a variety of factors such as:
•
High cycle operation.
•
Operating in high ambient temperatures.
•
High external contaminations, such as dusty or sandy
conditions.
•
Level of maintenance.
The following should be carried out following instructions in
, page 9-1 and/or manufacturers instructions.
1.
Pre-Use or Daily Inspection, refer to the Operator
Manual.
2.
Quarterly Inspection (every three months).
Must include but is not limited to the following inspections
that must be performed by a qualified crane operator or
qualified crane technician.
•
Perform pre-use inspection.
•
Inspect for corrosion of fasteners, hoist base, drum, etc.
and repair/replace as required to maintain structural
integrity of the hoist.
•
Check hoist oil level. Inspect hoist gearbox for oil leaks.
3.
Every 250 hours or 3 months.
•
If applicable, lubricate cable guide roller and cable guard
roller bearings.
4.
Semi-Annual Inspections (every six months).
Must include but is not limited to the following inspections
that must be performed by a qualified crane operator or
qualified crane technician.
•
Perform Pre-Use and Quarterly inspections.
•
Take a sample of lubricant from hoist gear cavity as
described in
Gear Oil Sampling and Analysis
and analyze it for wear metals content, correct viscosity,
l u b r i c a n t d e t e r i o r a t i o n , m o i s t u r e a n d o t h e r
contaminants. If oil sample contains a high amount of
PRE-USE
DAILY
INSPECTION
QUARTERLY
INSPECTION
SEMI-ANNUAL
INSPECTION
ANNUAL
INSPECTION
IDLED
Not used for 3
months or longer
REQUIRED
BEFORE
PLACED IN
SERVICE
REQUIRED
BEFORE
PLACED IN
SERVICE
REQUIRED
BEFORE
PLACED IN
SERVICE
N/A
INFREQUENT
USAGE
Less than 10
hours per month
REQUIRED
REQUIRED
REQUIRED
REQUIRED
MODERATE
USAGE
10-50 hours per
month
REQUIRED
REQUIRED
REQUIRED
REQUIRED
HEAVY USAGE
50-200 hours
per month
REQUIRED
REQUIRED
MONTHLY
REQUIRED
QUARTERLY
(3 MONTHS)
REQUIRED
SEMI-ANNUALLY
(6 MONTHS)
SEVERE USAGE
200+ hours per
month or 50% of
lifts exceed 75%
rated capacity
REQUIRED
REQUIRED
REQUIRED
QUARTERLY
(3 MONTHS)
REQUIRED
SEMI-ANNUALLY
(6 MONTHS)
DANGER
Failure to implement and adhere to a hoist inspection and
maintenance program may result in damage to the crane,
other property damage, and/or serious injury or death to
persons working on or near the crane.
Fo
r
Reference
Only
