Lifting Capacity Of The Excavator; Constructive Calculation Of Lifting Capacity; Lifting Attachment - Kubota U50-5 Operating Instructions Manual

Lifting capacity of the excavator

LIFTING CAPACITY OF THE EXCAVATOR

Constructive calculation of lifting capacity

The lifting capacity of the excavator is based on ISO 10567 and does not exceed 75 % of the static tipping

load or 87 % of the hydraulic lifting capacity of the machine.
The lifting capacity is measured at the front pin part of the arm with the arm fully extended. The arm is fully in

the dump position. The boom cylinder is the operating cylinder.
The lifting conditions are:

1. Swivel up to 360°, dozer up and
down
2. Over front end, dozer down
3. Over front end, dozer up
As well as the lifting conditions, the length of the arm also affects the permitted lifting capacities and the sta-

bility of the machine. Compare the dimensions of the machine arm with the details given in the lifting capacity
tables, in order to use the correct lifting capacity table for your machine.
Dimensions for the arm, see table "Design of arm" in the section "Dimensions" (page 44).

Lifting attachment

The lifting operation is only permitted when the excavator is equipped with the following safety systems as

per EN 474- 5:
– Pipe safety valve on the boom cylinder (page 32)
– Pipe safety valve on the arm cylinder (page 32)
– Overload warning system (page 33)
If the dozer is being used to increase the machine's stability, an additional pipe safety valve must be installed

in accordance with EN 474-1 (page 33).
The lifting attachment is to be fastened to the attachment or to other parts of the excavator in such a manner

as to exclude the possibility of the lifting rope accidentally unhooking.
The installation on the attachment or the equipment must be such as to guarantee the optimum field of vision

between the operator and the guide [the person who fastens the lifting rope to the lifting attachment].
The lifting attachment is to be positioned so that the lifting rope is not deflected from its vertical direction of

tension by other parts of the machine.
The lifting attachment must be formed and positioned in such a manner as to exclude the possibility of the

lifting rope accidentally slipping.
Care must be taken when positioning the lifting attachment that there is no risk of restriction (e.g. becoming

caught on something) during normal operation of the excavator or when working on any particular object.
W9272-8135-1
05/2020
The position of the dozer is not relevant to the maxi-
mum lifting capacity when swivelling up to 360°.
The illustration on the label is representative of both
states: Dozer up and down.
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