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The function of a reaction device is to hold the tool in position against the forces generated to
tighten or loosen bolts or nuts. Hydraulic wrenches generate tremendous force.
SETTING THE REACTION ARM
An improperly
positioned reaction
arm may result in
operator injury
or damage to tooling.
REACTION
CONTACT
POINTS
REACTION
CONTACT
POINTS
REACTION
CONTACT
POINTS
REACTION
CONTACT
POINTS
Square Drive Hydraulic Wrench Reaction Points (Dwg.01)
Make sure the reaction arm is positioned correctly.
(Refer to Dwg. 01).
The reaction arm can be positioned numerous
places within a 360
O
circle. However, for the arm to
be correctly positioned, it must be set within a 90
O
quadrant of that circle. That quadrant is the area
located between the protruding square drive and
at the bottom of the housing away from the swivel
inlets. It will always be toward the lower half of the
housing and on one side of the housing when
tightening and on the other side when loosening.
(Dwg. 01)
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