Hawk Industries Hawkjaw Jr. Manual 65K-ALS Serial Numbers 4 to 9 - Manual (Page 72)

Trouble Shooting
Symptom Remedy
l
Make sure the hydraulic power unit is shut down.
Check to see that the Green air hose goes to Port B
and the Black air hose to Port A on the Raise/
Lower hydraulic valve. See Drawings, p. 108.
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If all other air and hydraulic hoses are properly
connected, the air hoses are switched in the Left
control handle. Properly connect the Raise and
Lower air hoses in the Left control handle. See
Drawings, p. 110.
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Properly connect the air hoses within the Left
control handle. See Drawings, p. 110.
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If a Grip button is pushed in, the HawkJaw will not
raise or lower. This feature is for safety. Make
sure all Grip buttons are pulled out.
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Check to make sure the hydraulic power unit is
producing 2600 psi at 20-35 gpm.
l
Check that the HawkJaw is getting at least 100 psi
air.
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Check that the pump pressure compensator
setting is at 2600 psi.
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Check that the hydraulic filter element is not
completely full of contaminants. If the red indicator
button on the hydraulic filter body pops up, change
the filter element. See Filter Maintenance, p. 35.
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Check that no hissing sound comes from the Raise
or Lower button. An air hose is broken or
disconnected if there is a hissing sound. Locate
the leak, and replace the hose. See Drawings, p.
110.
l
Check that the Raise or Lower button air valve
works. Push in the button. Air should sound like it
is being sharply inhaled. Release the button. Air
should sound like it is being sharply exhaled. If
these sounds do not occur, replace the Raise or
Push in the Raise button or the
Lower button, and the
HawkJaw moves opposite the
desired direction. (cont.)
A loud hissing sound comes
from the Raise or Lower button.
Push in the Raise button or the
Lower button, and nothing
happens.
Raise Button
Lower Button
72 Troubleshooting
Continued on next page.