Hawk Industries Hawkjaw Sr. Manual ALS Serial Numbers 1 to 100 - Manual (Page 81)

Trouble Shooting
Trouble
Shooting
Troubleshooting 81
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
Check that no hissing sound comes from the Grip
air button or the selector switch. 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. 130,132,128.
z
Check that the Grip 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 Spin button air valve. See
Drawings, p. 130.
z
Check that the Selector Switch is working. See pg.79.
z
Make sure the hydraulic power unit is shut down.
Press the Grip button repeatedly to bleed hydraulic
pressure. Access the main hydraulic block. See
Maintenance & Repair, p. 66, Drawings, p. 114, 128.
With the selector switch on make, push in the Grip
button. Check that air reaches the Grip hydraulic
valves VG3 (Gray hose) and VG2 (Green hose) and
does not reach VG1 (Black hose). With the selector
switch on break, check that air reaches the Grip
hydraulic valves VG2 (Green hose) and VG1
(Black hose) and does not reach VG3 (Gray hose).
Disconnect the Grip valve air hoses one at a time.
To disconnect the air hose, push the hose and collet
ring into the valve pilot port. While holding down
the collet ring, pull out the air hose. Place your hand
over the disconnected air hose, and push in the Grip
air button. If any of these tests fail, replace the air
logic system. See Drawings, p.126. If the air
signals are correct, replace the faulty Grip hydraulic
valve VG1, VG2 or VG3. See Drawings, p. 114,
128.
In make mode, the Grip button
is pushed in. The HawkJaw
does not do the following:
1. Top wrench grips pipe.
2. Middle wrench grips pipe.
In break mode, the HawkJaw
does not do the following:
1. Middle wrench grips pipe.
2. Bottom wrench grips pipe.
(cont.)
Symptom Remedy
Grip Button
(cont)
Continued on next page.