METAL BODY REPAIR - OD1653 - LESSON 1/TASK 1
(22) To correct collision damage in a motor vehicle, it requires a strong
force opposite to the direction of the impact. Powerful portable jacks have
been developed to replace crowbars, planks and other makeshifts that were
used for years to force damaged frames and bodies back into shape. The
portable hydraulic jack shown in figure 24 is capable of exerting a 10 ton
force. It consists simply of a hydraulic cylinder connected to a hand pump
through a hose. It is provided with attachments for pushing, pulling,
bending, clamping, or spreading, which can be used singly or in
FIGURE 24. PORTABLE HYDRAULIC JACK.
Before using the jack, size up the job to determine the direction of the
damaging force. If the frame has been twisted, align this first, removing
the body if necessary. Make a setup using the ram and its attachments to
apply hydraulic force, reversing the force of the damaging impact.
To operate the jack, insert the handle into the pump beam either
horizontally or vertically. Close the release valve, turning it by hand as
far as possible to the right. The downstroke of the
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