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SECTION I
INTRODUCTION
INTRODUCTION
This instruction manual has operation and maintenance information for DuraClass
Model 1715, 1721, 1821 and 1824 HD single-acting and 1715 DA, 1721 DA, 1821
DA and 1824 DA-HD double-acting, twin-arm type hydraulic hoists.
It's been prepared to acquaint you with the design features of the unit, and to instruct
you in its proper operation and maintenance.
Read this manual carefully before you operate or service one of the arm type hoists.
Remember that you're working with heavy equipment that can injure you or some-
one else. You can lessen the chance of injury by following the procedures in this
manual, carefully.
All Operator/Service people should review it carefully and become familiar with the
contents. This manual is to be retained in the glove box of the vehicle equipped with
this hoist for future reference for Operator and Maintenance Personnel. If anyone
else besides yourself operates or services this equipment, make sure they read this
manual and are instructed with all the safety procedures related to this equipment.
HOIST DESCRIPTION
DuraClass Model 1715, 1721, 1821 and 1824 HD hoists are single-acting, single
cylinder, twin-arm type hydraulic hoists (see Figure 1) whereas the Model 1715
DA, 1721 DA, 1821 DA and 1824 DA-HD hoists are double-acting, single cylin-
der, twin-arm type hydraulic hoists (see Figure 2). These hoists are designed for
use with DuraClass steel dump bodies on single or tandem axled chassis. Dumping
angle is 50 ° for all hoist models.
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