Usage And Inspection; Preventative Maintenance - Manitowoc Grove RT765E-2 Service And Maintenance Manual

RT765E-2 SERVICE MANUAL
Table 5-1
Reading
Oil is not visible in the sight glass.
Oil is visible in the sight glass and the
level is no more than 1/8 in (3 mm)
from the top of the sight glass.
Oil level is more than 1/8 in (3 mm)
from the top of the sight glass or the
oil is escaping from the vent plug (4).
Compare your reading with (Table 5-1) and take the required
action.
1
2

Usage and Inspection

Inspection procedures for hoists are divided into five general
categories based upon their usage or duty cycle, which in
turn determines appropriate intervals for inspections. The
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.
GROVE
Diagnosis
The hoist is under
filled.
The oil level is
correct.
The hoist is overfilled.
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.
4
The following chart lists the inspections that are required for
each type of usage category.
3
FIGURE 5-3

Preventative Maintenance

It is extremely important to be aware of the possibility that
deterioration of internal critical components within the hoist
reduction unit can occur. Hoist reduction units incorporate
planetary gears, multi-disc brake assemblies, and sprag
clutches which do not have an infinite life span. Although
these components have been designed to achieve long
service life, reliability can be substantially reduced by a
variety of influencing factors such as:
•
•
Published 9-04-2014, Control # 422-08
HOIST AND COUNTERWEIGHT
Action Required
Fill the hoist with oil from the upper access hole until the
oil level rises within the sight glass. Do not fill above 1/8 in
(3 mm) from the top of the site glass.
Refer to Hoist, page 9-26 for the correct type of oil.
No action is required.
Drain the hoist drum from the upper access hole until the
oil level falls to within 1/8 in (3 mm) from the top of the
sight glass.
High cycle operation.
Operating in high ambient temperatures.
5
5-5