Manitowoc Grove GRT8100 Service Manual

5-6
Published 3/26/2018, Control # 596-05
HOIST AND COUNTERWEIGHT GRT8100 SERVICE MANUAL
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
Lubrication, page 9-1 and/or manufacturers instructions.
1. Pre-Use or Daily Inspection.
Must include but is not limited to the following inspections
that will be performed prior to placing the crane into service
and then as necessary during extended operation. This
inspection must be performed by a qualified crane operator
or qualified crane technician.
• Check for external oil leaks and repair as necessary.
This is extremely important due to accelerated wear
from insufficient lubricating oil in the hoist. Hoists with a
sight glass; check oil level daily. Hoists without a sight
glass; check oil level monthly if no external oil leaks are
detected. Lubricant level must be maintained between
the minimum and maximum levels; midway up sight
glass or at bottom of level plug port as equipped. Use
ONLY the recommended type of lubricant. Refer to
Lubrication, page 9-1.
• Check hydraulic fittings and hoses for chaffing,
deterioration or corrosion and repair as necessary.
• Visually inspect for corroded, loose or missing bolts, pins
or other fasteners and replace or tighten as necessary.
• Visually inspect rotation indicator transmitters, anti-two-
blocking switches and other safety equipment and repair
as necessary.
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.
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.

Manitowoc Grove GRT8100 Specifications

General

Brand	Manitowoc
Model	Grove GRT8100
Category	Construction Equipment
Language	English