Hawk Industries Hawkjaw Sr. Manual ALS Serial Numbers 1 to 100 - Manual (Page 74)

Trouble Shooting
74 Troubleshooting
Symptom Remedy
RaiseButton/
Lower Button
(cont)
z
Properly connect the air hoses within the Right
control handle. See Drawings, p. 132, 128.
z
Make sure the "E" stop is pulled out.
z
If the Grip button is pushed in, the HawkJaw will
not raise or lower. This feature is for safety. Make
sure the Grip button is not pushed in.
z
Check to make sure the hydraulic power unit is
producing 2500 psi at 20-35 gpm.
z
Check that the HawkJaw is getting at least 100 psi
air.
z
Check that the pump pressure compensator setting
is at 2500 psi.
z
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.
z
Make sure the Raise/Lower Quick Disconnects are
tightened with wrenches. If the Quick Disconnects
are not securely tightened, no fluid will flow to the
Raise/Lower cylinder. See Installation, p. 13.
z
Check that no hissing sound comes from the Raise
or Lower button. An air hose is broken, switched or
disconnected if there is a hissing sound. Locate the
leak, and replace the hose or connect the hose
properly. See Drawings, p. 132, 128.
z
Make sure the hydraulic power unit is shut down.
Press the Grip button repeatedly to bleed hydraulic
pressure. 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
Lower button air valve. See Drawings, p. 132.
A loud hissing sound comes
from the Raise or Lower button.
Push in the Raise button or the
Lower button, and nothing
happens.
Continued on next page.