30 | MDP Operation & Maintenance Manual
Symptom Cause Remedy
Jaw Speed wont shift when the jaws
are partially opened.
Back pressure is too high in the base
machine return line.
Use higher diameter hydraulic lines
to minimize back pressure. Move
the main spool adjustment screw
clockwise in small increments until
the issue is corrected (see “Adjusting
the Speed Valve” on page 23).
Jaws continue to close after the
operator has let go of the controls,
after moving in speed mode.
The main valve spool isn’t fully
shifting out of speed mode.
Move the main spool adjustment
screw clockwise,in small increments,
until the issue is corrected (see
“Adjusting the Speed Valve” on page
23).
The jaws lack power.
The main valve spool isn’t fully
shifting out of speed mode.
Move the main spool adjustment
screw counter clockwise,in small
increments, until the issue is
corrected (see “Adjusting the Speed
Valve” on page 23).
Base machine pressure is too low or
is in hammer mode.
Check the base machine.
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