MHP Operating & Maintenance Manual
25
TROUBLESHOOTING
SYMPTOM
CAUSE
REMEDY
MHP jaws will not move, move too
fast or move too slow.
Check speed valve operation
Adjust if necessary (see “Adjusting
MHP cannot process or hold
material in the jaws.
The material is too big.
Consult the factory.
Speed valve needs adjustment.
See “Adjusting the Speed Valve”
Back pressure is too high.
Check all hydraulic lines and
ensure they are not kinked and
are of the proper size. Check the
base machine circuit for restrictor
valves.
The jaws don’t shift speed when
closing.
Pilot valve pressure is too high.
Adjust the pilot valve adjustment
counter clockwise in small
increments until issue is corrected
(see “Adjusting the Speed Valve”
Jaw speed wont shift when the
jaws are partially opened.
Back pressure is too high in the
base machine return line.
Use larger 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
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
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
FIRST STEPS
•
• Inspect all hydraulic lines for kinks or damage. Replace any damaged hydraulic lines.
